public class BankAccount
{
   private int accNum;              // Private access
   private String name;             // -- limit to ONLY inside
   private double balance;          // the class "BankAccount"

   /* ====================================================
      Constructor 1: initialize all 3 instance variables
      ==================================================== */
   BankAccount(int a, String n, double amount)
   {
      accNum = a;
      name = n;
      balance = amount;
   }
 
   /* ====================================================
      Default Constructor 
      ==================================================== */
   BankAccount( )
   {
      accNum = -1;
      name = "Nobody";
      balance = 0.0;
   }
 
   /* ==============================================
      convToString(): return a String containing
                        information of BankAccount
      ============================================== */
   public String convToString(  )
   {
      return( "Account number: "  + this.accNum
           + ", Name: "  + this.name
           + ", Balance: " + this.balance);
   }
 
   /* ==============================================
      deposit(amount): Add "amount" to balance
      ============================================== */
   public void deposit( double amount )     
   {
      this.balance += amount;
   }

   /* ======================================================
      withdraw(amount): Subtract "amount" from balance
      ====================================================== */
   public void withdraw( double amount )
   {
      if ( this.balance >= amount )
         this.balance -= amount;   // Subtract "amount" from balance
   }
}