docs: public void update() {
  
          m_maxMemory = Runtime.getRuntime().maxMemory() / 1048576;
          m_totalMemory = Runtime.getRuntime().totalMemory() / 1048576;
          m_usedMemory = (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1048576;
          m_freeMemory = m_maxMemory - m_usedMemory;
          m_usage = (m_usedMemory * 100) / m_maxMemory;
      }