201771010113 李婷华 《面向对象程序设计（java）》

package calculator;

import java.awt.*;
import javax.swing.*;

/**
 * @version 1.34 2015-06-12
 * @author Cay Horstmann
 */
public class Calculator
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         CalculatorFrame frame = new CalculatorFrame();
         frame.setTitle("Calculator");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
      });
   }
}

package calculator;

import javax.swing.*;

/**
 * A frame with a calculator panel.
 */
public class CalculatorFrame extends JFrame
{
   public CalculatorFrame()
   {
      add(new CalculatorPanel());
      pack();
   }
}

package calculator;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
 * A panel with calculator buttons and a result display.
 */
public class CalculatorPanel extends JPanel
{
   private JButton display;
   private JPanel panel;
   private double result;
   private String lastCommand;
   private boolean start;

   public CalculatorPanel()//生产GUI的组件写在构造器中
   {
      setLayout(new BorderLayout());

      result = 0;
      lastCommand = "=";
      start = true;

      // add the display

      display = new JButton("0");//初始化的Label值，完成计算结果的显示内容
      display.setEnabled(false);//定义为flase，计算结果不能更改，仅具有显示功能
      add(display, BorderLayout.NORTH);//显示在最上方

      ActionListener insert = new InsertAction();
      ActionListener command = new CommandAction();

      // add the buttons in a 4 x 4 grid

      panel = new JPanel();//panel是一个容器组件
      panel.setLayout(new GridLayout(4, 4));//设置一个4*4的网格布局管理器

      addButton("0", insert);//
      addButton("1", insert);
      addButton("2", insert);
      addButton("/", command);

      addButton("3", insert);
      addButton("4", insert);
      addButton("5", insert);
      addButton("*", command);

      addButton("6", insert);
      addButton("7", insert);
      addButton("8", insert);
      addButton("-", command);

      addButton("9", insert);
      addButton(".", insert);
      addButton("=", command);
      addButton("+", command);
      
      add(panel, BorderLayout.CENTER);
      
      /*JButton b1=new JButton("验证");
      add(b1,BorderLayout.SOUTH);
      
      JButton bl=new JButton("验证 1");
      add(bl,BorderLayout.WEST);
      JButton br=new JButton("验证2");
      add(br,BorderLayout.EAST);*/

   }

   /**
    * Adds a button to the center panel.
    * @param label the button label
    * @param listener the button listener
    */
   private void addButton(String label, ActionListener listener)
   {
      JButton button = new JButton(label);
      button.addActionListener(listener);//将一个监听器添加到按钮中
      panel.add(button);//将button添加到panel组件上
   }

   /**
    * This action inserts the button action string to the end of the display text.
    */
   private class InsertAction implements ActionListener//实现了一个监听器接口
   {
      public void actionPerformed(ActionEvent event)
      {
         String input = event.getActionCommand();
         if (start)
         {
            display.setText("");
            start = false;
         }
         display.setText(display.getText() + input);
      }
   }

   /**
    * This action executes the command that the button action string denotes.
    */
   private class CommandAction implements ActionListener
   {
      public void actionPerformed(ActionEvent event)
      {
         String command = event.getActionCommand();//发出动作上的label

         if (start)
         {
            if (command.equals("-"))
            {
               display.setText(command);//setTest在display上显示“-”
               start = false;
            }
            else lastCommand = command;
         }
         else
         {
            calculate(Double.parseDouble(display.getText()));//通过parseDouble转换成数字
            lastCommand = command;
            start = true;
         }
      }
   }

   /**
    * Carries out the pending calculation.
    * @param x the value to be accumulated with the prior result.
    */
   public void calculate(double x)
   {
      if (lastCommand.equals("+")) result += x;
      else if (lastCommand.equals("-")) result -= x;
      else if (lastCommand.equals("*")) result *= x;
      else if (lastCommand.equals("/")) result /= x;
      else if (lastCommand.equals("=")) result = x;
      display.setText("" + result);//进行字符串的转换
   }
}

package text;

import java.awt.*;
import javax.swing.*;

/**
 * @version 1.41 2015-06-12
 * @author Cay Horstmann
 */
public class TextComponentTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         JFrame frame = new TextComponentFrame();//生成 TextComponentFrame类的GUI界面对象
         frame.setTitle("TextComponentTest");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//关闭界面的按钮操作
         frame.setVisible(true);//使结果可见
      });
   }
}

package text;

import java.awt.BorderLayout;
import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingConstants;

/**
 * A frame with sample text components.
 */
public class TextComponentFrame extends JFrame
{  //定义网格的行数、列数
   public static final int TEXTAREA_ROWS = 8;
   public static final int TEXTAREA_COLUMNS = 20;

   public TextComponentFrame()
   {
      JTextField textField = new JTextField();//创建一个新的文本域
      JPasswordField passwordField = new JPasswordField();

      JPanel northPanel = new JPanel();//构造一个JPanel组件
      northPanel.setLayout(new GridLayout(2, 2));//设置布局管理器
      northPanel.add(new JLabel("User name: ", SwingConstants.RIGHT));//指定右对齐标签
      northPanel.add(textField);
      northPanel.add(new JLabel("Password: ", SwingConstants.RIGHT));
      northPanel.add(passwordField);

      add(northPanel, BorderLayout.NORTH);//add方法

      JTextArea textArea = new JTextArea(TEXTAREA_ROWS, TEXTAREA_COLUMNS);
      JScrollPane scrollPane = new JScrollPane(textArea);

      add(scrollPane, BorderLayout.CENTER);

      // add button to append text into the text area

      JPanel southPanel = new JPanel();

      JButton insertButton = new JButton("Insert");
      southPanel.add(insertButton);
      insertButton.addActionListener(event ->
         textArea.append("User name: " + textField.getText() + " Password: "
            + new String(passwordField.getPassword()) + "\n"));

      add(southPanel, BorderLayout.SOUTH);
      pack();
   }
}

package checkBox;

import java.awt.*;
import javax.swing.*;

/**
 * @version 1.34 2015-06-12
 * @author Cay Horstmann
 */
public class CheckBoxTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         JFrame frame = new CheckBoxFrame();
         frame.setTitle("CheckBoxTest");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
      });
   }
}

package checkBox;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
 * A frame with a sample text label and check boxes for selecting font attributes.
 */
public class CheckBoxFrame extends JFrame
{
   private JLabel label;
   private JCheckBox bold;
   private JCheckBox italic;
   private static final int FONTSIZE = 24;

   public CheckBoxFrame()
   {
      // 添加示例文本标签

      label = new JLabel("The quick brown fox jumps over the lazy dog.");
      label.setFont(new Font("Serif", Font.BOLD, FONTSIZE));
      add(label, BorderLayout.CENTER);

      // 字体属性
      // 复选框状态的标签

      ActionListener listener = event -> {
         int mode = 0;
         if (bold.isSelected()) mode += Font.BOLD;
         if (italic.isSelected()) mode += Font.ITALIC;
         label.setFont(new Font("Serif", mode, FONTSIZE));
      };

      // 添加复选框

      JPanel buttonPanel = new JPanel();

      bold = new JCheckBox("Bold");
      bold.addActionListener(listener);
      bold.setSelected(true);
      buttonPanel.add(bold);

      italic = new JCheckBox("Italic");
      italic.addActionListener(listener);
      buttonPanel.add(italic);

      add(buttonPanel, BorderLayout.SOUTH);
      pack();
   }
}

package radioButton;

import java.awt.*;
import javax.swing.*;

