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.

NodeList nList = dom.getElementsByTagName("year"); do {     Element ele = (Element) nList.item(i);     list.add(ele.getElementsByTagName("MonthId").item(0).getTextContent());     i++; } while (i < nList.getLength());  NodeList nList = dom.getElementsByTagName("year");  for (int i = 0; i < nList.getLength(); i++) {     Element ele = (Element) nList.item(i);     list.add(ele.getElementsByTagName("MonthId").item(0).getTextContent()); } 

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<Node> asList(NodeList n) {     return n.getLength()==0?       Collections.<Node>emptyList(): new NodeListWrapper(n);   }   static final class NodeListWrapper extends AbstractList<Node>   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"))) {   … }