guice provides another way also to map bindings without creating a custom annoation. it allows so using @named annotation.

mapping using named annotation

bind(spellchecker.class).annotatedwith(names.named("openoffice")).to(openofficewordspellcheckerimpl.class);

inject using @named annotation

@inject
public texteditor(@named("openoffice") spellchecker spellchecker) {
   this.spellchecker = spellchecker;
}

complete example

create a java class named guicetester.

guicetester.java

import com.google.inject.abstractmodule;
import com.google.inject.guice;
import com.google.inject.inject;
import com.google.inject.injector;
import com.google.inject.name.named;
import com.google.inject.name.names;

public class guicetester {
   public static void main(string[] args) {
      injector injector = guice.createinjector(new texteditormodule());
      texteditor editor = injector.getinstance(texteditor.class);
      editor.makespellcheck();
   } 
}

class texteditor {
   private spellchecker spellchecker;
   

   @inject
   public texteditor(@named("openoffice") spellchecker spellchecker) {
      this.spellchecker = spellchecker;      
   }

   public void makespellcheck(){
      spellchecker.checkspelling(); 
   }  
}

//binding module
class texteditormodule extends abstractmodule {

   @override
   protected void configure() {
      bind(spellchecker.class).annotatedwith(names.named("openoffice"))
         .to(openofficewordspellcheckerimpl.class);
   } 
}

//spell checker interface
interface spellchecker {
   public void checkspelling();
}

//spell checker implementation
class spellcheckerimpl implements spellchecker {

   @override
   public void checkspelling() {
      system.out.println("inside checkspelling." );
   } 
}

//subclass of spellcheckerimpl
class openofficewordspellcheckerimpl extends spellcheckerimpl{
   @override
   public void checkspelling() {
      system.out.println("inside openofficewordspellcheckerimpl.checkspelling." );
   } 
}

output

compile and run the file, you will see the following output.

inside openofficewordspellcheckerimpl.checkspelling.