Guice：当我在构造函数上有过多的 @Inject 时会发生什么
我有一个类 SomeClass 和一个 SomeModule 来向 Guice 注册它。
我发现构造函数 SomeClass 仅由 SomeModule 调用，并且 SomeModule 是唯一绑定 SomeClass 的地方代码> 发生。
这意味着 SomeClass 的构造函数上的 @Inject 是不需要的，因为 prop1 和 prop2 被注入到 < code>SomeModule 并传递给构造函数。测试似乎也证明了我的发现。
我的问题是，当 Guice 看到这样的 @Inject 时会做什么？
另外如果我的@Inject过多会有什么副作用？
public static class SomeModule extends PrivateModule {
@Provides
@Singleton
@Exposed
private SomeClass someClass( SomeObject prop1, String prop2) {
return new SomeClass(prop1, prop2);
}
}
public class SomeClass {
@Inject // unnecessary
public SomeClass(SomeObject prop1, String prop2){
...
}
}
如果我的理解是正确的，当你想将 Guice 管理的对象注入到构造函数的参数中时，你可以使用 @Inject 构造函数。
例如，如果我有 bind(SomeClass.class).in(Singleton.class) 以及 prop1 和 prop2 的绑定，则 < code>@Inject SomeClass 构造函数，以便将 prop1 和 prop2 注入到构造函数中。
但由于情况并非如此，这使得这里的 @Inject 不必要了
干杯
I have a class SomeClass and a SomeModule to register it with Guice.
I found out that the constructor SomeClass is only called by SomeModule, and that SomeModule is the only place where binding for SomeClass happens.
This means that the @Inject on SomeClass's constructor is not needed since prop1 and prop2 are injected inside SomeModule and passed to the constructor. And the testing also seems to prove my findings.
My question is that what Guice will do when it sees a @Inject like this?
Also what side effect will there be if I have an excessive @Inject?
public static class SomeModule extends PrivateModule {
@Provides
@Singleton
@Exposed
private SomeClass someClass( SomeObject prop1, String prop2) {
return new SomeClass(prop1, prop2);
}
}
public class SomeClass {
@Inject // unnecessary
public SomeClass(SomeObject prop1, String prop2){
...
}
}
If my understanding is correct, you @Inject a constructor when you want to inject objects managed by Guice into the parameters of the constructor.
e.g. if I have bind(SomeClass.class).in(Singleton.class) and bindings for prop1 and prop2, it makes sense to @Inject SomeClass constructor in order to inject prop1 and prop2 into the constructor.
But since this isn't the case, this makes the @Inject here unnecessary
Cheers
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（1）
引用@Deepak的评论作为答案：
Quoting @Deepak's comment as the answer: