Question

package threadwork;

public class WorkingWithThreads implements Runnable {

    public static void main(String[] args) {
        WorkingWithThreads wwt = new WorkingWithThreads();
    }

    public WorkingWithThreads() {
        System.out.println("Creating Thread");
        Thread t = new Thread();
        System.out.println("Starting Thread");
        t.start();
    }

    @Override
    public void run() {
        System.out.println("Thread Running");

        for (int i = 0; i < 5; i++) {
            System.out.println("Thread:" + i);
            try {
                Thread.sleep(1);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

When I run this code, it Prints Creating Thread and Starting Thread. But doesn’t prints Thread Running, that means run function is not at all called. Why is it so?

Answer 1

You have to call start() on the thread to get it to start; e.g.

Thread t = new Thread();
t.start();

If you were extending Thread, you would create a new thread and call start() on it like this:

new MyThread().start();

Since you are not extending Thread, but your class implements Runnable:

new Thread(new WorkingWithThreads()).start();