Java Ice Breakers

How to find the duplicate words in a sentence using HashMap

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by

anagendrakumar2020
in ,

This is the second solution to identify the duplicate words in a given input sentence of strings, using the HashMap methods.

import java.util.HashMap;
import java.util.Map.Entry;
import java.util.Scanner;
import java.util.StringTokenizer;

public class DuplicatewordsUsingHashmap {
	
	public static void main(String args[]) {
		
		HashMap<String, Integer> wordsCnt = new HashMap<String, Integer>();
		Scanner inpStr = new Scanner(System.in);
		System.out.println("Enter an input sentence");
		String sentence = inpStr.nextLine();
		StringTokenizer words = new StringTokenizer(sentence);
		
		//Storing the each word of given sentence into the HashMap
		while (words.hasMoreTokens()) {
			String nextWord=words.nextToken();
			if(!wordsCnt.containsKey(nextWord))
				wordsCnt.put(nextWord, 1);
			else
				wordsCnt.put(nextWord, wordsCnt.get(nextWord)+1);
		}
		System.out.println("The words HashMap below from the given input sentence");
		System.out.println(wordsCnt);
		
		//Traversing the wordsCnt HashMap to check the occurrences of any word entry more than one time
		for(Entry<String, Integer> mapEntries: wordsCnt.entrySet()) {
			if (mapEntries.getValue() > 1)
				System.out.println("The word="+mapEntries.getKey()+" is repeated "+mapEntries.getValue()+" times");
		}
		inpStr.close();
	}
}
Try it >>
Enter an input sentence
 This example shows that This example, This example repeated
 The words HashMap below from the given input sentence
 {that=1, shows=1, This=3, repeated=1, example=2, example,=1}
 The word=This is repeated 3 times
 The word=example is repeated 2 times

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