简单工厂模式(Factory Pattern)

public interface Human 
{
    public void getColor();
    public void talk();
}

public class BlackHuman implements Human 
{

    @Override
    public void getColor() 
    {
        System.out.println("黑色");
    }

    @Override
    public void talk() 
    {
        System.out.println("黑人");
    }

}

public class WhiteHuman implements Human 
{

    @Override
    public void getColor() 
    {
        System.out.println("白色");
    }

    @Override
    public void talk() 
    {
        System.out.println("白人");
    }

}

public class YelloHuman implements Human 
{

    @Override
    public void getColor() 
    {
        System.out.println("黄色");
    }

    @Override
    public void talk() 
    {
        System.out.println("黄种人");
    }

}

public class HumanFactory {

    public static <T extends Human> T createHuman(Class<T> c) {
        
        Human human = null;
        
        try {
            human = (Human) Class.forName(c.getName()).newInstance();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        
        return (T) human;
    }
}

public class NvWa {

    /**
     * @param args
     */
    public static void main(String[] args) {

        Human white = HumanFactory.createHuman(WhiteHuman.class);
        white.getColor();
        white.talk();
        
        Human black = HumanFactory.createHuman(BlackHuman.class);
        black.getColor();
        black.talk();
        
        Human yellow = HumanFactory.createHuman(YelloHuman.class);
        yellow.getColor();
        yellow.talk();
    }

}