// interfaces/MetalWork.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 onjava.Operation;

class Heat implements Operation {

@Override public void execute() {

Operation.show("Heat");

}

}

public class MetalWork {

public static void main(String[] args) {

// Must be defined in a static context

// to access a method reference:

Operation twist = new Operation() {

public void execute() {

Operation.show("Twist");

}

};

Operation.runOps(

new Heat(), // [1]

new Operation() { // [2]

public void execute() {

Operation.show("Hammer");

}

},

twist::execute, // [3]

() -> Operation.show("Anneal") // [4]

);

}

}

/* Output:

Heat

Hammer

Twist

Anneal

*/