Develop Reference

JavaFX vs Java Swing

What exactly is JavaFX? We just started Java GUI and we are going to use Swing for our course. Now, I was looking up for some tutorials to assist me on YouTube and I downloaded some GUI videos only to find out that they are some JavaFX ones. So, what is this?

You can read up about it here: http://www.oracle.com/technetwork/java/javase/overview/javafx-samples-2158687.html
Start by downloading ensemble, it will get you started. I pick javaFX for my next java GUI app because I find it pretty cool. Swing is around because that's what everyone's used to and it will be popular for a while until more people check out javaFX. And yes JavaFX can replace swing.

How do I create an interface with buttons and text?

I've tried different ways of creating different interfaces and applets. One of the main things I'm trying to do is to get these gui's to display text and show multiple buttons with different text leading to different outcomes. What I'm asking is, what code is necessary to create an applet or an interface (because I fail at telling the difference between the two) and how should I approach building and structuring that.

I recommend you use netbeans because it has an editor and is the easy way to create Applet.
https://netbeans.org/kb/docs/web/applets.html

You have three main choices I can think of, others will for sure think of something else:
Create a web server and actually serve a web site with your interface. You can code the interface yourself and communicate with your java server using ajax, you can let GWT among others do that for you. COnsider also frameworks like Struts
Create an applet which will become an embedded object in a web site. This is quickly falling out of grace, and I'd strongly discourage you from doing it, if only because of the pains of java plugins in the browser
Create an application with an interface by using AWT or Swing (which come with Java) or, and this is my personal opinion, more elegantly with SWT
It's hard to tell what will best help you without knowing more of your requirements, but if you are going web, I'd suggest you check out GWT, and if you are going desktop app, look into SWT. Also, please understand these are all well tested frameworks and my preferences are just that, preferences.

To create an interface in eclipse using java you can use swing.
In eclipse:
Create a new Java Project (File -> New -> Java Project).
Right Click on src folder and click New -> Other -> WindowBuilder -> Swing Designer -> [Application Window]/[JApplet].
Add the components that you want (buttons, textfields...).

Seems to me like your trying to graduate from console programs to GUI programs. A GUI works differently from a console program. A console program you have a bunch of loops and if statements, but a GUI program work completely differently. The main difference is that GUI programs are event driven.
With that being said, you want to choose a GUI framework, like Swing. Then decide if you want your application to be web based or desktop. An applet is more for web. If you want a desktop program, then you want a JFrame which will be the top-level container of your application.
You can learn all the components that are available to you in the standard Swing API here. IMO it seems like you need to start from the beginnging, so I would start from the very being of How to Create GUIs with Swing. You will want to pay close attention to section on Writing Event Listeners
If you do want to create an Applet instead of a desktop program, you can see the Applets, where you'll learn how to develop Applets and how to deploy them. You will still need to learn some basics though from the Swing link I mentioned.
Also, before you start using drag and drop gui builder tools, I would strongly urge you to first learn to hand code. It will work best for you in the long run.
I hope this gets you started in the right direction.

The defacto world standard GUI for all platforms is becoming Html5 and css3.
So the easiest way for you to write an interface is in HTML. You don't need an applet unless you have real specific needs like having a constant connection to the server for a chat or whatever. Anyway most of the applet reasons to exist are now resolved in standard HTML. If you want to learn a new langue, try Dart (dartlang.org)
You could use dart to have the more adaptable GUI to standards in the world
I explain why in this blog post
http://1veu.blogspot.com/2013/12/why-i-think-dart-will-detrone-java.html
Naturally even if you need to write a stand alone application with native GUI, HTML5 and css3 are still widely employed along with webkit or native code transformers like PhoneGap.

Creating a simple gui in java for running a background process

Well, I had this question in mind for a long time.
Even though I have a complex requirement,i will keep it as simple as possible.
I have background process which takes two arguments which I use to execute from command line.
The first argumets can have three valid values and the secong argument can have two valid values.
I usually run that process on command line in solaris unix.and that process is completely coded in C++.
What I want now is I wish to create a simple gui in java for running the process in background.
I am complete new to the advanced concepts of java, and I am aware of some core java which I studied in my college days.
So,My question overe here how do I start creating a gui?
What all do I need to create a simple gui using java?
I am confident enough to learn gui programming in java as I am a c++ programmer.
Please give me some right directions to give some life to my thought and any some good materials available on the net would be helpful.

