反射的使用

        Apple apple = new Apple("香", 34.8f);
        
        Field field = Apple.class.getDeclaredField("price");
        
        Field[] fields = Apple.class.getFields();
        
        for (Field field2 : fields) {
            System.out.println(field2.getName());
        }
        
        System.out.println("-----");
        
        fields = Apple.class.getDeclaredFields();
        for (Field field2 : fields) {
            System.out.println(field2.getName());
        }
        
        System.out.println("-----");
        field.setAccessible(true);
        
        float money = field.getFloat(apple);
        System.out.println(money);