import java.util.Scanner;

class IsSort {
    public int isArrayInSortedOrder(int[] a, int index) {
        if (index == 1) {
            return 1;
        } else {
            return (a[index - 1] <= a[index - 2]) ? 0 : isArrayInSortedOrder(a, index - 1);升序
        }
    }
}

public class Main {

    public static void main(String[] args) {
        // write your code here
        Scanner scan = new Scanner(System.in);
        int[] a = {1, 2, 3, 4, 5};
        IsSort sort = new IsSort();
        int res = sort.isArrayInSortedOrder(a, 5);
        System.out.println(res);
    }
}
 

以上程式碼是判斷是否為升序，如果想判斷是否為降序只要修改一處即可.

return (a[index - 1] <= a[index - 2]) ? 0 : isArrayInSortedOrder(a, index - 1);