如何用星号替换Java字符串中的所有字符 [英] How to replace all characters in a Java string with stars

问题描述

我想用 * 字符替换Java String中的所有字符。所以它应该是什么字符并不重要，应该用 * 替换。

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 *.

我知道那里互联网上有大量的例子，但没有一个替代每个角色，我已经尝试过但没有成功。

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.

推荐答案

Java 11及以后

Java 11 and later

str = "*".repeat(str.length());

注意：这将取代换行符 \ n ， * 。如果您想保留 \ n ，请参阅下面的解决方案。

Note: This replaces newlines \n with *. If you want to preserve \n, see solution below.

str = str.replaceAll(".", "*");

此保留换行符。

要在Java 10及更早版本中用 * 替换换行符，您可以使用：

To replace newlines with * as well in Java 10 and earlier, you can use:

str = str.replaceAll("(?s).", "*");

（？s）不会匹配任何东西，但激活 DOTALL 模式使。也匹配 \ n 。

The (?s) doesn't match anything but activates DOTALL mode which makes . also match \n.

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