Question

Code the following interfaces - An interface called Accountable with void withdraw(double) and double getPayment() methods, and an interface called AccountReceivable with a void deposit(double) method. Save these two interfaces in separate Java files. Then code a class, BusinessAccount, that implements the two interfaces defined above. Define and code the necessary instance variables and constructors. Override toString() so it will return the amount of a business account. Apply the particular operations, such as withdraw and deposit, required in implementing the interfaces. Create at least two objects of BusinessAccount with hard-coded data of your choice in the driver code to test the class.

Answer 1

Given below is the code for the question. Please do rate the answer if it helped. Thank you.

AccountReceivable.java
------
public interface AccountReceivable {
   public void deposit(double amt);
}

Accountable.java
-----
public interface Accountable{
   public void withdraw(double amt);
   public double getPayment();
}

BusinessAccount.java
-----

public class BusinessAccount implements Accountable, AccountReceivable
{
   private String name;
   private double balance;
  
   public BusinessAccount(String n, double bal){
       name = n;
       balance = bal;
   }
  
   public void withdraw(double amt){
       if(amt <= balance)
           balance -= amt;
   }
  
   public void deposit(double amt){
       if(amt > 0)
           balance += amt;
   }
  
   public double getPayment(){
       return balance;
   }
  
   public String toString(){
       return "Name: " + name + ", Balance: " + balance ;
   }
  
   public static void main(String[] args){
       BusinessAccount a1 = new BusinessAccount("John", 5000);
       BusinessAccount a2 = new BusinessAccount("Alice", 3000);
       a1.deposit(200);
       a2.withdraw(300);
       System.out.println("Balance in a1 = " + a1.getPayment());
       System.out.println(a1.toString());
       System.out.println(a2.toString());
   }
}

output
----
Balance in a1 = 5200.0
Name: John, Balance: 5200.0
Name: Alice, Balance: 2700.0