java - Last repeating character in a string -

i searching solution find last repeating character in string says "how doing today", supposed give y answer. have tried using linked hash map ordered insertions, getting d last repeated one.

string teststring  =  "how doing today";      char[] teststringarray = teststring.tochararray();     map<character,integer> map = new linkedhashmap<>();      for( char : teststringarray) {      if (!(i==' ')) {     if(map.containskey(i) ) {         map.put(i, map.get(i)+1);     } else {         map.put(i, 1);     }      }     }      system.out.println(map);      list<entry<character, integer>> list = new arraylist<>(map.entryset());     listiterator<entry<character, integer>> = list.listiterator(list.size());          while(it.hasprevious()) {         if(it.previous().getvalue() > 1)             system.out.println(it.previous().getkey());       } } 

help appreciated.

this code scans last character , checks if it's present in remaining substring before first character:

string str = "how doing today"; int len = str.length(); int = len - 1; (; >= 1; i--) {     if (str.substring(0, i).contains(str.charat(i) + "")) {         break;     } } if (i == 0) {     system.out.println("no repeating character"); } else     system.out.println(str.charat(i));