javaSE第二十五天

import java.awt.Frame;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

?

public?class FrameDemo {

????public?static?void main(String[] args) {

????????// 创建窗体对象

????????JFrame f = new JFrame("窗体关闭案例");

?

????????// 设置窗体属性

????????f.setBounds(400, 200, 400, 300);

?

????????//用适配器类改进

????????f.addWindowListener(new?WindowAdapter() {

????????????@Override

????????????public?void?windowClosing(WindowEvent e) {

????????????????System.exit(0);

????????????}

????????});

?

????????// 设置窗体可见

????????f.setVisible(true);

????}

}

/*

* 顶层接口：针对用户操作的四种功能

*/

public?interface UserDao {

????public?abstract?void add();

?

????public?abstract?void delete();

?

????public?abstract?void update();

?

????public?abstract?void find();

}

/*

* 定义一个类实现UserDao接口：当然啦，是空实现

*/

public?abstract?class UserAdapter implements UserDao {

?

????@Override

????public?void add() {

????}

?

????@Override

????public?void delete() {

????}

?

????@Override

????public?void update() {

????}

?

????@Override

????public?void find() {

????}

}

/*

* 具体实现类：继承UserAdapter适配器类，重写里面

* ????????????自己想要使用的方法

*/

public?class UserDaoImpl extends UserAdapter {

????@Override

????public?void add() {

????????System.out.println("添加功能");

????}

}

/*

* 问题：

* ????????接口(方法比较多) -- 实现类(仅仅使用一个，也得把其他的实现给提供了，哪怕是空实现)

* ????????太麻烦了。

* 解决方案：

* ????????接口(方法比较多) -- 适配器类(实现接口,仅仅空实现) -- 实现类(用哪个重写哪个)

*/

public?class UserDaoDemo {

????public?static?void main(String[] args) {

????????UserDao ud = new UserDaoImpl();

????????ud.add();

????????// 我没有说我们需要四种功能都实现啊。

????????UserDao ud2 = new UserDaoImpl2();

????????ud2.add();

????}

}

import javax.swing.JFrame;

/*

* 需求：创建一个窗体（该窗体默认情况下是不能关闭的）

*/

public?class FrameDemo {

????public?static?void main(String[] args) {

????????// 创建窗体对象

????????// Frame f = new Frame();

????????// Frame(String title)

????????JFrame f = new JFrame("林青霞");

?

????????// 设置窗体标题

????????f.setTitle("HelloWorld");

????????// 设置窗体大小

????????f.setSize(400, 300); // 单位：像素

????????// 设置窗体位置

????????f.setLocation(400, 200);

?

????????// 调用一个方法，设置让窗体可见

????????// f.show();

????????f.setVisible(true);

?

????????// System.out.println("helloworld");

????}

}

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import javax.swing.JFrame;

/*

* 需求：创建一个窗体（该窗体可以直接被关闭的）

*/

public?class FrameDemo {

????public?static?void main(String[] args) {

????????// 创建窗体对象

????????JFrame f = new JFrame("窗体关闭案例");

?

????????// 设置窗体属性

????????f.setBounds(400, 200, 400, 300);

????????

????????//用适配器类改进，为窗体添加监听机制

????????f.addWindowListener(new WindowAdapter() {

????????????@Override

????????????public?void windowClosing(WindowEvent e) {

????????????????System.exit(0);

????????????}

????????});

?

????????// 设置窗体可见

????????f.setVisible(true);

????}

}

import java.awt.Button;

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

?

import?javax.swing.JFrame;

?

/*

* 需求：把按钮添加到窗体，并对按钮添加一个点击事件。

* A：创建窗体对象

* B:创建按钮对象

* C:把按钮添加到窗体

* D:窗体显示

*/

public?class FrameDemo {

????public?static?void main(String[] args) {

????????// 创建窗体对象

????????JFrame?f = new?JFrame("添加按钮");

????????// 设置属性

????????f.setBounds(400, 200, 400, 300);

????????// 设置布局为流式布局

????????f.setLayout(new FlowLayout());

?

????????// 创建按钮对象

????????Button bu = new Button("点我啊");

????????// bu.setSize(20, 10);

?

????????// 把按钮添加到窗体

????????f.add(bu);

?

????????// 设置窗体可以关闭

????????f.addWindowListener(new WindowAdapter() {

????????????@Override

????????????public?void windowClosing(WindowEvent e) {

????????????????System.exit(0);

????????????}

????????});

?

????????bu.addActionListener(new ActionListener() {

????????????@Override

????????????public?void actionPerformed(ActionEvent e) {

????????????????System.out.println("你再点试试");

????????????}

????????});

?

????????// 窗体显示

????????f.setVisible(true);

????}

}

import java.awt.Button;

import java.awt.FlowLayout;

import java.awt.TextArea;

import java.awt.TextField;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

?

import javax.swing.JFrame;

/*

* 需求：将文本框中的数据转移到文本域中

*/

public?class FrameDemo {

????public?static?void main(String[] args) {

????????// 创建窗体对象

????????JFrame f = new JFrame("数据转移");

????????// 设置窗体属性和布局

????????f.setBounds(400, 200, 400, 300);

????????f.setLayout(new FlowLayout());

?

