java applet 猜數字小遊戲

此為java實驗的題目之一........

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class NumberGame extends Applet
{
	TextField text1,text2;
	Button button1,button2;
	int key=(int)(Math.random()*200)+1;
	int time=0;
	public void init()
	{
		text1=new TextField(10);
		text2=new TextField(25);
		button1=new Button("Go");
		button2=new Button("key");
		add(text1);
		add(text2);
		add(button1);
		add(button2);
		text1.addActionListener(new TextAct());
		text2.addActionListener(new TextAct());
		button1.addActionListener(new ButtonAct());
		button2.addActionListener(new ButtonAct());
	}
	class TextAct implements ActionListener
	{
		public void actionPerformed(ActionEvent e)
		{
			TextField text;
			int operand;
			text=(TextField)(e.getSource());
			operand=Integer.parseInt(text.getText());
			if(operand<0|operand>200)
				text.setText("輸入資料越界");
		}
	}
	class ButtonAct implements ActionListener
	{
		public void actionPerformed(ActionEvent e)
		{
			int input;
			if(e.getSource()==button1)
			{
				input=Integer.parseInt(text1.getText());
				if(key==input)
				{
					text2.setText("goodluck! "+"you have used "+Integer.toString(time)+" times!");
				}
				else
				{
					time++;
					if(key>input)
						text2.setText("you are small!");
					else text2.setText("you are large!");
				}
			}
			else 
			{
				text2.setText("you are so foolish....");
				text1.setText(Integer.toString(key));
			}
		}
	}
	
}