新手写代码出错，代码

import javax.swing.JOptionPane;

public class TurtorLoop {
public static void main(String[] args) {
int correctCount=0;
int count=0;
long starttime= System.currentTimeMillis();
String output="";

while(count<10){
int num1=(int)(Math.random()*10);
int num2=(int)(Math.random()*10);

if(num1<num2){
int temp = num1;
num1 = num2;
num2 = temp;
}

String answerString = JOptoinPane.showInputDialog ("What is "+num1+"-"+num2+"?");
int answer= Integer.parseInt(answerString);

String replyString;
if (num1 - nun2 == answer ) {
replyString = "You are correct";
correctCount++;
}
else
replyString="Your answer is wrong.\n"+num1+"-"+num2+"should be "+(num1-num2);
JOptionPane.showMessageDialog(null,replyString);
count++;
output = "\n"+num1+"-"+num2+"="+answerString+((num1-num2==answer)?"correct":"wrong");
}

long endTime =System.currentTimeMillis();
long testTime=System.currentTimeMillis();
  JOptionPane.showMessageDialog(null,"Correct count is"+correctCount+
  "\nTest time is"+testTime/1000+"seconds\n"+output);
  }
}

用Eclipse编译运行后，出现如下错误。请多指教！
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
nun2 cannot be resolved to a variable

at TurtorLoop.main(TurtorLoop.java:25)

我是新手请大家多喷一喷，让我成长的更快些。多谢。 --------------------编程问答--------------------

Java code服务端

import java.net.*;

import java.io.*;

import java.util.*;

class fanserver

{

    static List<fanclient> client = new ArrayList<fanclient>();

    public static void main(String[] args)throws Exception 

    {

        Socket s;

        ServerSocket ss = new ServerSocket(4445);

        while(true){

            s = ss.accept();

            System.out.println("haha...");

            server ser = new server(s);

            new Thread(ser).start();

            client.add(ser);

        }

    /*    BufferedReader br = 

            new BufferedReader(new InputStreamReader(System.in));

        BufferedWriter bwout = 

            new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));

        BufferedReader brin = 

            new BufferedReader(new InputStreamReader(s.getInputStream()));

        String str = null;

        while((str=brin.readLine())!=null){

        //    System.out.println(str);

            bwout.write(str);

            bwout.flush();

            bwout.newLine();

        }

        */

        

    //    s.shutdownOutput();

        

        

    }

}

class server implements Runnable

{

    private Socket s;

    server(Socket s){

        this.s = s;

    }

    public void run(){

        try{

            

            BufferedWriter bwout = 

                new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));

            BufferedReader brin = 

                new BufferedReader(new InputStreamReader(s.getInputStream()));

            

            String str = null;

            while((str=brin.readLine())!=null){

                System.out.println(str);

                bwout.write(str);

                bwout.newLine();

                

                bwout.flush();

            }

        //    s.shutdownOutput();

            

        }

        catch(Exception e){}

    }

}

Java code客户端



import java.net.*;

import java.io.*;

class fanclient 

{    



    public static void main(String[] args)throws Exception

    {

        Socket s = new Socket("192.168.30.129",4445);

        BufferedReader br = 

            new BufferedReader(new InputStreamReader(System.in));

        BufferedWriter bwout = 

            new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));

        BufferedReader brin = 

            new BufferedReader(new InputStreamReader(s.getInputStream()));

        new Thread(new client(brin)).start();

        String str = null;

        while((str=br.readLine())!=null){

            

            bwout.write(str);

            

            bwout.newLine();

            bwout.flush();

            

        }

        

    //    s.shutdownOutput();

    

    //    String line = brin.readLine();

    //    System.out.println(line);

    

    

    }

}

class client implements Runnable

{

    private BufferedReader brin;

    client(BufferedReader brin)

    {

        this.brin = brin;

    }

    public void run(){

        String line = null;

        try{

            while((line=brin.readLine())!=null){

                System.out.println(line);    

