Can I iterate through a NodeList using for-each in Java?

Question

I want to iterate through a NodeList using a for-each loop in Java. I have it working with a for loop and a do-while loop but not for-each.

Node         


        

Answer 1

The workaround for this problem is straight-forward, and, thankfully you have to implements it only once.

import java.util.*;
import org.w3c.dom.*;

public final class XmlUtil {
  private XmlUtil(){}

  public static List asList(NodeList n) {
    return n.getLength()==0?
      Collections.emptyList(): new NodeListWrapper(n);
  }
  static final class NodeListWrapper extends AbstractList
  implements RandomAccess {
    private final NodeList list;
    NodeListWrapper(NodeList l) {
      list=l;
    }
    public Node get(int index) {
      return list.item(index);
    }
    public int size() {
      return list.getLength();
    }
  }
}

Once you have added this utility class to your project and added a static import for the XmlUtil.asList method to your source code you can use it like this:

for(Node n: asList(dom.getElementsByTagName("year"))) {
  …
}