Java运行出错exception in thread "main" java.

一个剪刀石头的问题，但是运行输入的时候有时会报如下的错误。不明白是怎么回事，望指教！第十七行是c.ran = comdata[ran.nextInt()%3];

import java.util.Scanner;
import java.util.Random;
public class text{
    public static void main (String []args){
        Person p = new Person();
        com c = new com();
        Scanner scan  = new Scanner(System.in);
        Random ran = new Random ();
        tool t = new tool();
        int i;
        int []comdata = {0,2,5};

        System.out.println("0 is stone\t2 is scissors\t5 is cloth");
        System.out.println("PLEASE INPUT");
        for(i=1;i<=3;i++){
            p.into = scan.nextInt();
            c.ran = comdata[ran.nextInt()%3];
            t.cam(p,c);
        }
}
}
class Person{
    int into;
}
class com{
    int ran;
}
class tool{
    int n ;
    public void cam(Person p , com c ){
        if (p.into == 0 && c.ran ==2)
        {
            System.out.println("===============================");
            System.out.println("\tcomputar is"+c.ran);
            System.out.println ("\tYOU WIN!");
            n++;
        }
        else if(p.into == 2 && c.ran ==5){
            System.out.println("===============================");
            System.out.println("\tcomputar is"+c.ran);
            System.out.println ("\tYOU WIN!");
            n++;
        }
        else if(p.into == 5 && c.ran ==0){
            System.out.println("===============================");
            System.out.println("\tcomputar is"+c.ran);
            System.out.println ("\tYOU WIN!");
            n++;
        }
        else if (p.into == c.ran ){
            System.out.println("===============================");
            System.out.println("\tcomputar is"+c.ran);
            System.out.println("\tYOU ARE THE SAME");
        }
        else{
            System.out.println("===============================");
            System.out.println("\tcomputar is"+c.ran);
            System.out.println("\tYOU LOSE");
            }
        }
}

ran.nextInt()%3这种写法换成ran.nextInt(2)这种写法，ran.nextInt()有可能为负数

        p.into = scan.nextInt();返回的是一个随机整数，有可能是负数，因此报数组出界的问题，

你可以这样写 p.into = scan.nextInt(100);得到 的是 0到100 的整数