<dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>30.1-jre</version> </dependency> import com.google.common.collect.Lists; import com.google.common.collect.Sets; List<String> list = Lists.newArrayList("apple", "banana", "orange"); Set<Integer> set = Sets.newHashSet(1, 2, 3); import com.google.common.collect.ImmutableList; import com.google.common.collect.ImmutableSet; import com.google.common.collect.Lists; List<String> list = Lists.newArrayList("apple", "banana", "orange"); List<String> immutableList = ImmutableList.copyOf(list); Set<Integer> set1 = ImmutableSet.of(1, 2, 3); Set<Integer> set2 = ImmutableSet.copyOf(set1); import com.google.common.collect.Lists; import com.google.common.collect.Sets; List<String> list = Lists.newArrayList("apple", "banana", "orange"); List<String> filteredList = Lists.newArrayList(Collections2.filter(list, s -> s.length() > 5)); Set<Integer> set = Sets.newHashSet(1, 2, 3); Set<String> transformedSet = Sets.newHashSet(Collections2.transform(set, i -> "Number " + i)); import com.google.common.collect.Lists; import com.google.common.collect.Sets; List<String> list1 = Lists.newArrayList("apple", "banana", "orange"); List<String> list2 = Lists.newArrayList("banana", "grape", "kiwi"); Set<String> union = Sets.union(Sets.newHashSet(list1), Sets.newHashSet(list2)); Set<String> intersection = Sets.intersection(Sets.newHashSet(list1), Sets.newHashSet(list2)); Set<String> difference = Sets.difference(Sets.newHashSet(list1), Sets.newHashSet(list2));