• Topics: Implementing Classes

In DrJava, define a class called Counter in Counter.java.

An object of this class is used to count things, so it records a count that is a non-negative whole number.

In the Counter class, include methods to set the counter to 0 (reset), to increase the count by 1, and to decrease the count by 1. Also include an accessor method that returns the current count value, as well as a method that displays the count using System.out.println.

Notes:

Use the “private” access modifier for the Counter class instance variable.

Use these names for the Counter class methods:

   resetCount    - set the counter to 0
   increaseCount - to increase the count by 1
   decreaseCount - to decrease the count by 1
   getCount      - accessor method that *returns* the current count value
   showCount     - method that displays the value of the count

In TestCounter.java do the following:

   - Declare a Counter class object variable called mycount.
   - Reset mycount.
   - Increase mycount 3 times.
   - Show mycount. (Output should be: "Current value of count is 3")
   - Decrease mycount 4 times.
   - Show mycount. (Output should be: "Current value of count is -1")
   - Reset mycount again.
   - Show mycount. (Output should be: "Current value of count is 0")

Links to source code: Counter.java, TestCounter.java