Write a class named Accumulator containing: An instance variable named sum of type integer, initialized to 0. A method named get Sum that returns the value of sum . A method named add that accepts an...

Write a class named Accumulator containing: An instance variable named sum of type integer, initialized to 0. A method named get Sum that returns the value of sum . A method named add that accepts an integer parameter. The value of sum is increased by the value of the parameter.