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1 Abstract classes can have methods with implementation whereas interface provides absolute abstraction and canât have any method implementations. 2  Abstract classes can have constructors but interfaces canât have constructors. 3  Abstract class have all the features of a normal java class except that we canât instantiate it.
When a Class implements an Interface are forced by the compiler to write the methods and Properties that the Interface has defined. That is, if you implement an Interface in your Class you have to declare all of the Interface's Events, Methods, Properties in your Class. An Interface can have only Abstract methods and Constants, which are always implicitly public, static, and final.