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// functional/MethodReferences.java

// (c)2021 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.*;

interface Callable { // [1]

void call(String s);

}

class Describe {

void show(String msg) { // [2]

System.out.println(msg);

}

}

public class MethodReferences {

static void hello(String name) { // [3]

System.out.println("Hello, " + name);

}

static class Description {

String about;

Description(String desc) { about = desc; }

void help(String msg) { // [4]

System.out.println(about + " " + msg);

}

}

static class Helper {

static void assist(String msg) { // [5]

System.out.println(msg);

}

}

public static void main(String[] args) {

Describe d = new Describe();

Callable c = d::show; // [6]

c.call("call()"); // [7]

c = MethodReferences::hello; // [8]

c.call("Bob");

c = new Description("valuable")::help; // [9]

c.call("information");

c = Helper::assist; // [10]

c.call("Help!");

}

}

/* Output:

call()

Hello, Bob

valuable information

Help!

*/