9. interface constants

• An interface that defines constants

  
      public interface DepartmentConstants
      {
          int ADMIN = 1;
          int EDITORIAL = 2;
          int MARKETING = 3;
      }
  
  

  Note: all constants declared by the interface are static final. The above is identical to

  
      public interface DepartmentConstants
      {
          static final int ADMIN = 1;
          static final int EDITORIAL = 2;
          static final int MARKETING = 3;
      }
  
  

  For clarity reasons, the shorter version is prefered.