My Jar file supports both being clicked, and launched from the command line.
I will only display the GUI if there is a graphics environment available by checking GraphicsEnvironment.isHeadless()
I would like to be able to print logs to a file on disk if the user double clicks the jar file, and print them to the console if launched from the command line.
I have been unable to find an answer to this, are there any cross-platform environment variables, or anything else I can look at to know whether the user launched my program using java -jar app.jar, or whether they double clicked the .jar file?
One way to do this is to determine when the console is null:
public static void main(String[] args) {
Console console = System.console();
if(console!=null){
System.out.println("Console is not null");
}else{
System.out.println("Console is null");
}
}
Try to run the code from the command line using the following command:
java -jar [your_runnable_file.jar]