Ikk：新頁面: 1. class X{ 2. X(){System.out.print(1);} 3. X(int x){ 4. this(); 5. System.out.print(2); 6. } 7. } 8. public class Y extends X{ 9. Y(){ 10. super(6); 11....

2013-03-30T08:18:44Z

新頁面: 1. class X{ 2. X(){System.out.print(1);} 3. X(int x){ 4. this(); 5. System.out.print(2); 6. } 7. } 8. public class Y extends X{ 9. Y(){ 10. super(6); 11....

新頁面

1. class X{
2. X(){System.out.print(1);}
3. X(int x){
4. this();
5. System.out.print(2);
6. }
7. }
8. public class Y extends X{
9. Y(){
10. super(6);
11. System.out.print(3);
12. }
13. Y(int y){
14. this();
15. System.out.prin tln(4);
16. }
17. public static void main(String[] a){new Y(5);}
18.}

What is the result?

A. 13
B. 134
C. 1234
D. 2134
E. 2143
F. 4321

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<span style="font-size:medium;">解答</span>

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<span style="font-size: medium;">Ans: C </span>

<span style="font-size:medium;"> 解說:
此題follow本身建構子呼叫this()與父類別建構子呼叫super()的過程，即可跑出答案。

</span>
</div></div>
{{SCJP 1.6版考題講解}}

SCJP 1.6版考題 028 - 修訂歷史

Ikk：新頁面: 1. class X{ 2. X(){System.out.print(1);} 3. X(int x){ 4. this(); 5. System.out.print(2); 6. } 7. } 8. public class Y extends X{ 9. Y(){ 10. super(6); 11....