import{_ as e}from"./plugin-vue_export-helper.21dcd24c.js";import{r as c,o,c as l,a as n,b as t,e as p,d as s}from"./app.85cbe1c4.js";const u={},i=p(`

\u4E24\u4E2A\u661F\u671F\u4EE5\u524D\uFF0C\u5C31\u6709\u8BFB\u8005\u5F3A\u70C8\u8981\u6C42\u6211\u5199\u4E00\u7BC7 Java Stream \u6D41\u7684\u6587\u7AE0\uFF0C\u6211\u8BF4\u5E02\u9762\u4E0A\u4E0D\u662F\u5DF2\u7ECF\u6709\u5F88\u591A\u4E86\u5417\uFF0C\u7ED3\u679C\u4F60\u731C\u4ED6\u600E\u4E48\u8BF4\uFF1A\u201C\u5C31\u60F3\u770B\u4F60\u5199\u7684\u554A\uFF01\u201D\u4F60\u770B\u4F60\u770B\uFF0C\u591A\u4E48\u82CD\u767D\u7684\u559C\u6B22\u554A\u3002\u90A3\u5C31\u201C\u52C9\u4E3A\u5176\u96BE\u201D\u5199\u4E00\u7BC7\u5427\uFF0C\u563B\u563B\u3002

\u5355\u4ECE\u201CStream\u201D\u8FD9\u4E2A\u5355\u8BCD\u4E0A\u6765\u770B\uFF0C\u5B83\u4F3C\u4E4E\u548C java.io \u5305\u4E0B\u7684 InputStream \u548C OutputStream \u6709\u4E9B\u5173\u7CFB\u3002\u5B9E\u9645\u4E0A\u5462\uFF0C\u6CA1\u6BDB\u5173\u7CFB\u3002Java 8 \u65B0\u589E\u7684 Stream \u662F\u4E3A\u4E86\u89E3\u653E\u7A0B\u5E8F\u5458\u64CD\u4F5C\u96C6\u5408\uFF08Collection\uFF09\u65F6\u7684\u751F\u4EA7\u529B\uFF0C\u4E4B\u6240\u4EE5\u80FD\u89E3\u653E\uFF0C\u5F88\u5927\u4E00\u90E8\u5206\u539F\u56E0\u53EF\u4EE5\u5F52\u529F\u4E8E\u540C\u65F6\u51FA\u73B0\u7684 Lambda \u8868\u8FBE\u5F0F\u2014\u2014\u6781\u5927\u7684\u63D0\u9AD8\u4E86\u7F16\u7A0B\u6548\u7387\u548C\u7A0B\u5E8F\u53EF\u8BFB\u6027\u3002

Stream \u7A76\u7ADF\u662F\u4EC0\u4E48\u5462\uFF1F

Stream \u5C31\u597D\u50CF\u4E00\u4E2A\u9AD8\u7EA7\u7684\u8FED\u4EE3\u5668\uFF0C\u4F46\u53EA\u80FD\u904D\u5386\u4E00\u6B21\uFF0C\u5C31\u597D\u50CF\u4E00\u6C5F\u6625\u6C34\u5411\u4E1C\u6D41\uFF1B\u5728\u6D41\u7684\u8FC7\u7A0B\u4E2D\uFF0C\u5BF9\u6D41\u4E2D\u7684\u5143\u7D20\u6267\u884C\u4E00\u4E9B\u64CD\u4F5C\uFF0C\u6BD4\u5982\u201C\u8FC7\u6EE4\u6389\u957F\u5EA6\u5927\u4E8E 10 \u7684\u5B57\u7B26\u4E32\u201D\u3001\u201C\u83B7\u53D6\u6BCF\u4E2A\u5B57\u7B26\u4E32\u7684\u9996\u5B57\u6BCD\u201D\u7B49\u3002

\u8981\u60F3\u64CD\u4F5C\u6D41\uFF0C\u9996\u5148\u9700\u8981\u6709\u4E00\u4E2A\u6570\u636E\u6E90\uFF0C\u53EF\u4EE5\u662F\u6570\u7EC4\u6216\u8005\u96C6\u5408\u3002\u6BCF\u6B21\u64CD\u4F5C\u90FD\u4F1A\u8FD4\u56DE\u4E00\u4E2A\u65B0\u7684\u6D41\u5BF9\u8C61\uFF0C\u65B9\u4FBF\u8FDB\u884C\u94FE\u5F0F\u64CD\u4F5C\uFF0C\u4F46\u539F\u6709\u7684\u6D41\u5BF9\u8C61\u4F1A\u4FDD\u6301\u4E0D\u53D8\u3002

