SCJP 1.6版考題 123

Given:
11. public static void parse(String str){
12.   try{
13.     float f = Float.parseFloat(str);
14.   }catch(NumberFormatException nfe){
15.     f = 0;
16.   }finally{
17.     System.out.println(f);
18.   }
19. }
20. public static void main(String[] args) {
21.   parse("invalid");
22. }


What is the result?
 A. 0.0
 B. Compilation fails.
 C. A ParseException is thrown by the parse method at runtime.
 D. A NumberFormatException is thrown by the parse method at runtime.

解答

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Ans: B

解說: F第15行與17行的f都是未宣告，宣告的f在第13行僅供try區塊中使用