Chapter 9, Problem 13E

Explanation of Solution

Adding “equals()” method to “Cash” class:

//Definition of method equals()

public boolean equals(Object obj)

{

    //Check whether "obj" is the instance of Cash

    if (obj instanceof Cash)

    {

        //Create an object "cashVal" to cash

        Cash cashVal = (Cash) obj;

        //Assign and return amount

        return amount == cashVal...