In Selenium with Java, how to uncheck some checkboxes?

How can I write in Selenium with java the code to uncheck one of these checkboxes? In the original search are displayed checked but I want to uncheck one or two or all three to see less results, this is the displayed search:

Filter results by provider: [x]Facebook (25911), [x]Hotmail (7651), [x]Yahoo (11)

Thank you for your help :)