\u6D41\u7684\u64CD\u4F5C\u53EF\u4EE5\u5206\u4E3A\u4E24\u79CD\u7C7B\u578B\uFF1A

1\uFF09\u4E2D\u95F4\u64CD\u4F5C\uFF0C\u53EF\u4EE5\u6709\u591A\u4E2A\uFF0C\u6BCF\u6B21\u8FD4\u56DE\u4E00\u4E2A\u65B0\u7684\u6D41\uFF0C\u53EF\u8FDB\u884C\u94FE\u5F0F\u64CD\u4F5C\u3002

2\uFF09\u7EC8\u7AEF\u64CD\u4F5C\uFF0C\u53EA\u80FD\u6709\u4E00\u4E2A\uFF0C\u6BCF\u6B21\u6267\u884C\u5B8C\uFF0C\u8FD9\u4E2A\u6D41\u4E5F\u5C31\u7528\u5149\u5149\u4E86\uFF0C\u65E0\u6CD5\u6267\u884C\u4E0B\u4E00\u4E2A\u64CD\u4F5C\uFF0C\u56E0\u6B64\u53EA\u80FD\u653E\u5728\u6700\u540E\u3002

\u6765\u4E3E\u4E2A\u4F8B\u5B50\u3002

List<String> list = new ArrayList<>();
list.add("\u6B66\u6C49\u52A0\u6CB9");
list.add("\u4E2D\u56FD\u52A0\u6CB9");
list.add("\u4E16\u754C\u52A0\u6CB9");
list.add("\u4E16\u754C\u52A0\u6CB9");

long count = list.stream().distinct().count();
System.out.println(count);

distinct() \u65B9\u6CD5\u662F\u4E00\u4E2A\u4E2D\u95F4\u64CD\u4F5C\uFF08\u53BB\u91CD\uFF09\uFF0C\u5B83\u4F1A\u8FD4\u56DE\u4E00\u4E2A\u65B0\u7684\u6D41\uFF08\u6CA1\u6709\u5171\u540C\u5143\u7D20\uFF09\u3002

Stream<T> distinct();

count() \u65B9\u6CD5\u662F\u4E00\u4E2A\u7EC8\u7AEF\u64CD\u4F5C\uFF0C\u8FD4\u56DE\u6D41\u4E2D\u7684\u5143\u7D20\u4E2A\u6570\u3002

long count();

\u4E2D\u95F4\u64CD\u4F5C\u4E0D\u4F1A\u7ACB\u5373\u6267\u884C\uFF0C\u53EA\u6709\u7B49\u5230\u7EC8\u7AEF\u64CD\u4F5C\u7684\u65F6\u5019\uFF0C\u6D41\u624D\u5F00\u59CB\u771F\u6B63\u5730\u904D\u5386\uFF0C\u7528\u4E8E\u6620\u5C04\u3001\u8FC7\u6EE4\u7B49\u3002\u901A\u4FD7\u70B9\u8BF4\uFF0C\u5C31\u662F\u4E00\u6B21\u904D\u5386\u6267\u884C\u591A\u4E2A\u64CD\u4F5C\uFF0C\u6027\u80FD\u5C31\u5927\u5927\u63D0\u9AD8\u4E86\u3002

\u7406\u8BBA\u90E8\u5206\u5C31\u626F\u8FD9\u4E48\u591A\uFF0C\u4E0B\u9762\u76F4\u63A5\u8FDB\u5165\u5B9E\u6218\u90E8\u5206\u3002

01\u3001\u521B\u5EFA\u6D41

\u5982\u679C\u662F\u6570\u7EC4\u7684\u8BDD\uFF0C\u53EF\u4EE5\u4F7F\u7528 Arrays.stream() \u6216\u8005 Stream.of() \u521B\u5EFA\u6D41\uFF1B\u5982\u679C\u662F\u96C6\u5408\u7684\u8BDD\uFF0C\u53EF\u4EE5\u76F4\u63A5\u4F7F\u7528 stream() \u65B9\u6CD5\u521B\u5EFA\u6D41\uFF0C\u56E0\u4E3A\u8BE5\u65B9\u6CD5\u5DF2\u7ECF\u6DFB\u52A0\u5230 Collection \u63A5\u53E3\u4E2D\u3002

public class CreateStreamDemo {
    public static void main(String[] args) {
        String[] arr = new String[]{"\u6B66\u6C49\u52A0\u6CB9", "\u4E2D\u56FD\u52A0\u6CB9", "\u4E16\u754C\u52A0\u6CB9"};
        Stream<String> stream = Arrays.stream(arr);

        stream = Stream.of("\u6B66\u6C49\u52A0\u6CB9", "\u4E2D\u56FD\u52A0\u6CB9", "\u4E16\u754C\u52A0\u6CB9");

