java find the most common elements in map

/**
 * @author lautturi.com
 * Java example: find the most common elements in map/hashmap
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {
		ArrayList<String> string;
	    string = new ArrayList<>(Arrays.asList("hello","JAVA","lautturi","java","python","world","lau","java","python","world","Java"));
		
	    Map<String, Integer> wordMap = new HashMap<String, Integer>();

	    for (String st : string) {
	        String input = st.toUpperCase();
	        if (wordMap.get(input) != null) {
	            Integer count = wordMap.get(input) + 1;
	            wordMap.put(input, count);
	        } else {
	            wordMap.put(input, 1);
	        }
	    }
	    System.out.println(wordMap);
	    Object maxEntry = Collections.max(wordMap.entrySet(), Map.Entry.comparingByValue()).getKey();
	    System.out.println("maxEntry = " + maxEntry);

	}
}

output:

{JAVA=4, LAU=1, HELLO=1, LAUTTURI=1, PYTHON=2, WORLD=2}
maxEntry = JAVA