请问各们高手，这程序里是哪里出错了

Question

package ch3.thread;
public class Threaddemo3 extends Thread{
  private String name;
  private int delay;
  public Threaddemo3(String sname,int i_delay){
     name=sname;
     delay=i_delay;
  }
  public void run(){
  {
   try {
       sleep(delay);
     } catch(InterruptedException e){
     }
     System.out.println("MultiThread test!\n"+name+"\n"+delay);
    }
 }
class multites{
     public static void main(String args[]){
         Threaddemo3 th1,th2,th3;
         th1=new Threaddemo3("Thread1",(int) (Math.random()*900));
         th2=new Threaddemo3("Thread2",(int) (Math.random()*800));
         th3=new Threaddemo3("Thread3",(int) (Math.random()*800));
         th1.start();
         th2.start();
         th3.start();
  }
 }

Answer 1

run那个位置多了个括号public void run(){ 
  { 
去掉一个就行了

Answer 2

改动如下：package ch3.thread;  
class Threaddemo3 extends Thread {
  private String name;
  private int delay;
  public Threaddemo3(String sname,int i_delay)
  {
    name=sname;
    delay=i_delay;
  }
  public void run()
  {
   try 
   {
      sleep(delay);
    } 
    catch(InterruptedException e)
    {    }
    System.out.println("MultiThread test!\n"+name+"\n"+delay);
   }
}
public class Multites {
    public static void main(String args[])
    {
        Threaddemo3 th1,th2,th3;
        th1=new Threaddemo3("Thread1",(int) (Math.random()*900));
        th2=new Threaddemo3("Thread2",(int) (Math.random()*800));
        th3=new Threaddemo3("Thread3",(int) (Math.random()*800));
        th1.start();
        th2.start();
        th3.start();
    }
} 

Answer 3

package ch3.thread; 
public class Threaddemo3 extends Thread{ 
  private String name; 
  private int delay; 
  public Threaddemo3(String sname,int i_delay){ 
    name=sname; 
    delay=i_delay; 
  } 
  public void run(){ 
  { 
  try { 
      sleep(delay); 
    } catch(InterruptedException e){ 
    } 
    System.out.println("MultiThread test!\n"+name+"\n"+delay); 
    } 
} 
class multites{ 
    public static void main(String args[]){ 
        Threaddemo3 th1,th2,th3; 
        th1=new Threaddemo3("Thread1",(int) (Math.random()*900)); 
        th2=new Threaddemo3("Thread2",(int) (Math.random()*800)); 
        th3=new Threaddemo3("Thread3",(int) (Math.random()*800)); 
        th1.start(); 
        th2.start(); 
        th3.start(); 
  } 
} 

Answer 4

1楼说得对，这个你要是用那个IDE工具不就一下看出来了

Answer 5

Eclipse中可以检查到语法错误。建议实用IDE工具开发。

Answer 6

为什么要去除RUN方法，从THREAD继承不得重写这个方法吗

Answer 7

去掉一个“{”，不是run()方法，楼上看错了。