java API------Arrays类binarySearch方法

//摘自ocjp:import java.util.*;public class Quest {public static void main(String[] args) {String[] colors = {"blue", "red", "green", "yellow", "orange"};Arrays.sort(colors);int s2 = Arrays.binarySearch(colors, "orange");int s3 = Arrays.binarySearch(colors, "violet");System.out.println(s2 + " " + s3);}}What is the result?A. 2 -1B. 2 -4C. 2 -5D. 3 -1E. 3 -4F. 3 -5G. Compilation fails.H. An exception is thrown at runtime.Answer: C

分析：

Arrays.binarySearch用法：若查找到，则返回key的位置；若未找到，则反回“-插入点”。（例中s3，若向colors中插入“violet”则下标为5）。