doc

http://ifeve.com/google-guava-collectionutilities/

List

List<String> theseElements = Lists.newArrayList("alpha", "beta", "gamma");

Map

@Test
@SneakyThrows
public void mapTest() {
    Map<String, String> map = Maps.newHashMap();

    //salary/salary1不可变map,调用put方法会抛异常 UnsupportedOperationException
    Map<String, Integer> salary = ImmutableMap.<String, Integer>builder()
            .put("John", 1000)
            .put("Jane", 1500)
            .put("Adam", 2000)
            .put("Tom", 2000)
            .build();
    Map<String, Integer> salary1 = ImmutableMap.of("John", 1000, "Jane", 1500);

    //三列
    Table<String, String, Integer> distance = HashBasedTable.create();
    distance.put("London", "Paris", 340);
    distance.put("New York", "Los Angeles", 3940);
    distance.put("London", "New York", 5576);
    System.out.println(distance.row("London"));// {Paris=340, New York=5576}

    //一键多值
    Multimap<Integer, String> keyValues = ArrayListMultimap.create();
    keyValues.put(1, "a");
    keyValues.put(1, "b");
    keyValues.put(2, "c");
    System.out.println(keyValues.toString());// {1=[a, b], 2=[c]}
}

Set

@Test
@SneakyThrows
public void setTest() {
    HashSet<Integer> setA = Sets.newHashSet(1, 2, 3, 4, 5);
    HashSet<Integer> setB = Sets.newHashSet(4, 5, 6, 7, 8);

    Sets.SetView<Integer> union = Sets.union(setA, setB);//合集
    System.out.println(union);//[1, 2, 3, 4, 5, 8, 6, 7]

    Sets.SetView<Integer> difference = Sets.difference(setA, setB);//差集
    System.out.println(difference);//[1, 2, 3]

    Sets.SetView<Integer> intersection = Sets.intersection(setA, setB);//交集
    System.out.println(intersection);//[4, 5]
}