Constants: static final

• If constant values are needed in several methods, declare them together with the instance fields of a class and tag them as static and final
• Give static final constants public access to enable other classes to use them
  

  public class Math
  {
     . . .
     public static final double E = 2.7182818284590452354;
     public static final double PI = 3.14159265358979323846;
  }
  
  
  double circumference = Math.PI * diameter;