Generate Combinations of Words separated by a delimiter

This solution generates different combinations of words separated by a delimiter.

If input is provided as Word1,Word2,Word3 and delimiter is provided as , then output will be

Word1

Word2

Word3

Word1,Word2

Word1,Word3

Word2,Word3

Word1,Word2,Word3

import java.util.StringTokenizer;

public class WordPermutation {  
  
    String input;   //input String
    StringBuffer output;  //Holds the output
    String delimiter = ","; //Delimiter (default comma (,))
    String arrayOfWords[];
    
    /*
     * Generates combinations by applying the 
     * concept of recursion
     */
    private void nextCombination(int position, int remainder) 
    {     
        output.append(arrayOfWords[position]+this.delimiter);  
        
        if (remainder == 1) {       
          System.out.println(output.substring(0,output.length()-1));           
        } else {       
          for (int i = position + 1; i + remainder - 1 <= arrayOfWords.length; i++)         
            nextCombination(i, remainder - 1);     
        }
        
        output.delete(output.indexOf(arrayOfWords[position]),output.length());
    }    
    
    public void generateCombinations(String input, String delimiter) 
    {     
          output = new StringBuffer();           
          this.input = input;  
          this.delimiter = delimiter;
          
          /*
           * Splitting the words by delimiter and storing in 
           * an array.
           */
          StringTokenizer buf = new StringTokenizer(input,delimiter);
          
          int lengthOfArray = buf.countTokens();
          arrayOfWords = new String[lengthOfArray];
          
          int i = 0;
          
          while(buf.hasMoreTokens())
          {
             arrayOfWords[i] = buf.nextToken();
             i++;
          }
          
          for (int j = 1; j <= lengthOfArray; j++)       
              for (int k = 0; k + j <= lengthOfArray; k++)
              {
                  nextCombination(k, j);                     
              }
    } 
    
    public void generateCombinations(String input) 
    {
        generateCombinations(input, this.delimiter);
    }
  
    /** 
     * @param args 
     */  
    public static void main(String[] args) {  
        new WordPermutation().generateCombinations("SR$WB","$");
  
    }  
}