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 abstract keyword is a non-access modifier, used for classes and methods: Abstract class: is a restricted class that cannot be used to create objects (to access it, it must be inherited from another class).
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