For standard colors (including common colors and default colors used by the operating system) Use `Display.getSystemColor(int)`, and pass in the `SWT.COLOR_*` constant for the color you want.


    Display display = Display.getCurrent();
    Color blue = display.getSystemColor(SWT.COLOR_BLUE);
    Color listBackground = display.getSystemColor(SWT.COLOR_LIST_BACKGROUND);

Note that you do not need to dispose these colors because SWT created them.


To create a color, try this:

    Device device = Display.getCurrent ();
    Color red = new Color (device, 255, 0, 0);



Remember that in SWT you must explicitly dispose any resources that you create when you are done with them.  This includes widgets, fonts, colors, images, displays, printers, and GCs.  If you do not dispose these resources, eventually your application will reach the resource limit of your operating system and the application will cease to run.

See also: [SWT: Managing Operating System Resources][1]

  [1]: http://www.eclipse.org/articles/swt-design-2/swt-design-2.html &quot;Managing Operating System Resources in SWT&quot;

Since Graduating from a very small school in 2006 with a badly shaped &amp; outdated program (I&#39;m a foreigner &amp; didn&#39;t know any better school at the time) I&#39;ve come to realize that I missed a lot of basic concepts from a mathematical &amp; software perspective that are mostly the foundations of other higher concepts.

I.e. I tried to listen/watch the open courseware from MIT on [Introduction to Algorithms][1] but quickly realized I was missing several mathematical concepts to better understand the course.

So what are the core mathematical concepts a good software engineer should know? And what are the possible books/sites you will recommend me?

  [1]: http://ocw.mit.edu/OcwWeb/Electrical-Engineering-and-Computer-Science/6-046JFall-2005/CourseHome/


What are the core mathematical concepts a good developer should know?

What is the proper way to minimize a WinForms app to the system tray? 

Note: minimize to ***system tray***; on the right side of the taskbar by the clock. I&#39;m not asking about minimizing to taskbar, which is what happens when you hit the &quot;minus&quot; button on the window.

I&#39;ve seen hackish solutions like, &quot;minimize, set ShowInTaskbar = false, then show your NotifyIcon.&quot;

Solutions like that are hackish because the app doesn&#39;t appear to minimize to the tray like other apps, the code has to detect when to set ShowInTaskbar = true, among other issues.

What&#39;s the proper way to do this?

What&#39;s the proper way to minimize to tray a C# WinForms app?

This is pretty simple, I come from a swing/awt background.

I&#39;m just wondering what the proper way to set the background color for a SWT widget is?

I&#39;ve been trying:

    widget.setBackground( );

Except I have no idea how to create the color Object in SWT?

Setting Colors in SWT

This is pretty simple, I come from a swing/awt background.
I'm just wondering what the proper way to set the background color for a SWT widget is?
I've been trying:
<pre><code class="hljs language-ini">widget.setBackground( );
</code></pre>
Except I have no idea how to create the color Object in SWT?

From the Java 6 [Pattern][1] documentation:

&gt; Special constructs (non-capturing)
&gt; 
&gt; &lt;code&gt;(?:&lt;/code&gt;&lt;i&gt;X&lt;/i&gt;&lt;code&gt;)&lt;/code&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;i&gt;X&lt;/i&gt;, as a non-capturing group
&gt;
&gt; …
&gt;
&gt; &lt;code&gt;(?&gt;&lt;/code&gt;&lt;i&gt;X&lt;/i&gt;&lt;code&gt;)&lt;/code&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;i&gt;X&lt;/i&gt;, as an independent, non-capturing group

Between `(?:X)` and `(?&gt;X)` what is the difference? What does the **independent** mean in this context?

  [1]: http://java.sun.com/javase/6/docs/api/java/util/regex/Pattern.html


What is a regex &quot;independent non-capturing group&quot;?

How do I format a number in Java?  
What are the &quot;Best Practices&quot;?

Will I need to round a number before I format it?

