Program that will retrieve information from website.

Hi people. I am new to this forums and searched google and this forum about something I want to make, but to no success. Well I want to attempt to make a program that will go into a website retrieve information about a certain product and then send it to my java program and displays the information it retrieved. How would I go about learning how to do this. I took a beginning java class and passed it so what else would i need to learn to achieve this?

See the following link: How to Graph the HTML source of a website
This will allow you to grab the source, and you should parse it as needed using string manipulations and/or regular expressions to retrieve the information you need.

Thanks a lot!