SCJP題庫第090題

11. interface DeclareStuff{

12.   public static final int EASY = 3;

13.   void doStuff(int t);}

14.   public class TestDeclare implements DeclareStuff{

15.   public static void main(String[] args){

16.     int x = 5;

17.     new TestDeclare().doStuff(++x);

18.   }

19.   void doStuff(int s){

20.     s += EASY + ++s;

21.     System.out.println("s " + s);

22.   }

23. }

What is the result?

A. s 14

B. s 16

C. s 10

D. Compilation fails.

E. An exception is thrown at runtime.

 

Ans: D

 

解說:

在DeclareStuff介面中宣告的doStuff方法存取屬性是public(在介面的方法存取屬性是public的)

TestDeclare要覆載doStuff方法，必須滿足overriding規則，19行需改為public void doStuff(int s)