Ikk：新頁面: Given: 1. public class LineUp{ 2. public static void main(String[] args){ 3. double d = 12.345; 4. //insert code here 5. } 6. } Which code fragment, inserted a...

2013-03-30T03:04:41Z

新頁面: Given: 1. public class LineUp{ 2. public static void main(String[] args){ 3. double d = 12.345; 4. //insert code here 5. } 6. } Which code fragment, inserted a...

新頁面

Given:
1. public class LineUp{
2. public static void main(String[] args){
3. double d = 12.345;
4. //insert code here
5. }
6. }

Which code fragment, inserted at line 4, produces the output |12.345|?
A. System.out.printf("|%7d| \n", d);
B. System.out.printf("|%7f| \n", d);
C. System.out.printf("|%3.7d| \n", d);
D. System.out.printf("|%3.7f| \n", d);
E. System.out.printf("|%7.3d| \n", d);
F. System.out.printf("|%7.3f| \n", d);

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

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

<span style="font-size:medium;"> 解說:
printf是Java在JDK

1.5提供C時代超級好用的printf格式化輸出，
%d是對應的輸出是10進位值(decimal)，%f是float
7.3則是整數7位小數點3位。
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{{SCJP 1.6版考題講解}}

SCJP 1.6版考題 147 - 修訂歷史

Ikk：新頁面: Given: 1. public class LineUp{ 2. public static void main(String[] args){ 3. double d = 12.345; 4. //insert code here 5. } 6. } Which code fragment, inserted a...