/**
 * @version 1.34 2015-06-12
 * @author Cay Horstmann
 */
public class RadioButtonTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         JFrame frame = new RadioButtonFrame();
         frame.setTitle("RadioButtonTest");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
      });
   }
}

package radioButton;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
 * A frame with a sample text label and radio buttons for selecting font sizes.
 */
public class RadioButtonFrame extends JFrame//单选按钮
{ //定义四个私有属性
   private JPanel buttonPanel;
   private ButtonGroup group;
   private JLabel label;
   private static final int DEFAULT_SIZE = 36;

   public RadioButtonFrame()
   {      
      // add the sample text label

      label = new JLabel("The quick brown fox jumps over the lazy dog.");
      label.setFont(new Font("Serif", Font.PLAIN, DEFAULT_SIZE));//设置新字体
      add(label, BorderLayout.CENTER);

      // add the radio buttons

      buttonPanel = new JPanel();
      group = new ButtonGroup();
     //添加单选框按钮
      addRadioButton("Small", 8);
      addRadioButton("Medium", 12);
      addRadioButton("Large", 18);
      addRadioButton("Extra large", 36);

      add(buttonPanel, BorderLayout.SOUTH);
      pack();//调整窗口的大小
   }

   /**
    * Adds a radio button that sets the font size of the sample text.
    * @param name the string to appear on the button
    * @param size the font size that this button sets
    */
   public void addRadioButton(String name, int size)
   {
      boolean selected = size == DEFAULT_SIZE;//布尔类型，大小的定义
      JRadioButton button = new JRadioButton(name, selected);
      group.add(button);
      buttonPanel.add(button);

      // this listener sets the label font size
      //这个监听器设置标签字体大小

      ActionListener listener = event -> label.setFont(new Font("Serif", Font.PLAIN, size));//表明新的字体，大小

      button.addActionListener(listener);
   }
}

package border;

import java.awt.*;
import javax.swing.*;

/**
 * @version 1.34 2015-06-13
 * @author Cay Horstmann
 */
public class BorderTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         JFrame frame = new BorderFrame();
         frame.setTitle("BorderTest");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
      });
   }
}

package border;

import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;

/**
 * A frame with radio buttons to pick a border style.
 */
public class BorderFrame extends JFrame
{
   private JPanel demoPanel;
   private JPanel buttonPanel;
   private ButtonGroup group;

   public BorderFrame()
   {
      demoPanel = new JPanel();
      buttonPanel = new JPanel();
      group = new ButtonGroup();
      
      //设置不同的边框类型按钮，共六种（提供标准 Border 对象的工厂类）
      addRadioButton("Lowered bevel", BorderFactory.createLoweredBevelBorder());
      addRadioButton("Raised bevel", BorderFactory.createRaisedBevelBorder());
      addRadioButton("Etched", BorderFactory.createEtchedBorder());
      addRadioButton("Line", BorderFactory.createLineBorder(Color.BLUE));
      addRadioButton("Matte", BorderFactory.createMatteBorder(10, 10, 10, 10, Color.BLUE));
      addRadioButton("Empty", BorderFactory.createEmptyBorder());
      
      Border etched = BorderFactory.createEtchedBorder();
      Border titled = BorderFactory.createTitledBorder(etched, "Border types");
      buttonPanel.setBorder(titled);

      setLayout(new GridLayout(2, 1));
      add(buttonPanel);
      add(demoPanel);
      pack();
   }

   public void addRadioButton(String buttonName, Border b)
   {
      JRadioButton button = new JRadioButton(buttonName);
      button.addActionListener(event -> demoPanel.setBorder(b));
      group.add(button);
      buttonPanel.add(button);
   }
}

package comboBox;

import java.awt.*;
import javax.swing.*;

/**
 * @version 1.35 2015-06-12
 * @author Cay Horstmann
 */
public class ComboBoxTest
{
   public static void main(String[] args)
   {
  
      EventQueue.invokeLater(() -> {
     
         JFrame frame = new ComboBoxFrame();
      
         frame.setTitle("ComboBoxTest");
        
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      
         frame.setVisible(true);
      });
   }
}

package comboBox;

import java.awt.BorderLayout;
import java.awt.Font;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

/**
 * A frame with a sample text label and a combo box for selecting font faces.
 */
public class ComboBoxFrame extends JFrame
{
   private JComboBox<String> faceCombo;//定义组合框面
   private JLabel label;//定义标签
   private static final int DEFAULT_SIZE = 24;

   public ComboBoxFrame()
   {
      // add the sample text label

      label = new JLabel("The quick brown fox jumps over the lazy dog.");
      label.setFont(new Font("Serif", Font.PLAIN, DEFAULT_SIZE));//设置组件的字体
      add(label, BorderLayout.CENTER);

      // make a combo box and add face names
      //调用addItem方法添加选项
      faceCombo = new JComboBox<>();
      faceCombo.addItem("Serif");
      faceCombo.addItem("SansSerif");
      faceCombo.addItem("Monospaced");
      faceCombo.addItem("Dialog");
      faceCombo.addItem("DialogInput");

      // the combo box listener changes the label font to the selected face name

      faceCombo.addActionListener(event ->//组合框产生一个动作事件
         label.setFont(
            new Font(faceCombo.getItemAt(faceCombo.getSelectedIndex()), 
               Font.PLAIN, DEFAULT_SIZE)));

      // add combo box to a panel at the frame‘s southern border

      JPanel comboPanel = new JPanel();
      comboPanel.add(faceCombo);
      add(comboPanel, BorderLayout.SOUTH);
      pack();
   }
}

package slider;

import java.awt.*;
import javax.swing.*;

/**
 * @version 1.15 2015-06-12
 * @author Cay Horstmann
 */
public class SliderTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         SliderFrame frame = new SliderFrame();
         frame.setTitle("SliderTest");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
      });
   }
}

package slider;

import java.awt.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;

/**
 * A frame with many sliders and a text field to show slider values.
 */
public class SliderFrame extends JFrame {
    private JPanel sliderPanel;
    private JTextField textField;
    private ChangeListener listener;

    public SliderFrame() {
        sliderPanel = new JPanel();
        sliderPanel.setLayout(new GridBagLayout());

        // common listener for all sliders
        listener = event -> {
            // update text field when the slider value changes
            JSlider source = (JSlider) event.getSource();
            textField.setText("" + source.getValue());
        };

        // add a plain slider

        JSlider slider = new JSlider();
        addSlider(slider, "Plain");

        // add a slider with major and minor ticks

        slider = new JSlider();
        slider.setPaintTicks(true);
        slider.setMajorTickSpacing(20);
        slider.setMinorTickSpacing(5);
        addSlider(slider, "Ticks");

        // add a slider that snaps to ticks

        slider = new JSlider();
        slider.setPaintTicks(true);
        slider.setSnapToTicks(true);
        slider.setMajorTickSpacing(20);
        slider.setMinorTickSpacing(5);
        addSlider(slider, "Snap to ticks");

        // add a slider with no track

        slider = new JSlider();
        slider.setPaintTicks(true);
        slider.setMajorTickSpacing(20);
        slider.setMinorTickSpacing(5);
        slider.setPaintTrack(false);
        addSlider(slider, "No track");

        // add an inverted slider

        slider = new JSlider();
        slider.setPaintTicks(true);
        slider.setMajorTickSpacing(20);
        slider.setMinorTickSpacing(5);
        slider.setInverted(true);
        addSlider(slider, "Inverted");

