Web Reference: Jan 20, 2026 · If a class contains at least one abstract method, it must be declared as abstract; otherwise, a compile-time error occurs, since the class has an incomplete implementation and object creation must be restricted. 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 class and method in Java are used to achieve abstraction in Java. In this tutorial, we will learn about abstract classes and methods in Java with the help of examples.
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