why cant i run a java program from another java program? : I am running the following code. I ask the user to enter a java program. The user's program will compile correctly, and if there is any error it will be pointed out. But when I try to run the program it wont run at all. Instead I get a "Program finished with exit code 0". How do i solve this problem?

import java.io.*;
import java.util.*;

public class myprog1 {



    public static void main(String [] args) throws IOException, InterruptedException {
        System.out.println("enter the candidate name");
        Scanner scan = new Scanner(System.in);
        String cname = scan.next();
        String cfilename = "candidate.java";
        String file1 = "/home/prakasha/IdeaProjects/" + cname;
        String file2 = "/home/prakasha/IdeaProjects/";
        File file = new File("/home/prakasha/IdeaProjects/" + cname);
        file.mkdir();
        if (!file.exists()) {
            System.out.println("filenotfound");
        } else {
            System.out.println("the code is stored in his dir :" + cname);
            File fobj = new File(file, "/" + cfilename);
            FileWriter fw = new FileWriter(fobj);
            System.out.println("enter the code");
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));


            String code = br.readLine();
            fw.append(code);
            System.out.println(fobj);
            fw.close();

            ProcessBuilder pb = new ProcessBuilder
                    ("javac", file1 + "/" + cfilename);
            pb.inheritIO();

            Process process = pb.start();
            process.waitFor();



            BufferedReader is =
                    new BufferedReader(new InputStreamReader(process.getInputStream()));
            String line;
                // reading the output
            while ((line = is.readLine()) != null)
                System.out.println(line);




            ProcessBuilder pb1 = new ProcessBuilder
                    ("java", file1 + "/" + "candidate");
            System.out.println(file1 + "/" + "candidate");
            pb.inheritIO();
            Process process1 = pb1.start();
            BufferedReader reading =
                    new BufferedReader(new InputStreamReader(process1.getInputStream()));
            String line1;
            while ((line1 = reading.readLine()) != null)
                    System.out.println(line1);
            }
    }
}









  