Java with the internet

I didn't know if there was a way to create a java application that went to an internet site and typed into a textfield my username and password, and logged in. Is there any way to do that???
Thanks.

On the web, forms are submitted either with the GET method or with the POST method.
It is certainly possible if the site use the GET method to send the data.
The GET method pusts the data directly in the URL. That means that you can directly make a link with the appropriate fields and values filled.
However, all people with half a brain use the POST method in this
case.
It's more difficult with the POST method. But all you have to do is to send a POST request to the site (using a socket perhaps ?) with the appropriate headers.
Learn how POST request are structured in the HTTP specification.
It's even possible that existing software tools allow you to do that.

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