在Java8里创建Stream的几种方法，java8stream,创建Stream的方法共

在Java8里创建Stream的几种方法，java8stream,创建Stream的方法共

创建Stream的方法共有5种，分别为如下```javaimport java.math.BigInteger;import java.util.ArrayList;import java.util.Arrays;import java.util.List;import java.util.regex.Pattern;import java.util.stream.Stream;

/ * @author Kangjun Ways of Creating a Stream in Java 8 /public class StreamDemo {

public static void main(String[] args) {    arraysStream();    collectionStream();    generate();    iterateStream();    populaStream();}//From Arrayspublic static void arraysStream() {    String[] arr = {"program", "creek", "program", "creek", "java", "web",        "program"};    Stream<String> stream = Stream.of(arr);    System.out.println(Arrays.toString(arr));}//From Collectionspublic static void collectionStream() {    List<String> list = new ArrayList<>();    list.add("Java");    list.add("python");    list.add("c++");    list.add("c");    list.add("lisp");    Stream<String> stream = list.stream().filter(p -> p.length() > 3);    String[] arr = stream.toArray(String[]::new);    System.out.println(Arrays.toString(arr));}//Use Stream.generate()public static void generate() {    Stream<String> stream = Stream.generate(() -> "test").limit(10);    String[] strArr = stream.toArray(String[]::new);    System.out.println(Arrays.toString(strArr));}//Use Stream.iterate()public static void iterateStream() {    Stream<BigInteger> bigIntStream = Stream.iterate(BigInteger.ZERO, n -> n.add(BigInteger.TEN)).limit(10);    BigInteger[] bigIntArr = bigIntStream.toArray(BigInteger[]::new);    System.out.println(Arrays.toString(bigIntArr));}// From Popular APIspublic static void populaStream() {    String sentence = "Program creek is a Java site.";    Stream<String> wordStream = Pattern.compile("\\W").splitAsStream(sentence);    String[] wordArr = wordStream.toArray(String[]::new);    System.out.println(Arrays.toString(wordArr));}

}```