TowersOfHanoi.java

public final class TowersOfHanoi {

   // Move disc n and everything below it to the left or right
   public static void moves (final int n, final  boolean left) {
      if (n > 0) {
         moves (n-1, !left);
         System.out.printf ("move disc %d %s%n", n, left?"left":"right");
         moves (n-1, !left);
      }
   }

   public static void main (final String[] args) {
      final int n = Integer.parseInt (args[0]);
      moves (n, true);
   }
}