[Solved] java.lang.NullPointerException: Attempt to invoke virtual method java.lang.String [duplicate]

Question

That method is not static so you will need an instance of stringFilter to invoke that method.

You are calling an instance method on a null instance of stringFilter

Accepted Answer

That method is not static so you will need an instance of stringFilter to invoke that method.

You are calling an instance method on a null instance of stringFilter