第169題

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.
答案：CF
參考：11-4 數字與日期/時間格式設定

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setMaximumFractionDigits(4); //小數點到四位數,超過則四捨五入.
setMinimumFractionDigits(2); // 小數點最少取兩位.