Find Duplicate String and Letters from a Given string - Java(Collections)

package Test;import java.util.HashMap;import java.util.Map;import java.util.Scanner;import java.util.Set;public class Program1 {    public static void findDuplicateWords(String str) {        // 1. Split the String - String Array formation        String[] s = str.split(" ");        // 2. Crate a HashMap to get key-value pair        HashMap<String, Integer> map = new HashMap<String, Integer>();        for (String temp : s) {            if (map.get(temp) != null) {                map.put(temp, map.get(temp) + 1);            } else                map.put(temp, 1);        }        // 3. To find duplicate words from keyValue set        Set<Map.Entry<String, Integer>> data = map.entrySet();        for (Map.Entry<String, Integer> dup : data) {            if (dup.getValue() > 1)                System.out.println("The word : '" + dup.getKey() + "' appeared - " + dup.getValue() + " times");        }    }    public static void findDuplicateLetters(String str) {        //1.Remove whitespaces        str = str.replace(" ", "");        //2.Convert to Lower case all letters        str=str.toLowerCase();        //3. create Hash map to get key-value pair        HashMap<Character, Integer> hmap = new HashMap<>();        for (int i = 0; i < str.length(); i++) {            char ch = str.charAt(i);            if (hmap.get(ch) != null) {                hmap.put(ch, hmap.get(ch) + 1);            } else                hmap.put(ch, 1);        }        Set<Map.Entry<Character, Integer>> data = hmap.entrySet();        for (Map.Entry<Character, Integer> dup : data) {            if (dup.getValue() > 1)                System.out.println("The word : '" + dup.getKey() + "' appeared - " + dup.getValue() + " times");        }    }    public static void main(String[] args) {        Scanner input = new Scanner(System.in);        System.out.println("Enter the Stirng");        String str = input.nextLine();        findDuplicateWords(str);        findDuplicateLetters(str);    }}