Java创建Stream方式小结

Stream.of 可变参数

Stream stream = Stream.of("AA", "BB", "CC");
System.out.println(stream.collect(joining()));

Stream.of 数组

String[] values = new String[]{"AA", "BB", "CC"};
Stream stream = Stream.of(values);
System.out.println(stream.collect(joining()));

Arrays.stream

String[] values = new String[]{"AA", "BB", "CC"};
Stream stream = Arrays.stream(values);
System.out.println(stream.collect(joining()));

List

List list = List.of("AA", "BB", "CC");
Stream stream = list.stream();
System.out.println(stream.collect(joining()));

Set

Set set = Set.of("AA", "BB", "CC");
Stream stream = set.stream();
System.out.println(stream.collect(joining()));

Map

Map map = Map.of("1", "AA",
       "2", "BB",
        "3", "CC");
Stream stream = map.values().stream();
System.out.println(stream.collect(joining()));

Stream.iterate

Stream stream = Stream.iterate(3, item -> item + 5);
stream.forEach(System.out::println); //死循环

Pattern

String value = "AA BB CC";
Stream stream = Pattern.compile("\\W").splitAsStream(value);
System.out.println(stream.collect(joining()));

Files.lines

try { Stream stream9 = Files.lines(Paths.get(“d:/data.txt”)); System.out.println(“stream9:” + stream9.collect(joining())); } catch (IOException e) { e.printStackTrace(); } data.txt文件内容如下：

A B C 程序输出：

stream9:ABC

Stream.generate

Stream stream10 = Stream.generate(() -> “A”).limit(3); System.out.println(“stream10:” + stream10.collect(joining())); 程序输出：

stream10:AAA

好了，这是栈长整理的 10 种创建 Stream 的方式，是不是很骚？如果你还知道其他的骚操作，可以留言告诉大家，让大家记住你的头像和ID。