java lambdaʾÀý_Java Lambda ³£ÓÃÓ﷨ʾÀý

users.stream().forEach(

item -> System.out.println(item.getId())

);

Optional optional = users.stream().filter(

item -> item.getId().equals("1")

).findFirst();

//ÌáÈ¡¶ÔÏóÊôÐÔΪlist

Set papiIds = queueList.stream().map(QueueEntity::getItemId).collect(Collectors.toSet());

//¹ýÂË

List collect= users.stream().filter(

item -> item.getId().equals("1")

).collect(Collectors.toList());

Set newUris = list.stream().filter(m -> {

String flags = m.get("flags");

if (!m.isEmpty() && !flags.contains("disconnected") && !flags.contains("s_down")) {

return true;

}

return false;

}).map(m -> {

String ip = m.get("ip");

String port = m.get("port");

return convert(ip, port);

}).collect(Collectors.toSet());

//·Ö×é

Map> collect = users.stream().collect(

Collectors.groupingBy(c -> c.getSex())

);

//ÅÅÐò

users.sort((User o1, User o2) -> o1.getAge().compareTo(o2.getAge()));

//list -> string

String appCodes = packageList.stream().map(item -> item.getCode()).collect(Collectors.joining(","));

//list -> map

Map userMap= users.stream().collect(

Collectors.toMap((key -> key.getId()), (value -> value))

);

Map propMap = users.stream().collect(

Collectors.toMap(User::getId, User::getName)

);

//map reduce

Optional reduce = users.stream().map(User::getAge).reduce((i, j) -> i + j);

//È¥ÖØ

String[] words = new String[]{"Hello","World"};

List a = Arrays.stream(words)

.map(word -> word.split(""))

.flatMap(Arrays::stream)

.distinct()

.collect(toList());

a.forEach(System.out::print);