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Operational Systems & <strong>Java</strong><br />
Answer: You must create a C/C++ program that call directly the<br />
NotifyIcon API to display/manage the Icon in the Systray. Then<br />
call the program from <strong>Java</strong> with JNI.<br />
Currently I'm running two operating systems on one machine, Windows 2000 and<br />
Windows ME...<br />
Currently I'm running two operating systems on one machine, Windows 2000 and<br />
Windows ME.<br />
Windows ME runs on default, Windows 2000 is on D drive and ME is on C drive. I<br />
tried to add the JDK directory to the classpath but there isn't a autoexec.bat on the D<br />
directory, but there is one for C.<br />
Should I just create a autoexec.bat for D?<br />
Answer: Go to Settings/Control Panel/System/Advanced/Environment Variables...<br />
and<br />
edit your CLASSPATH variable if exists or add a new one.<br />
I need to be able to run a shell script from java, by doing a host call to unix. I am<br />
currently trying 'Runtime.exec' to do this. It says it runs it, but doesn't actually<br />
successfully complete the command (which is a file delete).<br />
I need to be able to run a shell script from java, by doing a host call to unix. I am<br />
currently trying 'Runtime.exec' to do this. It says it runs it, but doesn't actually<br />
successfully complete the command (which is a file delete).<br />
A few questions I have about this:<br />
1. Can I trace it or something to see why it isn't working?<br />
2. How can I get the 'return code' from the shell script?<br />
3. Will the java procedure wait for the shell script to execute, or does<br />
it run a seperate thread concurrently?<br />
Answer: > 1. Can I trace it or something to see why it isn't working?<br />
Runtime.exec() returns a Process object that you can get information from.<br />
If the script is written with sh or some derivate thereof you can do 'set -x' in the script<br />
to trace its behaviour. For other scripting languages there is likely a similar<br />
mechanism. To see the trace in your <strong>Java</strong> program, read from the error or output<br />
streams of the process (Process.getErrorStream() or Process.getOutputStream()).<br />
It's possible that the script is already printing a message to its error stream that you<br />
aren't seeing, indicating why it isn't working.<br />
Answer: > 2. How can I get the 'return code' from the shell script?<br />
Call Process.exitValue().<br />
Answer: > 3. Will the java procedure wait for the shell script to execute, or does it run<br />
a seperate thread concurrently?<br />
The program runs concurrently in a separate *process*, not a thread within the JVM.<br />
To wait for the process to finish, call Process.waitFor().<br />
Are not-initializable classes and methods like System.out.println() and<br />
Math.random() "synchronized" ?<br />
Answer: I think they are synchronized. Simple observation: did you ever see once<br />
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