67 lines
1.4 KiB
Java
67 lines
1.4 KiB
Java
// interfaces/Factories.java
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// (c)2016 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://mindviewinc.com/Books/OnJava/ for more book information.
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interface Service {
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void method1();
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void method2();
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}
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interface ServiceFactory {
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Service getService();
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}
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class Service1 implements Service {
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Service1() {} // Package access
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public void method1() {
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System.out.println("Service1 method1");
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}
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public void method2() {
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System.out.println("Service1 method2");
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}
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}
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class Service1Factory implements ServiceFactory {
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@Override
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public Service getService() {
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return new Service1();
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}
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}
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class Service2 implements Service {
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Service2() {} // Package access
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public void method1() {
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System.out.println("Service2 method1");
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}
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public void method2() {
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System.out.println("Service2 method2");
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}
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}
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class Service2Factory implements ServiceFactory {
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@Override
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public Service getService() {
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return new Service2();
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}
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}
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public class Factories {
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public static void serviceConsumer(ServiceFactory fact) {
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Service s = fact.getService();
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s.method1();
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s.method2();
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}
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public static void main(String[] args) {
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serviceConsumer(new Service1Factory());
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// Services are completely interchangeable:
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serviceConsumer(new Service2Factory());
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}
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}
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/* Output:
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Service1 method1
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Service1 method2
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Service2 method1
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Service2 method2
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*/
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