What will be the result of compiling the following code:

public class ThreadTest {
    public static void main(String[] args) throws InterruptedException {
        Thread thread = new Thread(new TestThread());
        System.out.println("Hello, it's a main thread");
        thread.start();
        thread.join();
        System.out.println("Good bye");
    }
}

class TestThread implements Runnable {

    @Override
    public void run() {
        System.out.println("Hello, it's a simple thread");
    }

    public void join() {
        System.out.println("Hello, it's a method join()");
    }
}