Question

BankAccount Class Copy Constructor
UML as shown below
+--------------------------------------
+ BankAccount
+--------------------------------------
- balance: double
+--------------------------------------
+ BankAccount(startBalance:double)
+ BankAccount(anotherAccount: BankAccount)
+ toString(): String

CSCI-185 Prof. M. Kadri

Page 2 of 5

+--------------------------------------
Add a copy constructor to the BankAccount class. This constructor should accept a
BankAccount object as an argument. It should assign to the balance field the value in
the argument's balance field. As a result, the new object will be a copy of the argument
object.
Write a driver program to demonstrate that your copy constructor works. How?

Answer 1

BankAccount.java

public class BankAccount {
  
   // Data member
   private double balance;
  
   // Constructor to initialize balance
   public BankAccount(double balance) {
       this.balance = balance;
   }
  
   // Copy Constructor
   public BankAccount(BankAccount ba) {
       this.balance = ba.balance;
   }
  
   // This method return BankAccount details in string format
   public String toString() {
       return "Balance: "+balance;
   }
}

BankAccountTest.java

public class BankAccountTest {

   public static void main(String[] args) {
       // Create object of BankAccount by passing balance
       BankAccount ba1 = new BankAccount(1500);
       // Create object of BankAccount by copy constructor
       BankAccount ba2 = new BankAccount(ba1);
      
       // Print bankAccounts
       System.out.println("Bank Account 1: "+ba1);
       System.out.println("Bank Account 2: "+ba2);  
   }
}

OUTPUT