FAQ Why were default methods added to interfaces in Java 8?ĭefault methods are a feature introduced in Java 8 that allows us to provide a default implementation for a method in an interface. We can have any number of default method in an Interface.įurther, if want to learn more about the default methods, you can visit Oracle official documentation.Unlike regular interface methods, default method in interface has its implementation (method body).Hence, we don’t need to specify the public modifier. Similar to regular methods, default method in interface is also public implicitly.Default methods can’t be static & static methods can’t be default. Any method inside an Interface can’t be declared default & static together.They are not allowed inside classes, even if it is implemented class of that Interface. ![]() We can have Default methods (method with default keyword) only inside Interfaces as of Java 8.Let’s go through the table below to see the differences which are still in place. It doesn’t mean that both are similar now as we still have many differences between them. Since JDK 1.8 after the introduction of default method in interface, this difference becomes false. The major difference between the Interface & an abstract class before JDK 1.8 was that all the methods in an Interface are abstract by default while in an abstract class it is not necessary that all methods are abstract. ![]() interface Human Difference between Interface & Abstract class after introduction of default Method in Interface Further, we can’t force Implementing classes to override this method. For example, in the below code, walks() is a default method in interface Human. The default method in interface was introduced in JDK 8. We also call it defender method or virtual extension method. If we have an implemented method inside an interface with default keyword, then we will call it as a Default method.
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