So I was going through the internal working of Executor Service, and in the constructor of thread there were these lines mentioned:

    Thread(ThreadGroup g, String name, int characteristics, Runnable task,
           long stackSize, AccessControlContext acc) {

        Thread parent = currentThread();
        boolean attached = (parent == this);   // primordial or JNI attached

So my question here is, how is it possible that current running thread is equal to the new instance of thread ?

Didn’t find anything about it.