Question

In Java, is it better to use static members when modifying one variable in different scopes / modules, or to pass an object using arguments?

Answer 1

It shouldn’t be a technical question but a question of design. When you design your class, you separate the fields in class properties and instance properties. Here’s a simple example:

 public class Car {

   // every instance of "Car" has wheels -> static
   public static boolean hasWheels = true;

   // every instance of "Car" has an individual colour -> non static
   public Colour colour; 

   // ...
 }