import com.google.common.collect.HashMultiset;import com.google.common.collect.Multiset;

import java.util.Arrays;

public class Demo { public static void main(String[] args) {

String[] words = {"A", "B", "C", "B"};

// JDK 1.8 Map counts = new HashMap(); for (String word : words) { Integer count = counts.get(word); if (count == null) { counts.put(word, 1); } else { counts.put(word, count + 1); } }

System.out.println(counts); // {A=1, B=2, C=1}

// guava Multiset multiset = HashMultiset.create(); multiset.addAll(Arrays.asList(words));

System.out.println(multiset); // [A, B x 2, C] System.out.println(multiset.count("B")); // 2 }}