DZone
Thanks for visiting DZone today,
Edit Profile
  • Manage Email Subscriptions
  • How to Post to DZone
  • Article Submission Guidelines
Sign Out View Profile
  • Post an Article
  • Manage My Drafts
Over 2 million developers have joined DZone.
Log In / Join
Refcards Trend Reports
Events Video Library
Over 2 million developers have joined DZone. Join Today! Thanks for visiting DZone today,
Edit Profile Manage Email Subscriptions Moderation Admin Console How to Post to DZone Article Submission Guidelines
View Profile
Sign Out
Refcards
Trend Reports
Events
View Events Video Library
Zones
Culture and Methodologies Agile Career Development Methodologies Team Management
Data Engineering AI/ML Big Data Data Databases IoT
Software Design and Architecture Cloud Architecture Containers Integration Microservices Performance Security
Coding Frameworks Java JavaScript Languages Tools
Testing, Deployment, and Maintenance Deployment DevOps and CI/CD Maintenance Monitoring and Observability Testing, Tools, and Frameworks
Culture and Methodologies
Agile Career Development Methodologies Team Management
Data Engineering
AI/ML Big Data Data Databases IoT
Software Design and Architecture
Cloud Architecture Containers Integration Microservices Performance Security
Coding
Frameworks Java JavaScript Languages Tools
Testing, Deployment, and Maintenance
Deployment DevOps and CI/CD Maintenance Monitoring and Observability Testing, Tools, and Frameworks

Integrating PostgreSQL Databases with ANF: Join this workshop to learn how to create a PostgreSQL server using Instaclustr’s managed service

Mobile Database Essentials: Assess data needs, storage requirements, and more when leveraging databases for cloud and edge applications.

Monitoring and Observability for LLMs: Datadog and Google Cloud discuss how to achieve optimal AI model performance.

Automated Testing: The latest on architecture, TDD, and the benefits of AI and low-code tools.

Related

  • Top Java Collection Interview Questions for 2021
  • How To Sort Objects In Java
  • What Is Quick Sort in C Programming?
  • TypeScript: Useful Features

Trending

  • OneStream Fast Data Extracts APIs
  • Breaking Free From the Cloud With Kamal: Just Enough Orchestration for Your Apps
  • The State of Data Streaming for Digital Natives (Born in the Cloud)
  • Multi-Tenancy With Keycloak, Angular, and SpringBoot
  1. DZone
  2. Data Engineering
  3. Data
  4. Sorting a HashMap By Values Without Losing Duplicates

Sorting a HashMap By Values Without Losing Duplicates

A. Programmer user avatar by
A. Programmer
·
Jan. 05, 12 · Interview
Like (0)
Save
Tweet
Share
16.05K Views

Join the DZone community and get the full member experience.

Join For Free

The below method sorts a HashMap by values without removing duplicates. It works for <String,String> but it can be modified accordingly for other types:

private LinkedHashMap sortMapByValuesWithDuplicates(Map passedMap) {
        List mapKeys = new ArrayList(passedMap.keySet());
        List mapValues = new ArrayList(passedMap.values());
        Collections.sort(mapValues);
        Collections.sort(mapKeys);

        LinkedHashMap sortedMap = new LinkedHashMap();

        Iterator valueIt = mapValues.iterator();
        while (valueIt.hasNext()) {
            Object val = valueIt.next();
            Iterator keyIt = mapKeys.iterator();

            while (keyIt.hasNext()) {
                Object key = keyIt.next();
                String comp1 = passedMap.get(key).toString();
                String comp2 = val.toString();

                if (comp1.equals(comp2)) {
                    passedMap.remove(key);
                    mapKeys.remove(key);
                    sortedMap.put((String) key, (String) val);
                    break;
                }
            }
        }
        return sortedMap;
    }

From http://e-blog-java.blogspot.com/2011/12/sorting-hashmap-by-values-without.html

Data structure Sorting

Opinions expressed by DZone contributors are their own.

Related

  • Top Java Collection Interview Questions for 2021
  • How To Sort Objects In Java
  • What Is Quick Sort in C Programming?
  • TypeScript: Useful Features

Comments

Partner Resources

X

ABOUT US

  • About DZone
  • Send feedback
  • Careers
  • Sitemap

ADVERTISE

  • Advertise with DZone

CONTRIBUTE ON DZONE

  • Article Submission Guidelines
  • Become a Contributor
  • Visit the Writers' Zone

LEGAL

  • Terms of Service
  • Privacy Policy

CONTACT US

  • 3343 Perimeter Hill Drive
  • Suite 100
  • Nashville, TN 37211
  • support@dzone.com

Let's be friends: