private String appendClasspath(String appPath,String libPath){
  String s=(appPath != null && !appPath.isEmpty()) ? appPath : "";
  if (libPath != null && !libPath.isEmpty()) {
    if (!s.isEmpty())     s+=File.pathSeparator;
    s+=libPath;
  }
  return s;
}

private String appendClasspath ( String appPath , String libPath ) { String s = ( appPath != null && ! appPath . isEmpty ( ) ) ? appPath : "" ; if ( libPath != null && ! libPath . isEmpty ( ) ) { if ( ! s . isEmpty ( ) ) s += File . pathSeparator ; s += libPath ; } return s ; }
appends two elements to build a classpath
