public class Class04
{
   /* ==============================================
      convToString(x): return a String containing
                       information of BankAccount x
      ============================================== */
   public static String convToString( BankAccount x )
   {
      return( "Account number: "  + x.accNum 
           + ", Name: "  + x.name
           + ", Balance: " + x.balance);
   }

   /* ==============================================
      deposit(x, amount): Add "amount" to x.balance
      ============================================== */
   public static void deposit( BankAccount x, double amount )
   {
      x.balance += amount;
   }

 
   public static void main(String[] args)
   {
      BankAccount stu1;
 
      stu1 = new BankAccount(); // Create one BankAccount object with 
                                // 3 data fields:
                                //    stu1.studID, stu1.name, stu1.major
 
      stu1.accNum = 12345;
      stu1.name = "Mary";
      stu1.balance = 1000.0;
    
      String x;
 
      x = Class04.convToString( stu1 );
      System.out.println("BankAccount 1: " + x); 
 
      Class04.deposit( stu1, 450 );

      x = Class04.convToString( stu1 );
      System.out.println("After depositing $450: " + x); 
   }
}