What are the rules to create a class in Java?

Designing a good class interface

Here are the steps you need to follow to create a class diagram.

The class name, with the initial letter capitalized by convention. The name of the class’s parent (superclass), if any, preceded by the keyword extends. A class can only extend (subclass) one parent. A comma-separated list of interfaces implemented by the class, if any, preceded by the keyword implements.

5 The Structure of Java Programs. Every Java program consists of a collection of classes–nothing else. A class is a template for creating a particular form of object . Each object created by the template contains the same members, each of which is either a field or a method.