54 lines
1.3 KiB
Java
54 lines
1.3 KiB
Java
//: interfaces/Factories.java
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import static net.mindview.util.Print.*;
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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 Implementation1 implements Service {
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Implementation1() {} // Package access
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public void method1() {print("Implementation1 method1");}
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public void method2() {print("Implementation1 method2");}
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}
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class Implementation1Factory implements ServiceFactory {
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public Service getService() {
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return new Implementation1();
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}
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}
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class Implementation2 implements Service {
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Implementation2() {} // Package access
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public void method1() {print("Implementation2 method1");}
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public void method2() {print("Implementation2 method2");}
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}
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class Implementation2Factory implements ServiceFactory {
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public Service getService() {
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return new Implementation2();
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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 Implementation1Factory());
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// Implementations are completely interchangeable:
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serviceConsumer(new Implementation2Factory());
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}
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} /* Output:
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Implementation1 method1
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Implementation1 method2
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Implementation2 method1
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Implementation2 method2
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*///:~
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