example7_4.java.bak

不错的教程 适合中高级人员的使用

import java.awt.*;
import java.awt.event.*;
class  YourWindow extends Frame implements ActionListener
{
	TextField text1,text2;
    Policeman police;
	YourWindow()
	{
     text1=new TextField(10);
	 text2=new TextField(10);
	 police=new Policeman();
	 setLayout(new FlowLayout());
	 add(text1);add(text2);
	 text1.addActionListener(this);
     text2.addActionListener(police);
	 setBounds(100,100,150,150);
	  setVisible(true);
	  validate();
	}

	public void actionPerformed(ActionEvent e)
	{
      String number=e.getActionCommand();
	  int n=Integer.parseInt(number);
	  int m=n*n;
	  System.out.println("n的平方是："+m);
	}
	
}

class Policeman implements ActionListener
{
	public void actionPerformed(ActionEvent e)
	{
      String number=e.getActionCommand();
	  int n=Integer.parseInt(number);
	  int m=n*n*n;
	  text2.setText("n的平方是："+m);
	}
}

public class Example7_4
{
	public static void main(String[] args) 
	{
		YourWindow win=new YourWindow();
	}
}