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. 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. The major use of abstract classes and methods is to achieve abstraction in Java. Abstraction is an important concept of object-oriented programming that allows us to hide unnecessary details and only show the needed information.
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