Wordcount.java

package com.sai;

import java.util.HashMap;
import java.util.Set;

public class Wordcount {

	public static void main(String[] args) {
		duplicatewordcount dw = new duplicatewordcount();
		dw.duplicatecount("This is is a good thing in the is");

	}

}

class duplicatewordcount {

	public void duplicatecount(String string) {

		String[] words = string.split(" ");
		HashMap<String, Integer> hashmap = new HashMap<String, Integer>();
		for (String word : words) {
			if (hashmap.containsKey(word.toLowerCase())) {
				hashmap.put(word.toLowerCase(), hashmap.get(word.toLowerCase()) + 1);
			} else {
				hashmap.put(word.toLowerCase(), 1);
			}
		}

		Set<String> sets = hashmap.keySet();

		for (String set : sets) {
			if (hashmap.get(set) > 1) {
				System.out.println(set + ":" + hashmap.get(set));
			}
		}

	}

}