Why is this thread affecting the main thread?

Question

I must be missing something:

public class Test {
    public static void main(String[] args) {
        (new Thread(new Action())).run();
        System.out.pr         


        

Answer 1

Call start() instead of run() to start a thread.

Simply calling run() means a method call with infinite loop in the same main thread that will block the next statement written in main thread.

Have a look at Java Tutorial on Defining and Starting a Thread

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I should be (new Thread(new Action())).start(); to start a thread but still it will create an infinite loop and the new started thread will never stop.

Try with Thread.currentThread().getName() to confirm it again as shown below:

public void run() {
    System.out.println(Thread.currentThread().getName()); // output "main"
}

A Pictorial Representation of Thread Life-cycle along with it's methods