Question

Please make a program that in Bank Account class keeps a users name and balance. Will throw an exception if the balance becomes negative.

Answer 1

class BankAccount {
   private int accNo;
   private String userName;
   private double balance;

   //constructor
   public BankAccount(int accNo, String userName,double balance) throws Exception {
       if(balance < 0) {
           throw new Exception("Account balance cannot be negative");
       }
       this.balance = balance;
       this.accNo = accNo;
       this.userName = userName;
   }

   public void withdraw(double amount) throws Exception {
       if (amount > balance) {
           throw new Exception(
               "Current balance %d is less than the requested withdrawal amount %d",
               balance, amount);   
       }
       balance -= amount;
   }

   public void deposit(double amount) {
       if (amount <= 0) {
throw new IllegalArgumentException("Invalid deposit amount %s", amount);
}
       balance += amount;
   }

   public void displayAccountDetails() {
       System.out.println("Account no.: ", accNo);
       System.out.println("User Name: " + userName);
       System.out.println("Account Balance: ", balance);
   }

}