In Java, an interface is a reference type that defines a set of methods without providing any implementation for them. It specifies a contract that a class implementing the interface must follow, by defining the method signatures, but leaving the details of how those methods are implemented up to the implementing class.
An interface can contain abstract methods (which have no implementation) and default methods (which have a default implementation). It can also define constants and static methods.
To implement an interface, a class must use the "implements" keyword and provide implementations for all the methods defined in the interface. A class can implement multiple interfaces, but it must provide an implementation for all the methods defined in each interface it implements.
Interfaces are used extensively in Java for abstraction and to define contracts between different components of a software system. They provide a way to separate the contract from the implementation, making it easier to modify and extend the code without affecting other parts of the system.
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