            }

        }catch(Exception e){}

    }

}



我同时启动好几个客户端，想让客户端通过服无端互相接收到信息，怎么处理，

--------------------编程问答-------------------- nun2改成num2吧，要细心一点哦 --------------------编程问答-------------------- if (num1 - nun2 == answer ) 变为if (num1 - num2 == answer ) --------------------编程问答-------------------- JOptionPane写错了
nun2 改成 num2
--------------------编程问答--------------------



import javax.swing.JOptionPane;



public class TurtorLoop {

	public static void main(String[] args) {

		int correctCount=0;

		int count=0;

		long starttime= System.currentTimeMillis();

		String output="";

		

		while(count<10){

		int num1=(int)(Math.random()*10);

		int num2=(int)(Math.random()*10);

		

		if(num1<num2){

		int temp = num1;

		num1 = num2;

		num2 = temp;

		}



		String answerString = JOptionPane.showInputDialog ("What is "+num1+"-"+num2+"?");

		int answer= Integer.parseInt(answerString);

		

		String replyString;

		if (num1 - num2 == answer ) {

		replyString = "You are correct";

		correctCount++;

		}

		else

		replyString="Your answer is wrong.\n"+num1+"-"+num2+"should be "+(num1-num2);

		JOptionPane.showMessageDialog(null,replyString);

		count++;

		output = "\n"+num1+"-"+num2+"="+answerString+((num1-num2==answer)?"correct":"wrong");

		}

		

		long endTime =System.currentTimeMillis();

		long testTime=System.currentTimeMillis();

		  JOptionPane.showMessageDialog(null,"Correct count is"+correctCount+

		"\nTest time is"+testTime/1000+"seconds\n"+output);

	}

}

用Eclipse应该自动报错的，然后你看看下划线按F2获得焦点看看咋回事呀~
要仔细 --------------------编程问答-------------------- 上面代码突出显示不出来……



import javax.swing.JOptionPane;



public class TurtorLoop {

    public static void main(String[] args) {

        int correctCount=0;

        int count=0;

        long starttime= System.currentTimeMillis();

        String output="";

        

        while(count<10){

        int num1=(int)(Math.random()*10);

        int num2=(int)(Math.random()*10);

        

        if(num1<num2){

        int temp = num1;

        num1 = num2;

        num2 = temp;

        }



        String answerString = JOptionPane.showInputDialog ("What is "+num1+"-"+num2+"?");//是JOptionPane

        int answer= Integer.parseInt(answerString);

        

        String replyString;

        if (num1 - num2 == answer ) {   //是num2

        replyString = "You are correct";

        correctCount++;

        }

        else

        replyString="Your answer is wrong.\n"+num1+"-"+num2+"should be "+(num1-num2);

        JOptionPane.showMessageDialog(null,replyString);

        count++;

        output = "\n"+num1+"-"+num2+"="+answerString+((num1-num2==answer)?"correct":"wrong");

        }

        

        long endTime =System.currentTimeMillis();

        long testTime=System.currentTimeMillis();

          JOptionPane.showMessageDialog(null,"Correct count is"+correctCount+

        "\nTest time is"+testTime/1000+"seconds\n"+output);

    }

}

--------------------编程问答-------------------- nun2 cannot be resolved to a variable

要学会从报错信息里发现关键、有用的信息啊
上面的报错信息就很明确的指出了：“nun2”不能解析为一个变量 --------------------编程问答-------------------- 嗯细节问题 --------------------编程问答-------------------- 学习了，谢谢楼主 --------------------编程问答-------------------- 问题解决了结贴吧就！有时候需要细心的查一下，尤其是log,从中找出与你代码有关的信息，然后仔细检查！ --------------------编程问答-------------------- 是这样，一般遇到问题，要先看异常是怎么给你说的。就像这次，说的很明白的。

引用 2 楼的回复:

nun2改成num2吧，要细心一点哦

--------------------编程问答-------------------- 新手嘛,加油哦!
写代码自己定个标准,写完后编译不要超过三个错误!自己定个框框

补充：Java ,  Java SE