System Commands - Java

Question

I'm trying to make a little java program that executes a system command but I can't seem to figure it out

The question is how does one execute a system command using java?

UPDATE: I read the documentation & tried some examples & I still can't figure it out. Why can't it be simple like in C.

possible duplicate of How to call System commands from a java program — Mike Samuel
– Mike Samuel, Commented Sep 3, 2011 at 17:36
As I said in my answer, for simple cases it is indeed dirt simple. If you're trying to do something more complicated, perhaps you need to explain what that more complicated use case actually is? — Ernest Friedman-Hill
– Ernest Friedman-Hill, Commented Sep 3, 2011 at 18:35

Howard · Accepted Answer · 2011-09-03 17:36:23Z

4

You might want to have a look into the documentation for java.lang.ProcessBuilder. An example is given there.

answered Sep 3, 2011 at 17:36

Howard

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Srikanth Venkatesh · Accepted Answer · 2011-09-03 17:39:29Z

2

Process Builder example

answered Sep 3, 2011 at 17:39

Srikanth Venkatesh

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Ernest Friedman-Hill · Accepted Answer · 2011-09-03 22:41:22Z

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Ultimately, you use the family of exec() methods in the java.lang.Runtime class. There's a class named java.lang.ProcessBuilder which helps in setting up a process to run, although you're not obligated to use it. Be sure to read this classic article on handling the input and output streams, running Windows CMD.EXE builtins, and other potential pitfalls.

Running a command can be as simple as saying

Runtime.exec("notepad");

but as that article points out, there are plenty of subtleties to worry about.

edited Sep 3, 2011 at 22:41

answered Sep 3, 2011 at 17:35

Ernest Friedman-Hill

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2 Comments

Samantha Catania Over a year ago

I made a little test: Runtime.exec("ls") and when I compile it gives an error about non-static methods that cannot be referenced from static cont ext

Howard Over a year ago

@Samantha Catania Please try Runtime.getRuntime().exec(command);.

Barend · Accepted Answer · 2011-09-03 18:16:34Z

1

Apache Commons-Exec is similar to ProcessBuilder, but helps avoid a lot of common problems with the streams, process timeout, platform differences, etcetera. I recommend using that instead of ProcessBuilder.

answered Sep 3, 2011 at 18:16

Barend

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