Java String IndexOf Parsing

In the code below I am splitting the String relativeDN at the "," character. After splitting the String I need to parse the string from the "=" character using indexof and then rebuild the string. I was able to parse the first = sign then rebuild the string but it doesn't remove the subsequent = character. I am trying to parse the string using idexof for all the "=" characters and then rebuild it using StringBuilder. 
 
public class StringTestProgram {
public static void main(String[] args) {
  String relativeDN = "cn=abc,dn=xyz,ou=abc/def";
  //Split String
  String[] stringData = relativeDN.split(",");
 
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