Can we access the private method from outside the class?

According to object oriented rules, NO.

No not possible. Private modifiers are meant to be accessed only within that class.

no here we talks about a levet of security

about your question no

use setAccessible(true) on your Method object before using its invoke method for Java

and for C# and .net your can use the concept of friend or  System.Reflection class with InvokeMember .

This is good example on Java :

http://stackoverflow.com/questions//how-to-call-a-private-method-from-outside-a-java-class

I hope this info. is helpful to you .