import java.util.Iterator;
public class Haddock implements Iterable<String>{
    private String greet 
        = "You #!@ Miserable earthworms! Numbskulls! and Carpet-sellers!";
    
    public void printWords(){
        int i = 0;
		final int N = greet.length();
		// skip leading non letters
		while (i<N && !Character.isLetter(greet.charAt(i)))
			i++;
		while (i<N){
			// print the word
			while (i<N && Character.isLetter(greet.charAt(i))){
				System.out.print(greet.charAt(i));
				i++;
			}
			System.out.println();
			// skip non letters
			while (i<N && !Character.isLetter(greet.charAt(i))){
				i++;
			}
		}
   }
   
   class GreetIterator implements Iterator<String>{
    	// Exercise 2.3
    	// inv: if nextWord.size() = 0, the iterator is empty
    	//      else nextWord is the head.
    	//      i is either N or the first unprocessed letter in greet
    	//      N is the length of greet.
    	final int N;
    	int i;
    	String nextWord;
    
    	GreetIterator(){
    		i=0;
    		N = greet.length();
    		findNext();
    	}
    	/* pre: i is first non-processed letter in greet or N
    	   post: if hasNext is true then nextWord is head.
    		 i is first non-processed letter in greet or N
    	*/
    	private void findNext(){
    		// skip non letters
    		while( i<N && !Character.isLetter(greet.charAt(i)) )
    			i++;
    		// find the word
    		int start = i;
    		while( i<N && Character.isLetter(greet.charAt(i)) )
    			i++;
    		nextWord = greet.substring(start,i);
    	}
    
    	public boolean hasNext(){
    		return nextWord.length()>0;
    	}
    
    	public String next(){
    		String ret = nextWord;
    		findNext();
    		return ret;
    	}
    
    	public void remove(){
    	    throw new UnsupportedOperationException();
    	}
   }
   
   public Iterator<String> iterator(){
       return new GreetIterator();
   }

    public static void foo(){
        Haddock captain = new Haddock();
        for(String s: captain)
            System.out.println("Haddock says: " + s);
    }
}