getChildNodes提供意外结果

那是因为每个子节点之间有2

TEXT_NODE

#text

以下内容包括文本节点及其相应的值。

<object flag="complete" id="objId" version="1">    <TEXT_NODE />    <variable_value variable_id="varId">ValueGoesHere</variable_value>    <reference item_ref="2"/>    <TEXT_NODE /></object>

可以通过修改代码来验证：

documentBuilderFactory dbFactory = documentBuilderFactory.newInstance();        documentBuilder dBuilder = dbFactory.newdocumentBuilder();        document dom = dBuilder.parse(new ByteArrayInputStream(S.getBytes()));        NodeList collected_objects = dom.getElementsByTagName("object");        System.out.println("Number of collected objects are "     + collected_objects.getLength());        for (int i = 0; i < collected_objects.getLength(); i++) { Node aNode = collected_objects.item(i); // get children of "objects" NodeList refNodes = aNode.getChildNodes(); System.out.println("# of chidren are " + refNodes.getLength()); // for (int x = 0; x < refNodes.getLength(); x++) {     Node n = refNodes.item(x);     System.out.println(n.getNodeType() + " = " + n.getNodeName() + "/" + n.getNodevalue()); } // print attributes of "objects" NamedNodeMap attributes = aNode.getAttributes(); for (int a = 0; a < attributes.getLength(); a++) {     Node theAttribute = attributes.item(a);     System.out.println(theAttribute.getNodeName() + "="  + theAttribute.getNodevalue()); }        }

输出：

Number of collected objects are 2# of chidren are 53 = #text/          1 = variable_value/null3 = #text/          1 = reference/null3 = #text/        flag=completeid=objIdversion=1# of chidren are 33 = #text/          1 = reference/null3 = #text/        comment=objCommentflag=completeid=objIdversion=1

其中，3 =

TEXT_NODE

ELEMENT_NODE