What is interface ?

A Java keyword used to define a collection of method definitions and constant values. It can later be implemented by classes that define this interface with the "implements" keyword.:Interface contains all undefined methods and constant variables..this interface must implemented by atleast one class.:interface means uncompleted group of methods is called interface. inside interface every method is by default public and abstract.:interface means uncompleted group of methods is called interface. inside interface every method is by default public and abstract.
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