SCJP題庫第147題
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);
Ans: F
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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