// Example 41 from page 31 of Java Precisely second edition (The MIT Press 2005)
// Author: Peter Sestoft (sestoft@itu.dk)

import java.util.Iterator;

class Example41 {
  public static void main(String[] args) {
    if (args.length != 1) 
      System.out.println("Usage: java Example41 <string>\n");
    else {
      Iterator<String> seq = suffixes(args[0]);
      while (seq.hasNext())
        System.out.println(seq.next());
    }
  }

  // Create and return an iterator over all non-empty suffixes of s
  static Iterator<String> suffixes(final String s) {
    return 
      new Iterator<String>() {
          int startindex=0;
          public boolean hasNext() { return startindex < s.length(); }
          public String next() { return s.substring(startindex++); }
          public void remove() { throw new UnsupportedOperationException(); }
        };
  }
}