编辑代码

class Main {
	public static int search(int[] arrays, int key) {
        int l = 0;
        int h = arrays.length - 1;

        while (l <= h) {
            int mid = (h + l) / 2;
            if (arrays[mid] > key) {
                h = mid - 1;
            } else if (arrays[mid] < key) {
                l = mid + 1;
            } else {
                return mid;
            }
        }
        return -1;
    }

    public static void main(String[] args) {
        int[] a = {1, 2, 3, 4, 5, 6, 7};
        System.out.println(search(a, 8));
    }
}