Develop Reference

Can you run a Java jar file without going through the command line?

Made a game in Java and it is played using the console and the only way to run it is through the command line. Is there a way to run it without having to go through the process of going through the command line?

Batch Files (Win), Launch4J (Win), Shell Script (Unix/Linux/OS X)

You could just create a command line script depending on your OS which will start the game. Then you can create a shortcut and add an icon, so It will look like a common app.

How to keep the cmd open?

When we click on .jar files which do not contain any GUI the CMD Prompt runs the code and exits it immediately.
How to make it remain open when running a .jar by double clicking on it?
Is there any java code for it? Just like the pause command in batch files or any? I prefer only by java code but not an OS way? and also not by running command java - jar *.jar in cmd prompt.

I'd usually just open a command line first, as suggested in the other answer.
If you need a pure Java code solution though, just read from system in at the end of your code. The window will stay open while waiting for input.

Run the jar file from the command prompt
java -jar yourjarfilename.jar

Something along the lines read a character from std-in along with a print statement telling people to "press any key" should do the trick, provided you have access to the java code that is.
if not well, best option is to drop to CMD and run the command manually.

How to run program in background

I use Windows 8.1, I start program instance by command line. There is this line
java -jar "C:\Program Files (x86)\Jenkins\jenkins.war" --ajp13Port=-1 --httpPort=8082
Program starts and everything is all right. But i want to hide console from task menu. Is it possible to run program by command line in this way?

You could use
1) javaw - java without console window to start your application
or
2) start /b *command* - to start a background task

Why not using javaw instead of java?

creating a bat file which sends to background and closes (1 file)

im trying to do something simple, i want to start Burp Suite with extra java memory, but i don't want the CMD window to stay open.
If i don't use a .bat file and simple open cmd and type start /b "" java -jar -Xmx2g burpsuite_pro_v1.6.07.jar, Burp opens, the the process is sent to background, but the CMD window stays open. i can, however, close it manually and Burp will keep working.
when i try to put the thing into a CMD window, it will not even be sent to background, Burp stays dependent on the CMD, and i cant even add exit to the file.
i tried to solve the issue by following:
run bat file in background - this worked, but required me to have THREE files, i prefer a more elegant "1 file solution"

Just add the below line in your bat file and the java procees will run in background with no window open!
start javaw {Path of Your jar or Java file}

The following batch file commands should accomplish your purpose:
start "" /B java.exe -Xmx2g -jar burpsuite_pro_v1.6.07.jar
exit
You can probably even leave out the /B switch.
References
How can I run a program from a batch file without leaving the console open after the program start?
How to use the start command in a batch file?

Turns out the solution was simple: using javaw.
the issue was with using java.exe, some attempts even closed the CMD but opened a java.exe window (blank)
modding the file to contain:
start javaw -Xmx2g -jar burpsuite_pro_v1.6.07.jar solved it for me.

closing a command line window in Java

I have created a small Java application in which there is some code that executes a batch file. The execution of the batch file leads to the command line window to be opened and to display some output messages. I would like to know if there is some way in Java to call this command line window to be closed from within the program...Thanks!

the command window should close automatically when the batch file completes.
and to run a batch file in background/invisibly, check other questions

Start java by using javaw or javaw.exe.
java (java.exe) runs with an associated console window,
javaw (javaw.exe) is the same but without the console window.
see the documentation for the java command.
On Windows also use start to invoke another shell
start javaw ClassName
I'm not sure for Linux&Co. Try using an & after the command to run it in the background
javaw ClassName &
The other way, closing the window from a batch started by Java:
I don't believe that is possible directly from within Java. You can only close the batch file by itself.
Is hard to help without knowing what that batch file is doing. You may try using the start command on windows or the & in Linux to run the process in the background (start has an option to open the window minimized [/MIN] or in the background [/B]).
Or try some hack like using AutoHotKey or some system functionality (some WinAPI-DLL or equivalent in other systems).

As an addition to NimChimpsky's answer:
If you run a batch file in Windows, Windows will automatically open a command window for the batch file, in case the batch file wants to print output or prompt for input. This also applies if you launch the bat file from a Java process.
Unfortunately, Windows itself apparently provides no way to launch a batch file without such a window. To avoid the window, you will have to run the batch file via some helper program. There are several available; google for "run bat no window" to find some.
If you just want the window to go away after the batch file terminates: That should happen automatically. If it does not, some program launched by the batch file is still running.

start /b [bat file name]