Ikk：新頁面: Given: 11. class Converter{ 12. public static void main(String[] args){ 13. Integer i = args[0]; 14. int j = 12; 15. System.out.println("It is " + (j==i) + " that j==i.")...

2013-03-30T04:16:45Z

新頁面: Given: 11. class Converter{ 12. public static void main(String[] args){ 13. Integer i = args[0]; 14. int j = 12; 15. System.out.println("It is " + (j==i) + " that j==i.")...

新頁面

Given:
11. class Converter{
12. public static void main(String[] args){
13. Integer i = args[0];
14. int j = 12;
15. System.out.println("It is " + (j==i) + " that j==i.");
16. }
17. }

What is the result when the programmer attempts to compile the code and run it with the command java Converter 12?
A. It is true that j==i.
B. It is false that j==i.
C. An exception is thrown at runtime.
D. Compilation fails because of an error in line 13.

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

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

<span style="font-size:medium;"> 解說:
args的每一個元素皆是字串，無法指定給Integer型態(型態不符)
改為：Integer i = Integer.parseInt(args[0]);

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{{SCJP 1.6版考題講解}}

SCJP 1.6版考題 117 - 修訂歷史

Ikk：新頁面: Given: 11. class Converter{ 12. public static void main(String[] args){ 13. Integer i = args[0]; 14. int j = 12; 15. System.out.println("It is " + (j==i) + " that j==i.")...