import com.google.inject.BindingAnnotation;
import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
@BindingAnnotation
@Target({FIELD, PARAMETER, METHOD })
@Retention(RUNTIME)
public @interface Tom {
}
public interface Animal {
void say();
}
public class Cat implements Animal{
@Override
public void say() {
System.out.println("i am a cat");
}
}
public class Dog implements Animal{
@Override
public void say() {
System.out.println("i am a dog");
}
}
public interface HelloService {
void sayHello();
}
import com.google.inject.Inject;
public class HelloServiceImpl implements HelloService {
Animal animal;
@Inject
public HelloServiceImpl(@Tom Animal animal) {
this.animal = animal;
}
@Override
public void sayHello() {
System.out.println(animal.getClass().getSimpleName());
animal.say();
}
}
import com.google.inject.AbstractModule;
public class HelloServiceModule extends AbstractModule {
@Override
protected void configure() {
bind(Animal.class).annotatedWith(Tom.class).to(Cat.class);
bind(Animal.class).to(Dog.class);
bind(HelloService.class).to(HelloServiceImpl.class);
}
}
public class Test {
public static void main(String[] args) {
Injector injector = Guice.createInjector(new HelloServiceModule());
HelloService helloService = injector.getInstance(HelloService.class);
helloService.sayHello();
}
}
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