Java Language Tutorial => Interfaces

Introduction

An interface is a reference type, similar to a class, which can be declared by using interface keyword. Interfaces can contain only constants, method signatures, default methods, static methods, and nested types. Method bodies exist only for default methods and static methods. Like abstract classes, Interfaces cannot be instantiated—they can only be implemented by classes or extended by other interfaces. Interface is a common way to achieve full abstraction in Java.

Syntax

public interface Foo { void foo(); /* any other methods */ }
public interface Foo1 extends Foo { void bar(); /* any other methods */ }
public class Foo2 implements Foo, Foo1 { /* implementation of Foo and Foo1 */ }

Declaring and Implementing an Interface
Default methods
Extending an interface
Implementing interfaces in an abstract class
Implementing multiple interfaces
Modifiers in Interfaces
Strengthen bounded type parameters
Usefulness of interfaces
Using Interfaces with Generics

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Java Language

Java Language Interfaces

Fastest Entity Framework Extensions

Introduction

Syntax

Interfaces Related Examples

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