Abstract Class

Interface Class

Explanation

1

You call the class: abstract class + className

You call the class: interface + className

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2

You use the keyword: extends

You use the keyword: implements

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3

You can add methods that are already complete and you can add methods that are just a sketch

You only add sketches of methods

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4

You use variables

You only use constants

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5

You extend one Abstract Class

You can implement multiple Interfaces

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6

You can have a constructor

You CANNOT have a constructor, you can only have constants therefore there is no need for a constructor

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