Project Lambda is an effort to bring Java into the world of functional programming. 

Lambda is a function without a name. It is an implementation of functional interfaces. A functional interface is an interface that has only a single custom abstract method that isn’t inherited from the object class. In Java, interfaces such as Runnable, Comparable, and many others are the example of Functional Interfaces. It defines an anonymous implementation for one-time use and significantly streamlines your code.

Source de l’article sur DZONE