Passing java results to command line

Question

I was thinking of passing the result from Java run from command line into a command line variable. But after searching much for it, I only came across Runtime class which just runs the command.

Therefore, my question, is there anything I can do to get Java result into command line.

Platform of course is Windows.

This isn't entirely clear. In most situations, stdout is directed to your shell/console. Is this not what you're seeing? — Oliver Charlesworth, Jan 14 '14 at 17:46
Command line variable? Do you mean the String [] args array passed to main into other objects? — duffymo, Jan 14 '14 at 17:47
possible duplicate of [How do I set environment variables from Java?](http://stackoverflow.com/questions/318239/how-do-i-set-environment-variables-from-java) — MariuszS, Jan 14 '14 at 17:48
@duffymo, yes but instead of passing into main. Getting a value after main completes. — yoda, Jan 14 '14 at 17:49
From my personal experience, make sure you call java.exe and not javaw.exe (which is what the IDE usually calls) — barak manos, Jan 14 '14 at 17:50

score 3 · Answer 1 · edited May 23 '17 at 10:25

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There are only 2 ways any program (Java or otherwise) can send results back to the "command line":

1) exit code

2) capture the strings output by the program.

#1 can be done in Java using System.exit (or see a couple more options here).

#2 is done by the shell. In Unix, you typically use backticks or $():

OUTPUT=`java app.class`

In Windows Powershell, do something like

$result = & java app.class 2>&1 | Out-String

edited May 23 '17 at 10:25

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answered Jan 14 '14 at 17:50

theglauber

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Java has `void main`, so only `System.exit()` for #1. I think #2 is what the OP meant, though that has nothing to do with Java – Silly Freak Jan 14 '14 at 17:52
ouch! right, Java has void main. Thanks! edited. – theglauber Jan 14 '14 at 17:56

score 0 · Answer 2 · edited May 23 '17 at 12:18

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Possible duplicate of how-do-i-get-the-result-of-a-command-in-a-variable-in-windows

FOR /F "delims=" %i IN ('java Main') DO set today=%i

Also allows today variable to be set.

edited May 23 '17 at 12:18

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answered Jan 14 '14 at 17:52

peeyush

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Passing java results to command line

2 Answers2