PicoContainer-Two minute tutorial

Authors: Jon Tirsen

This very short tutorial should get you up to speed with PicoContainer in 2 minutes. It does not go into why you should do it, read the Five minute introduction for that.
这是一个非常简短的是你能够快速掌握微容器的两分钟教程.如果它仍然不能是你确定为什么要使用微容器,你可以继续阅读5分钟介绍.

Download and install

Download the jar file and include it in your classpath.

Write two simple components
两个简单的组件

public class Boy {

    public void kiss(Object kisser) {

        System.out.println("I was kissed by "   kisser);

    }

}

public class Girl {

    Boy boy;



    public Girl(Boy boy) {

        this.boy = boy;

    }



    public void kissSomeone() {

        boy.kiss(this);

    }

}

Assemble components
装配组件

MutablePicoContainer pico = new DefaultPicoContainer();

pico.reGISterComponentImplementation(Boy.class);

pico.registerComponentImplementation(Girl.class);

Instantiate and use component
初始化并使用组件

Girl girl = (Girl) pico.getComponentInstance(Girl.class);

girl.kissSomeone();

The Girl does not reach out to find herself a Boy but instead is provided one by the container. This is called the Hollywood Principle or "Don't call us we'll call you".
Girl类没有自己去调用这个Boy类而是通过容器提供的,这就是著名的好莱坞规则“不要找我,我会找你的“.

Introduce an interface for the dependency
给从属类一个接口

Change the Boy class to implement a Kissable interface and change the Girl class to depend on Kissable instead.
将Boy类实现一个Kissable接口并且改变Girl类去引用一个Kissable对象.

public interface Kissable {
void kiss(Object kisser);
}

public class Boy implements Kissable {

    public void kiss(Object kisser) {

        System.out.println("I was kissed by "   kisser);

    }

}

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