SCJP 1.6版考題 010
出自 陳富國維基館
1. import java.util.*;
2. public class Quest{
3. public static void main(String[] args){
4. String[] colors =
5. {"blue","red","green","yellow","orange"};
6. Arrays.sort(colors);
7. int s2 = Arrays.binarySearch(colors, "orange");
8. int s3 = Arrays.binarySearch(colors, "violet");
9. System.out.print(s2 + "" + s3);
10. }
11. }
What is the result?
A. 2-1
B. 2-4
C. 2-5
D. 3-1
E. 3-4
F. 3-5
G. Compilation fails.
H. An exception is thrown at runtime.
解答
Ans: C
解說:
字串被排完後是：blue, green, orange, red, yellow Arrays.binarySearch傳回鍵值在集合中的位置，orange在陣列索引2上 Arrays.binarySearch若找不到鍵值，傳回值是：(-(insertion point) – 1， insertion point是該鍵值在集合中的依其大小的插入點，violet應插入在yellow前，其插入點是4，-4-1得-5 (請參考JDK的說明)
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