In-Memery-Url-Compression

In memory URL compression, pure Java implementation. Widely used in Webcrawler and url scan to avoid infinite loop. The theorem is refer to 
https://www.researchgate.net/publication/2902229_In-memory_URL_Compression

Getting Start: #inidtailize the tree; AVLTree tree = new AVLTree();

#insert the URL into the tree;
tree.insert("http://www.google.com");
tree.insert("http://www.yahoo.com");

#check the url is existed in the tree.
tree.existUrl("http://www.google.com");

Note : #Currently, it does not support deleting nodes from the tree. #Let me know if you are interested in this project. TEST