https://docs.oracle.com/javase/tutorial/java/data/numberformat.html
    https://www.baeldung.com/java-number-formatting
    http://c.biancheng.net/view/4700.html#:~:text=Java%20String%20%E7%B1%BB%E7%9A%84format%20%28%29%E6%96%B9%E6%B3%95%E4%BD%BF%E7%94%A8%E6%8C%87%E5%AE%9A%E7%9A%84%E6%A0%BC%E5%BC%8F%E5%AD%97%E7%AC%A6%E4%B8%B2%E5%92%8C%E5%8F%82%E6%95%B0%E8%BF%94%E5%9B%9E%E4%B8%80%E4%B8%AA%E6%A0%BC%E5%BC%8F%E5%8C%96%E5%AD%97%E7%AC%A6%E4%B8%B2%E3%80%82%20%E8%AF%AD%E6%B3%951,format%20%28String%20format%2CObject%E2%80%A6%E2%80%A6args%29%20%E5%8F%82%E6%95%B0%E8%AF%B4%E6%98%8E%EF%BC%9A%20format%EF%BC%9A%E6%A0%BC%E5%BC%8F%E5%AD%97%E7%AC%A6%E4%B8%B2%E3%80%82