Question

My problem regards to compiling c++ file within java. I have tried execution of c#, it is fine.
This extract code for compiling c#

ProcessBuilder launcher = new ProcessBuilder("gmcs","HelloWorld.cs");`

However, my code for c++

ProcessBuilder launcher =new ProcessBuilder("g++", "HelloWorld.cpp -o HelloWorld");

returns error=2, No such file or directory
To indicate path I used
launcher.directory(new File(path))
in both of cases

Answer 1

You need to provide arguments separately:

ProcessBuilder launcher =
    new ProcessBuilder("g++", "HelloWorld.cpp", "-o", "HelloWorld");

Otherwise the whole argument string is passed as one argument to the g++ executable, and g++ tries to find a file named HelloWorld.cpp\ -o\ HelloWorld (using escaped spaces as you would on a Linux terminal).

See the documentation for details on the usage.