下面代码第九行是什么意思？

Question

public class ConfigManager {                      //读取配置文件的工具类，单例模式  private static ConfigManager configManager; private static Properties properties; private ConfigManager() {            //必须以private修饰 String configFile = "database.properties"; properties = new Properties();  InputStream is = ConfigManager.class.getClassLoader().getResourceAsStream(configFile); try { properties.load(is); is.close(); } catch (IOException e) { e.printStackTrace(); } }