Jan 26, 2009 · If the functionality you are creating will be useful across a wide range of disparate objects, use an interface. Abstract classes should be used primarily for objects that are closely …

Feb 15, 2021 · Here, we have listed the best collection of 40 Java abstract class interview questions with answers. These abstract class interview questions can be asked in any …

Jun 1, 2023 · Abstract classes are preferred over interfaces in the following scenarios: 1. When a base class provides default implementations for some methods, while still requiring subclasses …

Aug 17, 2020 · How to choose when to use Interface and Abstract class in Java? Ans:- Choose Abstract class for following cases:- When you want to your class have abstract as well as non …

May 6, 2023 · 10 good questions about abstract class and interface asked in Java Interviews with answers. You can use this questions to test your knowledge of these two key design …

Aug 8, 2023 · In this article, we will look at frequently asked questions about abstract classes and interfaces that were asked at Java interviews at various levels. Most of them should be easy …

Feb 15, 2025 · Ans: An interface in Java is a mechanism that is used to achieve complete abstraction. It is basically a kind of class that contains only constants and abstract methods. 2. …

Mar 10, 2023 · Abstraction can be achieved in Java through the use of abstract classes and interfaces. a) An abstract class is a class that cannot be instantiated directly and must be …

A class implementing an interface must implement all of the methods defined in the interface, while a class extending an abstract class need not implement any of the methods defined in …

Mar 19, 2025 · Sample Answer: “Abstract classes and interfaces serve different design purposes in Java. Abstract classes contain both method declarations and implementations, allowing for …