Java Swing GridBagLayout网格袋布局的实现

package com.xiets.swing;

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

public class Main {

 public static void main(String[] args) {
  JFrame jf = new JFrame("测试窗口");
  jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

  GridBagLayout gridBag = new GridBagLayout(); // 布局管理器
  GridBagConstraints c = null;     // 约束

  JPanel panel = new JPanel(gridBag);

  JButton btn01 = new JButton("Button01");
  JButton btn02 = new JButton("Button02");
  JButton btn03 = new JButton("Button03");
  JButton btn04 = new JButton("Button04");
  JButton btn05 = new JButton("Button05");
  JButton btn06 = new JButton("Button06");
  JButton btn07 = new JButton("Button07");
  JButton btn08 = new JButton("Button08");
  JButton btn09 = new JButton("Button09");
  JButton btn10 = new JButton("Button10");

  /* 添加 组件 和 约束 到 布局管理器 */
  // Button01
  c = new GridBagConstraints();
  gridBag.addLayoutComponent(btn01, c); // 内部使用的仅是 c 的副本

  // Button02
  c = new GridBagConstraints();
  gridBag.addLayoutComponent(btn02, c);

  // Button03
  c = new GridBagConstraints();
  gridBag.addLayoutComponent(btn03, c);

  // Button04 显示区域占满当前行剩余空间（换行），组件填充显示区域
  c = new GridBagConstraints();
  c.gridwidth = GridBagConstraints.REMAINDER;
  c.fill = GridBagConstraints.BOTH;
  gridBag.addLayoutComponent(btn04, c);

  // Button05 显示区域独占一行（换行），组件填充显示区域
  c = new GridBagConstraints();
  c.gridwidth = GridBagConstraints.REMAINDER;
  c.fill = GridBagConstraints.BOTH;
  gridBag.addLayoutComponent(btn05, c);

  // Button06 显示区域占到当前尾倒车第二个单元格（下一个组件后需要手动换行），组件填充显示区域
  c = new GridBagConstraints();
  c.gridwidth = GridBagConstraints.RELATIVE;
  c.fill = GridBagConstraints.BOTH;
  gridBag.addLayoutComponent(btn06, c);

  // Button07 放置在当前行最后一个单元格（换行）
  c = new GridBagConstraints();
  c.gridwidth = GridBagConstraints.REMAINDER;
  gridBag.addLayoutComponent(btn07, c);

  // Button08 显示区域占两列，组件填充显示区域
  c = new GridBagConstraints();
  c.gridheight = 2;
  c.fill = GridBagConstraints.BOTH;
  gridBag.addLayoutComponent(btn08, c);

  // Button09 显示区域占满当前行剩余空间（换行），组件填充显示区域
  c = new GridBagConstraints();
  c.gridwidth = GridBagConstraints.REMAINDER;
  c.fill = GridBagConstraints.BOTH;
  gridBag.addLayoutComponent(btn09, c);

  // Button10 显示区域占满当前行剩余空间（换行），组件填充显示区域
  c = new GridBagConstraints();
  c.gridwidth = GridBagConstraints.REMAINDER;
  c.fill = GridBagConstraints.BOTH;
  gridBag.addLayoutComponent(btn10, c);

  /* 添加 组件 到 内容面板 */
  panel.add(btn01);
  panel.add(btn02);
  panel.add(btn03);
  panel.add(btn04);
  panel.add(btn05);
  panel.add(btn06);
  panel.add(btn07);
  panel.add(btn08);
  panel.add(btn09);
  panel.add(btn10);

  jf.setContentPane(panel);
  jf.pack();
  jf.setLocationRelativeTo(null);
  jf.setVisible(true);
 }

}