App { public static void main( String[] args ) { Node root = new NodeImpl("1", new NodeImpl("11", new NodeImpl("111", NullNode.getInstance(), NullNode.getInstance()), NullNode.getInstance()), new NodeImpl("12", NullNode.getInstance(), new NodeImpl("122", NullNode.getInstance(), NullNode.getInstance()))); root.walk(); }  static void main( String[] args );  }
@Test public void test() { String[] args = {}; App.main(args); }