SCJP 1.6版考題 159

Given:
11. double input = 314159.26;
12. NumberFormat nf = NumberFormat.getInstance(Locale.ITALIAN);
13. String b;
14. //insert code here

Which code, inserted at line 14, sets the value of b to 314.159,26?
 A. b = nf.parse(input);
 B. b = nf.format(input);
 C. b = nf.equals(input);
 D. b = nf.parseObject(input);

解答

---

Ans: B

解說:

 14行插入那一行設定了b物件的值為314.159,26
 parse(剖析)的語意一般是從字串轉成所要的類別型態物件，如Integer.parseInt
 NumberFormat中的format方法是將數值以所指定的格式輸出，回傳值型態是String