Replacing german umlauts generated by latex or bibtex tool in java?

Question

I want to replace the german umlauts generated by a Citavi-Bibtex-Export-Tool. For example one reference string input is J{\"o}rgand I want Jörg as a result. After inspecting my JUnit-Test the result of my method was J{"o}rg - what went wrong?

public String replaceBibtexMutatedVowels(String str){
    CharSequence target = "{\\\"o}";
    CharSequence replacement = "ö";
    str.replace(target, replacement);
    return str;
}

UPDATE: Thanks guys - I was able to master german umlauts - unfortunately Bibtex escapes quotation marks with {\dg} - I was not able to create the corresponding java code.

    String afterDg = "";
    CharSequence targetDg = "{\\dg}";
    CharSequence replacementDg = "\"";
    afterDg = afterAe.replace(targetDg, replacementDg);
    newStringInstance = afterDg;
    return newStringInstance;

Answer 1

Basically, you are doing all right, but:

 str.replace(target, replacement);

must be replaced with

 str = str.replace(target, replacement);

because replace doesn't change the string itself, but returns a "replaced string".

P.S.: German has more special characters than "ö"; you're missing "ä", "ü" (and their corresponding capital letters), "ß" etc.

And here's my test code:

package test;

public class Test {

    public static void main(String[] args) throws Exception {
        String latexText = "J{\\\"o}rg";
        String normalText = replaceBibtexMutatedVowels(latexText);
        System.out.println(latexText);
        System.out.println(normalText);
    }

    public static String replaceBibtexMutatedVowels(String str) {
        CharSequence target = "{\\\"o}";
        CharSequence replacement = "ö";
        str = str.replace(target, replacement);
        return str;
    }

}