&gt;`32.302342342342343` =&gt; `32.30`
&gt;
&gt;`.7323` =&gt; `0.73`

etc.





How do I format a number in Java?

When java was young, people were excited about writing applets.  They were cool and popular, for a little while.  Now, I never see them anymore.  Instead we have flash, javascript, and a plethora of other web app-building technologies.

Why don&#39;t sites use java applets anymore?

I&#39;m also curious: historically, why do you think this occurred?  What could have been done differently to keep Java applets alive?

Where did all the java applets go?

How do you get a Media Type (MIME type) from a file using Java?  So far I&#39;ve tried JMimeMagic &amp; Mime-Util. The first gave me memory exceptions, the second doesn&#39;t close its streams properly.

How would you probe the file to determine its actual type (not merely based on the extension)?

How to get a file&#39;s Media Type (MIME type)?

Has anyone had good experiences with any Java libraries for Graph algorithms. I&#39;ve tried [JGraph][1] and found it ok, and there are a lot of different ones in google. Are there any that people are actually using successfully in production code or would recommend?

To clarify, I&#39;m not looking for a library that produces graphs/charts, I&#39;m looking for one that helps with Graph algorithms, eg minimum spanning tree, Kruskal&#39;s algorithm Nodes, Edges, etc. Ideally one with some good algorithms/data structures in a nice Java OO API.

  [1]: http://www.jgraph.com/jgraph.html

Good Java graph algorithm library?

I bought a third-party Java library which includes a JAR file and two DLL files. I wrote my own Java program which invoke the third-party JAR file. Now my question is **how can I package all my code into a single JAR file which include all my code and the third-party JAR and DLLs?**

I know *SWT* is such a case. The `swt.jar` includes dll files, but I don&#39;t know how to do this and how to make it work properly.

How to make a JAR file that includes DLL files?

I&#39;m a web developer at day and thinking about building my first real desktop application. The idea is to build a tool that automates a very repetitive task in a web application where no API is available.

I know I want to use Java. I used it before for web stuff, know the syntax pretty well  and want the application to be cross plattform as easy as possible. 

Where I&#39;m not so sure is if I should use SWT or Swing. As my main audience uses Windows, I want to look it as native as possible there. Linux and Mac should work, but the looks are not so important here.

So what are the arguments for and against each UI Framework, Swing or SWT?

Thanks.

PS: I develop on Windows using Eclipse. But was thinking about playing with Netbeans.



Java Desktop application: SWT vs. Swing

There is quite a lot of gui frameworks out there for java, but what is recognized as today&#39;s framework of choice?

The following is my understanding of the different frameworks, please correct me if im wrong. This is a very loosely defined set of questions, but i still think its valuable for anyone thinking of creating rich gui applications.


----------


**[AWT][1]**

Is the very foundation of swing, it performs well but is lacking in advanced components. If you intend to create rich applications, AWT is probably not the way to go. However for smaller gui applications that doesn&#39;t require rich user interfaces. This might suit perfectly as it&#39;s a tried and proven framework. 


----------


**[Swing][2]**

Based on AWT as previously stated. In its infancy it was regarded as slow and buggy and caused IBM to create SWT for Eclipse. However with Java 5 (or 6?) Swing became the framework of choice for building new applications. Swing has a lot of rich components but are still lacking in some areas. One example being that there isn&#39;t a full featured TreeTable component which can do sorting and filtering/searching.


----------


**[SWT][3]**

Created by IBM for Eclipse, they seemed to think that Swing was not suited for Eclipse at the time. By itself is pretty low-level, and it uses the platform&#39;s native widgets through JNI. It is not related to Swing and AWT at all. Their API is however somewhat clunky and not intuitive. They do have some advanced component&#39;s like a TreeTable. (but i don&#39;t think they support sorting and filtering out of the box). SWT uses some native bindings (through JNI?) and the rant on the internet is that this framework should not be used in today&#39;s projects. (why not?)


