Invoking a method of an anonymous class

Question

I learned the other day that you can do this

new Object() {
    void hello() {
        System.out.println(\"Hello World!\");
    }
}.hello();

Answer 1

Adding to Sotirios' answer, here's how to invoke the method through reflection:

Object o = new Object() {
    void hello() {
        System.out.println("Hello World!");
    }
};

Method hello = o.getClass().getDeclaredMethod("hello");
hello.invoke(o);

This allows you to call the method more than once, but other than that, makes little sense.