Question

Create a class named BankAccount, containing:

• a constructor accepting a String corresponding to the name of the account holder.
• a method, getBalance, that returns a double corresponding to the account balance.
• a method withdraw that accepts a double, and deducts the amount from the account balance.

Write a class definition for a subclass, CheckingAccount, that contains:

• a boolean instance variable, overdraft. (Having overdraft for a checking account allows one to write checks larger than the current balance).
• a constructor that accepts a String and a boolean. The String parameter is used in the invocation of the superclass (BankAccount) constructor, while the boolean is used to initialize the overdraft instance variable.
• a method, hasOverdraft, that returns a boolean. hasOverdraft returns true if the account supports overdraft.
• a method, clearCheck, that accepts a double and returns a boolean. clearCheck will determine if the amount (of the check) can be cashed-- this will be the case if the amount is less than the balance in the account, or if the account allows overdraft. If the check can be cashed, clearCheck returns true, and also calls the withdraw method to update the account balance; otherwise, clearCheck returns false.
• Java Language/ must be a superclass, subclass and main class

Answer 1

//BankAccount.java

public class BankAccount {

   private String name;
   private double balance;
   public BankAccount(String name) {
       this.name = name;
   }
  
   public void setBalance(double balance) {
       this.balance = balance;
   }

   public double getBalance() {
       return balance;
   }
  
   public void withdraw(double amount)
   {
       this.balance-=amount;
   }
  
  
}

//CheckingAccount.java

public class CheckingAccount extends BankAccount {
  
   private boolean overdraft;

   public CheckingAccount(String name,boolean od) {
       super(name);
       this.overdraft=od;
   }
   public boolean hasOverdraft()
   {
       return this.overdraft;
   }
  
   public boolean clearCheck(double amount) {
       if (amount<this.getBalance())
       {
           this.withdraw(amount);
           return true;
       }
       else if(this.hasOverdraft())
       {
           this.withdraw(amount);
           return true;
       }
       else
           return false;
   }
  

}

//Tester.java (maiin class)

public class Tester {

   public static void main(String[] args) {
       CheckingAccount acc1 = new CheckingAccount("David", true);//overdraft
       CheckingAccount acc2 = new CheckingAccount("Pete", false);//no overdraft
      
       acc1.setBalance(100);
       acc2.setBalance(100);
      
       System.out.println("Balance in acc1 before trying to clear check: "+acc1.getBalance());
       System.out.println("Balance in acc2 before trying to clear check: "+acc2.getBalance());
      
       System.out.println("Trying to cash check more than balance for acc1:"+acc1.clearCheck(101));
       System.out.println("Trying to cash check more than balance for acc2:"+acc2.clearCheck(101));;
      
      
       System.out.println("Balance in acc1 after trying to clear check: "+acc1.getBalance());
       System.out.println("Balance in acc2 after trying to clear check: "+acc2.getBalance());

   }

}