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Convert fom \uXXXX to %XX%XX

From servoloro <cb@ppp.it>
Newsgroups comp.lang.java.programmer
Subject Convert fom \uXXXX to %XX%XX
Date 2023-02-08 10:31 +0100
Organization A noiseless patient Spider
Message-ID <trvq66$4aaj$1@dont-email.me> (permalink)

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*Newbie question*
I have to convert a string from the format (how it's called ?)
\uXXXX
to (again:how it's called ?)
%XX%XX
i.e. from \u00dc to %C3%9C.
Apart from doing a dumb replaceAll
s=s.replaceAll("\u00dc", "%C3%9C");
I'm sure there is a smarter way.
Not knowing the names of the formats Google didn't help me :-(
Could someone give me hints/directions ?
TIA

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Convert fom \uXXXX to %XX%XX servoloro <cb@ppp.it> - 2023-02-08 10:31 +0100
  Re: Convert fom \uXXXX to %XX%XX servoloro <cb@ppp.it> - 2023-02-08 10:33 +0100
    Re: Convert fom \uXXXX to %XX%XX Arne Vajhøj <arne@vajhoej.dk> - 2023-02-08 10:23 -0500
  Re: Convert fom \uXXXX to %XX%XX "e.d.pro...@gmail.com" <e.d.programmer@gmail.com> - 2023-02-08 04:28 -0800
    Re: Convert fom \uXXXX to %XX%XX servoloro <cb@ppp.it> - 2023-02-08 14:53 +0100

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