Class extending thread

[Vijay Tidake]

public class TestMe {
	public static void main(String[] args) {
		new A(new B()).start();
		new Thread(new B()).start();
	}
}

class A extends Thread{
	public A(Runnable runnable){
		super(runnable);
	}
	@Override
	public void run() {
		System.out.println( "A" );
	}	
}

class B implements Runnable{
	@Override
	public void run() {
		System.out.println( "B" );
	}
}

Why above main method the first call print "A" and second is printing "B", although I am passing same job to both the thread?

[Les Morgan]

Because your OS will allow which ever thread that is ready to go first, and it is not always the one you think it is.

[Vijay Tidake]

It is not about the sequence. Consider these as two different programs.
My question is if I am passing the Runnable job to class A (Thread), still it is not executing it class B.

If I dont override run in class A , both line will print B.?

[Henry Wong]

Vijay Tidake wrote:
My question is if I am passing the Runnable job to class A (Thread), still it is not executing it class B.

It is the run() method of the Thread class that calls the run() method of the Runnable that is passed via the constructor. So, if you try to *both* pass a Runnable and override the run() method, then the latter will execute.

Henry