package innerclasses;

/**

* RUN:

* javac innerclasses/Factories.java && java innerclasses.Factories

* OUTPUT:

* Implementation1 method1

* Implementation1 method2

* Implementation2 method1

* Implementation2 method2

*/

public class Factories {

public static void serviceConsumer(ServiceFactory fact) {

Service s = fact.getService();

s.method1();

s.method2();

}

public static void main(String[] args) {

serviceConsumer(Implementation1.factory);

// Реализации полностью заменяемы!

serviceConsumer(Implementation2.factory);

}

}

interface Service {

void method1();

void method2();

}

interface ServiceFactory {

Service getService();

}

class Implementation1 implements Service {

private Implementation1() {}

public void method1() { System.out.println(getClass().getSimpleName() + " method1"); }

public void method2() { System.out.println(getClass().getSimpleName() + " method2"); }

public static ServiceFactory factory = new ServiceFactory() {

public Service getService() {

return new Implementation1();

}

};

}

class Implementation2 implements Service {

private Implementation2() {}

public void method1() { System.out.println(getClass().getSimpleName() + " method1"); }

public void method2() { System.out.println(getClass().getSimpleName() + " method2"); }

public static ServiceFactory factory = new ServiceFactory() {

public Service getService() {

return new Implementation2();

}

};

}