Rule Definition
When an object is created: * Memory is allocated to all the fields * All super class fields are also allocated memory * All sub class fields, super class fields are initialized . * The constructor is invoked. Using a static avoid to create an object that takes resources when it is unnecessary.

Remediation
Make this method static.

Violation Code Sample

class Example {
    static double pi = 3.14;

    int min (int x, int y) { // VIOLATION
      return (x>y?y:x);
    }

    double getPi() {  // VIOLATION
       return pi;
    }

Fixed Code Sample

class Example {
    static double pi = 3.14;

    static int min (int x, int y) { // FIXED
      return (x>y?y:x);
    }

    static double getPi() {  // FIXED
       return pi;
    }

https://docs.oracle.com/javase/tutorial/java/javaOO/classvars.html