编辑代码

package com;
import java.util.Scanner;
public class Index{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入需要查找的数据：");
        int num = sc.nextInt();
        int[] arr = {12,123,23,234,34,345};
        boolean a = false;
        int index = -1;
        for (int i = 0;i <arr.length;i++){
            if (arr[i] == num){
                a = true;
                index = i;
                break;
            }
        }
        if(a){
            System.out.println("该数据已找到！");
            System.out.println("该数据在数组中的第"+(index+1)+"个数据");
        }else{
            System.out.println("数组中没有该数据！");
        }
    }
}