布局练习

package com.dong.lesson01;

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

//练习的Dome讲解
public class ExDome {
    public static void main(String[] args) {
        //总 Frame
        Frame frame = new Frame();

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

        //4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ok
        p1.add(new Button("east-1"),BorderLayout.EAST);
        p1.add(new Button("west-2"),BorderLayout.WEST);
        p2.add(new Button("p2-btn-1"));
        p2.add(new Button("p2-btn-2"));
        p1.add(p2,BorderLayout.CENTER);

        //下面
        p3.add(new Button("east-2"),BorderLayout.EAST);
        p3.add(new Button("west-3"),BorderLayout.WEST);
        //中间4个
        for (int i = 0; i < 4; i++) {
            p4.add(new Button("for-"+i));
        }
        p3.add(p4,BorderLayout.CENTER);
        frame.add(p1);
        frame.add(p3);

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

总结：

1. Frame是一个*窗口

2. Panel无法单独显示，必须添加到某个容器中

3. 布局管理器

   1. 流式 FlowLayout
   2. 东南西北中 BorderLayout
   3. 表格 GridLayout

4. 大小、定位、背景颜色、可见性、监听