Swing-BoxLayout用法-入门

JPanel panel=new JPanel(); 
BoxLayout layout=new BoxLayout(panel, BoxLayout.X_AXIS); 
panel.setLayout(layoout); 
panel.add(new JButton("hello"));
panel.add(new JButton("wolrd"));

import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;

public class BoxLayoutDemo extends JPanel {

    JPanel sportPanel;
    JPanel queryPanel;
    JPanel middlePanel;

    public BoxLayoutDemo() {
        // 主面板由3个子面板组成，在水平方向排列
        setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
        this.setSportPanel();
        this.setMiddlePanel();
        this.setQueryPanel();

        this.add(sportPanel);
        this.add(middlePanel);
        this.add(queryPanel);
    }

    private void setSportPanel() {
        System.out.println("setSportPanel called");
        //本函数内包含以下两个控件
        JLabel sourceLabel;//文字标签
        JScrollPane sourceListScroller;//滚动条

        //文字标签
        sourceLabel = new JLabel("运动项目");
        sourceLabel.setAlignmentY(TOP_ALIGNMENT);
        sourceLabel.setBorder(BorderFactory.createEmptyBorder(4, 5, 0, 5));
        
        // 创建一个列表，包含运动项目
        DefaultListModel<String> listModel = new DefaultListModel<String>();
        listModel.addElement("100米");
        listModel.addElement("200米");
        listModel.addElement("400米");
        listModel.addElement("跳远");
        listModel.addElement("跳高");
        listModel.addElement("铅球");
        
        JList<String> sourceList = new JList<String>(listModel);
        sourceList
                .setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
        sourceList.setVisibleRowCount(5);//初始状态保持5行可见

        //滚动条
        sourceListScroller = new JScrollPane(sourceList);
        sourceListScroller
                .setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        sourceListScroller.setAlignmentY(TOP_ALIGNMENT);
        
        //开始布局主面板
        sportPanel = new JPanel();        
        sportPanel.setLayout(new BoxLayout(sportPanel, BoxLayout.Y_AXIS));// 垂直布局
        sportPanel.setBorder(BorderFactory.createBevelBorder(1));
        
        sportPanel.add(sourceLabel);// 加入文字标签到
        sportPanel.add(sourceListScroller);// 加入运动项目列表

    }

    private void setMiddlePanel() {
        //本函数包含2个按钮
        JButton toTargetButton = new JButton(">>");
        JButton toSourceButton = new JButton("<<");

        //布局主面板
        middlePanel = new JPanel();
        middlePanel.setBorder(BorderFactory.createBevelBorder(1));
        middlePanel.setLayout(new BoxLayout(middlePanel, BoxLayout.Y_AXIS));//主面板为垂直布局
        
        middlePanel.add(toTargetButton);// 添加第一个按钮>>
        middlePanel.add(Box.createRigidArea(new Dimension(15, 15)));// 中间添加一个看不见的rigidArea
        middlePanel.add(toSourceButton);// 添加第二个按钮<<
    }

    private void setQueryPanel() {
        
        //本函数包含2个控件
        JLabel targetLabel;
        JScrollPane targetListScroller;
        
        // 文字标签
        targetLabel = new JLabel("查询项目");
        targetLabel.setAlignmentY(TOP_ALIGNMENT);
        targetLabel.setBorder(BorderFactory.createEmptyBorder(4, 5, 0, 5));
        
        // 创建列表查询项目
        DefaultListModel<String> targetListModel = new DefaultListModel<String>();
        targetListModel.addElement("100米");
        JList<String> targetList = new JList<String>(targetListModel);
        targetList
                .setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
        
        //滚动条
        targetListScroller = new JScrollPane(targetList);
        targetListScroller
                .setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        targetListScroller.setAlignmentY(TOP_ALIGNMENT);


        //设置主面板布局
        queryPanel = new JPanel();        
        queryPanel.setLayout(new BoxLayout(queryPanel, BoxLayout.Y_AXIS));// 垂直布局
        queryPanel.setBorder(BorderFactory.createBevelBorder(1));


        queryPanel.add(targetLabel);//添加文字标签
        queryPanel.add(targetListScroller);//添加滚动条
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("BoxlayoutDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(new BoxLayoutDemo());
        frame.pack();
        // frame.repaint();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

}