java replace German umlauts

Question

I have the following problem. I am trying to replace german umlauts like ä, ö, ü in java. But it simply does not work. Her

Answer 1

i had to modify the answer of user1438038:

private static String replaceUmlaute(String output) {
    String newString = output.replace("\u00fc", "ue")
            .replace("\u00f6", "oe")
            .replace("\u00e4", "ae")
            .replace("\u00df", "ss")
            .replaceAll("\u00dc(?=[a-z\u00e4\u00f6\u00fc\u00df ])", "Ue")
            .replaceAll("\u00d6(?=[a-z\u00e4\u00f6\u00fc\u00df ])", "Oe")
            .replaceAll("\u00c4(?=[a-z\u00e4\u00f6\u00fc\u00df ])", "Ae")
            .replace("\u00dc", "UE")
            .replace("\u00d6", "OE")
            .replace("\u00c4", "AE");
    return newString;
}

This should work on any target platform (i had problems on a tomcat on windows).