java二分查找法

 1  public static int binarySearch(int[] srcArray, int des) {
 2         int low = 0;
 3         int high = srcArray.length - 1;
 4         while ((low <= high) && (low <= srcArray.length - 1) && (high <= srcArray.length - 1)) {
 5             int middle = (high + low) / 2;
 6             if (des == srcArray[middle]) {
 7                 return middle;
 8             } else if (des < srcArray[middle]) {
 9                 high = middle - 1;
10             } else {
11                 low = middle + 1;
12             }
13         }
14         return -1;
15     }
16 
17     public static int binarySearch2(int[] srcArray, int val) {
18         int low = 0;
19         int high = (srcArray.length) - 1;
20         while (low <= high) {
21             int mid = (low + high)/2;
22             if (srcArray[mid] == val) {
23                 return mid;
24             } else if (srcArray[mid] > val) {
25                 high = mid - 1;
26             } else {
27                 low = mid + 1;
28             }
29         }
30         return -1;
31     }