事件模型

import java.awt.*;
import java.awt.event.*;
public class TestActionEvent2 {
    public static void main(String args[]) {
            Frame f = new Frame("Test");
            Button b1 = new Button("Start");
            Button b2 = new Button("Stop");
            Monitor2 bh = new Monitor2();
            b1.addActionListener(bh);       
            b2.addActionListener(bh);
            b2.setActionCommand("game over");
            f.add(b1,"North");       
            f.add(b2,"Center");    
            f.pack();                
            f.setVisible(true);
    }
}
class Monitor2 implements ActionListener {
    public void actionPerformed(ActionEvent e) {
        System.out.println("a button has been pressed," + 
                "the relative info is:\n " + e.getActionCommand());             
    }
}

import java.awt.*;
import java.awt.event.*;

public class TFPassword {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        new TFFrame2();
    }

}

class TFFrame2 extends Frame
{
    TFFrame2()
    {
        TextField tf = new TextField();
        add(tf);
        tf.addActionListener(new TFActionListener2());
        tf.setEchoChar(‘*‘);
        pack();
        setVisible(true);
    }
}

class TFActionListener2 implements ActionListener
{
    public void actionPerformed(ActionEvent e)
    {
        TextField tf = (TextField)e.getSource();
        System.out.println(tf.getText());
        tf.setText("");
    }
}

import java.awt.*;
import java.awt.event.*;

public class TFMath {
    public static void main(String[] args) {
        new TFFrame8().launchFrame();
    }
}
 class TFFrame8 extends Frame{
     TextField t1,t2,t3;
     public void launchFrame(){
         t1=new TextField(10);
         t2=new TextField(10);
         t3=new TextField(15);
         Label l=new Label("+");
         Button bt=new Button("=");    
         bt.addActionListener(new MyMonitor());
         //bt.addActionListener(new MyMonitor(this));
         setLayout(new FlowLayout());
         add(t1);
         add(l);
         add(t2);
         add(bt);
         add(t3);
         pack();
         setVisible(true);
     }
     private class MyMonitor implements ActionListener  {//内部类；可直接访问包装类的成员变量和成员方法；生成TFFrame
            public void actionPerformed(ActionEvent e) {
                int n1 = Integer.parseInt(t1.getText());
                int n2 = Integer.parseInt(t2.getText());
                t3.setText("" + (n1+n2));
            }
        }
 }
 /*class MyMonitor implements ActionListener{
     TFFrame8 t=null;
     public MyMonitor(TFFrame8 tf){ 
          t=tf;
     }
     public void actionPerformed(ActionEvent e) {
            int n1=Integer.parseInt(t.t1.getText());
            int n2=Integer.parseInt(t.t2.getText());
            t.t3.setText(""+(n1+n2));
     }
     
 }*/

import java.awt.*;

public class TestPaint {
    public static void main(String[] args) {
        new PaintFrame().launchFrame();
    }
}

class PaintFrame extends Frame {
    
    public void launchFrame() {
        setBounds(200,200,640,480);
        setVisible(true);
    }
    
    public void paint(Graphics g) {
        Color c = g.getColor();
        g.setColor(Color.red);
        g.fillOval(50, 50, 30, 30);
        g.setColor(Color.green);
        g.fillRect(80,80,40,40);
        g.setColor(c);
    }
}

import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class MyMouseAdapter{
  public static void main(String args[]) {
    new MyFrame("drawing...");
  }
}

class MyFrame extends Frame {
  ArrayList points = null;//ArrayList<Point> points=null（有泛型）
  MyFrame(String s) {
    super(s);
    points = new ArrayList(); 
    setLayout(null);
    setBounds(300,300,400,300); 
    this.setBackground(new Color(204,204,255));
    setVisible(true);
    this.addMouseListener(new Monitor());
    }
    
    public void paint(Graphics g) {
    Iterator i = points.iterator();//Iterator<Point> =points.iterator();
    while(i.hasNext()){
      Point p = (Point)i.next();//Point p = i.next();
      g.setColor(Color.BLUE);
      g.fillOval(p.x,p.y,10,10);
    }
  }
  
  public void addPoint(Point p){
    points.add(p);
  }
}

class Monitor extends MouseAdapter {//实现了MouseLisener接口，如果implement接口的话需要重写很多方法
  public void mousePressed(MouseEvent e) {
    MyFrame f = (MyFrame)e.getSource();
    f.addPoint(new Point(e.getX(),e.getY()));
    f.repaint();//先调用update方法然后调用paint方法
  }
}

import java.awt.*;
import java.awt.event.*;
public class TestWindowClose {
  public static void main(String args[]) {
    new MyFrame55("MyFrame");
  }
}
class MyFrame55 extends Frame {
  MyFrame55(String s) {
    super(s);
    setLayout(null);
    setBounds(300, 300, 400, 300);
    this.setBackground(new Color(204, 204, 255));
    setVisible(true);
    //this.addWindowListener(new MyWindowMonitor());
    
    this.addWindowListener(            //匿名类
    new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        setVisible(false);
        System.exit(-1);//非正常退出。。。。但是和正常退出在效果上没差
      }
    });
    
  }
  /*
  class MyWindowMonitor extends WindowAdapter {
      public void windowClosing(WindowEvent e) {
          setVisible(false);
          System.exit(0);//正常退出
      }
  }
  */
}