// functional/FunctionComposition.java

// (c)2017 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.util.function.*;

public class FunctionComposition {

static Function<String, String>

f1 = s -> {

System.out.println(s);

return s.replace('A', '_');

},

f2 = s -> s.substring(3),

f3 = s -> s.toLowerCase(),

f4 = f1.compose(f2).andThen(f3);

public static void main(String[] args) {

System.out.println(

f4.apply("GO AFTER ALL AMBULANCES"));

}

}

/* Output:

AFTER ALL AMBULANCES

_fter _ll _mbul_nces

*/