Java™ How To Program (Early Objects), Tenth Edition

3.2.2 AccountTest Class That Creates and Uses an Object of Class Account

Next, we’d like to use class Account in an app and call each of its methods. A class that contains a main method begins the execution of a Java app. Class Account cannot execute by itself because it does not contain a main method—if you type java Account in the command window, you’ll get an error indicating “Main method not found in class Account.” To fix this problem, you must either declare a separate class that contains a main method or place a main method in class Account.

Driver Class AccountTest

To help you prepare for the larger programs you’ll encounter later in this book and in industry, we use a separate class AccountTest (Fig. 3.2) containing method main