Implements vs extends: When to use? What's the difference?

Question

Please explain in an easy to understand language or a link to some article.

Answer 1

Extends is used when you want attributes of parent class/interface in your child class/interface and implements is used when you want attributes of an interface in your class.

Example:

1. Extends using class

   class Parent{

   }

   class Child extends Parent{

   }

2. Extends using interface

   interface Parent{

   }

   interface Child extends Parent{

   }

3. Implements

interface A{

}

class B implements A{

}

Combination of extends and implements

interface A{

}

class B

{

}

class C implements A,extends B{

}