ArrayList help indexing a string

Question

Basically for this project, I need the user to input a sentence and then i have to print out the different words with their index.
For example if the user inputs the following:
Hello Hello Hello World World World Hello
The program should output:
Hello 0, 1, 2, 6
World 3,4,5
something in that range well so i attempted this and here is my code:
import java.util.*;
public class Check
     public static void main(String[] args)
          String word = "";
           ArrayList <String> diffWord = new ArrayList<String>();
           ArrayList <Integer> spaces = new ArrayList<Integer>();
          ArrayList <String> noRepeat = new ArrayList<String>();
           ArrayList <String> everyThing = new ArrayList<String>();
           String everything = "";
           String total = "";
           String toString = "";
          Scanner scan = new Scanner (System.in);
         String sentence = "";
         // get the string
         System.out.println("Please enter a sentence without any capitals or puntuation marks");
         sentence = scan.next();
         // get the index for spaces
         for (int i = 0; i< sentence.length(); i++)
               if(sentence.charAt(i)==(' '))
                    spaces.add(i);
          // get the different words in Sentence
          for (int i = 0; i< sentence.length(); i++)
               word = sentence.substring(spaces.get(i)+1,spaces.get(i+1));
               diffWord.add(word);
          // get position of each word
          for (int i = 0; i < diffWord.size(); i++)
               for (int j = 0; j < diffWord.size(); j++)
                    if (diffWord.get(i)!= (noRepeat.get(i)))
                         noRepeat.add(diffWord.get(i));
          //  get everything in one
          for(int i = 0; i < noRepeat.size(); i++)
               for (int j = 0; j < diffWord.size(); j++)
                    if (noRepeat.get(i).equals(diffWord.get(j)))
                         everything += (i+" ");
                         total = (noRepeat.get(1)+ " "+everything);
                         everyThing.add(total);
          // print out everything
          for (int i = 0; i < everyThing.size(); i++)
               toString +=  everyThing.get(i);
          System.out.println(toString);
}it compiles fine but after the sentence is inputted i get the following error:
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
    at java.util.ArrayList.RangeCheck(ArrayList.java:546)
    at java.util.ArrayList.get(ArrayList.java:321)
    at DocumentIndex.getDiffWord(DocumentIndex.java:38)
    at IndexMaker.main(IndexMaker.java:17)
Process completed.Can someone PLEASE help me??? I'v been stuck on the same project for the past 4 hours and none of my friends seem to understand what to do...

Answer 1

U can try like this.......
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.*;
public class Check
     public static void main(String[] args)
          try{
          String word = "";          
           String everything = "";
           String total = "";
           String toString = "";
           String sentence = "";
         // get the string
         System.out.println("Please enter a sentence without any capitals or puntuation marks");
         BufferedReader in = new BufferedReader(new InputStreamReader(System.in, "UTF-8"));
         sentence=in.readLine();  
          // get the different words in Sentence
         String s[] = sentence.split(" ");     
         Hashtable ht=new Hashtable();  
               for (int i = 0; i< s.length; i++)
                    if(ht!=null)
                         if(!ht.containsKey(s))                              
                              ht.put(s[i],new Integer(i+1).toString());
                         else
                              Object ob=ht.get(s[i]);
                              String str=(String)ob;
                              str=str+" "+new Integer(i+1).toString();                              
                              ht.remove(s[i]);
                              ht.put(s[i],str);
               Enumeration e = ht.keys();               
          //iterate through Hashtable keys Enumeration
          while(e.hasMoreElements())
               String temp=e.nextElement().toString();
          System.out.print(temp+ " ");
          System.out.println(ht.get(temp));
          catch (Exception e) {
               // TODO: handle exception
               e.printStackTrace();
               System.out.println(e.toString());
hope this will help
Thanks
Nicky