Java interface static how to#
Java interface static update#
Java interface static code#

Public void frontCamera() //overriding default method The default method ' frontCamera()' is overridden by the ABCPhone class now.

This is the next version to the above program. To override any method of an interface including the default method, use the public access modifier to escape compiler errors. Now, all existing implementations run successfully of course without the new method frontCamera().īelow example program overrides the default method in an Interface. So, Java-8 simply added the keyword ' default' in the place of ' abstract' before the new method. If it is an abstract method, it breaks all the existing implementations of the Phone interface. Later, someone has upgraded the Phone interface to support another method ' frontCamera()'. In the above example, the developer implemented only the first abstract method backCamera() of the interface Phone. we are still using the old version code.ĭefault void frontCamera() //Will not break existing implementations

Java interface static update#

developer added this method in next update Look at the below example program that clearly explains Java default method usage in the real world. You can override the default method of the interface later at the time of updating your implementor-class. So, developers can use either Old runtime or new runtime libraries to successfully run the existing project or program.

Java interface static code#

So, the Java Runtime does not throw an exception for missing implementations for new abstract methods found in the updated interfaces.ĭefault return-type METHOD_NAME(Parameters)Ī Java default method allows a developer to add new functionality or feature to the Source code without bothering about breaking the dependencies and usages. Java interface default method avoids the need for updating the own source code immediately.

Updating the own project code and compiling it to avail the new features.

Updating the project Runtime Environment with the latest Java libraries containing classes and interfaces.

There are two things Java developers take care of. It uses the public access modifier by default. The default method in a Java interface is a concrete (non-abstract) method that will be called at runtime if the implementation is missed by the implementor class due to Source code changes.Ī Java default method can not be declared static or abstract or private or protected. The compiler throws an error. Note: The keyword 'default' is also used with SWITCH CASE control statements. Let us know more with examples in this Last Minute Java Tutorial.

These are against the concept of an interface is a 100% abstract class.

Java interface static how to#

Let's see how to declare default methods in the interface.Java 1.8 or Java 8 introduced new features in Interface namely STATIC method and Java DEFAULT method. The reason behind adding the default method is to allow the developers to add new methods to the interfaces without affecting the classes that implement these interfaces. Methods that are declared using the default keyword inside the interface are known as default methods. Now lets see what is default and static methods. It contains only abstract methods and does not provide any implementation but In Java 8, Interface is improved by adding default and static methods. Interface in Java is a concept that is used to achieve abstraction.