        // add a slider with numeric labels

        slider = new JSlider();
        slider.setPaintTicks(true);
        slider.setPaintLabels(true);
        slider.setMajorTickSpacing(20);
        slider.setMinorTickSpacing(5);
        addSlider(slider, "Labels");

        // add a slider with alphabetic labels

        slider = new JSlider();
        slider.setPaintLabels(true);
        slider.setPaintTicks(true);
        slider.setMajorTickSpacing(20);
        slider.setMinorTickSpacing(5);

        Dictionary<Integer, Component> labelTable = new Hashtable<>();
        labelTable.put(0, new JLabel("A"));
        labelTable.put(20, new JLabel("B"));
        labelTable.put(40, new JLabel("C"));
        labelTable.put(60, new JLabel("D"));
        labelTable.put(80, new JLabel("E"));
        labelTable.put(100, new JLabel("F"));

        slider.setLabelTable(labelTable);
        addSlider(slider, "Custom labels");

        // add a slider with icon labels

        slider = new JSlider();
        slider.setPaintTicks(true);// 显示标记
        slider.setPaintLabels(true);// 确定是否在滑块上绘制标签
        slider.setSnapToTicks(true);// 最靠近用户放置滑块处的刻度标记的值
        slider.setMajorTickSpacing(20);// 大标尺标记
        slider.setMinorTickSpacing(20);// 小标尺标记

        labelTable = new Hashtable<Integer, Component>();

        // add card images

        labelTable.put(0, new JLabel(new ImageIcon("nine.gif")));
        labelTable.put(20, new JLabel(new ImageIcon("ten.gif")));
        labelTable.put(40, new JLabel(new ImageIcon("jack.gif")));
        labelTable.put(60, new JLabel(new ImageIcon("queen.gif")));
        labelTable.put(80, new JLabel(new ImageIcon("king.gif")));
        labelTable.put(100, new JLabel(new ImageIcon("ace.gif")));

        slider.setLabelTable(labelTable);
        addSlider(slider, "Icon labels");

        // add the text field that displays the slider value

        textField = new JTextField();
        add(sliderPanel, BorderLayout.CENTER);
        add(textField, BorderLayout.SOUTH);
        pack();
    }

    /**
     * Adds a slider to the slider panel and hooks up the listener
     * 
     * @param s           the slider
     * @param description the slider description
     */
    public void addSlider(JSlider s, String description) {
        s.addChangeListener(listener);
        JPanel panel = new JPanel();
        panel.add(s);
        panel.add(new JLabel(description));
        panel.setAlignmentX(Component.LEFT_ALIGNMENT);
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridy = sliderPanel.getComponentCount();
        gbc.anchor = GridBagConstraints.WEST;
        sliderPanel.add(panel, gbc);
    }
}

package menu;

import java.awt.*;
import javax.swing.*;

/**
 * @version 1.24 2012-06-12
 * @author Cay Horstmann
 */
public class MenuTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         JFrame frame = new MenuFrame();
         frame.setTitle("MenuTest");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
      });
   }
}

package menu;

import java.awt.event.*;
import javax.swing.*;

/**
 * A frame with a sample menu bar.
 */
public class MenuFrame extends JFrame
{
   private static final int DEFAULT_WIDTH = 300;
   private static final int DEFAULT_HEIGHT = 200;
   private Action saveAction;
   private Action saveAsAction;
   private JCheckBoxMenuItem readonlyItem;
   private JPopupMenu popup;

   /**
    * A sample action that prints the action name to System.out
    */
   class TestAction extends AbstractAction
   {
      public TestAction(String name)
      {
         super(name);
      }

      public void actionPerformed(ActionEvent event)
      {
         System.out.println(getValue(Action.NAME) + " selected.");
      }
   }

   public MenuFrame()
   {
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

      JMenu fileMenu = new JMenu("File");
      fileMenu.add(new TestAction("New"));

      //演示加速器

      JMenuItem openItem = fileMenu.add(new TestAction("Open"));
      openItem.setAccelerator(KeyStroke.getKeyStroke("ctrl O"));

      fileMenu.addSeparator();

      saveAction = new TestAction("Save");
      JMenuItem saveItem = fileMenu.add(saveAction);
      saveItem.setAccelerator(KeyStroke.getKeyStroke("ctrl S"));

      saveAsAction = new TestAction("Save As");
      fileMenu.add(saveAsAction);
      fileMenu.addSeparator();

      fileMenu.add(new AbstractAction("Exit")
         {
            public void actionPerformed(ActionEvent event)
            {
               System.exit(0);
            }
         });

      //演示复选框和单选按钮菜单

      readonlyItem = new JCheckBoxMenuItem("Read-only");
      readonlyItem.addActionListener(new ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               boolean saveOk = !readonlyItem.isSelected();
               saveAction.setEnabled(saveOk);
               saveAsAction.setEnabled(saveOk);
            }
         });

      ButtonGroup group = new ButtonGroup();

      JRadioButtonMenuItem insertItem = new JRadioButtonMenuItem("Insert");
      insertItem.setSelected(true);
      JRadioButtonMenuItem overtypeItem = new JRadioButtonMenuItem("Overtype");

      group.add(insertItem);
      group.add(overtypeItem);

      //演示图标

      Action cutAction = new TestAction("Cut");
      cutAction.putValue(Action.SMALL_ICON, new ImageIcon("cut.gif"));
      Action copyAction = new TestAction("Copy");
      copyAction.putValue(Action.SMALL_ICON, new ImageIcon("copy.gif"));
      Action pasteAction = new TestAction("Paste");
      pasteAction.putValue(Action.SMALL_ICON, new ImageIcon("paste.gif"));

      JMenu editMenu = new JMenu("Edit");
      editMenu.add(cutAction);
      editMenu.add(copyAction);
      editMenu.add(pasteAction);

      // 演示嵌套菜单

      JMenu optionMenu = new JMenu("Options");

      optionMenu.add(readonlyItem);
      optionMenu.addSeparator();
      optionMenu.add(insertItem);
      optionMenu.add(overtypeItem);

      editMenu.addSeparator();
      editMenu.add(optionMenu);

      // 说明助记符

      JMenu helpMenu = new JMenu("Help");
      helpMenu.setMnemonic(‘H‘);

      JMenuItem indexItem = new JMenuItem("Index");
      indexItem.setMnemonic(‘I‘);
      helpMenu.add(indexItem);

      //您还可以向操作添加助记符键
      Action aboutAction = new TestAction("About");
      aboutAction.putValue(Action.MNEMONIC_KEY, new Integer(‘A‘));
      helpMenu.add(aboutAction);
      
      // 将所有顶级菜单添加到菜单栏

      JMenuBar menuBar = new JMenuBar();
      setJMenuBar(menuBar);

      menuBar.add(fileMenu);
      menuBar.add(editMenu);
      menuBar.add(helpMenu);

      // 显示弹出窗口

      popup = new JPopupMenu();
      popup.add(cutAction);
      popup.add(copyAction);
      popup.add(pasteAction);

      JPanel panel = new JPanel();
      panel.setComponentPopupMenu(popup);
      add(panel);
   }

package toolBar;

import java.awt.*;
import javax.swing.*;

/**
 * @version 1.14 2015-06-12
 * @author Cay Horstmann
 */
public class ToolBarTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         ToolBarFrame frame = new ToolBarFrame();
         frame.setTitle("ToolBarTest");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
      });
   }
}

package toolBar;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
 * A frame with a toolbar and menu for color changes.
 */
public class ToolBarFrame extends JFrame
{  //定义两个私有属性
   private static final int DEFAULT_WIDTH = 300;
   private static final int DEFAULT_HEIGHT = 200;
   private JPanel panel;

   public ToolBarFrame() //定义工具提示类
   {
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

