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public class Floor {

    private String color;   //大楼颜色

    int height;             //大楼高度

    /**

     * 构造方法

     */

    public  Floor() {

        System.out.println("我是Floor的构造方法");

    }

    /**

     * 获得color

     */

    public void getColor(){

        System.out.println(this.color);

    }

    /**

     * 大楼的功能

     * @param str

     */

    public void fun(String str){

        System.out.println(str);

    }

}

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public static void reflectMethod(Floor floor) throws InstantiationException, IllegalAccessException, NoSuchFieldException, SecurityException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException{

        //获得图纸:getClass

        Class<Floor> floorClass = (Class<Floor>) floor.getClass();

        //造楼:newInstance

        Floor newFloor = floorClass.newInstance();

        //属性赋值： 获得属性

        Field field = floorClass.getDeclaredField("color");

        //属性赋值：因为color的属性是private,所以得设置其可访问性

        field.setAccessible(true);

        field.set(newFloor, "白色");

       //查看是否设置成功

        newFloor.getColor();

        //获得方法:通过方法名和方法参数类型来区分

        Method method = floorClass.getDeclaredMethod("fun", String.class);

        //执行方法：

        method.invoke(newFloor, "教学楼");

    }