Java Stream How to - Create Function lambda and call andThen method

Question

We would like to know how to create Function lambda and call andThen method.

Answer

// w w  w .  j  a va2  s.  co m
import java.util.function.Function;

public class Main {

  public static void main(String[] args) {
    Function<Integer, Integer> incrementer = (n) -> n + 1;
    Function<Integer, Integer> after = (n) -> n - 1;
    System.out.println(incrementer.andThen(after).apply(2));
  }

}

The code above generates the following result.