Lambda Identity Function

Lambda package com.demo public class Test2 public static void mainString args

Java 8defaultstaticidentityFunction Function.identityLambdat -gt tLambda identity JDK

Identity function f x x 92displaystyle fxx

No, but for many such quotconstantquot functions it's easy to write your own lambda expression. In fact, one can write x -gt x instead of Function.identity and in some cases it's clearer. Here is a list of common constant functions and how they can be written using lambda. Predicate that always returns true or false x -gt true x -gt false

As of the current JRE implementation, Function.identity will always return the same instance while each occurrence of identifier -gt identifier will not only create its own instance but even have a distinct implementation class. For more details, see here.. The reason is that the compiler generates a synthetic method holding the trivial body of that lambda expression in the case of x-gtx

Function.identityt-gttlambdaFunction.identityt-gttlambdalambda

1.6w1437Java 8FunctionidentityLambdastr-gtstrmapToInt

Function.identityLambdat -gt tLambda identity JDK static Function identity return t -gt t Function.identity. TaskgetTitletaskkey

1.6kJava 8Function.identityLambdaStreamidentityt-gttt-gtt

Function.identity static ltTgt FunctionltT, Tgt identity return t -gt t Java 7 . identity Function.identity lambda