I would start by looking at;
Creating a GUI with Swing
Concurrency in Swing
Concurrency in Java
I'd also become familiar with ProcessBuilder (a simple example) and Basic IO
MarvinLabs also makes some great points as well

The Google search you'll want to use is "java swing tutorial". Swing is Java's GUI library.
You can also have a look at: Java GUI frameworks. What to choose? Swing, SWT, AWT, SwingX, JGoodies, JavaFX, Apache Pivot?

You really just need a JFrame and a JPanel. The JFrame is the physical window that the gui lives in, while the JPanel is the content manager. You place JComponents (e.g. JLabel, JComboBox) into the JPanel.
Java Api: http://docs.oracle.com/javase/7/docs/api/
Examples of using each component: http://docs.oracle.com/javase/tutorial/uiswing/components/index.html

IMO, you may try using JavaFX 2.1 to develop your GUI in java. It has Scene builder tool to design your application, built-in support css-like skin.
Check the concurrency in Javafx 2.1 here.

What Java GUI framework is good for a first GUI project?

The title description basically says it all. I'd like to use something that requires a relatively short learning curve since it is my first project and I'd like to spend at least some of it actually writing the code, not just learning how to do it, but also something that has good documentation in a way that some new bleeding edge framework probably wouldn't. Any ideas?

If what you want to do, is actually create a working program with a GUI, and you just want to do that I would recommend looking at the Swing GUI editor in NetBeans, as it is very easy to work with and powerful too.
There is an old demonstration floating around showing how to implement a preference panel like the one in Netscape Navigator (the predecessor to Firefox), but I cannot find it right now.
The Java tutorial trail is here: http://java.sun.com/docs/books/tutorial/uiswing/learn/index.html
EDIT: It appears the preference panel demo has been taken offline. You may want to see this demo for NetBeans 6.0 instead: http://www.javalobby.org/eps/matisse-updates/

It's not clear if you mean a desktop or Web GUI.
For a desktop GUI, just use Java's Swing framework. Creating a GUI With JFC/Swing is a starting point for that. Sure it's old but then again so is Swing. You could also try The Java Swing tutorial.
For a Web GUI, start with servlets/JSPs. Try Servlets and JavaServer Pages (JSP) 1.0: A Tutorial.

Swing + MiGLayout ^^

I know you did say you wanted a simple and easy to learn GUI toolkit. #cletus has nailed that answer :)
But if need to look for alternatives and evaluate them before you decide how to write a GUI, check out this list of alternatives to Swing and AWT.

Swing + GroupLayout
I've been posting on these a couple of times.

Java: Adding a User Interface to a program

If I have Java program and I need to alter it to an interface and include icons,
is there any easy I can do this and is there a good application that can help me to do it ?
or do I have to code it in myself?

Nop, /me thinks ur need 1337 mad Java programin' skillz!
Translation for the rest of the world: Sorry, you'll need to program in Java.
Added: Hey, what's with the downvotes? He started it! :P Besides - no matter if he wants to add or modify (the original text wasn't clear on this) the UI of a Java program, he will need to program in Java to bring his UI together with the code. There is no miracle tool that can allow you to draw an UI and it will suddenly do what you do.

Netbeans has a Swing GUI Builder. Quoting from their website. Let's hope this doesn't count has hidden advertising :)
Design Swing GUIs by dragging and
positioning GUI components from a
palette onto a canvas. The GUI builder
automatically takes care of the
correct spacing and alignment. Click
into JLabels, JButtons, ButtonGroups,
JTrees, JTextFields, ComboBoxes and
edit their properties directly in
place. You can use the GUI builder to
prototype GUIs right in front of
customers.

If you want to add a UI to your Java program there are tools to help you, such as the Swing GUI Builder inside of IntelliJ Idea. However, you're still going to have to write the appropriate code to hook into the UI.

It's just a website? Well depending on whether it uses CSS you might be able to just modify a .css file. This will only let you modify how the site looks as opposed to works.
See here for an example of how this technology works. However this depends on how css-dependent the website is and it's possible you may still run into some difficulties.

You want to use a Java framework to help you with the UI. For example, you can use JSF (Javaserver faces), which allows you to drag and drop components for a UI onto the site. Otherwise, you can use web programs such as Dreamweaver to design the UI, before coding the backend logic yourself in java.