Chapter 8, Problem 21RE

Explanation of Solution

Swapping two “BankAccount” objects:

Consider the below program,

//define a class Test

public class Test

{

//define a method falseSwap()

public static void falseSwap(BankAccount a, BankAccount b)

{

//assign the value of a to temp

BankAccount temp = a;

//assign the value of b to a

a = b;

//assign the value of temp to b

b = temp;

}

//define the main() method

public static void main(String[] args)

{

//create object of BankAccount

BankAccount acc1 = new BankAccount (10,100,'S');

BankAccount acc2 = new BankAccount (1000,600,'C');

//call the method swap()

swap(acc1, acc2);

}

}

• “swap()” will not work in the program above. Below is an explanation for the same,
• In the “main()” function, then the user tries to call the new operator the create the instance of a “BankAccount” class, an object instance of the variable “acc1” is created.
• “acc1” variable will hold the memory reference location where the object is stored...