Java8 创建Stream的几种方法

1. Stream的静态方法 of 可以将数组转换为Stream

   //Stream.of(T... values) 参数为一组数组String[] strings = { "java", "js", "angular", "react", "vue" };Stream<String> stream1 = Stream.of(strings);Stream<String> stream2= Stream.of("java", "js", "angular", "react", "vue");

2. Arrays的静态方法 stream可以将数组【的一部分】转换为stream //Arrays.stream(T[] array) array为一组数组String[] strings = { "java", "js", "angular", "react", "vue" };Stream<String> stream1 = Arrays.stream(strings);//Arrays.stream(T[] array, int startInclusive, int endExclusive);//array为一组数组，startInclusive为要截取的那部分数组的起始下标，endExclusive为要截取的那部分数组的结束下标+1Stream<String> stream2 = Arrays.stream(strings, 0, 3);//java,js,angular
3. Stream的静态方法 empty 可以创建空的stream

   //Stream.empty() 无参数Stream<String> stream = Stream.empty();System.out.println(stream.count());//0

4. Stream的的静态方法generate 可以产生一个特定的值的stream

   //Stream.generate(Supplier<T> s)  参数为Supplier函数接口，利用lambda表达式实现该接口，没有任何输入，返回T   Stream<String> stream = Stream.generate(() -> "java");stream .forEach(e -> System.out.println(e));//java