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Java 8 how to create Stream, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

1. Stream.of variable parameter Stream stream1 = Stream.of ("A", "B", "C"); System.out.println ("stream1:" + stream1.collect (joining ()

Program output:

Stream1:ABC

2. Stream.of array String [] values = new String [] {"A", "B", "C"}; Stream stream2 = Stream.of (values); System.out.println ("stream2:" + stream2.collect (joining ()

Program output:

Stream2:ABC

Look at the Stream.of source code, the above two ways are actually the packaging version of the third way.

Public static Stream of (T... Values) {return Arrays.stream (values);}

The way we use the source code directly is the same.

3. Arrays.streamString [] values = new String [] {"A", "B", "C"}; Stream stream3 = Arrays.stream (values); System.out.println ("stream3:" + stream3.collect (joining ()

Program output:

Stream3:ABC

4. ListList list = Arrays.asList ("A", "B", "C"); Stream stream4 = list.stream (); System.out.println ("stream4:" + stream4.collect (joining ()

Program output:

Stream4:ABC

5. SetSet set = new HashSet (Arrays.asList ("A", "B", "C"); Stream stream5 = set.stream (); System.out.println ("stream5:" + stream5.collect (joining ()

Program output:

Stream5:ABC

6. MapMap map = new HashMap (); map.put ("1", "A"); map.put ("2", "B"); map.put ("3", "C"); Stream stream6 = map.values (). Stream (); System.out.println ("stream6:" + stream6.collect (joining ()

Program output:

Stream6:ABC

7. Stream.iterateStream stream7 = Stream.iterate ("A", e-> String.valueOf ((char) (e.charAt (0) + 1)) .limit (3); System.out.println ("stream7:" + stream7.collect (joining ()

Program output:

Stream7:ABC

8. PatternString value = "A B C"; Stream stream8 = Pattern.compile ("\\ W") .splitAsStream (value); System.out.println ("stream8:" + stream8.collect (joining ()

Program output:

Stream8:ABC

9. Files.linestry {Stream stream9 = Files.lines (Paths.get ("d:/data.txt")); System.out.println ("stream9:" + stream9.collect (joining ();} catch (IOException e) {e.printStackTrace ();}

The data.txt file is as follows:

ABC

Program output:

Stream9:ABC

10. Stream.generateStream stream10 = Stream.generate (()-> "A"). Limit (3); System.out.println ("stream10:" + stream10.collect (joining ()

Program output:

Stream10:AAA

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