Question

I’m just beginning in programming and I’d like to make exercise from a book, but I can’t. That’s my problem:

public class increment {
    int increment() {
        return this + 1; // aka this++
    }

    public static void main(String[] args) {
        int a = 0;
        System.out.println(a.increment());
    }
}

As you for sure guessed already, that it doesn’t works, I want to ask you how to get outputed integer a incremented by one, but using keyword ‘this’.

Regards and sorry for stupid questions.

Answer 1

this is an object (the current object). You cannot “increment” it.

A way to do it is:

public class Increment {
    int a = 0;
    int increment() {
        return a + 1; 
        // or: return this.a + 1;
        // or: a++; return a; if you want a to be incremented from now on
    }

    public static void main(String[] args) {
        Increment inc = new Increment();
        System.out.println(inc.increment());
    }
}