198. Given: 11. public static Iterator reverse(List list){ 12. Collections.reverse(list)； 13. return list.iterator()； 14. } 15. public static void main(String[] args){ 16. List list= new ArrayList()； 17. list.add("1")； list.add("2")； list.add("3")； 18. for(Object obj : reverse(list)) 19. System.out.print(obj + ", ")； 20. } What is the result? (A) 3, 2, 1, (B) 1, 2, 3, (C) Compilation fails. (D) The code runs with no output. (E) An exception is thrown at runtime.

198. Given:

11. public static Iterator reverse(List list){

12. Collections.reverse(list)；

13. return list.iterator()；

14. }

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

16. List list= new ArrayList()；

17. list.add("1")； list.add("2")； list.add("3")；

18. for(Object obj : reverse(list))

19. System.out.print(obj + ", ")；

20. }

What is the result?
(A) 3, 2, 1,
(B) 1, 2, 3,
(C) Compilation fails.
(D) The code runs with no output.
(E) An exception is thrown at runtime.

答案：登入後查看
統計： A(4), B(1), C(5), D(0), E(0) #2720754

詳解 (共 1 筆)

kun kun

B1 · 2024/07/22

#6172451

200. Given: 11. public class Person{ 12. private String name； 13. public Person(String name){ 14. this.name = name； 15. } 16. public boolean equals(Object o){ 17. if(!(o instanceof Person)) return false； 18. Person p = (Person)o； 19. return p.name.equals(this.name)； 20. } 21. } Which statement is true? (A) Compilation fails because the hashCode method is not overridden. (B) A HashSet could contain multiple Person objects with the same name. (C) All Person objects will have the same hash code because the hashCode method is not overridden. (D) If a HashSet contains more than one Person object with name="Fred", then removing another Person, also with name="Fred", will remove them all.

詳解 (共 1 筆)

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