Schleifen steuern durch...

• Bedingung

  while ( x > 0 ) { if ( ... ) { x = ... } ... }
  

• Zähler

  for p in 1 .. 10 loop .. end loop;
  

• Daten

  Collection<String> c 
      = new LinkedList<String> ();
  for (String s : c) { ... }