attrash kumar

Where do we need to implement inner classes ? Can any one provide few scenario's where we are compelled to use inner classes or inner class seems to be the obvious choice other any other implementation ?

Jeanne Boyarsky wrote:The concept is new. A functional interface is an interface with one abstract method. This definition is important in Java 8 because you can use functional interfaces with functional programming more easily.

Can you please explain it with an example?

What is something new in functional interface which was not already existing in Java 7 ?