Question

public class ThreadState {

    public static void main(String[] args){
            Thread t = new Thread(){
            public void run(){
                       // infinite loop
                       while (true) {
                        try {

                         Thread.sleep(1000);
                        }
                        catch (InterruptedException e) {
                        }

                        System.out.println("thread is running..."+Thread.currentThread().toString());
                       }

            }
        };
        t.start() ; 
        t = null ;
        while (true) {
              try {

              Thread.sleep(3000);
              }
              catch (InterruptedException e) {
              }
              System.out.println("thread is running..."+Thread.currentThread().toString());
        }   

    }
}

Thread instance t is initialized to null .. still it is able to run and prints its detail on the console . Need an explanation for this

Answer 1

Thread instance t is initialized to null

No, the Thread variable is set to have a null value. Variables aren’t instances – it’s worth making absolutely sure that you understand that.

Changing the value of the variable doesn’t affect the existing Thread object at all.