散分请教：怎么在JAVA程序中调用C程序？

#include <stdio.h>
    int main() {        printf("testing\n");        return 0;    }
 import java.io.*;    import java.util.ArrayList;        public class ExecDemo {        static public String[] runCommand(String cmd)            throws IOException {            ArrayList list = new ArrayList();
   
Process proc = Runtime.getRuntime().exec(cmd);            InputStream istr = proc.getInputStream();            BufferedReader br =                new BufferedReader(new InputStreamReader(istr));            String str;            while ((str = br.readLine()) != null)                list.add(str);
            try {                proc.waitFor();            }            catch (InterruptedException e) {                System.err.println("process was interrupted");            } 
            if (proc.exitValue() != 0)                System.err.println("exit value was non-zero");    
            br.close();                return (String[])list.toArray(new String[0]);        }
            public static void main(String args[]) throws IOException {            try {   
                 String outlist[] = runCommand("test");    
                for (int i = 0; i < outlist.length; i++)                    System.out.println(outlist[i]);            }            catch (IOException e) {                System.err.println(e);            }        }    }