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Factories.java
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78 lines (59 loc) · 1.67 KB
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package interfaces;
/**
* RUN:
* javac interfaces/Factories.java && java interfaces.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(new Implementation1Factory());
// Реализации полностью заменяемы!
serviceConsumer(new Implementation2Factory());
}
}
interface Service {
void method1();
void method2();
}
interface ServiceFactory {
Service getService();
}
class Implementation1 implements Service {
// visibility by package level
Implementation1() {}
public void method1() {
System.out.println(getClass().getSimpleName() + " method1()");
}
public void method2() {
System.out.println(getClass().getSimpleName() + " method2()");
}
}
class Implementation1Factory implements ServiceFactory {
public Service getService() {
return new Implementation1();
}
}
class Implementation2 implements Service {
// visibility by package level
Implementation2() {}
public void method1() {
System.out.println(getClass().getSimpleName() + " method1()");
}
public void method2() {
System.out.println(getClass().getSimpleName() + " method2()");
}
}
class Implementation2Factory implements ServiceFactory {
public Service getService() {
return new Implementation2();
}
}