Why are there so many classes in Java?

Originally Answered: Why do we need to create multiple classes and methods in Java ? We don’t need to create multiple classes and methods in Java. We do so because it is practical to do so in many situations . Small and simple programs rarely benefit much from the use of various classes and methods.

How many classes can be defined in a single program? Explanation: Any number of classes can be defined inside a program, provided that their names are different . In java, if public class is present then it must have the same name as that of file. 10.

Some people recommend that 200 lines is a good limit for a class – not a method, or as few as 50-60 lines (in Ben Nadel’s Object Calisthenics exercise)and that a class should consist of “less than 10” or “not more than 20 ” methods.

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