----------


**[SwingX][4]**

Based on Swing and it&#39;s mission is to create rich components for swing. Still under development. (not very active though.) Have a very nice set of components, like for example TreeTable. But the TreeTable does not support filtering and sorting as far as i know. It does however support searching with highlighting.

&gt; Note that SwingX is components (AFAIU) that are extensions or
&gt; compositions of existing Swing components


----------


**JGoodies**

A framework which i know nothing about... What is it&#39;s strengths and weaknesses? What set&#39;s Jgoodies apart from the rest?

&gt; JGoodies OTOH is about PLAFs and layouts.


----------


**[JavaFX][5]**

The latest flagship of Java/Oracle. promising to be the facto standard in developing rich desktop or web applications. 


----------


**[Apache Pivot][6]**

It renders UI using Java2D, thus minimizing the impact of (IMO, bloated) legacies of Swing and AWT. (@Augustus Thoo)

It&#39;s main focus seems to be on RIA (Rich internet applications), but it seems it can also be applied to desktop applications. And as a personal comment, Looks very interesting! I Especially like that it&#39;s an apache project.

https://cwiki.apache.org/PIVOT/frequently-asked-questions-faq.html


----------


**[Qt Jambi][7]**

A java wrapper to the native qt library which is written in c/c++. Very powerful, widely used and accepted. Has a lot of GUI components and a easy to use API.

http://qt-jambi.org/

----------

So, to try to summarize a bit of what im asking:

Say i wanted to create a desktop application today in Java which involves a lot of advanced components, what should i choose? And why?

Which one of these frameworks should be recognized as deprecated and which should be recognized as the frameworks of the distant future?

What is todays de-facto-standard framework and which tools do you utilize to create java gui applications?

----------

I might regret asking this, but ill try it anyways:

C#/.Net is said to have a very good set of easy to use components which can be flexed in every direction possible. And after investigating different java frameworks to some extent i can&#39;t seem to say the same about Java. Why is this? *Why doesn&#39;t java (which is the most widely used programming language in the world) have the same set of GUI components?* 

Is it just that java has based their gui components at a much lower level, and it is possible to write all these advanced components that im looking for, but you have to do much if not all of the work yourself?


  [1]: http://en.wikipedia.org/wiki/Java_AWT
  [2]: http://en.wikipedia.org/wiki/Java_Swing
  [3]: http://en.wikipedia.org/wiki/Standard_Widget_Toolkit
  [4]: http://en.wikipedia.org/wiki/SwingX
  [5]: http://en.wikipedia.org/wiki/JavaFX
  [6]: http://en.wikipedia.org/wiki/Apache_Pivot
  [7]: http://en.wikipedia.org/wiki/Qt_Jambi

Java GUI frameworks. What to choose? Swing, SWT, AWT, SwingX, JGoodies, JavaFX, Apache Pivot?

I&#39;ve built a GUI using Swing and the MigLayout.

I am using Eclipse 4.2.2 (64-bit) on Windows 7 Ultimate.
Every time I click back into the window to edit my code, a popup comes up, then I&#39;m prompted to restart Eclipse, and the Event log says the following:

     org.eclipse.swt.SWTError: No more handles
    	at org.eclipse.swt.SWT.error(SWT.java:4387)
    	at org.eclipse.swt.SWT.error(SWT.java:4276)
    	at org.eclipse.swt.SWT.error(SWT.java:4247)
    	at org.eclipse.swt.widgets.Widget.error(Widget.java:468)
    	at org.eclipse.swt.widgets.Control.createHandle(Control.java:704)
    	at org.eclipse.swt.widgets.Label.createHandle(Label.java:199)
    	at org.eclipse.swt.widgets.Control.createWidget(Control.java:744)
    	at org.eclipse.swt.widgets.Control.&lt;init&gt;(Control.java:112)
    	at org.eclipse.swt.widgets.Label.&lt;init&gt;(Label.java:101)
    	...

