What's the point of instantiating an object and not assigning it to a variable in Java?

Question

What is the use of the new keyword when you don't assign the resulting object to a reference?

here is sample.

public static void main(String[] args) {ample.
    Display display = new Display();

    new SWTApp(display);

    display.dispose();
}

Answer 1

In your case, most probably, the constructor has a side-effect (launching the application in a thread?) and you are exclusively interested in that side-effect.

Look at it like an ugly way of invoking a method.

Answer 2

Presumably in this case the constructor for SWTApp actually runs the application until it's closed. That doesn't sound like a great design to me, but there's nothing in the language to actually prevent it.