Same thing works on terminal but not in java Runtime while using Ubuntu 14.04 LTS

I have a Java project which I developed in windows. Now, I want to make it platform independent.

A part of the project is: it takes a c program and executes. takes input from file and gives output in file, then compares the output file with another file and gives a result.

At first I have a class which runs the .cpp file and produce executable file. As far I know, the command for this work is same in both windows and ubuntu and that is:

g++ -std=c++11 -o <name of executable file> <path of .cpp file>

Using the above command, it works good using terminal. But while implementing the same thing in code, it is giving compilation error. That means the following errors:

g++: fatal error: no input files

See the image to be more clear:

My code:

package judgecpp;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.file.Path;
import java.nio.file.Paths;
class CodeCompile implements Runnable, RunInCmd { Thread compilerThread; private final File fileCPP; public File file; public boolean errorHas; public CodeCompile(File fileCPP) { this.fileCPP = fileCPP; file = new File(String.format("compiledFile%d", CodeProcessing.getNewFileNumber())); compilerThread = new Thread(this, "compilerThread"); } @Override public Process cmdRun(String command) throws IOException { Runtime rt; Process pr; rt = Runtime.getRuntime(); pr = rt.exec(command); return pr; } @Override public void run() { try { String command = String.format("g++ -std=c++11 -o \"" + file.toString() + "\" \"" + fileCPP.toString() + "\"");
// if(VerdictGiver.os.equals("uni")) command = String.format("g++ -std=c++11 \"" + fileCPP.toString() + "\" -o \"" + file.toString() + "\"");
// command = "pwd"; System.out.println("Code Compile: "+command); System.out.println("OS: "+VerdictGiver.os); Process pr = cmdRun(command); Path currentRelativePath = Paths.get(""); String s = currentRelativePath.toAbsolutePath().toString(); System.out.println("Current relative path is: " + s); BufferedReader input = new BufferedReader(new InputStreamReader(pr.getErrorStream())); errorHas = false; System.out.println("Compile Error Stream starts -----------------------------------------"); while (input.readLine() != null) { System.out.println(input.readLine()); errorHas = true; } System.out.println("Compile Error Stream ends -------------------------------------------"); } catch (IOException ex) {
// Logger.getLogger(CodeCompile.class.getName()).log(Level.SEVERE, null, ex); } }
}

I am stacked here for a long time.

Update:

I got the solution, but don't know why it works. Instead of line:

String command = String.format("g++ -std=c++11 -o \"" + file.toString() + "\" \"" + fileCPP.toString() + "\"");

I used the following line:

String command = String.format("cmd /c \"g++ -std=c++11 -o \"" + file.toString() + "\" \"" + fileCPP.toString() + "\"\"");

That means generated string would be like:

cmd /c "g++ -std=c++11 -o "compiledFile0" "Submissions/20_masd_0_2015_09_14_01_09_58.cpp""

But in case of running the program, none of the following strings is working:

First (this one works fine in terminal):

"./compiledFile0"<"/home/mamun/Desktop/ContestSettings/icpc2015-data/artichoke/12.in">"output1.txt"

Second:

cmd /c ""./compiledFile0"<"/home/mamun/Desktop/ContestSettings/icpc2015-data/artichoke/12.in">"output1.txt""

Third:

cmd /c ""compiledFile0"<"/home/mamun/Desktop/ContestSettings/icpc2015-data/artichoke/12.in">"output1.txt""

Fourth:

"compiledFile0"<"/home/mamun/Desktop/ContestSettings/icpc2015-data/artichoke/12.in">"output1.txt"

But this time no luck, need help.

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