Find the most common String in ArrayList()

Question

Is there a way to find the most common String in an ArrayList?

ArrayList list = new ArrayList<>();
list.add(\"t         


        

Answer 1

You can use Guava's Multiset:

ArrayList names = ...

// count names 
HashMultiset namesCounts = HashMultiset.create(names);
Set> namesAndCounts = namesCounts.entrySet();

// find one most common
Multiset.Entry maxNameByCount = Collections.max(namesAndCounts, Comparator.comparing(Multiset.Entry::getCount));

// pick all with the same number of occurrences
List mostCommonNames = new ArrayList<>();
for (Multiset.Entry nameAndCount : namesAndCounts) {
    if (nameAndCount.getCount() == maxNameByCount.getCount()) {
        mostCommonNames.add(nameAndCount.getElement());
    }
}