java⽤户名部分星号替换，如何⽤星号替换Java字符串中的所有
字符
I want to replace all the characters in a Java String with * character. So it shouldn't matter what character it is, it should be replaced with a *.
I know there are heaps of examples there on internet but have not one that replaces every character and I have tried myself but no success.
解决⽅案
Java 11 and later
str = "*".repeat(str.length());
java replace方法
Note: This replaces newlines \n with *. If you want to preserve \n, see solution below.
Java 10 and earlier
str = placeAll(".", "*");
This preserves newlines.
To replace newlines with * as well in Java 10 and earlier, you can use:
str = placeAll("(?s).", "*");
The (?s) doesn't match anything but activates DOTALL mode which makes . also match \n.

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