Permutations.java

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package aud.util;
 
public class Permutations implements Iterable<int[]> {
  int n_;
 
  public Permutations(int n) { n_=n; }
 
  @Override public PermutationIterator iterator() {
    return new PermutationIterator(n_);
  }
 
  public static void main(String[] args) {
 
    int n=args.length>0 ? Integer.parseInt(args[0]) : 3;
 
    for (int[] p : new Permutations(n)) {
      for (int j : p)
        System.out.print(j);
      System.out.println();
    }
  }
}