What is an interface? Explain with an example using java

What is an interface? Explain with an example using java.

A class that implements an interface is compelled to implement all the methods that have been declared in the interface.

For a class to successfully compile, it should have implemented all the methods in the interface. This way, the interface makes the behavior of the class formal by defining its behaviour.

   return_type method1_name();
   return_type method2_name();

   return_type method1_name()
       //implementation method1
       //implementation method2

Advantages and disadvantages of interfaces.


- Interfaces are mainly used to provide polymorphic behavior.
- Interfaces function to break up the complex designs and clear the dependencies between objects.


- Java interfaces are slower and more limited than other ones.
- Interface should be used multiple number of times else there is hardly any use of having them.
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