How would I print values from a HashMap while not printing duplicates?

Question

I\'m trying to fix this piece of code where I\'m printing from a hashmap having a list of plate numbers and owners (that format). I\'m trying to print out just the owners

Answer 1

To remove the duplicates, use a HashSet<String>:

public void printOwners() {
    for (String s : new HashSet<>(owners.values())) {
        System.out.println(s);            
    }
}

Alternatively with Java 8 Stream and the distinct() method:

public void printOwners() {
    owners.values().stream().distinct().forEach(System.out::println);
}