Web Reference: 6 days ago · Interfaces can have default, static, and private methods (Java 8+ and 9+). Example: Defines constants and abstract methods, which are implemented by a class. Private methods can only be called inside default or static methods. Static methods are accessed using the interface name, not via objects. Another way to achieve abstraction in Java, is with interfaces. An interface is a completely " abstract class " that is used to group related methods with empty bodies: Interfaces form a contract between the class and the outside world, and this contract is enforced at build time by the compiler. If your class claims to implement an interface, all methods defined by that interface must appear in its source code before the class will successfully compile.
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