How do I get the difference between two Java maps?

I have two maps as follows:

Map<String,Record> sourceRecords;
Map<String,Record> targetRecords;

I want every map i. The keys of E are different

>It displays the mapping keys available in sourcerecords, but not in targetrecords. > It displays the mapping keys available in targetrecords, but not in sourcerecords

I did the following:

Set<String> sourceKeysList = new HashSet<String>(sourceRecords.keySet());
Set<String> targetKeysList = new HashSet<String>(targetRecords.keySet());

SetView<String> intersection = Sets.intersection(sourceKeysList,targetKeysList);
Iterator it = intersection.iterator();
while (it.hasNext()) {
    Object object = (Object) it.next();
    System.out.println(object.toString());
}

SetView<String> difference = Sets.symmetricDifference(sourceKeysList,targetKeysList);
ImmutableSet<String> immutableSet = difference.immutablecopy();

edit

if(sourceKeysList.removeAll(targetKeysList)){
            //distinct sourceKeys
            Iterator<String> it1 = sourceKeysList.iterator();
            while (it1.hasNext()) {
                String id = (String) it1.next();
                String resultMessage = "This ID exists in source file but not in target file";
                System.out.println(resultMessage);
                values = createMessageRow(id,resultMessage);
                result.add(values);
            }
        }
        if(targetKeysList.removeAll(sourceKeysList)){
            //distinct targetKeys
            Iterator<String> it1 = targetKeysList.iterator();
            while (it1.hasNext()) {
                String id = (String) it1.next();
                String resultMessage = "This ID exists in target file but not in source file";
                System.out.println(resultMessage);
                values = createMessageRow(id,resultMessage);
                result.add(values);
            }
        }

I can find a public key, but I can't find a different key Please help.

Solution

Sets also allow you to delete elements

If generating a help set is not a problem for you (because there are too many entries; then:

Set<String> sources = get a copy of all source entries
Set<String> targets = get a copy of all source entries

then:

sources.removeAll(targets) ... leaves only entries in sources that are only in sources,not in target

and

sources.retainAll(targets) ... leaves only entries that are in both sets

You can start working here