how to restrict the variable not to access outside the class in java?

Question

I am using java. I know by using private access modifier we can restrict. But using Reflection API still I can access the variable outside the class. Then what is the use of private modifier here?

Answer 1

private prevents you accessing it from other classes using Java. However using JNI or a library you can do things differently. You can prevent reflection with a security manager but this is rarely needed.

Note: some libraries like Serialization need to be able to access private fields to work.