Web Reference: Jan 20, 2026 · In Java, an abstract class is a class that cannot be instantiated and is designed to be extended by other classes. It is used to achieve partial abstraction, where some methods are implemented while others are left for subclasses to define. Data abstraction is the process of hiding certain details and showing only essential information to the user. Abstraction can be achieved with either abstract classes or interfaces (which you will learn more about in the next chapter). Abstract classes are similar to interfaces. You cannot instantiate them, and they may contain a mix of methods declared with or without an implementation. However, with abstract classes, you can declare fields that are not static and final, and define public, protected, and private concrete methods. With interfaces, all fields are automatically pub...
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