![]() However, an interface may inherit multiple interfaces and a class may implement multiple interfaces. ![]() All classes in Java must have exactly one base class, the only exception being (the root class of the Java type system) multiple inheritance of classes is not allowed. One benefit of using interfaces is that they simulate multiple inheritance. Object references in Java may be specified to be of an interface type in each case, they must either be null, or be bound to an object that implements the interface. A class that implements an interface must implement all of the non-default methods described in the interface, or be an abstract class. Interfaces cannot be instantiated, but rather are implemented. At present, a Java interface can have up to six different types. Then, in Java 9, private and private static methods were added. Starting with Java 8, default : 99 and static : 7 methods may have implementation in the interface definition. All methods of an Interface do not contain implementation (method bodies) as of all versions below Java 8. Interfaces are declared using the interface keyword, and may only contain method signature and constant declarations (variable declarations that are declared to be both static and final). ![]() ![]() Concept in the Java computer programming languageĪn interface in the Java programming language is an abstract type that is used to declare a behavior that classes must implement. ![]()
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