请达人看一下我的程序，帮忙改正确了

Question

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class GuessExample extends Applet implements ActionListener
{
int number;
TextField  inputNumber;
Label feedBack;
Button nuttonGetNumber,buttonEnter;
public void init()
{
nuttonGetNumber=new Button("得到一个随机数");
feedBack=new Label("无反馈信息",Label.CENTER);
    feedBack.setBackground(Color.green);
  inputNumber=new TextField("0",5);
   buttonEnter=new Button("确定");
  
    buttonEnter.addActionListener(this);
 
    nuttonGetNumber.addActionListener(this);
    add(new Label("获取1-100之间的随机数："));
    add(nuttonGetNumber);
    add(new Label("输入您的猜测："));
    add(inputNumber);
    add(new Label("单击确定按钮："));
    add(buttonEnter);
    add(new Label("反馈信息:"));
    add(feedBack);
}
public void actionPerformed(ActionEvent e)
{
if( e.getSource()==  nuttonGetNumber)
{
number=(int)(Math.random()*100)+1;
}
else if(e.getSource()==  buttonEnter)
{
int guess=0;
try{
                guess=Integer.parseInt( inputNumber.getText());
if(guess==number)
{   
feedBack=new Label("猜对了!",Label.CENTER);

}
else if(guess>number)
{ 
feedBack=new Label("猜大了！",Label.CENTER);
inputNumber.setText(null);
}
else if(guess<number)
{
feedBack=new Label("猜小了",Label.CENTER);
inputNumber.setText(null);
}
}
catch(NumberFormatException event)
{
 feedBack=new Label("请输入数字字符",Label.CENTER);
} }
}


}运行了，写了html，尝试了，但反馈信息不变一直是：无信息   
应该是红色的代码写错了，没有达到效果
      请达人帮忙看一下程序!改正一下！

Answer 1

帮你改了下红色的东西,以后记住了,不能随便去new
public void actionPerformed(ActionEvent e)
{
if( e.getSource()== nuttonGetNumber)
{
number=(int)(Math.random()*100)+1;
}
else if(e.getSource()== buttonEnter)
{
int guess=0;
try{
guess=Integer.parseInt( inputNumber.getText());
if(guess==number)
{ 
feedBack.setText("答对了");}
else if(guess>number)
{ 
feedBack.setText("猜大了！");
inputNumber.setText("");
}
else if(guess<number)
{
feedBack.setText("猜小了");
inputNumber.setText("");
}
}
catch(NumberFormatException event)
{
feedBack=new Label("请输入数字字符",Label.CENTER);
} }

Answer 2

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class GuessExample extends Applet implements ActionListener
{
int number;
TextField inputNumber;
Label feedBack;
Button nuttonGetNumber,buttonEnter;
public void init()
{
nuttonGetNumber=new Button("得到一个随机数");
feedBack=new Label("无反馈信息",Label.CENTER);
//假设这里new出来的label为l1
feedBack.setBackground(Color.green);
inputNumber=new TextField("0",5);
buttonEnter=new Button("确定");buttonEnter.addActionListener(this);nuttonGetNumber.addActionListener(this);
add(new Label("获取1-100之间的随机数："));
add(nuttonGetNumber);
add(new Label("输入您的猜测："));
add(inputNumber);
add(new Label("单击确定按钮："));
add(buttonEnter);
add(new Label("反馈信息:"));
add(feedBack);//这里注意,它只添加了l1
}
public void actionPerformed(ActionEvent e)
{
if( e.getSource()== nuttonGetNumber)
{
number=(int)(Math.random()*100)+1;
}
else if(e.getSource()== buttonEnter)
{
int guess=0;
try{
guess=Integer.parseInt( inputNumber.getText());
if(guess==number)
{ 
feedBack.setText("答对了");
//这里如果用new的话,那是一个新的标签,不会改变l1的,以下new的东西也一样的}
else if(guess>number)
{ 
feedBack.setText("猜大了！");
inputNumber.setText("");
}
else if(guess<number)
{
feedBack.setText("猜小了");
inputNumber.setText("");
}
}
catch(NumberFormatException event)
{
feedBack=new Label("请输入数字字符",Label.CENTER);
} }
}
}

Answer 3

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class GuessExample extends Applet implements ActionListener
{
int number;
TextField inputNumber;
Label feedBack;
Button nuttonGetNumber,buttonEnter;
public void init()
{
nuttonGetNumber=new Button("得到一个随机数");
feedBack=new Label("无反馈信息",Label.CENTER);
feedBack.setBackground(Color.green);
inputNumber=new TextField("0",5);
buttonEnter=new Button("确定");buttonEnter.addActionListener(this);nuttonGetNumber.addActionListener(this);
add(new Label("获取1-100之间的随机数："));
add(nuttonGetNumber);
add(new Label("输入您的猜测："));
add(inputNumber);
add(new Label("单击确定按钮："));
add(buttonEnter);
add(new Label("反馈信息:"));
add(feedBack);
}
public void actionPerformed(ActionEvent e)
{
if( e.getSource()== nuttonGetNumber)
{
number=(int)(Math.random()*100)+1;feedBack.setText(new Integer(number).toString());
}
else if(e.getSource()== buttonEnter)
{
int guess=0;
try{
guess=Integer.parseInt( inputNumber.getText());
if(guess==number)
{
feedBack.setText("猜对了！");}
else if(guess>number)
{
feedBack.setText("猜大了！");
inputNumber.setText(null);
}
else if(guess<number)
{
feedBack.setText("猜小了！");
inputNumber.setText(null);
}
}
catch(NumberFormatException event)
{
feedBack.setText("请输入数字字符");
} }
}
}