始终重新分配。

password = password.replace("Password: ", " ");

字符串在Java中是不可变的，这意味着您无法修改它的现有实例。通过重新分配它，您将捕获字符串的新值到现有变量中。

Strings are immutable in Java, meaning you can't modify an existing instance of it. By re-assigning it, you'll be capturing the new value of the string into an existing variable.