List<String> list = ImmutableList.of("a", "b", "c"); Set<Integer> set = ImmutableSet.of(1, 2, 3); Map<String, Integer> map = ImmutableMap.of("a", 1, "b", 2); Multiset<String> multiset = HashMultiset.create(); multiset.add("a"); multiset.add("b"); multiset.add("a"); Multimap<String, Integer> multimap = ArrayListMultimap.create(); multimap.put("a", 1); multimap.put("a", 2); multimap.put("b", 3); BiMap<String, Integer> bimap = HashBiMap.create(); bimap.put("a", 1); bimap.put("b", 2); <dependencies> <dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>30.1-jre</version> </dependency> </dependencies> import com.google.common.collect.*;