Java - creating a new thread

Question

You are calling the one.start() method in the run method of your Thread. But the run method will only be called when a thread is already started. Do this instead:

one = new Thread() {
    public void run() {
        try {
            System.out.println("Does it work?");

            Thread.sleep(1000);

            System.out.println("Nope, it doesnt...again.");
        } catch(InterruptedException v) {
            System.out.println(v);
        }
    }  
};

one.start();

You can do like:

    Thread t1 = new Thread(new Runnable() {
    public void run()
    {
         // code goes here.
    }});  
    t1.start();

The goal was to write code to call start() and join() in one place. Parameter anonymous class is an anonymous function. new Thread(() ->{})

new Thread(() ->{
        System.out.println("Does it work?");
        Thread.sleep(1000);
        System.out.println("Nope, it doesnt...again.");       
}){{start();}}.join();

In the body of an anonymous class has instance-block that calls start(). The result is a new instance of class Thread, which is called join().

You need to do two things:

• Start the thread
• Wait for the thread to finish (die) before proceeding

ie

one.start();
one.join();

If you don't start() it, nothing will happen - creating a Thread doesn't execute it.

If you don't join) it, your main thread may finish and exit and the whole program exit before the other thread has been scheduled to execute. It's indeterminate whether it runs or not if you don't join it. The new thread may usually run, but may sometimes not run. Better to be certain.

If you want more Thread to be created, in above case you have to repeat the code inside run method or at least repeat calling some method inside.

Try this, which will help you to call as many times you needed. It will be helpful when you need to execute your run more then once and from many place.

class A extends Thread {
    public void run() {
             //Code you want to get executed seperately then main thread.       
    }
     }

Main class

A obj1 = new A();
obj1.start();

A obj2 = new A();
obj2.start();

run() method is called by start(). That happens automatically. You just need to call start(). For a complete tutorial on creating and calling threads see my blog http://preciselyconcise.com/java/concurrency/a_concurrency.php