Java - Styling an application

Question

Okay, i am officially scared to ask this question. I am a PHP developer that is attempting to learn the language of JAVA. My experience limits me to PHP, JavaScript and basic CSS to develop and style my web apps.

I would like to know, and this is embarrassing, What technology is used to "Style" JAVA Applications just like CSS is used to "Style" HTML & PHP applications?

I feel so stupid asking this! Please don't think i am an idiot, i am really good with PHP.

I tried to google the answer but gained more questions than answers.

Answer 1

Web Application using Java:

Frontend is  same i.e. HTML/Javascript/CSS
Backend Java (from where data you will get, connect with DB etc etc) similar to role of PHP

Desktop Application:

you can use Java Swing for UI and other API for respective work.

Mobile Application:

use J2ME API for developing application
UI here is developed using JAVA API(only api that are allowed to use under KVM (kilobyte virtual machine)).
For better look and feel there are frameworks for it.