How to run java program using another java program?

Question

I am using below code,

Runtime runTime = Runtime.getRuntime();
Process p = runTime.exec("javac C:\\testDemo\\Demo.java");
p.waitFor();

Process p2= Runtime.getRuntime().exec("java Demo.class");
p2.waitFor();

it is creating a .class file, but its unable to run this program. do i need to do any change in Runtime.getRuntime().exec("java Demo.class"); method?

Why not run the other programs main method?

Stefan
– Stefan

2015-01-28 09:33:51 +00:00
Commented Jan 28, 2015 at 9:33 — Stefan
– Stefan, Commented Jan 28, 2015 at 9:33

Nir Alfasi · Accepted Answer · 2015-01-28 09:04:05Z

1

Change:

java Demo.class

To:

java C:\\testDemo\\Demo

answered Jan 28, 2015 at 9:04

Nir Alfasi

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4 Comments

Sam Over a year ago

yeah i checked with that as well, still it's giving error like, Error: Could not find or load main class Demo.class

TheLostMind Over a year ago

@Sam - Check the edit.. Give the full path, it will work.. unless ofcourse your javac fails. You should really read the output of the process doing javac.

Nir Alfasi Over a year ago

@Sam on that case you should post the code of Demo.java

Nir Alfasi Over a year ago

You should also try to manually run java C:\\testDemo\\Demo

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