JavaExamples/JavaFunctionalExamples/src/JavaFunctionalExample2/CompositionExampleClass.java at master · Cuica20/JavaExamples

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package JavaFunctionalExample2;

import java.util.function.Function;

public class CompositionExampleClass {

public static void main(String[] args) {

// TODO Auto-generated method stub

// Here we declare two functions. Function 1 (times)

// takes one integer and returns an integer.

// Function 2 (squared) also takes one integer and

// returns one integer.

Function<Integer, Integer> times2 = e -> e * 2;

Function<Integer, Integer> squared = e -> e * e;

// Here we use both the compose and the andThen statements

Integer composed = times2.compose(squared).apply(4);

Integer AndThen = times2.andThen(squared).apply(4);

// Note that compose executes the second (i.e. parameterized)

// function first, and then the first function second.

// andThen executes the first function and then the second one.

System.out.println("composed = " + composed);

System.out.println("andThen = " + AndThen);

}