Find first unique character in string

• In java we can find first non-repeated/unique character in string by using LinkedHashMap as it maintains insertion order.

Program:

• First we will find count of each character in given string and will store each character count/occurence in linkedHashMap. Based on count value we will get first unique character in given string.

import java.util.LinkedHashMap;
import java.util.Map.Entry;

public class FirstUniqueCharacter {
    public static void main(String[] args) {

    String str = "elephantL";
    str = str.toLowerCase();

    char[] carr = str.toCharArray();

    LinkedHashMap<Character, Integer> lmap = new LinkedHashMap<Character, Integer>();

    for (char c : carr) {
        if (lmap.containsKey(c)) {
            lmap.put(c, lmap.get(c) + 1);
        } else {
            lmap.put(c, 1);
        }
    }
    for (Entry<Character, Integer> entry : lmap.entrySet()) {
        if (entry.getValue() == 1) {
            System.out.print(entry.getKey());
            break;
        }
    }
  }
}

Output:
Find first unique character in string
Please comment below to feedback or ask questions.