package awt;

import java.awt.*;
import java.awt.event.*;
public class ExGui{
         private Frame f;
         private Button b1;
         private Button b2;
         public ExGui(){
             // this.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});
//这段code放在下面的函数里也不能起到，一点窗口的叉子就关闭窗口的作用。
         }
         private void addWindowListener(WindowAdapter windowAdapter) {
            // TODO Auto-generated method stub
            
        }
        public static void main(String args[]){
                     ExGui that = new ExGui();
                   
                     that.go();
}

          public void go(){
                 f = new Frame("GUI example");
                 f.setLayout(new FlowLayout()); 
                                    //设置布局管理器为FlowLayout
                 b1 = new Button("Press Me"); 
                                    //按钮上显示字符"Press Me"
                 b2 = new Button("Don't Press Me");
                 f.add(b1);
                 f.add(b2);
                 f.pack(); 
                //紧凑排列，其作用相当于setSize()，即让窗口尽量小，小到刚刚能够包容住b1、b2两个按钮
                 
                                  f.setVisible(true);
                  }

    
        }

// 继承方式使用Frame
import java.awt.*;
import java.awt.event.*;

public class ExGui extends Frame {
    private Button b1;
    private Button b2;
    
    public ExGui() {
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }

    public static void main(String args[]) {
        ExGui that = new ExGui();
        that.go();
    }

    public void go() {
        setLayout(new FlowLayout(FlowLayout.RIGHT));
        b1 = new Button("Press Me");
        b2 = new Button("Don't Press Me");
        add(b1);
        add(b2);
        setSize(555, 666);
        setVisible(true);
    }

}