How do I refrence a non- static method from a static context

Question

I have this constructor with a function however when i compile my main method i non-static method area cannot be referenced from a static context. I know its a simple fix i just

Answer 1

You have 2 options.

1. Make the method static.
2. Create an instance of the class which implements the method and call the method using the instance.

Which one to chose is purely a design decision.

Answer 2

You would need to call the method on an instance of the class.

This code:

Rect rect = new Rect (x, y, height, width);
double area = Rect.area();

Should be:

Rect rect = new Rect (x, y, height, width);
double area = rect.area();
              ^ check here
                you use rect variable, not Rect class
                Java is Case Sensitive