是否可以通过反射调用私有属性或方法 [英] Is it possible to invoke private attributes or methods via reflection

问题描述

我试图通过反射获取静态私有属性的值，但它失败并出现错误。

I was trying to fetch the value of an static private attribute via reflection, but it fails with an error.

Class class = home.Student.class;
Field field = studentClass.getDeclaredField("nstance");
Object obj = field.get(null);

我得到的例外是：

java.lang.IllegalAccessException: Class com.test.ReflectionTest can not access a member of class home.Student with modifiers "private static".

此外，我需要使用以下代码调用私有。

Moreover, there is a private I need to invoke, with the following code.

Method method = studentClass.getMethod("addMarks");
method.invoke(studentClass.newInstance(), 1);

但问题是Student类是单例类，而构造函数是私有的，无法访问。

but the problem is the Student class is a singleton class, and constructor in private, and cannot be accessed.

推荐答案

您可以设置可访问的字段：

You can set the field accessible:

field.setAccessible(true);

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