Test Program

We have enough code to put together a test program. The test program will not do much, but it will compile and run.

class CheckingAccount
{
  // instance variables
  String accountNumber;
  String accountHolder;
  int    balance;

  //constructors
  CheckingAccount( String accNumber, String holder, int start )
  {
    accountNumber = accNumber ;
    accountHolder = holder ;
    balance       = start ;
  }

  // methods
}

class CheckingAccountTester
{
  public static void main( String[] args )
  {
    CheckingAccount account1 
            = new CheckingAccount( "123", "Bob", 100 );

    System.out.println( account1.accountNumber + " " +
        account1.accountHolder + " " + account1.balance );
  }
}

This program can be copied to a file, compiled, and run in the usual way. The output will be:

C:\chap32>javac CheckingAccountTester.java
C:\chap32>java CheckingAccountTester

123 Bob 100

If you prefer, you could put each class in its own source file and then compile as above. The results will be the same. With an IDE, you can test the CheckingAccount class without a tester program.

QUESTION 8:

What does the expression account1.accountNumber mean? (Look in the println statement to see where this expression was used.)

Answer:

Test Program

QUESTION 8: