How to sort Hashmap by its value or key - sort any map

Mostly asked coding question in product based company. concepts of maps and there implementation are being asked in many product based companies.

What you will learn in this tutorials ?

1. How to sort map ?

2. How to sort Hash map ?

3. How to Sort map using its key ?

4. How to sort map using its value ?

5. Sort map using its key in ascending or descending order / alphabatically or alphabatically reverse order.

These are the check your map concepts

How to sort hashmap by it's key or value ? 

what is hashmap?

Hashmap is a data Structure to store value in for key and values

Map<String, Integer> hmap = new HashMap<String,Integer>

Steps to sort hashmap

Solution in java:-

github link:- DataStructureAndAlgorithms/HashMapMain.java at master · pushpendragupta1993/DataStructureAndAlgorithms (github.com)

Java code to sort hashmap by its value

package com.training;
	import java.util.ArrayList;
	import java.util.Collections;
	import java.util.Comparator;
	import java.util.HashMap;
	import java.util.LinkedHashMap;
	import java.util.List;
	import java.util.Map.Entry;
	import java.util.Set;
	public class HashMapMain {
	public static void main(String args[]) {
	HashMap<String, String> countryCapitalMap = new HashMap<String, String>();
	countryCapitalMap.put("Australia", "Canberra");
	countryCapitalMap.put("France", "Paris");
	countryCapitalMap.put("Russia", "Moscow");
	countryCapitalMap.put("India", "Delhi");
	Set<Entry<String, String>> countryCapitalEntrySet = countryCapitalMap.entrySet();
	List<Entry<String, String>> entryList = new ArrayList<Entry<String, String>>(countryCapitalEntrySet);
	Collections.sort(entryList, new Comparator<Entry<String, String>>() {
	@Override
	public int compare(Entry<String, String> o1, Entry<String, String> o2) {
	// sort using value ascending or alphabetically order                                 return o1.getValue().compareTo(o2.getValue());                                 // sort using value descending or alphabetically revers order                                 return o2.getValue().compareTo(o1.getValue());                                 // sort using key ascending or alphabetically order                                 return o1.getKey().compareTo(o2.getKey());                                 // sort using key descending or alphabetically revers order                                 return o1.getKey().compareTo(o2.getKey());
	}
	});
	// Using LinkedHashMap to keep entries in sorted order
	LinkedHashMap<String, String> sortedHashMap = new LinkedHashMap<String, String>();
	for (Entry<String, String> entry : entryList) {
	sortedHashMap.put(entry.getKey(), entry.getValue());
	}
	for (String countryKey : sortedHashMap.keySet()) {
	System.out.println(countryKey + " -> " + sortedHashMap.get(countryKey));
	}
	}
	} Video with explanation of the code