        List<String> list = new ArrayList<>();
        list.add("\u6B66\u6C49\u52A0\u6CB9");
        list.add("\u4E2D\u56FD\u52A0\u6CB9");
        list.add("\u4E16\u754C\u52A0\u6CB9");
        stream = list.stream();
    }
}

\u67E5\u770B Stream \u6E90\u7801\u7684\u8BDD\uFF0C\u4F60\u4F1A\u53D1\u73B0 of() \u65B9\u6CD5\u5185\u90E8\u5176\u5B9E\u8C03\u7528\u4E86 Arrays.stream() \u65B9\u6CD5\u3002

public static<T> Stream<T> of(T... values) {
    return Arrays.stream(values);
}

\u53E6\u5916\uFF0C\u96C6\u5408\u8FD8\u53EF\u4EE5\u8C03\u7528 parallelStream() \u65B9\u6CD5\u521B\u5EFA\u5E76\u53D1\u6D41\uFF0C\u9ED8\u8BA4\u4F7F\u7528\u7684\u662F ForkJoinPool.commonPool()\u7EBF\u7A0B\u6C60\u3002

List<Long> aList = new ArrayList<>();
Stream<Long> parallelStream = aList.parallelStream();

02\u3001\u64CD\u4F5C\u6D41

Stream \u7C7B\u63D0\u4F9B\u4E86\u5F88\u591A\u6709\u7528\u7684\u64CD\u4F5C\u6D41\u7684\u65B9\u6CD5\uFF0C\u6211\u6765\u6311\u4E00\u4E9B\u5E38\u7528\u7684\u7ED9\u4F60\u4ECB\u7ECD\u4E00\u4E0B\u3002

1\uFF09\u8FC7\u6EE4

\u901A\u8FC7 filter() \u65B9\u6CD5\u53EF\u4EE5\u4ECE\u6D41\u4E2D\u7B5B\u9009\u51FA\u6211\u4EEC\u60F3\u8981\u7684\u5143\u7D20\u3002

public class FilterStreamDemo {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("\u5468\u6770\u4F26");
        list.add("\u738B\u529B\u5B8F");
        list.add("\u9676\u5586");
        list.add("\u6797\u4FCA\u6770");
        Stream<String> stream = list.stream().filter(element -> element.contains("\u738B"));
        stream.forEach(System.out::println);
    }
}

filter() \u65B9\u6CD5\u63A5\u6536\u7684\u662F\u4E00\u4E2A Predicate\uFF08Java 8 \u65B0\u589E\u7684\u4E00\u4E2A\u51FD\u6570\u5F0F\u63A5\u53E3\uFF0C\u63A5\u53D7\u4E00\u4E2A\u8F93\u5165\u53C2\u6570\u8FD4\u56DE\u4E00\u4E2A\u5E03\u5C14\u503C\u7ED3\u679C\uFF09\u7C7B\u578B\u7684\u53C2\u6570\uFF0C\u56E0\u6B64\uFF0C\u6211\u4EEC\u53EF\u4EE5\u76F4\u63A5\u5C06\u4E00\u4E2A Lambda \u8868\u8FBE\u5F0F\u4F20\u9012\u7ED9\u8BE5\u65B9\u6CD5\uFF0C\u6BD4\u5982\u8BF4 element -> element.contains("\u738B") \u5C31\u662F\u7B5B\u9009\u51FA\u5E26\u6709\u201C\u738B\u201D\u7684\u5B57\u7B26\u4E32\u3002

