How to remove accents and other graphic signals from a String in Java?

I usually use regex along with the Normalizer class. So:

public static String removerAcentos(String str) {
    return Normalizer.normalize(str, Normalizer.Form.NFD).replaceAll("[^\p{ASCII}]", "");
}

If it's Java7 + you can use this solution found in SOen link

First import this:

import java.text.Normalizer;
import java.util.regex.Pattern;

Then add this to your main class or to another class you use:

public static String deAccent(String str) {
    String nfdNormalizedString = Normalizer.normalize(str, Normalizer.Form.NFD); 
    Pattern pattern = Pattern.compile("\p{InCombiningDiacriticalMarks}+");
    return pattern.matcher(nfdNormalizedString).replaceAll("");
}

And at the time of use would look something like:

System.out.print(deAccent("Olá, mundo!"));

It uses the regular expression ( regex ) for change them: \p{InCombiningDiacriticalMarks}+

See working at IDEONE: link