Guice Beginner - 如何绑定具体类？ [英] Guice Beginner - How to bind concrete classes?

问题描述

我有这个课程：

public class House {
    private final Door door;
    private final Window window;
    private final Roof roof;

    @Inject
    public House(Door door, Window window, Roof roof) {
        this.door = door;
        this.window = window;
        this.roof = roof;
    }
}

其中门， Window 和 Roof 是具体的类。现在如果我想为这个场景实现一个模块，我会这样做：

Where Door, Window and Roof are concrete classes. Now if I want to implement a Module for this scenario, I would do it like this:

public class HouseModule extends AbstractModule {
    @Override
    protected void configure() {
        bind(Door.class).to(Door.class);
        bind(Window.class).to(Window.class);
        bind(Roof.class).to(Roof.class);
    }
}

但我想知道这是否是正确的绑定方式具体课程，或者有更简单的方法。我觉得有一种更简单的方法。

But I wonder if this is the right way to bind concrete classes, or if there are easier ways. I feel there is an easier way to this.

编辑

刚试过这个，它似乎不起作用：

Just tried this out, and it doesn't seem to work:

1) Binding points to itself.
  at de.tarent.guice.ex._1.HouseModule.configure(HouseModule.java:10)

编辑2

似乎根本不需要绑定：

Injector injector = Guice.createInjector();
House house = injector.getInstance(House.class);

似乎也有效。

推荐答案

Guice的即时绑定完全符合您的要求。鉴于您的门，窗口和屋顶符合以下要求（引自Guice 文档）：

Guice's Just-In-Time binding does exactly what you want. Given your Door, Window and Roof meet following requirements (quoted from the Guice documentation):

是公共的，无参数的构造函数，还是带有@Inject批注的构造函数

either a public, no-arguments constructor, or a constructor with the @Inject annotation

一个空的模块实现将足够了：

an empty Module implementation will be sufficient:

public class HouseModule extends AbstractModule {
    @Override
    protected void configure() {
    }
}

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