import java.util.stream.*;
import java.util.*;

// 1. 从集合创建
List<String> list = Arrays.asList("a", "b", "c");
Stream<String> stream1 = list.stream();
Stream<String> parallelStream = list.parallelStream();

// 2. 从数组创建
Stream<String> stream2 = Arrays.stream(new String[]{"a", "b", "c"});

// 3. 使用 Stream.of
Stream<String> stream3 = Stream.of("a", "b", "c");

// 4. 无限流
Stream<Integer> infiniteStream = Stream.iterate(0, n -> n + 2).limit(10);
Stream<Double> randomStream = Stream.generate(Math::random).limit(5);

// 5. 从文件创建（IO流）
Stream<String> lines = Files.lines(Paths.get("file.txt"));

// 6. 空流
Stream<String> emptyStream = Stream.empty();