设计模式之——简单工厂模式

　　就是建立一个工厂类，对实现了同一接口的一些类进行实例的创建。简单工厂模式的实质是由一个工厂类根据传入的参数，动态决定应该创建哪一个产品类（这些产品类继承自一个父类或接口）的实例。

示例代码：

/**
 * 产品的抽象接口  人类
 * @author liaowp
 *
 */
public interface Human {
    
    public void say();

}

/**
 * man  男人
 * @author liaowp
 *
 */
public class Man implements Human {

    /* say method
     * @see com.roc.factory.Human#say()
     */
    @Override
    public void say() {
        System.out.println("男人");
    }

}

/**女人
 * @author liaowp
 *
 */
public class Woman implements Human {

    /* say method
     * @see com.roc.factory.Human#say()
     */
    @Override
    public void say() {
        System.out.println("女人");
    }

}

/**
 * 简单工厂
 * @author liaowp
 *
 */
public class SampleFactory {
    public static Human makeHuman(String type){
        if(type.equals("man")){
            Human man = new Man();
            return man;
        }else if(type.equals("womman")){
            Human woman = new Woman();
            return woman;
        }else{
            System.out.println("生产不出来");
            return null;
        }            
    }
}

/**
 * 简单工厂放射实现
 * @author liaowp
 *
 */
public class SampleFactory1 {
    public static Human makeHuman(Class c){
        Human human = null;
        try {
            human = (Human) Class.forName(c.getName()).newInstance();
        } catch (InstantiationException e) {
            // TODO Auto-generated catch block
            System.out.println("不支持抽象类或接口");
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            System.out.println("没有足够权限，即不能访问私有对象");
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            System.out.println("类不存在");
            e.printStackTrace();
        }    
        return human;
    }
}

public class Client {
    public static void main(String[] args) {
//        Human man = SampleFactory.makeHuman("man");
//        man.say();
//        Human womman = SampleFactory.makeHuman("womman");
//        womman.say();
//        Human test = SampleFactory.makeHuman("tttt");
        
        Human man = SampleFactory1.makeHuman(Man.class);
        man.say();
        Human woman = SampleFactory1.makeHuman(Woman.class);
        woman.say();
    }
}