java 图形化界面 布局管理器

 package Layout;
 import java.awt.*;
 import javax.swing.*;
 public class MyBorderLayout extends JFrame{
     private JButton b1 = new JButton("东");
     private JButton b2 = new JButton("南");
     private JButton b3 = new JButton("西");
     private JButton b4 = new JButton("北");
     private JButton b5 = new JButton("中");
 public MyBorderLayout(){

     setTitle("用户界面");
     setSize(500, 500);
     setLocation(100, 100);
     add(b1,BorderLayout.EAST);
     add(b2,BorderLayout.SOUTH);
     add(b3,BorderLayout.WEST);
     add(b4,BorderLayout.NORTH);
     add(b5,BorderLayout.CENTER);

     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     setVisible(true);
 }

     public static void main(String[] args) {
     MyBorderLayout l = new MyBorderLayout();

     }

 }

 package Layout;
 import java.awt.*;
 import java.util.HashMap;
 import java.util.Map;

 import javax.swing.*;
 public class MyFlowLayout extends JFrame{
     private  Map<String,JButton> map = new HashMap();
     private  JButton b = new JButton();
    public MyFlowLayout(){
        map.put("B1",new JButton("B1"));
        map.put("B2",new JButton("B2"));
        map.put("B3",new JButton("B3"));
        map.put("B4",new JButton("B4"));
        map.put("B5",new JButton("B5"));
        this.setLayout(new FlowLayout());
     //   this.setLayout(new FlowLayout(FlowLayout.LEFT));
     //   this.setLayout(new FlowLayout(FlowLayout.RIGHT));
        this.add(map.get("B1"));
        this.add(map.get("B2"));
        this.add(map.get("B3"));
        this.add(map.get("B4"));
        this.add(map.get("B5"));
        this.setTitle("用户界面");
        this.setSize(500, 400);
        this.setLocation(400, 500);
        this.setVisible(true);
    }

     public static void main(String[] args) {

          MyFlowLayout l = new MyFlowLayout();
     }

 }

 package Layout;
 import java.awt.*;
 import java.util.HashMap;
 import java.util.Map;
 import javax.swing.*;
 public class MyGridLayout extends JFrame {
     private  Map<String,JButton> map = new HashMap();
     public MyGridLayout (){

                map.put("B1",new JButton("B1"));
                map.put("B2",new JButton("B2"));
                map.put("B3",new JButton("B3"));
                map.put("B4",new JButton("B4"));
                map.put("B5",new JButton("B5"));
                map.put("B6",new JButton("B6"));
                map.put("B7",new JButton("B7"));
                map.put("B8",new JButton("B8"));
                map.put("B9",new JButton("B9"));
                this.add(map.get("B1"));
                this.add(map.get("B2"));
                this.add(map.get("B3"));
                this.add(map.get("B4"));
                this.add(map.get("B5"));
                this.add(map.get("B6"));
                this.add(map.get("B7"));
                this.add(map.get("B8"));
                this.add(map.get("B9"));

                this.setTitle("用户界面");
                this.setSize(500, 600);
                this.setLocation(500, 500);
                this.setVisible(true);
               this.setLayout(new GridLayout(3,3,15,15)); 

     }
     public static void main(String[] args) {
     MyGridLayout l = new MyGridLayout();

     }

 }