      // add a panel for color change

      panel = new JPanel();//创建新的JPanel
      add(panel, BorderLayout.CENTER);

      // set up actions
      //建立动作

      Action blueAction = new ColorAction("Blue", new ImageIcon("blue-ball.gif"), Color.BLUE);
      Action yellowAction = new ColorAction("Yellow", new ImageIcon("yellow-ball.gif"),
            Color.YELLOW);
      Action redAction = new ColorAction("Red", new ImageIcon("red-ball.gif"), Color.RED);

      Action exitAction = new AbstractAction("Exit", new ImageIcon("exit.gif"))
         {
            public void actionPerformed(ActionEvent event)
            {
               System.exit(0);
            }
         };
      exitAction.putValue(Action.SHORT_DESCRIPTION, "Exit");

      // populate toolbar

      JToolBar bar = new JToolBar();
      bar.add(blueAction);//用Action对象填充工具栏
      bar.add(yellowAction);
      bar.add(redAction);
      bar.addSeparator();//用分隔符将按钮分组
      bar.add(exitAction);
      add(bar, BorderLayout.NORTH);

      // populate menu

      JMenu menu = new JMenu("Color");//显示颜色的菜单
      menu.add(yellowAction);//在菜单添加颜色动作
      menu.add(blueAction);
      menu.add(redAction);
      menu.add(exitAction);
      JMenuBar menuBar = new JMenuBar();
      menuBar.add(menu);
      setJMenuBar(menuBar);
   }

   /**
    * The color action sets the background of the frame to a given color.
    */
   class ColorAction extends AbstractAction
   {
      public ColorAction(String name, Icon icon, Color c)
      {
         putValue(Action.NAME, name);//动作名称，显示在按钮和菜单
         putValue(Action.SMALL_ICON, icon);//存储小图标的地方；显示在按钮、菜单项或工具栏中
         putValue(Action.SHORT_DESCRIPTION, name + " background");
         putValue("Color", c);
      }

      public void actionPerformed(ActionEvent event)
      {
         Color c = (Color) getValue("Color");
         panel.setBackground(c);
      }
   }
}

package gridbag;

import java.awt.EventQueue;

import javax.swing.JFrame;

/**
 * @version 1.35 2015-06-12
 * @author Cay Horstmann
 */
public class GridBagLayoutTest {
    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            JFrame frame = new FontFrame();
            frame.setTitle("GridBagLayoutTest");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
        });
    }
}

package gridbag;

import java.awt.Font;
import java.awt.GridBagLayout;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextArea;

/**
 * A frame that uses a grid bag layout to arrange font selection components.
 */
public class FontFrame extends JFrame
{
   public static final int TEXT_ROWS = 10;
   public static final int TEXT_COLUMNS = 20;

   private JComboBox<String> face;
   private JComboBox<Integer> size;
   private JCheckBox bold;
   private JCheckBox italic;
   private JTextArea sample;

   public FontFrame()
   {
      GridBagLayout layout = new GridBagLayout();
      setLayout(layout);

      ActionListener listener = event -> updateSample();

      // 构建组件

      JLabel faceLabel = new JLabel("Face: ");

      face = new JComboBox<>(new String[] { "Serif", "SansSerif", "Monospaced",
            "Dialog", "DialogInput" });

      face.addActionListener(listener);

      JLabel sizeLabel = new JLabel("Size: ");

      size = new JComboBox<>(new Integer[] { 8, 10, 12, 15, 18, 24, 36, 48 });

      size.addActionListener(listener);

      bold = new JCheckBox("Bold");
      bold.addActionListener(listener);

      italic = new JCheckBox("Italic");
      italic.addActionListener(listener);

      sample = new JTextArea(TEXT_ROWS, TEXT_COLUMNS);
      sample.setText("The quick brown fox jumps over the lazy dog");
      sample.setEditable(false);
      sample.setLineWrap(true);
      sample.setBorder(BorderFactory.createEtchedBorder());

      // 使用GBC便利类向网格添加组件

      add(faceLabel, new GBC(0, 0).setAnchor(GBC.EAST));
      add(face, new GBC(1, 0).setFill(GBC.HORIZONTAL).setWeight(100, 0)
            .setInsets(1));
      add(sizeLabel, new GBC(0, 1).setAnchor(GBC.EAST));
      add(size, new GBC(1, 1).setFill(GBC.HORIZONTAL).setWeight(100, 0)
            .setInsets(1));
      add(bold, new GBC(0, 2, 2, 1).setAnchor(GBC.CENTER).setWeight(100, 100));
      add(italic, new GBC(0, 3, 2, 1).setAnchor(GBC.CENTER).setWeight(100, 100));
      add(sample, new GBC(2, 0, 1, 4).setFill(GBC.BOTH).setWeight(100, 100));
      pack();
      updateSample();
   }

   public void updateSample()
   {
      String fontFace = (String) face.getSelectedItem();
      int fontStyle = (bold.isSelected() ? Font.BOLD : 0)
            + (italic.isSelected() ? Font.ITALIC : 0);
      int fontSize = size.getItemAt(size.getSelectedIndex());
      Font font = new Font(fontFace, fontStyle, fontSize);
      sample.setFont(font);
      sample.repaint();
   }

package gridbag;

import java.awt.*;

/**
 * This class simplifies the use of the GridBagConstraints class.
 * 
 * @version 1.01 2004-05-06
 * @author Cay Horstmann
 */
public class GBC extends GridBagConstraints {
    /**
     * Constructs a GBC with a given gridx and gridy position and all other grid bag
     * constraint values set to the default.
     * 
     * @param gridx the gridx position
     * @param gridy the gridy position
     */
    public GBC(int gridx, int gridy) {
        this.gridx = gridx;
        this.gridy = gridy;
    }

    /**
     * Constructs a GBC with given gridx, gridy, gridwidth, gridheight and all other
     * grid bag constraint values set to the default.
     * 
     * @param gridx      the gridx position
     * @param gridy      the gridy position
     * @param gridwidth  the cell span in x-direction
     * @param gridheight the cell span in y-direction
     */
    public GBC(int gridx, int gridy, int gridwidth, int gridheight) {
        this.gridx = gridx;
        this.gridy = gridy;
        this.gridwidth = gridwidth;
        this.gridheight = gridheight;
    }

    /**
     * Sets the anchor.
     * 
     * @param anchor the anchor value
     * @return this object for further modification
     */
    public GBC setAnchor(int anchor) {
        this.anchor = anchor;
        return this;
    }

    /**
     * Sets the fill direction.
     * 
     * @param fill the fill direction
     * @return this object for further modification
     */
    public GBC setFill(int fill) {
        this.fill = fill;
        return this;
    }

    /**
     * Sets the cell weights.
     * 
     * @param weightx the cell weight in x-direction
     * @param weighty the cell weight in y-direction
     * @return this object for further modification
     */
    public GBC setWeight(double weightx, double weighty) {
        this.weightx = weightx;
        this.weighty = weighty;
        return this;
    }

    /**
     * Sets the insets of this cell.
     * 
     * @param distance the spacing to use in all directions
     * @return this object for further modification
     */
    public GBC setInsets(int distance) {
        this.insets = new Insets(distance, distance, distance, distance);
        return this;
    }

