练习面板的嵌套，实现窗口的任意布局

将面板嵌套，添加到窗口中，达到完美的布局效果

 

 实现代码如下：

public class Test {
    public static void main(String[] args) {
        //总  Frame
        Frame frame = new Frame();

        frame.setSize(400,300);
        frame.setLocation(300,400);
        frame.setBackground(Color.blue);
        frame.setVisible(true);
        frame.setLayout(new GridLayout(2,1));

        //定义四个面板
        Panel p1 = new Panel(new BorderLayout());
        Panel p2 = new Panel(new GridLayout(2,1));
        Panel p3 = new Panel(new BorderLayout());
        Panel p4 = new Panel(new GridLayout(2,2));

        //上面部分
       p1.add(new Button("east-1"),BorderLayout.EAST);
       p1.add(new Button("west-1"),BorderLayout.WEST);
       p2.add(new Button("1"));
       p2.add(new Button("2"));
       p1.add(p2,BorderLayout.CENTER);

       //下面部分
        p3.add(new Button("east-2"),BorderLayout.EAST);
        p3.add(new Button("west-2"),BorderLayout.WEST);

        //中间4个
        for (int i = 3; i < 7; i++) {
            p4.add(new Button(""+i));

        }
//        p4.add(new Button("3"));
//        p4.add(new Button("4"));
//        p4.add(new Button("5"));
//        p4.add(new Button("6"));
        p3.add(p4,BorderLayout.CENTER);

        frame.add(p1);
        frame.add(p3);







        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}