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hi forum, i am using an arraylist for storing a list of objects.i dont want the objects in the list to be ordered but the list should be duplicate free.how can i achieve this.plz help quickly.provide source code if possible.thanks in advance.

Hi I intend over the next few months to learnt Java with the purpose of building my own simple web crawler/spider. I have seen a few open source spiders but would like to build my own if possible. What I would like to ask is how would I go about …

hi forum, i hv used an iterator to parse over the contents of a LinkedHashSet collection.while iterating i hv to add new contents(URL links) to the collection.but adding of new content after the creation of an iterator throws an exception.I must use this particular collection for my program.i m in …

hi forum, yesterday i posted a question regarding removing duplicate objects in arraylist and looking at the replies it seemed to me that hashset will be a better option than arraylist.problem is that i want the contents to be itearated strictly in order of their insertion, but the books say …

hi forum, i m developing a simple web crawler in java.upon entering an URL, the crawler downloads the corresponding web page and continues this process.but i m having problem in accessing web pages which are redirected to a diferent URL.one such example is [URL=http://www.telegraphindia.com]www.telegraphindia.com[/URL] ,in which a new part gets …

hi, i m making a web crawler in java with oracle9i as back end.for this i need to store the web pages crawled by the crawler as compressed pages in the database.similarly the pages need to be uncompressed for viewing at a later time.but i hv no idea how to …