二分查找-Java版

    /** 
     * * 二分查找算法 * * 
     *  
     * @param srcArray 有序数组 * 
     * @param target 查找元素 * 
     * @return srcArray数组下标，没找到返回-1 
     */   
   public int binarySearch(int[] srcArray, int target){   
        int left = 0;   
        int right = srcArray.length - 1;   
        while(left <= right) {   
            int mid = (left + right)/2;   
            if(srcArray[mid] == target) {   
                return mid;   
            }
            else if(srcArray[mid] > target) {   
                right = mid - 1;   
            }
            else {   
                left = mid + 1;   
            }  
        }  
        return -1;  
   }