SCJP 1.6版考題 169

Given:
12. NumberFormat nf = NumberFormat.getInstance();
13. nf.setMaximumFractionDigits(4);
14. nf.setMinimumFractionDigits(2);
15. String a = nf.format(3.1415926);
16. String b = nf.format(2);

Which two statements are true about The result if the default locale is Locale.US? (Choose two.)
 A. The value of b is 2.
 B. The value of a is 3.14.
 C. The value of b is 2.00.
 D. The value of a is 3.141.
 E. The value of a is 3.1415.
 F. The value of a is 3.1416.
 G. The value of b is 2.0000.

解答

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Ans: C F

解說:

 那二個敘述是真的？ 預設的locale是Locale.US
 nf.setMaximumFractionDigits(4);
 設定小數位置最大4位，若發生截位，則進行4捨5入，如F
 nf.setMinimumFractionDigits(2);
 設定小數位置最小2位，如C