Does the JRE come with command to run?

**gotenks05** · 10-24-2008, 05:32 PM

Hi, I know that I have not posted here for awhile, but I have a question something dealing with the JRE. I have created a program that only runs through the terminal/Command Prompt and while I know that is possible to turn it into a GUI application, I feel that there is no need to do so. I was wondering, does the JRE come with the "java" command or is it only the JDK? I have so far created a shellscript that runs on a Mac and a linux machine, but those had the ability to make Java programs. I was thinking of making an executable script for the Windows platform, that will execute the jar file for them.

**georgemc** · 10-24-2008, 05:35 PM

Yes, the JRE comes with a java executable

**Norm** · 10-24-2008, 08:12 PM

The JRE installation on Windows should set the command to be executed when a jar file is "opened": java -jar <jarfile>.
The jar file should have a manifest file with the Main_Class: entry.

**gotenks05** · 10-24-2008, 10:27 PM

Originally Posted by Norm

The JRE installation on Windows should set the command to be executed when a jar file is "opened": java -jar <jarfile>.
The jar file should have a manifest file with the Main_Class: entry.

That only works if it is a Swing application, but I have not made a GUI version, so the user would need to manually type the command in or have a script (like a shell script for Mac/Linux or a Batch file for Windows).

**georgemc** · 10-24-2008, 11:33 PM

Originally Posted by gotenks05

That only works if it is a Swing application, but I have not made a GUI version, so the user would need to manually type the command in or have a script (like a shell script for Mac/Linux or a Batch file for Windows).

What makes you think it only works for Swing apps? Not so. Granted, you'll have trouble shutting the thing down again, but it does work. A script is preferable, as you said

**gotenks05** · 10-25-2008, 12:00 AM

Originally Posted by georgemc

What makes you think it only works for Swing apps? Not so. Granted, you'll have trouble shutting the thing down again, but it does work. A script is preferable, as you said

He was talking about double clicking the jar file. I doubt command prompt will come up, but I could try it. It is just easier to have a script file that the user can double click on the icon. At least, it won't work like that on a Mac.