Arrays and Array Lists - Java Concepts - page 439

7 {
8 Bank firstBankOfJava = new Bank();
9 firstBankOfJava.addAccount( new
BankAccount( 1001 , 20000 ));
10 firstBankOfJava.addAccount( new
BankAccount( 1015 , 10000 ));
11 firstBankOfJava.addAccount( new
BankAccount( 1729 , 15000 ));
12
13 Scanner in = new Scanner(System.in);
14
15 double threshold = in.nextDouble();
16 int c = firstBankOfJava.count(threshold);
17 System.out.println( "Count: " + c);
18 int expectedCount = in.nextInt();
19 System.out.println( "Expected: " +
expectedCount);
20
21 int accountNumber = in.nextInt;
22 BankAccount a =
firstBankOfJava.find(accountNumber);
23 if (a == null )
24 System.out.println( "No matching
account" );
25 else
26 {
27 System.out.println( "Balance of
maatching account: "
28 + a.getBalance());
29 int matchingBalance = in.nextLine();
30 System.out.println( "Expected: " +
matchingBalance);
31 }
32 }
33 }

319
320

Rather than using fixed values for the threshold and the account number to be found,
the program reads these values, and the expected responses. By running the program
with different inputs, we can test different scenarios, such as the ones for diagnosing
off-by-one errors discussed in Common Error 6.2 .

Of course, it would be tedious to type in the input values by hand every time the test
is executed. It is much better to save the inputs in a file, such as the following: