Counter.java

public class Counter {

    private int startValue;

    public Counter(int startValue) {
        this.startValue = startValue;
    }

    public Counter() {
        this(0);
    }

    public int value() {
        return startValue;
    }
    public void increase() {
        startValue++;
    }
    public void decrease() {
        startValue--;
    }

    public void increase(int increaseBy) {
        /* if(decreaseBy >= 0) {
            startValue += decreaseBy;
        } */
        startValue = increaseBy < 0 ? startValue : startValue+increaseBy;

    }
    public void decrese(int decreaseBy) {
        /* if(decreaseBy >= 0) {
            startValue -= decreaseBy;
        } */
        startValue = decreaseBy < 0 ? startValue : startValue-decreaseBy;
    }
    public static void main(String[] args) {
        Counter counter1 = new Counter();
        System.out.println("Value of counter1: " + counter1.value()); // 0
        counter1.increase();
        System.out.println("Value of counter1: " + counter1.value()); // 1
        counter1.increase(10);
        System.out.println("Value of counter1: " + counter1.value()); // 11

        counter1.decrease();
        System.out.println("Value of counter1: " + counter1.value()); // 10
        counter1.decrese(5);
        System.out.println("Value of counter1: " + counter1.value()); // 5
        counter1.decrese(-2);
        System.out.println("Value of counter1: " + counter1.value()); // still 5

        counter1.increase(-4);
        System.out.println("Value of counter1: " + counter1.value()); // still 5®




    }
}