编辑代码

import java.util.Scanner;

public class demo9 {
    public static void main(String[] args) {
        //定义数组
        int[] arr = {11,22,33,44,55,66};
        //创建Scanner对象
        Scanner sc = new Scanner(System.in);
        //提示用户输入
        System.out.println("请输入一个数字");
        int num = sc.nextInt();
        System.out.println(find(arr,num));
    }

    public static int find(int[] arr,int num) {
        for (int i = 0; i < arr.length; i++) {
            if (num == arr[i]){
                return i;
            }
        }
        return -1;
    }
}