    /**
     * Sets the insets of this cell.
     * 
     * @param top    the spacing to use on top
     * @param left   the spacing to use to the left
     * @param bottom the spacing to use on the bottom
     * @param right  the spacing to use to the right
     * @return this object for further modification
     */
    public GBC setInsets(int top, int left, int bottom, int right) {
        this.insets = new Insets(top, left, bottom, right);
        return this;
    }

    /**
     * Sets the internal padding
     * 
     * @param ipadx the internal padding in x-direction
     * @param ipady the internal padding in y-direction
     * @return this object for further modification
     */
    public GBC setIpad(int ipadx, int ipady) {
        this.ipadx = ipadx;
        this.ipady = ipady;
        return this;
    }
}

package groupLayout;

import java.awt.EventQueue;

import javax.swing.JFrame;

/**
 * @version 1.01 2015-06-12
 * @author Cay Horstmann
 */
public class GroupLayoutTest {
    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            JFrame frame = new FontFrame();
            frame.setTitle("GroupLayoutTest");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
        });
    }
}

package groupLayout;

import java.awt.Font;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.GroupLayout;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.LayoutStyle;
import javax.swing.SwingConstants;

/**
 * A frame that uses a group layout to arrange font selection components.
 */
public class FontFrame extends JFrame {
    public static final int TEXT_ROWS = 10;
    public static final int TEXT_COLUMNS = 20;

    private JComboBox<String> face;
    private JComboBox<Integer> size;
    private JCheckBox bold;
    private JCheckBox italic;
    private JScrollPane pane;
    private JTextArea sample;

    public FontFrame() {
        ActionListener listener = event -> updateSample();

        // construct components

        JLabel faceLabel = new JLabel("Face: ");

        face = new JComboBox<>(new String[] { "Serif", "SansSerif", "Monospaced", "Dialog", "DialogInput" });

        face.addActionListener(listener);

        JLabel sizeLabel = new JLabel("Size: ");

        size = new JComboBox<>(new Integer[] { 8, 10, 12, 15, 18, 24, 36, 48 });

        size.addActionListener(listener);

        bold = new JCheckBox("Bold");
        bold.addActionListener(listener);

        italic = new JCheckBox("Italic");
        italic.addActionListener(listener);

        sample = new JTextArea(TEXT_ROWS, TEXT_COLUMNS);
        sample.setText("The quick brown fox jumps over the lazy dog");
        sample.setEditable(false);
        sample.setLineWrap(true);
        sample.setBorder(BorderFactory.createEtchedBorder());

        pane = new JScrollPane(sample);

        GroupLayout layout = new GroupLayout(getContentPane());
        setLayout(layout);
        layout.setHorizontalGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup().addContainerGap()
                        .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                                .addGroup(GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                        .addGroup(layout.createParallelGroup(GroupLayout.Alignment.TRAILING)
                                                .addComponent(faceLabel).addComponent(sizeLabel))
                                        .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
                                        .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING, false)
                                                .addComponent(size).addComponent(face)))
                                .addComponent(italic).addComponent(bold))
                        .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED).addComponent(pane).addContainerGap()));

        layout.linkSize(SwingConstants.HORIZONTAL, new java.awt.Component[] { face, size });

        layout.setVerticalGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup().addContainerGap()
                        .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                                .addComponent(pane, GroupLayout.Alignment.TRAILING)
                                .addGroup(layout.createSequentialGroup()
                                        .addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
                                                .addComponent(face).addComponent(faceLabel))
                                        .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
                                        .addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
                                                .addComponent(size).addComponent(sizeLabel))
                                        .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
                                        .addComponent(italic, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE,
                                                Short.MAX_VALUE)
                                        .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED).addComponent(bold,
                                                GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
                        .addContainerGap()));
        pack();
    }

    public void updateSample() {
        String fontFace = (String) face.getSelectedItem();
        int fontStyle = (bold.isSelected() ? Font.BOLD : 0) + (italic.isSelected() ? Font.ITALIC : 0);
        int fontSize = size.getItemAt(size.getSelectedIndex());
        Font font = new Font(fontFace, fontStyle, fontSize);
        sample.setFont(font);
        sample.repaint();
    }
}

package circleLayout;

import java.awt.*;
import javax.swing.*;

/**
 * @version 1.33 2015-06-12
 * @author Cay Horstmann
 */
public class CircleLayoutTest {
    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            JFrame frame = new CircleLayoutFrame();
            frame.setTitle("CircleLayoutTest");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
        });
    }
}

package circleLayout;

import javax.swing.*;

/**
 * A frame that shows buttons arranged along a circle.
 */
public class CircleLayoutFrame extends JFrame {
    public CircleLayoutFrame() {
        setLayout(new CircleLayout());
        add(new JButton("Yellow"));
        add(new JButton("Blue"));
        add(new JButton("Red"));
        add(new JButton("Green"));
        add(new JButton("Orange"));
        add(new JButton("Fuchsia"));
        add(new JButton("Indigo"));
        pack();
    }
}

package circleLayout;

import java.awt.*;

/**
 * A layout manager that lays out components along a circle.
 */
public class CircleLayout implements LayoutManager {
    private int minWidth = 0;
    private int minHeight = 0;
    private int preferredWidth = 0;
    private int preferredHeight = 0;
    private boolean sizesSet = false;
    private int maxComponentWidth = 0;
    private int maxComponentHeight = 0;

    public void addLayoutComponent(String name, Component comp) {
    }

    public void removeLayoutComponent(Component comp) {
    }

    public void setSizes(Container parent) {
        if (sizesSet)
            return;
        int n = parent.getComponentCount();

        preferredWidth = 0;
        preferredHeight = 0;
        minWidth = 0;
        minHeight = 0;
        maxComponentWidth = 0;
        maxComponentHeight = 0;

        // compute the maximum component widths and heights
        // and set the preferred size to the sum of the component sizes.
        for (int i = 0; i < n; i++) {
            Component c = parent.getComponent(i);
            if (c.isVisible()) {
                Dimension d = c.getPreferredSize();
                maxComponentWidth = Math.max(maxComponentWidth, d.width);
                maxComponentHeight = Math.max(maxComponentHeight, d.height);
                preferredWidth += d.width;
                preferredHeight += d.height;
            }
        }
        minWidth = preferredWidth / 2;
        minHeight = preferredHeight / 2;
        sizesSet = true;
    }

    public Dimension preferredLayoutSize(Container parent) {
        setSizes(parent);
        Insets insets = parent.getInsets();
        int width = preferredWidth + insets.left + insets.right;
        int height = preferredHeight + insets.top + insets.bottom;
        return new Dimension(width, height);
    }

    public Dimension minimumLayoutSize(Container parent) {
        setSizes(parent);
        Insets insets = parent.getInsets();
        int width = minWidth + insets.left + insets.right;
        int height = minHeight + insets.top + insets.bottom;
        return new Dimension(width, height);
    }

    public void layoutContainer(Container parent) {
        setSizes(parent);

        // compute center of the circle

        Insets insets = parent.getInsets();
        int containerWidth = parent.getSize().width - insets.left - insets.right;
        int containerHeight = parent.getSize().height - insets.top - insets.bottom;

        int xcenter = insets.left + containerWidth / 2;
        int ycenter = insets.top + containerHeight / 2;

        // compute radius of the circle

        int xradius = (containerWidth - maxComponentWidth) / 2;
        int yradius = (containerHeight - maxComponentHeight) / 2;
        int radius = Math.min(xradius, yradius);

