Question

java

Objective: Create a class. Create objects. Use methods of a class.

1. Create a class BankAccount to represent a bank account according to the following requirements:

1. A bank account has three attributes: accountnumber, balance and customer name.
2. Add a constructor without parameters. In the initialization of the attributes, set the number and the balance to zero and the customer name to an empty string.
3. Add a constructor with three parameters to initialize all the attributes by specific values.
4. Add a constructor that allow to initialize the balance at a given number and the customer name with empty string and the account number by zero.
5. Add all the required setter methods
6. Add all the required getter methods
7. Add the method withdraw
8. Add the method deposit
1. Add the method reset that change the balance to zero

2. Create a tester class. In the main method:

1. Create one bank account using the first constructor and print its characteristics.
2. Create one bank account using the second constructor and print its characteristics.
3. Create one bank account using the third constructor and print its characteristics.
4. Deposit 1000 in each banc account.
5. Withdraw 500 from the first bank account, 200 from the second one.
6. Change the customer name of the third account.

Answer 1

Program

//class BankAccount
class BankAccount
{
   //data members
   int accountNumber;
   double balance;
   String customerName;
  
   //constructor without parameters
   public BankAccount()
   {
       accountNumber = 0 ;
       balance = 0;
       customerName = "";
   }
  
   //constructor with three parameters
   public BankAccount(int accountNumber, double balance, String customerName)
   {
       this.accountNumber = accountNumber;
       this.balance = balance;
       this.customerName = customerName;
   }
  
   //constructor that allow to initialize the balance at a given number
   public BankAccount(double balance)
   {
       this.accountNumber = 0;
       this.balance = balance;
       customerName = "";
   }  
  
   //setter methods
   public void setAccountNumber(int accountNumber)
   {
       this.accountNumber = accountNumber;
   }
  
   public void setBalance(double balance)
   {
       this.balance = balance;
   }
  
   public void setCustomerName(String customerName)
   {
       this.customerName = customerName;
   }
  
   //getter methods
   public int getAccountNumber()
   {
       return accountNumber;
   }
  
   public double getBalance()
   {
       return balance;
   }
  
   public String getCustomerName()
   {
       return customerName;
   }
  
   //method withdraw
   public void withdraw(double amount)
   {
       if(balance>amount)
           balance -= amount;
       else
           System.out.println("Not sufficient balance");
   }
  
   //method deposit
   public void deposit(double amount)
   {
       balance += amount;
       System.out.println("Balance = " + balance);
   }
  
   //method reset that change the balance to zero
   public void resetBalance()
   {
       balance = 0 ;
   }
  
   public String toString()
   {
       return "Account Number = " + accountNumber +", Balance = $" +
           balance + ", Customer Name = " + customerName;
   }
}

//tester class
class Tester
{
   // main method
   public static void main (String[] args)
   {
       //Create one bank account using the first constructor and print its characteristics.
       BankAccount ba1 = new BankAccount();
       System.out.println(ba1);
      
       //Create one bank account using the second constructor and print its characteristics.      
       BankAccount ba2 = new BankAccount(118897, 50000, "John");
       System.out.println(ba2);
      
       //Create one bank account using the third constructor and print its characteristics.
       BankAccount ba3 = new BankAccount(2500);
       System.out.println(ba3);
      
       //Deposit 1000 in each bank account
       ba1.deposit(1000);
       ba2.deposit(1000);
       ba3.deposit(1000);
      
       //Withdraw 500 from the first bank account, 200 from the second one.
       ba1.withdraw(500);
       ba2.withdraw(200);
      
       //Change the customer name of the third account
       ba3.setCustomerName("Johny");
      
   }
}

Output

Account Number = 0, Balance = $0.0, Customer Name =
Account Number = 118897, Balance = $50000.0, Customer Name = John
Account Number = 0, Balance = $2500.0, Customer Name =
Balance = 1000.0
Balance = 51000.0
Balance = 3500.0