You can do a lot with the program to enhance its functionality and learn more about working with concurrent collection techniques.
您可以改进该程序，增强其功能，并学习更多使用并发集合技术的知识。
2
Starting from the root collection and working down through the folder hierarchy, the plug-in discovers the content as the user clicks through the tree.
从根集开始，按文件夹层次往下，插件随着用户单击树形来发现内容。
3
Even as objects get added to the collection, the original Iterator can proceed, working through the items in the original collection.