testarithmetic.java

java 编程的一些简单例子

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

public Class UseArithmetic extends Applet implements ActionListener
{
       Label prompt;
	TextField input1,input2;
	Button btn;
	int a=0,b=1;

	public void init()
	{
	  prompt=new Label("please input 2 int shu:");
	  input1=new TextField(5);
	  input2=new TextField(5);
	  btn=new Button("jisuan:");
	  add (prompt);
	  add(input1);
	  add(input2);
	  add(btn);
	  btn.addActionListener(this);
         }
		public void paint(Graphics g)
  		{
			g.drawString(a+"+"+b+"="+(a+b),10,50);
		}
	public void actionPerformed(ActionEvent e)
	{
	   a=Integer.parseInt(input1.getText());
	   b=Integer.parseInt(input2.getText());
	   repaint();
	}
}