import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.StringTokenizer;
 
public class WordTokenizer implements Enumeration {
	
	private StringTokenizer tokenizer;
	int wordLength;
	private Iterator iterator;
	int tokens;
		
	public WordTokenizer(String str,int newWordLength){
		tokenizer = new StringTokenizer(str," ",false);
		wordLength = newWordLength;
		iterator = init();
	}
 
	public boolean hasMoreElements() {
		return iterator.hasNext();
	}
 
	public Object nextElement() {
		return iterator.next();
	}
 
	private Iterator init(){
		ArrayList list = new ArrayList();
		while(tokenizer.hasMoreTokens()){
			String token = tokenizer.nextToken();
			if( token.length()>=wordLength )
				list.add( token );
		}
		tokens = list.size();
		return list.iterator();
	}
 
	public boolean hasMoreWords() {
		return iterator.hasNext();
	}
 
	public String nextWord() {
		return (String)iterator.next();
	}
	
	public int countTokens(){
		return tokens;
	}
	
	public static void main(String[] args){
		WordTokenizer t = new WordTokenizer("Write a class that works as a filter for StringTokenizer",5);
		while( t.hasMoreWords() ){
			System.out.print( t.nextWord() + " " );			
		}
	}
}