OOPS

Assignment - 12

Objective

Write a program to withraw money from a bank account, if the withdrawn money is greater than the balance, then it throws NoMoneyException.

Programming Language & Compilation

• Java

$ javac Program.java
$ java Program

Source Code

import java.lang.System;

// Entry point of the program.
public class Program {
  public static void main(String[] args) {
    BankAccount account = new BankAccount("Steve Jobs", 5000.0);
    try {
      // Attempt to withdraw `100000.0`, which is more than the balance.
      account.withdraw(100000.0);
    } catch (NoMoneyException e) {
      System.out.println("Exception Message: " + e.getMessage());
    } finally {
      // Will stay unchanged i.e. `5000.0`.
      System.out.println("Balance After Transaction: " + account.getBalance());
    }
  }
}

// This `Exception` is thrown by the `BankAccount.withdraw` if entered amount is
// more than the available balance.
class NoMoneyException extends Exception {
  public NoMoneyException(String message) {
    super(message);
  }
}

// Minimal `BankAccount` with customer's `name` and `balance`.
// `withdraw` method throws `NoMoneyException` if entered amount is more than
// the available balance.
class BankAccount {
  private String name;
  private double balance;

  public BankAccount(String name, double balance) {
    this.name = name;
    this.balance = balance;
  }

  public void withdraw(double amount) throws NoMoneyException {
    if (balance < amount) {
      throw new NoMoneyException(amount + " is more than the balance of " + balance);
    }
    balance -= amount;
  }

  // Public getters.

  public String getName() {
    return name;
  }

  public double getBalance() {
    return balance;
  }
}

Output

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