» » » Java 8 java.util.function.Function with example program

  • java.util.function.Function introduced in java 8 for functional programming.
  • Function(T,R) will be used in streams where to take one type of  object and convert to another and return. 
  • And this Function() supports methods like apply(), andThen(), compose() and  identity() etc.
  • Lets see an example on java.util.function.Function.



#1: Java Example program on java.util.function.Function

  1. package com.instanceofjava.java8;

  2. import java.util.function.Function;
  3. /**
  4.  * @author www.Instanceofjava.com
  5.  * @category interview questions
  6.  * 
  7.  * Description: java 8 java.util.function.Function example program
  8.  *
  9.  */
  10. public class Java8Function {

  11. public static void main(String[] args) {
  12. Function<Integer, String> function = (n) -> {
  13. return "Number received: "+n;
  14. };

  15. System.out.println(function.apply(37));
  16. System.out.println(function.apply(64));

  17. }

  18. }

Output:

  1. Number received: 37
  2. Number received: 64

#2: Java example program on Function and explain used of addThen() and compose() methods



java 8 function example

Instance Of Java

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