java - Google Guice 配置错误(未绑定(bind)实现)

Question

我对 Google Guice 框架有疑问。

我正在尝试创建一个简单的应用程序来注入(inject)对象列表。不幸的是，在尝试运行应用程序时，出现以下错误。

No implementation for java.util.List was bound. while locating java.util.List for field at Operator.carShops(Operator.java:17) while locating Operator ()

程序代码如下:

public class Main {
public static void main(String[] args) {
        Injector injector = Guice.createInjector();
        Operator operator = injector.getInstance(Operator.class);

        operator.prepareData();
}}



public class Operator implements IOperator {
@Inject
private List<CarShop> carShops;

public List<CarShop> getCarShops() {
    return carShops;                             <--- Place of error occurrence
}

public void setCarShop(List<CarShop> carShops) {
    this.carShops = carShops;
}

public void prepareData() { 
    for(CarShop carShop:carShops)
        for(int i=0;i<10;i++) {
            Car car = new Car();
            car.setPrice(1000);     
            carShop.addCar(car);
        }
}}

请帮忙

Answer 1

您的模块注册依赖项似乎丢失了。您需要告诉 Guice 在请求接口(interface)时将使用哪个类。

import com.google.inject.AbstractModule;

public class SimpleModule extends AbstractModule {

    @Override
    protected void configure() {
        bind(CarShop.class).to(CarShopImpl.class);
    }
}

其中 CarShopImpl 是 CarShop 接口(interface)的特定实现。

比方说，CarShopImpl 类的开头应该是:

public class CarShopImpl implements CarShop {

    // Implementation
}