What is the difference between >>= and >>>= in Java?

Question

Reading a book about the Java language, I came across some operators I had never noticed before. They are: >>, <<, >>=, <<=, >>>, <<<, >>>= and <<<=. I suppose knowing the difference between only two of these operations being >>= and >>>=, it is possible to clarify on all other.

What difference between >>= and >>>=? In which situation they can be applied?

Answer 1

There’s nothing oop about that. These are bit operators, in which case are the compound assignment operators, then it will take this variable apply the operator and the result will be saved in the variable itself. You can say he does the operation inplace.

The >>= moves the bits to the right and fills with 0 the ones on the left that become "empty". Already the >>>= does the same but disregarding the signal.

class HelloWorld {
    public static void main (String[] args) {
        int x = -100;
        x >>= 2;
        System.out.println(x);
        x = 100;
        x >>= 2;
        System.out.println(x);
        x = -100;
        x >>>= 2;
        System.out.println(x);
        x = 100;
        x >>>= 2;
        System.out.println(x);
    }
}

Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.