Java二分查找代码

class HalfSearch {
	
	public static void main(String[] args) {
		int[] arr = {1, 2, 3, 4, 5, 6, 7, 8};
		int index = halfSearch(arr, 8);
		System.out.println(index);
		 
	}
	public static int halfSearch(int[] arr, int target) {
		int max = arr.length - 1;
		int min = 0;
		int mid = (max + min) / 2;
		while(max >= min) {
			if(target > arr[mid]) {
				min = mid + 1;
			} else if(target < arr[mid]) {
				max = mid - 1;
			} else {
				return mid;
			}
			mid = (max + min) / 2;
		}
		return -1;
	}
}