google-guice example

Google-Guice:

Is a java framework to provide dependency injection (DI).

Basic advantages:

Your code will be easier to change, unit test and reuse in other contexts.

Official link:

http://code.google.com/p/google-guice/

My example:

public class AllInOne {

public interface DemoInt {

public String test();

}

public static class DemoImp implements DemoInt {

public String test() {

return "OK";

}

}

public static class Demo {

@Inject

private DemoInt injectedClass;

public String makeTest() {

return injectedClass != null ? injectedClass.test() : "ERROR";

}

}

public class DemoModule extends AbstractModule {

@Override

protected void configure() {

bind(DemoInt.class).to(DemoImp.class);

}

}

public AllInOne() {

Injector injector = Guice.createInjector(new DemoModule());

Demo demo = injector.getInstance(Demo.class);

System.out.println(demo.makeTest());

}

public static void main(String a[]) {

new AllInOne();

}

}