The error non static variable cannot be referenced from a static context in Java is mostly faced by the beginners at the time of compilation of Java program. The reason to occur this error is that they use a non-static member variable in the main() method.
What does Cannot be referenced from a static context mean?
The non-static variable cannot be referenced from a static context is compiler error that occurs when the user tries to put program code to access a non-static variable inside main in Java that is static.
How to fix non-static variable error in Java?
i.e. referring a variable using static reference implies to referring using the class name. But, to access instance variables it is a must to create an object, these are not available in the memory, before instantiation. Therefore, you cannot make static reference to non-static fields(variables) in Java.
How to convert static to non-static variable in Java?
You cannot refer non-static members from a static method. Non-Static members (like your fxn(int y)) can be called only from an instance of your class. or you can declare you method as static.