Swing的GroupLayout示例

说明

GroupLayout 类分级组，才能在容器内放置它们的组件。

代码示例

package com.yiidian;

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

public class SwingTester {
   public static void main(String[] args) {
      createWindow();
   }

   private static void createWindow() {    
      JFrame frame = new JFrame("一点教程网：Swing Tester");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      createUI(frame);
      frame.setSize(560, 200);      
      frame.setLocationRelativeTo(null);  
      frame.setVisible(true);
   }

   private static void createUI(final JFrame frame){  
      JPanel panel = new JPanel();
      GroupLayout layout = new GroupLayout(panel);
      layout.setAutoCreateGaps(true);
      layout.setAutoCreateContainerGaps(true);
      
      JButton btn1 = new JButton("Button 1");
      JButton btn2 = new JButton("Button 2");
      JButton btn3 = new JButton("Button 3");

      layout.setHorizontalGroup(layout.createSequentialGroup()
         .addComponent(btn1)
         .addGroup(layout.createSequentialGroup()
         .addGroup(layout.createParallelGroup(
         GroupLayout.Alignment.LEADING)
         .addComponent(btn2)
         .addComponent(btn3))));
   
      layout.setVerticalGroup(layout.createSequentialGroup()
         .addComponent(btn1)
         .addComponent(btn2)
         .addComponent(btn3));
      
      panel.setLayout(layout);       
      frame.getContentPane().add(panel, BorderLayout.CENTER);
   }
}

执行效果如下：