Why is there an object as an argument in this multi-thread example?

Question

What is the purpose of the line with the 2 new’s in it?

class Loader implements Runnable {
public void run() {
System.out.println("Hello");
}
}

class MyClass {
public static void main(String[ ] args) {
Thread t = new Thread(new Loader());
t.start();
}
}

Answer 1

The Thread object "t" is initialized to a new Thread object. the Thread constructor requires a Runnable instance (that's being created with the new keyword) as an argument. After that, the t.start() method fires the Loader's "run()" method.

Remember that a Loader is a child of Runnable that overrides the run method. That's why the new Loader can be used as a Runnable object.