Need help system call

Question

hi guys i need help i want to know how to call a prog to run and excute with java a command like shell in VB and System in c

Answer 1

Use Runtime. You have to make sure you read the output or the program will hang...
Runtime rt = Runtime.getRuntime();
Process rtProcess = rt.exec(cmd);
String result = readSTDOUT(rtProcess);
String readSTDOUT(Process p) throws Exception {
    InputStream in = p.getInputStream();
    byte [] output = new byte [1024];
    int len;
    StringBuffer buf = new StringBuffer();
    while((len = in.read(output)) >= 0) {
      buf.append(new String(output, 0, len));
    in.close();
    // check stderr if stdout was empty.
    if (buf.length() == 0 ) {
      in = p.getErrorStream();
      while((len = in.read(output)) >= 0) {
        buf.append(new String(output, 0, len));
      in.close();
    return buf.toString();
  }