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copied!<p>I'd like to complement Marcin's response, by adding that you don't have to limit yourself to using <code>toInstance()</code> or provider methods in such a situation.</p> <p>The following will work just as well:</p> <pre><code>bind(Person.class).annotatedWith(Driver.class).to(MartyMcFly.class).in(Singleton.class); bind(Person.class).annotatedWith(Inventor.class).to(DocBrown.class).in(Singleton.class); </code></pre> <p>[...]</p> <pre><code>@Inject public BackToTheFuture(@Driver Person marty, @Inventor Person doc) { ... } </code></pre> <p>Guice will inject the dependencies as usual when instantiating the MartyMcFly and DocBrown classes.</p> <hr> <p>Note that it also works when you want to bind multiple singletons of the <strong>same type</strong>:</p> <pre><code>bind(Person.class).annotatedWith(Driver.class).to(Person.class).in(Singleton.class); bind(Person.class).annotatedWith(Inventor.class).to(Person.class).in(Singleton.class); </code></pre> <p>For this to work, you must make sure that <code>Person</code> is not bound in the Singleton scope, either explicitely in the Guice module, or with the <code>@Singleton</code> annotation. More details in <a href="https://gist.github.com/1156593" rel="nofollow noreferrer">this Gist</a>.</p> <p>Edit: The sample code I give as an example comes from a <a href="https://github.com/google/guice/blob/e7bef34ef6379735e2a58df1b23f351bb7e30e44/extensions/grapher/test/com/google/inject/grapher/demo/BackToTheFutureModule.java" rel="nofollow noreferrer">Guice Grapher Test</a>. Looking at the Guice tests is a great way to better understand how to use the API (which also applies to every project with good unit tests).</p>

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