code: public NodeConfig getChildNodeByName(String name) {
  		if (name == null) {
  			throw new NullPointerException("Node name is null");
  		}
  		if (childrenNodes != null && childrenNodes.size() > 0) {
  			for (NodeConfig childNode : childrenNodes) {
  				if (childNode.getName().equals(name)) {
  					return childNode;
  				}
  			}
  		}
  		return null;
  	}
docs: 根据子节点名称获得子节点
  
  @param name 子节点名称
  
  @return 子节点