java program to find the duplicate words in a string

There are following way to find the duplicate words in a string.

  • First we break the String from split() method and return string array.
  • Now create HashMap object to count word and there number of times word.
  • Create for loop to iterate String array into String.
  • Now check word as key store in HashMap from containsKey() method
  • Here word take as key and from get() method to pass word find value.
  • Create Set class to find total key from keySet() method.
  • Inside if condition check string value is greater than one or not.
  • Now print the result.
					import java.util.HashMap;
import java.util.Set;

public class CountDuplicateWord {
	public static void main(String[] args) {
		String h = "java spring java";
		String[] words = h.split(" ");
		HashMap<String, Integer> wordcount = new HashMap<String, Integer>();
		for (String word : words) {
			if (wordcount.containsKey(word)) {
				wordcount.put(word, wordcount.get(word) + 1);
			} else {
				wordcount.put(word, 1);

		Set<String> k = wordcount.keySet();
		for (String str : k) {
			if (wordcount.get(str) > 1) {
				System.out.println("word name :- "+str+ " ,number of times word is :-"+wordcount.get(str));
		System.out.println("Total word and times of count :- " + wordcount);

Output :-
word name :- java ,number of times word is :-2
Total word and times of count :- {spring=1, java=2}