Shortcuts: +=, ++ and --

Changing a variable by a little

Writing score = score + 10 is so common that Java has a shortcut: score += 10.

public class Main {
    public static void main(String[] args) {
        int coins = 10;
        coins += 5;
        System.out.println(coins);
        coins *= 2;
        System.out.println(coins);
        coins++;
        System.out.println(coins);
        coins--;
        coins--;
        System.out.println(coins);
    }
}

Output

15
30
31
29

Remember: ++ adds one and -- takes one away. You'll see i++ in almost every loop.