反射——通过工厂类来完成获取接口示例

反射可实现程序中无new关键字，实现真正的解耦合

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Member;

/**
 * 只要是获取接口示例，都应该通过工厂类来完成
 */

interface IMessager {
    public void send(String msg);
}

class NewsPaper implements IMessager {
    @Override
    public void send(String msg) {
        System.out.println("【报纸报道】" + msg);
    }
}

class NetMessage implements IMessager {
    @Override
    public void send(String msg) {
        System.out.println("【网络消息】" + msg);
    }
}

class Factory {
    private Factory() {
    }

    public static IMessager getInstance(String className) {
        IMessager iMessager = null;
        try {
            iMessager = (IMessager) Class.forName(className).getDeclaredConstructor().newInstance();
        } catch (Exception e) {
        }
        return iMessager;
    }
}

public class TestDemo {
    public static void main(String[] args) {
        IMessager messager = Factory.getInstance("NewsPaper");   //获取指定的接口示例 可以传包+类名
        if (messager != null) {
            messager.send("www.baidu.com");
        }
    }
}