forEach() \u65B9\u6CD5\u63A5\u6536\u7684\u662F\u4E00\u4E2A Consumer\uFF08Java 8 \u65B0\u589E\u7684\u4E00\u4E2A\u51FD\u6570\u5F0F\u63A5\u53E3\uFF0C\u63A5\u53D7\u4E00\u4E2A\u8F93\u5165\u53C2\u6570\u5E76\u4E14\u65E0\u8FD4\u56DE\u7684\u64CD\u4F5C\uFF09\u7C7B\u578B\u7684\u53C2\u6570\uFF0C\u7C7B\u540D :: \u65B9\u6CD5\u540D\u662F Java 8 \u5F15\u5165\u7684\u65B0\u8BED\u6CD5\uFF0CSystem.out \u8FD4\u56DE PrintStream \u7C7B\uFF0Cprintln \u65B9\u6CD5\u4F60\u5E94\u8BE5\u77E5\u9053\u662F\u6253\u5370\u7684\u3002

stream.forEach(System.out::println); \u76F8\u5F53\u4E8E\u5728 for \u5FAA\u73AF\u4E2D\u6253\u5370\uFF0C\u7C7B\u4F3C\u4E8E\u4E0B\u9762\u7684\u4EE3\u7801\uFF1A

for (String s : strs) {
    System.out.println(s);
}

\u5F88\u660E\u663E\uFF0C\u4E00\u884C\u4EE3\u7801\u770B\u8D77\u6765\u66F4\u7B80\u6D01\u4E00\u4E9B\u3002\u6765\u770B\u4E00\u4E0B\u7A0B\u5E8F\u7684\u8F93\u51FA\u7ED3\u679C\uFF1A

\u738B\u529B\u5B8F

2\uFF09\u6620\u5C04

\u5982\u679C\u60F3\u901A\u8FC7\u67D0\u79CD\u64CD\u4F5C\u628A\u4E00\u4E2A\u6D41\u4E2D\u7684\u5143\u7D20\u8F6C\u5316\u6210\u65B0\u7684\u6D41\u4E2D\u7684\u5143\u7D20\uFF0C\u53EF\u4EE5\u4F7F\u7528 map() \u65B9\u6CD5\u3002

public class MapStreamDemo {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("\u5468\u6770\u4F26");
        list.add("\u738B\u529B\u5B8F");
        list.add("\u9676\u5586");
        list.add("\u6797\u4FCA\u6770");
        Stream<Integer> stream = list.stream().map(String::length);
        stream.forEach(System.out::println);
    }
}

map() \u65B9\u6CD5\u63A5\u6536\u7684\u662F\u4E00\u4E2A Function\uFF08Java 8 \u65B0\u589E\u7684\u4E00\u4E2A\u51FD\u6570\u5F0F\u63A5\u53E3\uFF0C\u63A5\u53D7\u4E00\u4E2A\u8F93\u5165\u53C2\u6570 T\uFF0C\u8FD4\u56DE\u4E00\u4E2A\u7ED3\u679C R\uFF09\u7C7B\u578B\u7684\u53C2\u6570\uFF0C\u6B64\u65F6\u53C2\u6570 \u4E3A String \u7C7B\u7684 length \u65B9\u6CD5\uFF0C\u4E5F\u5C31\u662F\u628A Stream<String> \u7684\u6D41\u8F6C\u6210\u4E00\u4E2A Stream<Integer> \u7684\u6D41\u3002

\u7A0B\u5E8F\u8F93\u51FA\u7684\u7ED3\u679C\u5982\u4E0B\u6240\u793A\uFF1A

3
3
2
3

3\uFF09\u5339\u914D

Stream \u7C7B\u63D0\u4F9B\u4E86\u4E09\u4E2A\u65B9\u6CD5\u53EF\u4F9B\u8FDB\u884C\u5143\u7D20\u5339\u914D\uFF0C\u5B83\u4EEC\u5206\u522B\u662F\uFF1A

public class MatchStreamDemo {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("\u5468\u6770\u4F26");
        list.add("\u738B\u529B\u5B8F");
        list.add("\u9676\u5586");
        list.add("\u6797\u4FCA\u6770");

        boolean  anyMatchFlag = list.stream().anyMatch(element -> element.contains("\u738B"));
        boolean  allMatchFlag = list.stream().allMatch(element -> element.length() > 1);
        boolean  noneMatchFlag = list.stream().noneMatch(element -> element.endsWith("\u6C89"));
        System.out.println(anyMatchFlag);
        System.out.println(allMatchFlag);
        System.out.println(noneMatchFlag);
    }
}

