反射与工厂设计模式

一、定义接口

interface  IFuit{
    void eat();
}

二、定义类实现接口 

class Apple implements IFuit{

    @Override
    public void eat() {
        System.out.println ("吃苹果" );
    }
}
class Orange implements IFuit{
    @Override
    public void eat() {
        System.out.println ("吃橘子" );
    }
}
class FruitFactory{
    private FruitFactory(){
    }
    public static IFuit getFuitInstance(String className) throws ClassNotFoundException, IllegalAccessException, InstantiationException {
      Class classz =  Class.forName ( className );

            return (IFuit) classz.newInstance ();
    }
}

三、测试 

public class Test {
public static void main(String[] args) throws IllegalAccessException, InstantiationException, ClassNotFoundException { ;
        IFuit fuit=FruitFactory.getFuitInstance ( "反射.Apple" );
        fuit.eat ();
    }
}

四、运行结果