Lambda Expression in Java
Quick notes on How to use the Lambda feature in new Java
Lambda expressions are a new and important feature included in Java SE 8. They provide a clear and concise way to represent one method interface using an expression. Java code can be improved with the inclusion of lambda expressions.
Syntax of Lambda Expression
(argument) -> (body)
A lambda expression is composed of three parts.
Argument List Arrow Token Body
(int x, int y) -> x + y
Simple Example for Lambda Expression
(int x, int y) -> x + y
() -> 42
(String s) -> { System.out.println(s); }
The first expression takes two integer arguments, named
x and y, and uses the expression form to return x+y. The second expression takes no arguments and uses the expression form to return an integer 42. The third expression takes a string and uses the block form to print the string to the console, and returns nothing.