        // lay out components along the circle

        int n = parent.getComponentCount();
        for (int i = 0; i < n; i++) {
            Component c = parent.getComponent(i);
            if (c.isVisible()) {
                double angle = 2 * Math.PI * i / n;

                // center point of component
                int x = xcenter + (int) (Math.cos(angle) * radius);
                int y = ycenter + (int) (Math.sin(angle) * radius);

                // move component so that its center is (x, y)
                // and its size is its preferred size
                Dimension d = c.getPreferredSize();
                c.setBounds(x - d.width / 2, y - d.height / 2, d.width, d.height);
            }
        }
    }
}

package optionDialog;

import java.awt.*;
import javax.swing.*;

/**
 * @version 1.34 2015-06-12
 * @author Cay Horstmann
 */
public class OptionDialogTest {
    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            JFrame frame = new OptionDialogFrame();
            frame.setTitle("OptionDialogTest");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
        });
    }
}

package optionDialog;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;

/**
 * A frame that contains settings for selecting various option dialogs.
 */
public class OptionDialogFrame extends JFrame {
    private ButtonPanel typePanel;
    private ButtonPanel messagePanel;
    private ButtonPanel messageTypePanel;
    private ButtonPanel optionTypePanel;
    private ButtonPanel optionsPanel;
    private ButtonPanel inputPanel;
    private String messageString = "Message";
    private Icon messageIcon = new ImageIcon("blue-ball.gif");
    private Object messageObject = new Date();
    private Component messageComponent = new SampleComponent();

    public OptionDialogFrame() {
        JPanel gridPanel = new JPanel();
        gridPanel.setLayout(new GridLayout(2, 3));//创建2行3列的网格布局

        typePanel = new ButtonPanel("Type", "Message", "Confirm", "Option", "Input");
        messageTypePanel = new ButtonPanel("Message Type", "ERROR_MESSAGE", "INFORMATION_MESSAGE", "WARNING_MESSAGE",
                "QUESTION_MESSAGE", "PLAIN_MESSAGE");
        messagePanel = new ButtonPanel("Message", "String", "Icon", "Component", "Other", "Object[]");
        optionTypePanel = new ButtonPanel("Confirm", "DEFAULT_OPTION", "YES_NO_OPTION", "YES_NO_CANCEL_OPTION",
                "OK_CANCEL_OPTION");
        optionsPanel = new ButtonPanel("Option", "String[]", "Icon[]", "Object[]");
        inputPanel = new ButtonPanel("Input", "Text field", "Combo box");

        gridPanel.add(typePanel);
        gridPanel.add(messageTypePanel);
        gridPanel.add(messagePanel);
        gridPanel.add(optionTypePanel);
        gridPanel.add(optionsPanel);
        gridPanel.add(inputPanel);//添加按钮

        // add a panel with a Show button

        JPanel showPanel = new JPanel();
        JButton showButton = new JButton("Show");//创建一个带"Show"的按钮。
        showButton.addActionListener(new ShowAction());
        showPanel.add(showButton);

        add(gridPanel, BorderLayout.CENTER);//中间区域的布局约束（容器中央）。
        add(showPanel, BorderLayout.SOUTH);//南区域的布局约束（容器底部）。
        pack();
    }

    /**
     * Gets the currently selected message.
     * 
     * @return a string, icon, component, or object array, depending on the Message
     *         panel selection
     */
    public Object getMessage() {
        String s = messagePanel.getSelection();
        if (s.equals("String"))//将此字符串与指定的对象比较
            return messageString;
        else if (s.equals("Icon"))
            return messageIcon;
        else if (s.equals("Component"))
            return messageComponent;
        else if (s.equals("Object[]"))
            return new Object[] { messageString, messageIcon, messageComponent, messageObject };
        else if (s.equals("Other"))
            return messageObject;
        else
            return null;
    }

    /**
     * Gets the currently selected options.
     * 
     * @return an array of strings, icons, or objects, depending on the Option panel
     *         selection
     */
    public Object[] getOptions() {
        String s = optionsPanel.getSelection();
        if (s.equals("String[]"))
            return new String[] { "Yellow", "Blue", "Red" };
        else if (s.equals("Icon[]"))
            return new Icon[] { new ImageIcon("yellow-ball.gif"), new ImageIcon("blue-ball.gif"),
                    new ImageIcon("red-ball.gif") };
        else if (s.equals("Object[]"))
            return new Object[] { messageString, messageIcon, messageComponent, messageObject };
        else
            return null;
    }

    /**
     * Gets the selected message or option type
     * 
     * @param panel the Message Type or Confirm panel
     * @return the selected XXX_MESSAGE or XXX_OPTION constant from the JOptionPane
     *         class
     */
    public int getType(ButtonPanel panel) {
        String s = panel.getSelection();
        try {
            return JOptionPane.class.getField(s).getInt(null);
        } catch (Exception e) {
            return -1;
        }
    }

    /**
     * The action listener for the Show button shows a Confirm, Input, Message, or
     * Option dialog depending on the Type panel selection.
     */
    private class ShowAction implements ActionListener {
        public void actionPerformed(ActionEvent event) {
            if (typePanel.getSelection().equals("Confirm"))
                JOptionPane.showConfirmDialog(OptionDialogFrame.this, getMessage(), "Title", getType(optionTypePanel),
                        getType(messageTypePanel));
            else if (typePanel.getSelection().equals("Input")) {
                if (inputPanel.getSelection().equals("Text field"))
                    JOptionPane.showInputDialog(OptionDialogFrame.this, getMessage(), "Title",
                            getType(messageTypePanel));
                else
                    JOptionPane.showInputDialog(OptionDialogFrame.this, getMessage(), "Title",
                            getType(messageTypePanel), null, new String[] { "Yellow", "Blue", "Red" }, "Blue");
            } else if (typePanel.getSelection().equals("Message"))
                JOptionPane.showMessageDialog(OptionDialogFrame.this, getMessage(), "Title", getType(messageTypePanel));
            else if (typePanel.getSelection().equals("Option"))
                JOptionPane.showOptionDialog(OptionDialogFrame.this, getMessage(), "Title", getType(optionTypePanel),
                        getType(messageTypePanel), null, getOptions(), getOptions()[0]);
        }
    }
}

/**
 * A component with a painted surface
 */

class SampleComponent extends JComponent {
    public void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        Rectangle2D rect = new Rectangle2D.Double(0, 0, getWidth() - 1, getHeight() - 1);//根据指定的 double 坐标构造和初始化 Rectangle2D
        g2.setPaint(Color.YELLOW);
        g2.fill(rect);
        g2.setPaint(Color.BLUE);
        g2.draw(rect);
    }

    public Dimension getPreferredSize() {
        return new Dimension(10, 10);//构造一个 Dimension，并将其初始化为指定宽度和高度。
    }
}

package optionDialog;

import javax.swing.*;

/**
 * A panel with radio buttons inside a titled border.
 */
public class ButtonPanel extends JPanel {
    private ButtonGroup group;

    /**
     * Constructs a button panel.
     * 
     * @param title   the title shown in the border
     * @param options an array of radio button labels
     */
    public ButtonPanel(String title, String... options) {
        setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(), title));//设置组件的边框,向现有边框添加一个标题
        setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));//从上到下垂直布置组件
        group = new ButtonGroup();

        // make one radio button for each option
        for (String option : options) {
            JRadioButton b = new JRadioButton(option);//创建一个具有指定文本的状态为未选择的单选按钮
            b.setActionCommand(option);//设置此按钮的动作命令
            add(b);
            group.add(b);//将按钮添加到组中
            b.setSelected(option == options[0]);//设置按钮的状态
        }
    }

    /**
     * Gets the currently selected option.
     * 
     * @return the label of the currently selected radio button.
     */
    public String getSelection() {
        return group.getSelection().getActionCommand();//返回该按钮的动作命令字符串
    }
}

package dialog;

import java.awt.*;
import javax.swing.*;

/**
 * @version 1.34 2012-06-12
 * @author Cay Horstmann
 */
public class DialogTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         JFrame frame = new DialogFrame();
         frame.setTitle("DialogTest");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
      });
   }
}

package dialog;

import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;

/**
 * A frame with a menu whose File->About action shows a dialog.
 */
public class DialogFrame extends JFrame
{
   private static final int DEFAULT_WIDTH = 300;
   private static final int DEFAULT_HEIGHT = 200;
   private AboutDialog dialog;

   public DialogFrame()
   {
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

      // Construct a File menu.

