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. }