Без возвращаемого значения

Классы / Методы

class Counter {
    public int count;

    public void incBy(int value) {
        count += value;
    }

    public void incBy(int value, int amount) {
        count += value * amount;
    }
}

var counter = new Counter();
counter.incBy(1);
//counter.Count is 1
System.out.println(counter.count);

counter.incBy(2, 5);
//counter.Count is 11
System.out.println(counter.count);