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}