[java] When do I have to use interfaces instead of abstract classes?

Actually Interface and abstract class are used to just specify some contract/rules which will just show, how their sub classes will be.

Mostly we know that interface is a pure abstract.Means there you cant specify a single method with body.This particular point is the advantages of abstract class.Means in abstract class u have right to specify method with body and without body as-well.

So if u want to specify something about ur subclass, then u may go for interface. But if u also want to specify something for ur sub classes and u want also ur class should also have some own method.Then in that case u may go for abstract class

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