工厂模式
2014-08-05 20:52
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我们在工厂对象上调用的是创建方法，而该工厂对象将生成接口的某个实现的对象。
通过这种方式，我们的代码将完全与接口的实现分离，就使得我们可以透明的将某个实现替换为另一个实现。
example 1：
output：
example 2：
output：
通过这种方式，我们的代码将完全与接口的实现分离，就使得我们可以透明的将某个实现替换为另一个实现。
example 1：
package source.gohome01;
interface Service {
void method1();
void method2();
}
interface ServiceFactory {
Service getService();
}
class Implementation1 implements Service {
Implementation1() {}
public void method1() { System.out.println("Implementation1 method1"); }
public void method2() { System.out.println("Implementation1 method2"); }
}
class Implementation2 implements Service {
Implementation2() {}
public void method1() { System.out.println("Implementation2 method1"); }
public void method2() { System.out.println("Implementation2 method2"); }
}
class Implementation1Factory implements ServiceFactory {
public Service getService() {
return new Implementation1();
}
}
class Implementation2Factory implements ServiceFactory {
public Service getService() {
return new Implementation2();
}
}
public class Factories {
public static void serviceConsumer(ServiceFactory fact) {
Service s = fact.getService();
s.method1();
s.method2();
}
public static void main(String[] args) {
serviceConsumer(new Implementation1Factory());
serviceConsumer(new Implementation2Factory());
}
}output：
example 2：
package source.gohome01;
interface Game { boolean move(); }
interface GameFactory { Game getGame(); }
class Checkers implements Game {
private int moves = 0;
private static final int MOVES = 3;
public boolean move() {
System.out.println("Checkers move " + moves);
return ++moves != MOVES ;
}
}
class CheckersFactory implements GameFactory {
public Game getGame() { return new Checkers(); }
}
class Chess implements Game {
private int moves = 0;
private static final int MOVES = 4;
public boolean move() {
System.out.println("Chess move " + moves);
return ++moves != MOVES ;
}
}
class ChessFactory implements GameFactory {
public Game getGame() { return new Chess(); }
}
public class Games {
public static void playGame(GameFactory factory) {
Game s = factory.getGame();
while(s.move())
;
}
public static void main(String[] args ) {
playGame(new CheckersFactory());
playGame(new ChessFactory());
}
}output：
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