Write the definition of a class Counter containing: An instance variable named counter of type int. An instance variable named counterID of type int. A static int variable nCounters which is initialized to zero. A constructor hat takes an int argument and assigns its value to counter. It also adds one to the static variable nCounters and assigns the result to the instance variable counterID. A method named increment. It does not take parameters or return a value; it just adds one to the instance variable counter. A method named decrement that also doesn’t take parameters or return a value; it just subtracts one from the counter. A method named getValue. It returns the value of the instance variable counter. A method named getCounterID: it returns the value of the instance variable counterID.

Language: Java

Challenge:

Write the definition of a class Counter containing:

• An instance variable named counter of type int.
• An instance variable named counterID of type int.
• A static int variable nCounters which is initialized to zero.
• A constructor hat takes an int argument and assigns its value to counter. It also adds one to the static variable nCounters and assigns the result to the instance variable counterID .
• A method named increment. It does not take parameters or return a value; it just adds one to the instance variable counter.
• A method named decrement that also doesn’t take parameters or return a value; it just subtracts one from the counter.
• A method named getValue. It returns the value of the instance variable counter.
• A method named getCounterID: it returns the value of the instance variable counterID.

Solution:

public class Counter{
    private int counter;
    private int counterID;
    private static int nCounters=0;
    public Counter(int c){
        counter=c;
        nCounters++;
        counterID=nCounters;
    }
    public void increment(){
        counter++;
    }
    public void decrement(){
        counter--;
    }
    public int getValue(){
        return counter;
    }
    public int getCounterID(){
        return counterID;
    }
}