ISC PRACTICAL 2013

I have a query.
Are we allowed to use .split(""), Arrays.sort() , toCharArray() in the computer practical ?!and will this solution be accepted? QUESTION 8!



import java.io.*;
import java.util.*;

public class Cyclic_Number
{
public void main()
{
Scanner in=new Scanner(System.in);
System.out.print("ENTER NUMBER => ");
int n=in.nextInt(),i,len;
String str=Integer.toString(n);
String arr1[]=str.split("");
len=str.length();
Arrays.sort(arr1);
String compare=toString(arr1);

for(i=2;i<=len;i++)
{
String arr2[]=Integer.toString(n*i).split("");
Arrays.sort(arr2);
if(!compare.equals(toString(arr2)))
break;
}

if(i==len+1)
System.out.println(n+" IS A CYCLIC NUMBER");
else
System.out.println(n+" IS NOT A CYCLIC NUMBER");
}

public String toString (String arr[])
{
String str="";

for(int i=0;i<arr.length;i++)
str+=arr[i];

return str;
}

}