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docx4j is a library which helps you to work with the Office Open XML file format as used in docx documents, pptx presentations, and xlsx spreadsheets.
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package org.docx4j.model.styles;

import java.util.ArrayList;
import java.util.List;

	    
/**
 * Represents a node of the Tree class. The Node is also a container, and
 * can be thought of as instrumentation to determine the location of the type T
 * in the Tree.
 */
public class Node {
 
    /**
     * Nodes have names
     */
    protected String name;
    
    protected Tree tree;
	
    public T data;
    public List> children;
    
    private Node parent;
	public Node getParent() {
		return parent;
	}
	public void setParent(Node parent) {
		this.parent = parent;
	}
    		 
    /**
     * Convenience ctor to create a Node with an instance of T.
     * @param data an instance of T.
     */
    public Node(Tree tree, String name, T data) {
        //this();
    	this.name = name;
        setData(data);
        this.tree = tree;
    }
     
    /**
     * Return the children of Node. The Tree is represented by a single
     * root Node whose children are represented by a List>. Each of
     * these Node elements in the List can have children. The getChildren()
     * method will return the children of a Node.
     * @return the children of Node
     */
    public List> getChildren() {
        if (this.children == null) {
            return new ArrayList>();
        }
        return this.children;
    }
//		 
//		    /**
//		     * Sets the children of a Node object. See docs for getChildren() for
//		     * more information.
//		     * @param children the List> to set.
//		     */
//		    public void setChildren(List> children) {
//		        this.children = children;
//		    }
//		 
//		    /**
//		     * Returns the number of immediate children of this Node.
//		     * @return the number of immediate children.
//		     */
//		    public int getNumberOfChildren() {
//		        if (children == null) {
//		            return 0;
//		        }
//		        return children.size();
//		    }
     
    /**
     * Adds a child to the list of children for this Node. The addition of
     * the first child will create a new List>.
     * @param child a Node object to set.
     */
    public void addChild(Node child) {
    	
        if (children == null) {
            children = new ArrayList>();
        }
        if (!children.contains(child)) {
        	children.add(child);
        	tree.nodes.put(child.name, child);
        	child.setParent(this);
        }
    }
     
//		    /**
//		     * Inserts a Node at the specified position in the child list. Will     * throw an ArrayIndexOutOfBoundsException if the index does not exist.
//		     * @param index the position to insert at.
//		     * @param child the Node object to insert.
//		     * @throws IndexOutOfBoundsException if thrown.
//		     */
//		    public void insertChildAt(int index, Node child) throws IndexOutOfBoundsException {
//		        if (index == getNumberOfChildren()) {
//		            // this is really an append
//		            addChild(child);
//		            return;
//		        } else {
//		            children.get(index); //just to throw the exception, and stop here
//		            children.add(index, child);
//		        }
//		    }
//		     
//		    /**
//		     * Remove the Node element at index index of the List>.
//		     * @param index the index of the element to delete.
//		     * @throws IndexOutOfBoundsException if thrown.
//		     */
//		    public void removeChildAt(int index) throws IndexOutOfBoundsException {
//		        children.remove(index);
//		    }
 
    public T getData() {
        return this.data;
    }
 
    public void setData(T data) {
        this.data = data;
    }
     
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("{").append(getData().toString()).append(",[");
        int i = 0;
        for (Node e : getChildren()) {
            if (i > 0) {
                sb.append(",");
            }
            sb.append(e.getData().toString());
            i++;
        }
        sb.append("]").append("}");
        return sb.toString();
    }

}