      JMenuBar menuBar = new JMenuBar();//菜单栏的实现
      setJMenuBar(menuBar);//设置此窗体的菜单栏
      JMenu fileMenu = new JMenu("File");//菜单的该实现是一个包含 JMenuItem 的弹出窗口，用户选择 JMenuBar 上的项时会显示该 JMenuItem。
      menuBar.add(fileMenu);//将指定的菜单追加到菜单栏的末尾

      // Add About and Exit menu items.

      // The About item shows the About dialog.

      JMenuItem aboutItem = new JMenuItem("About");//菜单中的项的实现
      aboutItem.addActionListener(event -> {
         if (dialog == null) // first time
            dialog = new AboutDialog(DialogFrame.this);
         dialog.setVisible(true); // 设置是否可见
      });
      fileMenu.add(aboutItem);//将某个菜单项追加到此菜单的末尾。返回添加的菜单项

      // The Exit item exits the program.

      JMenuItem exitItem = new JMenuItem("Exit");
      exitItem.addActionListener(event -> System.exit(0));
      fileMenu.add(exitItem);
   }
}

package dialog;

import java.awt.BorderLayout;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

/**
 * A sample modal dialog that displays a message and waits for the user to click the OK button.
 */
public class AboutDialog extends JDialog
{
    //创建一个具有指定标题、所有者 Frame 和模式的对话框。如果 owner 为 null，则一个共享的、隐藏的窗体将被设置为该对话框的所有者。
   public AboutDialog(JFrame owner)
   {
      super(owner, "About DialogTest", true);

      // add HTML label to center
//将指定的组件添加到此容器的尾部
      add(
            new JLabel(
                  "<html><h1><i>Core Java</i></h1><hr>By Cay Horstmann</html>"),
            BorderLayout.CENTER);

      // OK button closes the dialog

      JButton ok = new JButton("OK");//创建一个新的按钮
      ok.addActionListener(event -> setVisible(false));

      // add OK button to southern border

      JPanel panel = new JPanel();
      panel.add(ok);
      add(panel, BorderLayout.SOUTH);//边框布局，显示在下边

      pack();
   }
}

package dataExchange;

import java.awt.*;
import javax.swing.*;

/**
 * @version 1.34 2015-06-12
 * @author Cay Horstmann
 */
public class DataExchangeTest {
    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            JFrame frame = new DataExchangeFrame();
            frame.setTitle("DataExchangeTest");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
        });
    }
}

package dataExchange;

/**
 * A user has a name and password. For security reasons, the password is stored
 * as a char[], not a String.
 */
public class User {
    private String name;
    private char[] password;

    public User(String aName, char[] aPassword) {
        name = aName;
        password = aPassword;
    }

    public String getName() {
        return name;
    }

    public char[] getPassword() {
        return password;
    }

    public void setName(String aName) {
        name = aName;
    }

    public void setPassword(char[] aPassword) {
        password = aPassword;
    }
}

package dataExchange;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
 * A frame with a menu whose File->Connect action shows a password dialog.
 */
public class DataExchangeFrame extends JFrame {
    public static final int TEXT_ROWS = 20;
    public static final int TEXT_COLUMNS = 40;
    private PasswordChooser dialog = null;
    private JTextArea textArea;

    public DataExchangeFrame() {
        // construct a File menu

        JMenuBar mbar = new JMenuBar();
        setJMenuBar(mbar);
        JMenu fileMenu = new JMenu("File");
        mbar.add(fileMenu);

        // add Connect and Exit menu items

        JMenuItem connectItem = new JMenuItem("Connect");
        connectItem.addActionListener(new ConnectAction());
        fileMenu.add(connectItem);

        // The Exit item exits the program

        JMenuItem exitItem = new JMenuItem("Exit");
        exitItem.addActionListener(event -> System.exit(0));
        fileMenu.add(exitItem);

        textArea = new JTextArea(TEXT_ROWS, TEXT_COLUMNS);
        add(new JScrollPane(textArea), BorderLayout.CENTER);
        pack();
    }

    /**
     * The Connect action pops up the password dialog.
     */
    private class ConnectAction implements ActionListener {
        public void actionPerformed(ActionEvent event) {
            // if first time, construct dialog

            if (dialog == null)
                dialog = new PasswordChooser();

            // set default values
            dialog.setUser(new User("yourname", null));

            // pop up dialog
            if (dialog.showDialog(DataExchangeFrame.this, "Connect")) {
                // if accepted, retrieve user input
                User u = dialog.getUser();
                textArea.append("user name = " + u.getName() + ", password = " + (new String(u.getPassword())) + "\n");
            }
        }
    }
}

package dataExchange;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Frame;
import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

/**
 * A password chooser that is shown inside a dialog
 */
public class PasswordChooser extends JPanel {
    private JTextField username;
    private JPasswordField password;
    private JButton okButton;
    private boolean ok;
    private JDialog dialog;

    public PasswordChooser() {
        setLayout(new BorderLayout());

        // construct a panel with user name and password fields

        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(2, 2));
        panel.add(new JLabel("User name:"));
        panel.add(username = new JTextField(""));
        panel.add(new JLabel("Password:"));
        panel.add(password = new JPasswordField(""));
        add(panel, BorderLayout.CENTER);

        // create Ok and Cancel buttons that terminate the dialog

        okButton = new JButton("Ok");
        okButton.addActionListener(event -> {
            ok = true;
            dialog.setVisible(false);
        });

        JButton cancelButton = new JButton("Cancel");
        cancelButton.addActionListener(event -> dialog.setVisible(false));

        // add buttons to southern border

        JPanel buttonPanel = new JPanel();
        buttonPanel.add(okButton);
        buttonPanel.add(cancelButton);
        add(buttonPanel, BorderLayout.SOUTH);
    }

    /**
     * Sets the dialog defaults.
     * 
     * @param u the default user information
     */
    public void setUser(User u) {
        username.setText(u.getName());
    }

    /**
     * Gets the dialog entries.
     * 
     * @return a User object whose state represents the dialog entries
     */
    public User getUser() {
        return new User(username.getText(), password.getPassword());
    }

    /**
     * Show the chooser panel in a dialog
     * 
     * @param parent a component in the owner frame or null
     * @param title  the dialog window title
     */
    public boolean showDialog(Component parent, String title) {
        ok = false;

        // locate the owner frame

        Frame owner = null;
        if (parent instanceof Frame)
            owner = (Frame) parent;
        else
            owner = (Frame) SwingUtilities.getAncestorOfClass(Frame.class, parent);