\u56E0\u4E3A\u201C\u738B\u529B\u5B8F\u201D\u4EE5\u201C\u738B\u201D\u5B57\u5F00\u5934\uFF0C\u6240\u4EE5 anyMatchFlag \u5E94\u8BE5\u4E3A true\uFF1B\u56E0\u4E3A\u201C\u5468\u6770\u4F26\u201D\u3001\u201C\u738B\u529B\u5B8F\u201D\u3001\u201C\u9676\u5586\u201D\u3001\u201C\u6797\u4FCA\u6770\u201D\u7684\u5B57\u7B26\u4E32\u957F\u5EA6\u90FD\u5927\u4E8E 1\uFF0C\u6240\u4EE5 allMatchFlag \u4E3A true\uFF1B\u56E0\u4E3A 4 \u4E2A\u5B57\u7B26\u4E32\u7ED3\u5C3E\u90FD\u4E0D\u662F\u201C\u6C89\u201D\uFF0C\u6240\u4EE5 noneMatchFlag \u4E3A true\u3002

\u7A0B\u5E8F\u8F93\u51FA\u7684\u7ED3\u679C\u5982\u4E0B\u6240\u793A\uFF1A

true
true
true

4\uFF09\u7EC4\u5408

reduce() \u65B9\u6CD5\u7684\u4E3B\u8981\u4F5C\u7528\u662F\u628A Stream \u4E2D\u7684\u5143\u7D20\u7EC4\u5408\u8D77\u6765\uFF0C\u5B83\u6709\u4E24\u79CD\u7528\u6CD5\uFF1A

`,51),k=s("\u6CA1\u6709\u8D77\u59CB\u503C\uFF0C\u53EA\u6709\u4E00\u4E2A\u53C2\u6570\uFF0C\u5C31\u662F\u8FD0\u7B97\u89C4\u5219\uFF0C\u6B64\u65F6\u8FD4\u56DE "),r={href:"https://mp.weixin.qq.com/s/PqK0KNVHyoEtZDtp5odocA",target:"_blank",rel:"noopener noreferrer"},d=s("Optional"),m=s("\u3002"),v=p(`

\u6709\u8D77\u59CB\u503C\uFF0C\u6709\u8FD0\u7B97\u89C4\u5219\uFF0C\u4E24\u4E2A\u53C2\u6570\uFF0C\u6B64\u65F6\u8FD4\u56DE\u7684\u7C7B\u578B\u548C\u8D77\u59CB\u503C\u7C7B\u578B\u4E00\u81F4\u3002

\u6765\u770B\u4E0B\u9762\u8FD9\u4E2A\u4F8B\u5B50\u3002

public class ReduceStreamDemo {
    public static void main(String[] args) {
        Integer[] ints = {0, 1, 2, 3};
        List<Integer> list = Arrays.asList(ints);

        Optional<Integer> optional = list.stream().reduce((a, b) -> a + b);
        Optional<Integer> optional1 = list.stream().reduce(Integer::sum);
        System.out.println(optional.orElse(0));
        System.out.println(optional1.orElse(0));

        int reduce = list.stream().reduce(6, (a, b) -> a + b);
        System.out.println(reduce);
        int reduce1 = list.stream().reduce(6, Integer::sum);
        System.out.println(reduce1);
    }
}
`,4),g=s("\u8FD0\u7B97\u89C4\u5219\u53EF\u4EE5\u662F "),b={href:"https://mp.weixin.qq.com/s/ozr0jYHIc12WSTmmd_vEjw",target:"_blank",rel:"noopener noreferrer"},f=s("Lambda \u8868\u8FBE\u5F0F"),h=s("\uFF08\u6BD4\u5982 "),y=n("code",null,"(a, b) -> a + b",-1),S=s("\uFF09\uFF0C\u4E5F\u53EF\u4EE5\u662F\u7C7B\u540D::\u65B9\u6CD5\u540D\uFF08\u6BD4\u5982 "),_=n("code",null,"Integer::sum",-1),q=s("\uFF09\u3002"),j=p(`

\u7A0B\u5E8F\u8FD0\u884C\u7684\u7ED3\u679C\u5982\u4E0B\u6240\u793A\uFF1A

6
6
12
12

0\u30011\u30012\u30013 \u5728\u6CA1\u6709\u8D77\u59CB\u503C\u76F8\u52A0\u7684\u65F6\u5019\u7ED3\u679C\u4E3A 6\uFF1B\u6709\u8D77\u59CB\u503C 6 \u7684\u65F6\u5019\u7ED3\u679C\u4E3A 12\u3002