I&#39;m attaching screenshots of the error messages.
Has anyone else encountered this bug with Eclipse? Do you know of a work-around or a fix?

![1. Problem Occurred Message][1]


![2. Internal Error Message asking me to close Eclipse][2]


![3. Event Details][3]


  [1]: http://i.stack.imgur.com/JphWA.jpg
  [2]: http://i.stack.imgur.com/8BqHr.jpg
  [3]: http://i.stack.imgur.com/zUPpT.jpg

Eclipse Bug: Unhandled event loop exception No more handles

I program with Emacs on Ubuntu (Hardy Heron at the moment), and I like the default text coloration in the Emacs GUI. However, the default text coloration when Emacs is run in the terminal is different and garish.

How do I make the colors in the terminal match the colors in the GUI?

How to make Emacs terminal colors the same as Emacs GUI colors?

How can I set the background color of a specific item in a  *System.Windows.Forms.ListBox*?

I would like to be able to set multiple ones if possible.





Background color of a ListBox item (Windows Forms)

**Motivation**

I&#39;d like to find a way to take an arbitrary color and lighten it a few shades, so that I can programatically create a nice gradient from the one color to a lighter version. The gradient will be used as a background in a UI.

**Possibility 1**

Obviously I can just split out the RGB values and increase them individually by a certain amount. Is this actually what I want?


**Possibility 2**

My second thought was to convert the RGB to HSV/HSB/HSL (Hue, Saturation, Value/Brightness/Lightness), increase the brightness a bit, decrease the saturation a bit, and then convert it back to RGB. Will this have the desired effect in general?

Programmatically Lighten a Color

I am trying to animate a change in backgroundColor using jQuery on mouseover.

I have checked some example and I seem to have it right, it works with other properties like fontSize, but with backgroundColor I get and &quot;Invalid Property&quot; js error.
The element I am working with is a div.

    $(&quot;.usercontent&quot;).mouseover(function() {
        $(this).animate({ backgroundColor: &quot;olive&quot; }, &quot;slow&quot;);
    });


Any ideas?

jQuery animate backgroundColor

What site(s) do you recommend for looking at complimentary colors for site design? It would also be beneficial to enter a hex or RGB value and have the color wheel spit back complimentary colors.

Most popular:

 - [Kuler][1]

Others in alphabetical order:

 - [4096 Color Wheel][2]
 - [Allprofitallfree - color-wheel2][3]
 - [Color Wheel v1.2 Javascript color scheme generator][4]
 - [Colorblender][5]
 - [Colorotate][6]
 - [Colorsontheweb - colorwheel][7]   
 - [Colorschemedesigner][8]
 - [Colorschemer][9]
 - [Colourlovers][10]
 - [Colr][11]
 - [hslpicker][12]
 - [Visibone - colorlab][13]


  [1]: http://kuler.adobe.com/
  [2]: http://www.ficml.org/jemimap/style/color/wheel.html
  [3]: http://allprofitallfree.com/color-wheel2.html
  [4]: http://design.geckotribe.com/colorwheel/
  [5]: http://colorblender.com
  [6]: http://colorotate.org/
  [7]: http://colorsontheweb.com/colorwheel.asp
  [8]: http://colorschemedesigner.com/
  [9]: http://colorschemer.com/
  [10]: http://colourlovers.com/
  [11]: http://colr.org/
  [12]: http://hslpicker.com
  [13]: http://visibone.com/colorlab/

Content Type	Original Author	Original Content on Stackoverflow
Question	Brian Gianforcaro	View Question on Stackoverflow
Solution 1 - Java	qualidafial	View Answer on Stackoverflow
Solution 2 - Java	jodonnell	View Answer on Stackoverflow
Solution 3 - Java	qualidafial	View Answer on Stackoverflow

Setting Colors in SWT

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Solution 3 - Java

What's the proper way to minimize to tray a C# WinForms app?

What are the core mathematical concepts a good developer should know?

Attributions