        // if first time, or if owner has changed, make new dialog

        if (dialog == null || dialog.getOwner() != owner) {
            dialog = new JDialog(owner, true);
            dialog.add(this);
            dialog.getRootPane().setDefaultButton(okButton);
            dialog.pack();
        }

        // set title and show dialog

        dialog.setTitle(title);
        dialog.setVisible(true);
        return ok;
    }
}

package fileChooser;

import java.awt.*;
import javax.swing.*;

/**
 * @version 1.25 2015-06-12
 * @author Cay Horstmann
 */
public class FileChooserTest {
    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            JFrame frame = new ImageViewerFrame();
            frame.setTitle("FileChooserTest");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
        });
    }
}

package fileChooser;

import java.io.*;
import javax.swing.*;
import javax.swing.filechooser.*;
import javax.swing.filechooser.FileFilter;

/**
 * A file view that displays an icon for all files that match a file filter.
 */
public class FileIconView extends FileView {
    private FileFilter filter;
    private Icon icon;

    /**
     * Constructs a FileIconView.
     * 
     * @param aFilter a file filter--all files that this filter accepts will be
     *                shown with the icon.
     * @param         anIcon--the icon shown with all accepted files.
     */
    public FileIconView(FileFilter aFilter, Icon anIcon) {
        filter = aFilter;
        icon = anIcon;
    }

    public Icon getIcon(File f) {
        if (!f.isDirectory() && filter.accept(f))
            return icon;
        else
            return null;
    }
}

package fileChooser;

import java.awt.*;
import java.io.*;

import javax.swing.*;

/**
 * A file chooser accessory that previews images.
 */
public class ImagePreviewer extends JLabel {
    /**
     * Constructs an ImagePreviewer.
     * 
     * @param chooser the file chooser whose property changes trigger an image
     *                change in this previewer
     */
    public ImagePreviewer(JFileChooser chooser) {
        setPreferredSize(new Dimension(100, 100));
        setBorder(BorderFactory.createEtchedBorder());

        chooser.addPropertyChangeListener(event -> {
            if (event.getPropertyName() == JFileChooser.SELECTED_FILE_CHANGED_PROPERTY) {
                // the user has selected a new file
                File f = (File) event.getNewValue();
                if (f == null) {
                    setIcon(null);
                    return;
                }

                // read the image into an icon
                ImageIcon icon = new ImageIcon(f.getPath());

                // if the icon is too large to fit, scale it
                if (icon.getIconWidth() > getWidth())
                    icon = new ImageIcon(icon.getImage().getScaledInstance(getWidth(), -1, Image.SCALE_DEFAULT));

                setIcon(icon);
            }
        });
    }
}

package fileChooser;

import java.io.*;

import javax.swing.*;
import javax.swing.filechooser.*;
import javax.swing.filechooser.FileFilter;

/**
 * A frame that has a menu for loading an image and a display area for the
 * loaded image.
 */
public class ImageViewerFrame extends JFrame {
    private static final int DEFAULT_WIDTH = 300;
    private static final int DEFAULT_HEIGHT = 400;
    private JLabel label;
    private JFileChooser chooser;

    public ImageViewerFrame() {
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

        // set up menu bar
        JMenuBar menuBar = new JMenuBar();
        setJMenuBar(menuBar);

        JMenu menu = new JMenu("File");
        menuBar.add(menu);

        JMenuItem openItem = new JMenuItem("Open");
        menu.add(openItem);
        openItem.addActionListener(event -> {
            chooser.setCurrentDirectory(new File("."));

            // show file chooser dialog
            int result = chooser.showOpenDialog(ImageViewerFrame.this);

            // if image file accepted, set it as icon of the label
            if (result == JFileChooser.APPROVE_OPTION) {
                String name = chooser.getSelectedFile().getPath();
                label.setIcon(new ImageIcon(name));
                pack();
            }
        });

        JMenuItem exitItem = new JMenuItem("Exit");
        menu.add(exitItem);
        exitItem.addActionListener(event -> System.exit(0));

        // use a label to display the images
        label = new JLabel();
        add(label);

        // set up file chooser
        chooser = new JFileChooser();

        // accept all image files ending with .jpg, .jpeg, .gif
        FileFilter filter = new FileNameExtensionFilter("Image files", "jpg", "jpeg", "gif");
        chooser.setFileFilter(filter);

        chooser.setAccessory(new ImagePreviewer(chooser));

        chooser.setFileView(new FileIconView(filter, new ImageIcon("palette.gif")));
    }
}

package colorChooser;

import java.awt.*;
import javax.swing.*;

/**
 * @version 1.04 2015-06-12
 * @author Cay Horstmann
 */
public class ColorChooserTest {
    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            JFrame frame = new ColorChooserFrame();
            frame.setTitle("ColorChooserTest");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
        });
    }
}

package colorChooser;

import javax.swing.*;

/**
 * A frame with a color chooser panel
 */
public class ColorChooserFrame extends JFrame {
    private static final int DEFAULT_WIDTH = 300;
    private static final int DEFAULT_HEIGHT = 200;

    public ColorChooserFrame() {
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

        // add color chooser panel to frame

        ColorChooserPanel panel = new ColorChooserPanel();
        add(panel);
    }
}

package colorChooser;

import java.awt.Color;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JDialog;
import javax.swing.JPanel;

/**
 * A panel with buttons to pop up three types of color choosers
 */
public class ColorChooserPanel extends JPanel {
    public ColorChooserPanel() {
        JButton modalButton = new JButton("Modal");
        modalButton.addActionListener(new ModalListener());
        add(modalButton);

        JButton modelessButton = new JButton("Modeless");
        modelessButton.addActionListener(new ModelessListener());
        add(modelessButton);

        JButton immediateButton = new JButton("Immediate");
        immediateButton.addActionListener(new ImmediateListener());
        add(immediateButton);
    }

    /**
     * This listener pops up a modal color chooser
     */
    private class ModalListener implements ActionListener {
        public void actionPerformed(ActionEvent event) {
            Color defaultColor = getBackground();
            Color selected = JColorChooser.showDialog(ColorChooserPanel.this, "Set background", defaultColor);
            if (selected != null)
                setBackground(selected);
        }
    }

    /**
     * This listener pops up a modeless color chooser. The panel color is changed
     * when the user clicks the OK button.
     */
    private class ModelessListener implements ActionListener {
        private JDialog dialog;
        private JColorChooser chooser;

        public ModelessListener() {
            chooser = new JColorChooser();
            dialog = JColorChooser.createDialog(ColorChooserPanel.this, "Background Color", false /* not modal */,
                    chooser, event -> setBackground(chooser.getColor()), null /* no Cancel button listener */);
        }

        public void actionPerformed(ActionEvent event) {
            chooser.setColor(getBackground());
            dialog.setVisible(true);
        }
    }

    /**
     * This listener pops up a modeless color chooser. The panel color is changed
     * immediately when the user picks a new color.
     */
    private class ImmediateListener implements ActionListener {
        private JDialog dialog;
        private JColorChooser chooser;

        public ImmediateListener() {
            chooser = new JColorChooser();
            chooser.getSelectionModel().addChangeListener(event -> setBackground(chooser.getColor()));

            dialog = new JDialog((Frame) null, false /* not modal */);
            dialog.add(chooser);
            dialog.pack();
        }

        public void actionPerformed(ActionEvent event) {
            chooser.setColor(getBackground());
            dialog.setVisible(true);
        }
    }
}