????????// 创建文本框

????????final TextField tf = new TextField(20);

????????// 创建按钮

????????Button bu = new Button("数据转移");

????????// 创建文本域

????????final TextArea ta = new TextArea(10, 40);

?

????????// 把组件添加到窗体

????????f.add(tf);

????????f.add(bu);

????????f.add(ta);

?

????????// 设置窗体关闭

????????f.addWindowListener(new WindowAdapter() {

????????????@Override

????????????public?void windowClosing(WindowEvent e) {

????????????????System.exit(0);

????????????}

????????});

?

????????// 对按钮添加事件

????????bu.addActionListener(new ActionListener() {

????????????@Override

????????????public?void actionPerformed(ActionEvent e) {

????????????????// 获取文本框的值

????????????????String tf_str = tf.getText().trim();

????????????????// 清空数据

????????????????tf.setText("");

?

????????????????// 设置给文本域

????????????????// ta.setText(tf_str);

????????????????// 追加和换行

????????????????ta.append(tf_str + "\r\n");

????????????????

????????????????//获取光标

????????????????tf.requestFocus();

????????????}

????????});

?

????????// 设置窗体显示

????????f.setVisible(true);

????}

}

import java.awt.Button;

import java.awt.Color;

import java.awt.FlowLayout;

import?java.awt.Frame;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

/*

* 需求：更改背景色

*/

public?class FrameDemo {

????public?static?void main(String[] args) {

????????// 创建窗体对象，局部内部类访问局部变量，局部变量必须用final修饰

????????final?Frame?f = new?Frame("更改背景色");

????????// 设置窗体属性和布局

????????f.setBounds(400, 200, 400, 300);

????????f.setLayout(new FlowLayout());

?

????????// 创建四个按钮

????????Button redButton = new Button("红色");

????????Button greenButton = new Button("绿色");

????????Button buleButton = new Button("蓝色");

?

????????// 添加按钮

????????f.add(redButton);

????????f.add(greenButton);

????????f.add(buleButton);

?

????????// 设置窗体关闭

????????f.addWindowListener(new WindowAdapter() {

????????????@Override

????????????public?void windowClosing(WindowEvent e) {

????????????????System.exit(0);

????????????}

????????});

?

????????// 对按钮添加动作事件

????????// redButton.addActionListener(new ActionListener() {

????????// @Override

????????// public void actionPerformed(ActionEvent e) {

????????// f.setBackground(Color.RED);

????????// }

????????// });

?

????????// 对按钮添加鼠标点击事件

????????// redButton.addMouseListener(new MouseAdapter() {

????????// @Override

????????// public void mouseClicked(MouseEvent e) {

????????// f.setBackground(Color.RED);

????????// }

????????// });

?

????????// 对按钮添加鼠标的进入事件

????????redButton.addMouseListener(new MouseAdapter() {

????????????@Override

????????????public?void mouseEntered(MouseEvent e) {

????????????????f.setBackground(Color.RED);

????????????}

????????});

????????// 对按钮添加鼠标的离开事件

????????redButton.addMouseListener(new MouseAdapter() {

????????????@Override

????????????public?void mouseExited(MouseEvent e) {

????????????????f.setBackground(Color.WHITE);

????????????}

????????});

?

????????greenButton.addMouseListener(new MouseAdapter() {

????????????@Override

????????????public?void mouseEntered(MouseEvent e) {

????????????????f.setBackground(Color.GREEN);

????????????}

????????});

?

????????greenButton.addMouseListener(new MouseAdapter() {

????????????@Override

????????????public?void mouseExited(MouseEvent e) {

????????????????f.setBackground(Color.WHITE);

????????????}

????????});

?

????????buleButton.addMouseListener(new MouseAdapter() {

????????????@Override

????????????public?void mouseEntered(MouseEvent e) {

????????????????f.setBackground(Color.BLUE);

????????????}

????????});

?

????????buleButton.addMouseListener(new MouseAdapter() {

????????????@Override

????????????public?void mouseExited(MouseEvent e) {

????????????????f.setBackground(Color.WHITE);

????????????}

????????});

?

????????// 设置窗体显示

????????f.setVisible(true);

????}

}

import java.awt.FlowLayout;

import?java.awt.Frame;

import java.awt.Label;

import java.awt.TextField;

import java.awt.event.KeyAdapter;

import java.awt.event.KeyEvent;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

?

/*

* 需求：你输入的如果是非数字字符，就取消你键盘录入的效果。

*/

public?class FrameDemo {

????public?static?void main(String[] args) {

????????// 创建窗体对象并设置属性

????????Frame?f = new?Frame("不能输入非数字字符");

????????f.setBounds(400, 200, 400, 300);

????????f.setLayout(new FlowLayout());

?

????????// 创建Label标签对象

????????Label label = new Label("请输入你的QQ号码，不能是非数字，不信你试试");

????????TextField tf = new TextField(40);

?

????????// 添加到窗体上

????????f.add(label);

????????f.add(tf);

?

