How to print messages from a running jar file?

Question

Recently, I have been working on creating two tools using Eclipse. I print some messages to the console there ( System.out.print ). However, now I have built a .jar file for each tool that I want to run on another machine (without eclipse). Running this .jar does not provide me with the messages I am typing.

What is the best way to print messages on screen from a running .jar file? For example, how to print:

 System.out.print("Results succesfully saved!"); 

I searched a little Google, but could not find any results.

Answer 1

System.out.print("Results succesfully saved!"); will work just as well for the .jar program. However, it requires the user to run it in the terminal, so that he sees that the material is printed on a standard output.

If this is not what you need, then maybe you want to look at JOptionPane , which has several static methods for graphically displaying such messages.

This screenshot

for example, created by this fragment:

 import javax.swing.JOptionPane; class Test { public static void main(String[] args) { JOptionPane.showMessageDialog(null, "Results succesfully saved!"); } } 

Answer 2

Do you make cans from the console? If not, try it.

Answer 3

I'm not sure how this works for Linux, but for windows you have to go to the control panel, open the java settings, go to advanced. And select the Java console -> show console.

Of course, it is even better to use a log framework, for example Log4j instead of System.out.println. This way you can print both the file and the console.

Answer 4

Printing on the screen will mean the same as when executing your program “more directly”. However, you might consider using a registration framework, as it offers you more flexibility if you want to customize your output.