public class CheckingAccount extends BankAccount
{
   // Inherits:
   //    Variables: accNum, name, balance
   //    Methods:   deposit(amount), withdraw(amount)

   /* ----------------------------------------------
      Constructor: CheckingAccount(a, n, amount)
      ---------------------------------------------- */
   public CheckingAccount(int a, String n, double amount)
   {
      accNum = a;          // Cannot access private variables
      name = n;            // in the base class BankAccount !
      balance = amount;
   }

   /* --------------------------------------------------
      transfer(toAccount, amount)

      I left the "this" parameter to make it clearer.
      You can OMIT "this" in the program below !
      -------------------------------------------------- */
   public void transfer( BankAccount toAccount, double amount )     
   {
      this.withdraw(amount);      // deduct amount from this account;    
      toAccount.deposit(amount);  // add amount to "toAccount";
   }
}