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This is the only info I get:

ExecDemo.java:20: cannot find symbol
symbol : method exec(java.lang.String,java.lang.String)
location: class java.lang.Runtime
p = r.exec("top" , "-n1");...

exec("top", "-n1"); errors at compile time

I expect the same output as when exdecuting free-m or top -n1 from the command prompt/terminal

--- Update ---

I look for a call similar to C++ system(), most efficient.

I called waitFor() for the 2nd instance of the process, but nothing appeared at the output.
Similar;y, I wrote:

again, with no result whatsoever.

This is my screen output:

Hello.
I get a run-time error executing my code. Can anyone tell me why?

Thanks in advance

Here is my class with main():

class ExecDemo{
// Date d = new Date();