java折半查找（递归版）

 1 import java.util.Scanner;
 2 
 3 /**
 4  * @author Administrator 递归算法折半查找
 5  */
 6 public class zhebanchazhao_1 {
 7 
 8     public static void main(String[] args) {
 9 
10         int[] a = new int[100];
11         int x;
12         Scanner cin = new Scanner(System.in);
13 
14         x = cin.nextInt();
15         for (int i = 0; i < x; i++) {
16             a[i] = cin.nextInt();
17         }
18         int b = cin.nextInt();
19         System.out.println(IterBiSearch(a, b, 0, x));
20 
21     }
22 
23     public static int IterBiSearch(int data[], int x, int beg, int last) {
24         int mid = -1;
25         mid = (beg + last) / 2;
26         if (x == data[mid]) {
27             return mid;
28         } else if (x < data[mid]) {
29             return IterBiSearch(data, x, beg, mid - 1);
30         } else if (x > data[mid]) {
31             return IterBiSearch(data, x, mid + 1, last);
32         }
33         return -1;
34     }
35 
36 }
递归折半查找