95 lines
1.9 KiB
Java
95 lines
1.9 KiB
Java
// patterns/abstractfactory/GameEnvironment.java
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// (c)2021 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// An example of the Abstract Factory pattern.
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// {java patterns.abstractfactory.GameEnvironment}
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package patterns.abstractfactory;
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import java.util.function.*;
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interface Obstacle {
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void action();
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}
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interface Player {
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void interactWith(Obstacle o);
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}
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class Kitty implements Player {
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@Override
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public void interactWith(Obstacle ob) {
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System.out.print("Kitty has encountered a ");
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ob.action();
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}
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}
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class Fighter implements Player {
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@Override
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public void interactWith(Obstacle ob) {
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System.out.print("Fighter now battles a ");
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ob.action();
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}
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}
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class Puzzle implements Obstacle {
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@Override public void action() {
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System.out.println("Puzzle");
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}
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}
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class Weapon implements Obstacle {
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@Override public void action() {
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System.out.println("Weapon");
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}
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}
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// The Abstract Factory:
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class GameElementFactory {
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Supplier<Player> player;
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Supplier<Obstacle> obstacle;
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}
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// Concrete factories:
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class KittiesAndPuzzles
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extends GameElementFactory {
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KittiesAndPuzzles() {
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player = Kitty::new;
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obstacle = Puzzle::new;
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}
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}
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class Melee
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extends GameElementFactory {
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Melee() {
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player = Fighter::new;
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obstacle = Weapon::new;
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}
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}
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public class GameEnvironment {
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private Player p;
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private Obstacle ob;
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public
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GameEnvironment(GameElementFactory factory) {
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p = factory.player.get();
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ob = factory.obstacle.get();
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}
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public void play() {
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p.interactWith(ob);
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}
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public static void main(String[] args) {
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GameElementFactory
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kp = new KittiesAndPuzzles(),
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ml = new Melee();
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GameEnvironment
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g1 = new GameEnvironment(kp),
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g2 = new GameEnvironment(ml);
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g1.play();
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g2.play();
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}
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}
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/* Output:
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Kitty has encountered a Puzzle
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Fighter now battles a Weapon
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*/
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