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Created February 27, 2019 16:15
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[learn-Functional Interfaces] #java
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learn-Functional Interfaces.md

Java 8 Functional Interfaces

Being object oriented is not bad, but it brings a lot of verbosity to the program. Java 8 Functional Interfaces and Lambda Expressions help us in writing smaller and cleaner code by removing a lot of boiler-plate code.

  • An interface with exactly one abstract method is called Functional Interface. @FunctionalInterface annotation is added so that we can mark an interface as functional interface.
  • Some of the useful java 8 functional interfaces are Consumer, Supplier, Function and Predicate.

Lambda Expression

  • Objects are the base of java programming language and we can never have a function without an Object, that’s why Java language provide support for using lambda expressions only with functional interfaces.
  • Lambda Expressions syntax is (argument) -> (body).
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