Guice系列之用户指南（七）

原文地址：https://code.google.com/p/google-guice/wiki/ToConstructorBindings

Constructor Bindings（构造器绑定）：在父类型上绑定子类实现的构造函数。

贴代码：

public interface Animal {
	void say();
}

import com.google.inject.AbstractModule;

public class AnimalModule extends AbstractModule {

	@Override
	protected void configure() {
		bind(String.class).toInstance("Tom");
		
		try {
			bind(Animal.class).toConstructor(Cat.class.getConstructor(String.class));
		} catch (NoSuchMethodException e) {
			addError(e);
		}
		
		System.out.println("run AnimalModule.configure()");
	}
}

public class Cat implements Animal {
	
	String name;
	
	public Cat(String name) {
		this.name = name;
		System.out.println("run Cat.constructor()");
	}
	
	@Override
	public void say() {
		System.out.println("i am a cat");
	}
	
	@Override
	public String toString() {
		return "name==>" + this.name;
	}
}

import com.google.inject.Guice;
import com.google.inject.Injector;

public class Test {
	public static void main(String[] args) {
		Injector injector = Guice.createInjector(new AnimalModule());
		Animal cat = injector.getInstance(Animal.class);
		System.out.println(cat);
		cat.say();
	}
}

执行结果：
run AnimalModule.configure()
run Cat.constructor()
name==>Tom
i am a cat

练习代码在这里