Using character arrays to save passwords is better than saving passwords using string

In Java, it is better to save a password using a character array than to save the password using string.

Two reasons:

1. It is difficult to purge from memory.
   String is a non-mutable object that is placed in a string buffer to facilitate reuse, so it may be retained in memory for a long time.
   Any person with access to the memory can easily see the plaintext password
   Of course, the plaintext password should not be used at all.
2. Java provides the GetPassword () method of the JPasswordField component
   This is specially prepared for the password, don't you? Don't be lazy.
3. At a time you don't know, it could be leaked somewhere else.
   such as the log. May 2018 Twitter Hundreds of millions of user plaintext password disclosure (see here: 330 million user password suspect, Twitter a major security vulnerability), is an example

Using character arrays to save passwords is better than saving passwords using string