Question

Write a complete Java program to create three types of counters as follows:

1. The first counter increases its value by one.
2. The second counter increases its value by two.
3. The third counter increases its value by three.

Please follow these notes:

1. Create one class for all counter types. The name of the class is Three_type_counter.
2. Define a constructor method that initial values for all counters to 7 when the class object created.
3. Create method for each counter as: count1, count2 and count3. Each method has to increase each counter value by one, two and three respectively.
4. In the main program:
   1. Create new object with name “obj_counter”.
   2. Call the three methods for each counter at one time.
   3. Print out the values for all counters.(support your answer by screenshot)

Answer 1

public class Three_type_counter {

   public int firstCounter;
   public int secondCounter;
   public int thirdCounter;
  
   // constructor of the class
   public Three_type_counter()
   {
       firstCounter=7;
       secondCounter=7;
       thirdCounter=7;
   }
  
   // increment by one
   public void Count1()
   {
       firstCounter++;
       secondCounter++;
       thirdCounter++;
       return;
   }
  
   // increment by two
   public void Count2()
   {
       firstCounter=firstCounter+2;
       secondCounter=secondCounter+2;
       thirdCounter=thirdCounter+2;
       return;
   }
   // increment by three
   public void Count3()
   {
       firstCounter=firstCounter+3;
       secondCounter=secondCounter+3;
       thirdCounter=thirdCounter+3;
       return;
   }
   // main function
   public static void main(String args[])
   {
       Three_type_counter obj_counter=new Three_type_counter();
       obj_counter.Count1();
       obj_counter.Count2();
       obj_counter.Count3();
       System.out.println(obj_counter.firstCounter);
       System.out.println(obj_counter.secondCounter);
       System.out.println(obj_counter.thirdCounter);
   }
}