Over a million developers have joined DZone.

Sorting a HashMap By Values Without Losing Duplicates

· Java Zone

Learn more about how the Java language, tools and frameworks have been the foundation of countless enterprise systems, brought to you in partnership with Salesforce.

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());

        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)) {
                    sortedMap.put((String) key, (String) val);
        return sortedMap;

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

Discover how the Force.com Web Services Connector (WSC) is a code-generation tool and runtime library for use with Force.com Web services, brought to you in partnership with Salesforce.


{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}