SPOJ problem---IITKWPCA ..is there any case left?

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

class IITKP{ public static void main(String ar[])throws Exception{ DataInputStream s=new DataInputStream(System.in);

    int t=0,len=0,x=0,count=0,i=0;
    t=Integer.parseInt(s.readLine());
    String arr[]=new String[10000];
    String st="",str="";

    while(t>0){

        x=0;

        count=0;
        str=s.readLine();


        str=str+" ";
        len=str.length();
        if (str.trim().length()==0){
            System.out.println(0);
            t--;
            continue;
        }


        for(i=0;i<len;i++){
            if(str.charAt(i)!=' ')
                st=st+str.charAt(i);

            else{
                arr[x++]=st;
                while(i<len&&str.charAt(i)==' ')
                    i++;

                i--;
                st="";
            }
        }
        Arrays.sort(arr,0,x);

    /*  for(i=0;i<x;i++)
            System.out.println(arr[i]);*/

        for(i=0;i<x;i++){

                count+=1;

            //System.out.println(arr[i]);
            while(i<(x-1)&&(arr[i].compareTo(arr[i+1]))==0){
                i++;
                //System.out.println(arr[i]);
            }

        }

        System.out.println(count);
        t--;
    }

}

}