code: public File createFileSync(String prefix, String suffix) throws IOException {
  		File tmp;
  		if (tempDir == null)
  			tmp = File.createTempFile(this.prefix + prefix, suffix);
  		else
  			tmp = File.createTempFile(this.prefix + prefix, suffix, tempDir);
  		tmp.deleteOnExit();
  		return tmp;
  	}
docs: Create a temporary file.