1. interface DeclareStuff {2.   public static final int EASY = 3;3.   void doStuff(int t); }4. public class TestDeclare implements DeclareStuff {5.   public static void main(String [] args) {6.    int x = 5;7.    new TestDeclare().doStuff(++x);8.   }9.   void doStuff(int s) {10.    s += EASY + ++s;11.    System.out.println("s " + s);12.   }13. }