[PDF] abstract class vs interface with default methods

  • What is the difference between abstract class and interface with default methods?

    An abstract class can override Object class methods, but an interface can't. An abstract class can declare instance variables, with all possible access modifiers, and they can be accessed in child classes. An interface can only have public, static, and final variables and can't have any instance variables.20 oct. 2022

  • Are methods in the interface class abstract by default?

    By default, all methods are public and abstract until we do not declare it as default and properties are static and final.

  • Can interface only have default and abstract methods?

    Yes, Interfaces can only have abstract methods. In the Java programming language, an interface is a reference type, similar to a class, that can contain only constants, method signatures, default methods, static methods, and nested types.
  • By default, all the methods of an interface are public and abstract. An interface cannot contain concrete methods i.e. regular methods with body. In this way, we have learned about abstract method and its implementation in Java.
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