Why this code not giving compile time error?

[m ali]

Hi All,

Why the following code not giving the compile time error, please explain anyone?

   
public class Mickle  extends Thread implements Runnable{
    public static void main(String argv[]){
Mickle m = new Mickle();
m.start();
    
    }
    public void run(){
go();
    }
     public void  go(){
int i;
while(true){
    try{
wait();
System.out.println("interrupted");
    }catch (InterruptedException e) {}
}
 
    }
}
 

Source: Certified java programmers exam question of the day(eXamulator).

Thanks in advance.

[gaurav abbi]

hi,
why should it give error? what thing wrong you find in this.
its more of a OOPS concept based question than on Threads..
you are implementing an interface and extending a class..
and you are not implementing run() method, you are overriding run method of Thread class and moreover if you don't explicitly say implementing Runnable, even then implicitly it implements Runnable.

see the following:

interface AI{
void m1();
}
class AImp implements AI{
public void m1(){}
}
class BImp extends AImp implements AI{
public void m1(){}
}

[Keith Lynn]

It is not a compile-time error. But at runtime you will get an IllegalMonitorStateException because you are not calling the wait() method in a synchronized context.