e527. getting a node relative to another node in a dom document.txt

这里面包含了一百多个JAVA源文件

This example demonstrates the various methods for using a node to retrieve related nodes --- parent, child, etc. 
    // Get the parent
    Node parent = node.getParentNode();
    
    // Get children
    NodeList children = node.getChildNodes();
    
    // Get first child; null if no children
    Node child = node.getFirstChild();
    
    // Get last child; null if no children
    child = node.getLastChild();
    
    // Get next sibling; null if node is last child
    Node sibling = node.getNextSibling();
    
    // Get previous sibling; null if node is first child
    sibling = node.getPreviousSibling();
    
    // Get first sibling
    sibling = node.getParentNode().getFirstChild();
    
    // Get last sibling
    sibling = node.getParentNode().getLastChild();