<dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>30.1-jre</version> </dependency> List<String> immutableList = ImmutableList.of("apple", "banana", "orange"); Set<Integer> immutableSet = ImmutableSet.of(1, 2, 3); Map<String, Integer> immutableMap = ImmutableMap.of("apple", 1, "banana", 2, "orange", 3);