Java 图形编程 二：布局管理器之边界布局

package second;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class BorderLayoutDemo {
    private Frame fb;
    private Button b1,b2,b3,b4,b5;//声明5个button
    //构造函数，实例化button 1 - 5
    BorderLayoutDemo(){
        b1 = new Button("1");//上北
        b2 = new Button("2");//下南
        b3 = new Button("3");//左西
        b4 = new Button("4");//右东
        b5 = new Button("5");//中
    }
    public static void main(String[] args){
        BorderLayoutDemo ly = new BorderLayoutDemo();
        ly.show();//显示
    }
    public void show(){
        fb = new Frame("BorderLayout顺序布局");//框架
        fb.setSize(500,200);//设置大小
        fb.setLayout(new BorderLayout());
        fb.add(BorderLayout.NORTH,b1);//将按钮添加到框架中
        fb.add(BorderLayout.SOUTH,b2);
        fb.add(BorderLayout.WEST,b3);
        fb.add(BorderLayout.EAST,b4);
        fb.add(BorderLayout.CENTER,b5);
        fb.addWindowListener(new WindowAdapter(){//监视关闭按钮，不然TMD根本关不掉
            public void windowClosing(WindowEvent evt){
                System.exit(0);
            }
        });
        fb.setVisible(true);//最后显示出来
    }
}

效果如下：