Day-62 Java BankAccount Program

In todays class we done a simple Java program that models a basic bank account. Using object-oriented programming (OOP) concepts, this program allows us to create bank accounts, deposit money, withdraw money, and display the account details.

Full Code

public class BankAccount{

int accountNumber;
String holderName;
int balance;

public BankAccount(int accountNumber,String holderName, int balance)
{
  this.accountNumber = accountNumber;                      //Instance variables: accountNumber, holderName, balance
  this.holderName = holderName;                            //Constructor to initialize account
  this.balance = balance;


}

public static void main(String[] args)
{
   BankAccount a1 = new BankAccount(12345,"Tamil",200);      //obj1

         a1.deposit(300);                                    //method calling statements
         int currentBalance1 = a1.balance;                   //storing return variable
         a1.displayBalance();

         a1.withdraw(100);                     
         a1.displayBalance();                  

   BankAccount a2 = new BankAccount(67890,"selvan",400);     //obj2

        a2.deposit(200);                                     //method calling statements
        int currentBalance2 = a2.balance; 
        a2.displayBalance();


        a2.withdraw(150);
        a2.displayBalance();
}

public int deposit(int amount)
{
    balance = balance + amount;                  //it returns balance so  int datatype is used
    return balance;

}
public void withdraw(int amount)                 //it doesnot return anything so used void
{
     balance = balance - amount;

}
public void displayBalance()
{       
        System.out.println("Account Number: " + accountNumber);
        System.out.println("Account Holder: " + holderName);
        System.out.println("Current Balance: " + balance);
}

}

1. Class and Instance Variables

The class BankAccount defines three variables:

• accountNumber: stores the unique account number.
• holderName: stores the name of the account holder.
• balance: stores the current account balance.

2. Constructor

The constructor initializes the values for a new bank account:

BankAccount a1 = new BankAccount(12345, "Tamil", 200);

3. deposit() Method

The deposit method adds the given amount to the balance:

a1.deposit(300); // Balance becomes 500

4. withdraw() Method

The withdraw method subtracts the given amount from the balance:

a1.withdraw(100); // Balance becomes 400

5. displayBalance() Method

This method prints the account number, holder name, and current balance:

a1.displayBalance();

6. main() Method

In the main method:

• Two bank accounts (a1 and a2) are created.
• Deposit and withdraw operations are performed.
• Updated account details are displayed after each transaction.

Output

Account Number: 12345
Account Holder: Tamil
Current Balance: 500

Account Number: 12345
Account Holder: Tamil
Current Balance: 400

Account Number: 67890
Account Holder: selvan
Current Balance: 600

Account Number: 67890
Account Holder: selvan
Current Balance: 450