Question

need Algorithm and java code, please don't post only one!!

Define a class called Counter. An object of this class is used to count things so it records a count that is a non-negative whole number. Include methods to set the counter to 0, to increase the counter by 1, and to decrease the counter by 1. Be sure that no method allows the value of the counter to become negative. Also include an accessor method that returns the current count value, as well as a method that displays the count on the screen. Do not define an input method. The only method that can set the counter is the one that sets it to zero. Write a program to test your class definition. (Hint: you need only one instance variable).

Answer 1

public class Counter {
        private int count;
        
        public Counter() {
                count = 0;
        }

        // increase the value of count
        public void increase() {
                count += 1;
        }

        // decrease the value of count
        public void decrease() {
                count -= 1;
                if(count < 0) {
                        count = 0;
                }
        }

        // get count value
        public int getCount() {
                return count;
        }
        
        public void resetCount() {
                count = 0;
        }
}



public class CounterTest {

        public static void main(String[] args) {
                Counter c = new Counter();
                
                c.increase();
                c.increase();
                c.increase();
                System.out.println(c.getCount());
                
                c.decrease();
                System.out.println(c.getCount());
                
                c.resetCount();
                System.out.println(c.getCount());
        }

}

Algorithm:
1. The counter class should contain a variable to hold the current count.
2. It exposes methods to increment and decrement the count. While doing these operations, we ensure that value defaults to 0, if it tries to become negative.
3. Provide a method to reset the value to start value, i.e. 0

please ask if any doubts. Thanks!