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Editorial Team
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Asked: 2026-05-27T18:05:11+00:00

In Guice’s documentation, the chapter about Untargetted Bindings presents this example: bind(AnotherConcreteClass.class).in(Singleton.class); What does

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In Guice’s documentation, the chapter about Untargetted Bindings presents this example:

bind(AnotherConcreteClass.class).in(Singleton.class);

What does the in() do? The doc doesn’t mention what it is for.

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  1. Editorial Team

    It’s just the scope I think. It also accept the Scopes enum – either Singleton or NO_SCOPE.

    A scope is a level of visibility that instances provided by Guice may
    have. By default, an instance created by the Injector has no scope,
    meaning it has no state from the framework’s perspective — the
    Injector creates it, injects it once into the class that required it,
    and then immediately forgets it. Associating a scope with a particular
    binding allows the created instance to be “remembered” and possibly
    used again for other injections.

    http://google-guice.googlecode.com/svn/tags/3.0/javadoc/com/google/inject/Scopes.html#SINGLETON

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