????????// 设置窗体关闭

????????f.addWindowListener(new WindowAdapter() {

????????????@Override

????????????public?void windowClosing(WindowEvent e) {

????????????????System.exit(0);

????????????}

????????});

?

????????// 给文本框添加事件

????????tf.addKeyListener(new KeyAdapter() {

????????????@Override

????????????public?void keyPressed(KeyEvent e) {

????????????????// 如果你取得的字符不是数字字符就取消事件

????????????????// 思路：先获取字符，判断字符，取消事件

????????????????// char getKeyChar()

????????????????char?ch = e.getKeyChar();

????????????????// System.out.println(ch);

????????????????if (!(ch >= ‘0‘ && ch <= ‘9‘)) {

????????????????????e.consume();

????????????????}

????????????}

????????});

?

????????// 设置窗体可见

????????f.setVisible(true);

????}

}

import java.awt.FlowLayout;

import java.awt.Frame;

import java.awt.Menu;

import java.awt.MenuBar;

import java.awt.MenuItem;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

?

/*

* 需求：制作一级菜单

*/

public?class FrameDemo {

????public?static?void main(String[] args) {

????????// 创建窗体对象并设置属性

????????Frame f = new Frame("一级菜单");

????????f.setBounds(400, 200, 400, 300);

????????f.setLayout(new FlowLayout());

?

????????// 创建菜单栏

????????MenuBar mb = new MenuBar();

????????// 创建菜单

????????Menu m = new Menu("文件");

????????// 创建菜单项

????????MenuItem mi = new MenuItem("退出系统");

?

????????// 谁添加谁呢

????????m.add(mi);

????????mb.add(m);

?

????????// 设置菜单栏

????????f.setMenuBar(mb);

?

????????// 设置窗体关闭

????????f.addWindowListener(new WindowAdapter() {

????????????@Override

????????????public?void windowClosing(WindowEvent e) {

????????????????System.exit(0);

????????????}

????????});

?

????????mi.addActionListener(new ActionListener() {

????????????@Override

????????????public?void actionPerformed(ActionEvent e) {

????????????????System.exit(0);

????????????}

????????});

?

????????// 设置窗体可见

????????f.setVisible(true);

????}

}

import java.awt.FlowLayout;

import java.awt.Frame;

import java.awt.Menu;

import java.awt.MenuBar;

import java.awt.MenuItem;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.io.IOException;

?

/*

* 需求：制作多级菜单

*/

public?class FrameDemo {

????public?static?void main(String[] args) {

????????// 创建窗体对象并设置属性

????????final Frame f = new Frame("多级菜单");

????????f.setBounds(400, 200, 400, 300);

????????f.setLayout(new FlowLayout());

????????

????????final String name = f.getTitle();

?

????????// 创建菜单栏

????????MenuBar mb = new MenuBar();

????????// 创建菜单

????????Menu m1 = new Menu("文件");

????????Menu m2 = new Menu("更改名称");

????????// 创建菜单项

????????final MenuItem mi1 = new MenuItem("好好学习");

????????final MenuItem mi2 = new MenuItem("天天向上");

????????MenuItem mi3 = new MenuItem("恢复标题");

????????MenuItem mi4 = new MenuItem("打开记事本");

????????MenuItem mi5 = new MenuItem("退出系统");

?

????????// 谁添加谁呢

????????m2.add(mi1);

????????m2.add(mi2);

????????m2.add(mi3);

????????

????????m1.add(m2);

????????m1.add(mi4);

????????m1.add(mi5);

????????

????????mb.add(m1);

?

????????// 设置菜单栏

????????f.setMenuBar(mb);

?

????????// 设置窗体关闭

????????f.addWindowListener(new WindowAdapter() {

????????????@Override

????????????public?void windowClosing(WindowEvent e) {

????????????????System.exit(0);

????????????}

????????});

????????

????????mi1.addActionListener(new ActionListener() {

????????????@Override

????????????public?void actionPerformed(ActionEvent e) {

????????????????f.setTitle(mi1.getLabel());

????????????}

????????});

????????

????????mi2.addActionListener(new ActionListener() {

????????????@Override

????????????public?void actionPerformed(ActionEvent e) {

????????????????f.setTitle(mi2.getLabel());

????????????}

????????});

????????

????????mi3.addActionListener(new ActionListener() {

????????????@Override

????????????public?void actionPerformed(ActionEvent e) {

????????????????f.setTitle(name);

????????????}

????????});

????????

????????mi4.addActionListener(new ActionListener() {

????????????@Override

????????????public?void actionPerformed(ActionEvent e) {

????????????????Runtime r = Runtime.getRuntime();

????????????????try {

????????????????????r.exec("notepad");

????????????????} catch (IOException e1) {

????????????????????e1.printStackTrace();

????????????????}

????????????}

????????});

?

????????mi5.addActionListener(new ActionListener() {

????????????@Override

????????????public?void actionPerformed(ActionEvent e) {

????????????????System.exit(0);

????????????}

????????});

?

????????// 设置窗体可见

????????f.setVisible(true);

????}

}