Java Swing组件BoxLayout布局用法示例

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"));

package awtDemo;
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;
@SuppressWarnings("serial")
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 - www.jb51.net");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setContentPane(new BoxLayoutDemo());
    frame.pack();
    // frame.repaint();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }
}