Extract Words From a Sentence - Different Method

/**
 * Program to extract words from a sentence using a different method.
 */
import java.util.*;
public class GetWords
{
    static ArrayList<String> getWords(String sent) //Method to get the words of a sentence.
    {
        //Variables in this function.
        ArrayList<String> list = new ArrayList<String>();
        String a = " "+sent+" "; //Adding a space before and after a sentence.
        String substr = "";
        String word = "";
        int i;
        char x;
        //Starting the loop.
        for(i=0;i<a.length();i++)
        {
            x = a.charAt(i);
            if(x == ' ')
            {
                substr = a.substring(i+1); //Creating a substring from the first letter after the space.
                word = substr.substring(0,(substr.indexOf(" ") + 1)); //Word = substring from the first letter to the first space of substr.
                list.add(word);
            }
        }

        return list;
    }

    static void display(ArrayList<String> list) //Method to display the ArrayList of words.
    {
        int i;
        for(i=0;i<list.size()-2;i++)
        {
            System.out.println((i+1) + ")" + list.get(i));
        }
        System.out.println((i+1) + ")" + list.get(list.size()-2));
    }

    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        System.out.println("Please enter a sentence.");
        String a = sc.nextLine();
        ArrayList<String> list = new ArrayList<String>();
        list = getWords(a);
        System.out.println("Words:");
        display(list);
        sc.close();
    }
}