Java Tutorials: Difference between Interface & abstract class

interface vs abstract class:
When to use interface & when to use abstract class:

Design difference:
Interface
- When all functionalities are implemented differently as per different behaviour then choose interface as their interface is different though their behaviour is same.
- So as far as all classes are following a protocol (behaviour) but way of implemeting is different, choose interface.

abstract class:
- When some of the functaionalities are same, but some are implemented differently, then choose abstarct classes.
- So in abstract class, some of the implementation are same for all, but some are other, but in interface, all implementation are different.

Behaviour difference:
- Generally interface are utility method, which can be implemented by any classes like Comparator, but abstract classes are co-related
- You can not extends more than 1 class, but you can implement multiple interface, so a

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[venu]

Thanks for the video sessions to understand concepts with good explanation .

[abhishekmarubadi]

can you give any real time example for abstract class and inheritance..like really where this can be implemented in real time

[shirish]

in JAVA 8 Interface can do all what abstract class does