when we go for interface and Abstract class in java

Question

Many books gives this impression, Can someone explain this may be with reallife example?

Answer 1

If u want multiple inheritance in java then u will use interface.
Interface is pure abstract class if u implements interface then it is necessary to override all methods of interface otherwise ur class become abstract class.

If u don't want multiple inheritance u will use Abstract class.

If u extends abstract class then overriding only necessary for abstract methods.

Comments

Any real life example ?

Answer 2

Always use an interface unless you need to ...

... provide subclasses with some state
... provide subclasses with default implementations of some methods
... want to defer implementation of some of the abstract methods

Note that you can only extend one class, while you can implement multiple interfaces. So if there's any chance that a subclass will need to extend some other class, strive for using an interface.

Comments

Any real life example ?