GUI（GroupLayout 分组布局）

组：一些组件的集合

                      连续组：一个接着一个摆放

                      并行组：一个组在另一个组的顶部

                      水平方向：连续组b1,b2.并行组g1{b3,b4}

                       垂直方向：连续组{b1,b2,b3},b4  

效果图：

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代码：

/**

 *

 */

package com.niit.javagui;

import javax.swing.GroupLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

/**

 * @author: Annie

 * @date:2016年5月31日

 * @description:

 */

public class GroupLayoutDemo extends JFrame{

    JButton b1,b2,b3,b4;

    public GroupLayoutDemo() {

        setVisible(true);

        setSize(400,400);

        setTitle("GroupLayoutDemo");

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        GroupLayout layout = new GroupLayout(getContentPane());

        setLayout(layout);

        b1 = new JButton("b1");

        b2 = new JButton("b2");

        b3 = new JButton("b3");

        b4 = new JButton("b4");

        //创建一个连续组对象 作为水平方向的布局

        GroupLayout.SequentialGroup sg1 = layout.createSequentialGroup();

        sg1.addComponent(b1);

        sg1.addComponent(b2);

        //b3和b4并行的小组

        GroupLayout.ParallelGroup pg1=layout.createParallelGroup();

        pg1.addComponent(b3);

        pg1.addComponent(b4);

        sg1.addGroup(pg1);

        //指定水平方向布局是sg1

        layout.setHorizontalGroup(sg1);

        GroupLayout.SequentialGroup sg2 = layout.createSequentialGroup();

        GroupLayout.ParallelGroup pg2=layout.createParallelGroup();

        pg2.addComponent(b1);

        pg2.addComponent(b2);

        pg2.addComponent(b3);

        sg2.addGroup(pg2);

        sg2.addComponent(b4);

        layout.setVerticalGroup(sg2);

    }

    public static void main(String[] args) {

        new GroupLayoutDemo();

    }

}