05 三种布局管理器

1.流式布局（默认） Flowlayout

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

// 三种布局
public class Test05_FlowLayout {
    public static void main(String[] args) {
        // 流式布局
        Frame frame=new Frame("三种布局");
        frame.setVisible(true);
        // frame.setLayout(new FlowLayout()); // 默认为居中
        frame.setLayout(new FlowLayout(FlowLayout.LEFT));
        frame.setSize(200,100);
        Button button1=new Button("1");
        Button button2=new Button("2");
        Button button3=new Button("3");

        frame.add(button1);
        frame.add(button2);
        frame.add(button3);
        System.out.println("詹");

        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);  // 强制退出程序
            }
        });

2.区块布局 BorderLayout

package GUI;

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

public class Test05_BorderLayout {
    public static void main(String[] args) {

        Frame frame=new Frame("BorderLayout");
        frame.setSize(200,200);
        frame.setVisible(true);

        Button e=new Button("e");
        Button s=new Button("s");
        Button w=new Button("w");
        Button n=new Button("n");
        Button c=new Button("c");

        frame.add(e,BorderLayout.EAST);
        frame.add(s,BorderLayout.SOUTH);
        frame.add(w,BorderLayout.WEST);
        frame.add(n,BorderLayout.NORTH);
        frame.add(c,BorderLayout.CENTER);

        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);  // 强制退出程序
            }
        });


    }
}

3.表格布局 GridLayout

package GUI;

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

public class Test05_BorderLayout {
    public static void main(String[] args) {

        Frame frame=new Frame("BorderLayout");
        frame.setSize(200,200);
        frame.setVisible(true);

        Button e=new Button("e");
        Button s=new Button("s");
        Button w=new Button("w");
        Button n=new Button("n");
        Button c=new Button("c");

        frame.add(e,BorderLayout.EAST);
        frame.add(s,BorderLayout.SOUTH);
        frame.add(w,BorderLayout.WEST);
        frame.add(n,BorderLayout.NORTH);
        frame.add(c,BorderLayout.CENTER);

        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);  // 强制退出程序
            }
        });


    }
}