03\u3001\u8F6C\u6362\u6D41

\u65E2\u7136\u53EF\u4EE5\u628A\u96C6\u5408\u6216\u8005\u6570\u7EC4\u8F6C\u6210\u6D41\uFF0C\u90A3\u4E48\u4E5F\u5E94\u8BE5\u6709\u5BF9\u5E94\u7684\u65B9\u6CD5\uFF0C\u5C06\u6D41\u8F6C\u6362\u56DE\u53BB\u2014\u2014collect() \u65B9\u6CD5\u5C31\u6EE1\u8DB3\u4E86\u8FD9\u79CD\u9700\u6C42\u3002

public class CollectStreamDemo {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("\u5468\u6770\u4F26");
        list.add("\u738B\u529B\u5B8F");
        list.add("\u9676\u5586");
        list.add("\u6797\u4FCA\u6770");

        String[] strArray = list.stream().toArray(String[]::new);
        System.out.println(Arrays.toString(strArray));

        List<Integer> list1 = list.stream().map(String::length).collect(Collectors.toList());
        List<String> list2 = list.stream().collect(Collectors.toCollection(ArrayList::new));
        System.out.println(list1);
        System.out.println(list2);

        String str = list.stream().collect(Collectors.joining(", ")).toString();
        System.out.println(str);
    }
}

toArray() \u65B9\u6CD5\u53EF\u4EE5\u5C06\u6D41\u8F6C\u6362\u6210\u6570\u7EC4\uFF0C\u4F60\u53EF\u80FD\u6BD4\u8F83\u597D\u5947\u7684\u662F String[]::new\uFF0C\u5B83\u662F\u4EC0\u4E48\u4E1C\u4E1C\u5462\uFF1F\u6765\u770B\u4E00\u4E0B toArray() \u65B9\u6CD5\u7684\u6E90\u7801\u3002

<A> A[] toArray(IntFunction<A[]> generator);

\u4E5F\u5C31\u662F\u8BF4 String[]::new \u662F\u4E00\u4E2A IntFunction\uFF0C\u4E00\u4E2A\u53EF\u4EE5\u4EA7\u751F\u6240\u9700\u7684\u65B0\u6570\u7EC4\u7684\u51FD\u6570\uFF0C\u53EF\u4EE5\u901A\u8FC7\u53CD\u7F16\u8BD1\u5B57\u8282\u7801\u770B\u770B\u5B83\u5230\u5E95\u662F\u4EC0\u4E48\uFF1A

String[] strArray = (String[])list.stream().toArray((x$0) -> {
    return new String[x$0];
});
System.out.println(Arrays.toString(strArray));

\u4E5F\u5C31\u662F\u76F8\u5F53\u4E8E\u8FD4\u56DE\u4E86\u4E00\u4E2A\u6307\u5B9A\u957F\u5EA6\u7684\u5B57\u7B26\u4E32\u6570\u7EC4\u3002

\u5F53\u6211\u4EEC\u9700\u8981\u628A\u4E00\u4E2A\u96C6\u5408\u6309\u7167\u67D0\u79CD\u89C4\u5219\u8F6C\u6210\u53E6\u5916\u4E00\u4E2A\u96C6\u5408\u7684\u65F6\u5019\uFF0C\u5C31\u53EF\u4EE5\u914D\u5957\u4F7F\u7528 map() \u65B9\u6CD5\u548C collect() \u65B9\u6CD5\u3002

List<Integer> list1 = list.stream().map(String::length).collect(Collectors.toList());

\u901A\u8FC7 stream() \u65B9\u6CD5\u521B\u5EFA\u96C6\u5408\u7684\u6D41\u540E\uFF0C\u518D\u901A\u8FC7 map(String:length) \u5C06\u5176\u6620\u5C04\u4E3A\u5B57\u7B26\u4E32\u957F\u5EA6\u7684\u4E00\u4E2A\u65B0\u6D41\uFF0C\u6700\u540E\u901A\u8FC7 collect() \u65B9\u6CD5\u5C06\u5176\u8F6C\u6362\u6210\u65B0\u7684\u96C6\u5408\u3002

Collectors \u662F\u4E00\u4E2A\u6536\u96C6\u5668\u7684\u5DE5\u5177\u7C7B\uFF0C\u5185\u7F6E\u4E86\u4E00\u7CFB\u5217\u6536\u96C6\u5668\u5B9E\u73B0\uFF0C\u6BD4\u5982\u8BF4 toList() \u65B9\u6CD5\u5C06\u5143\u7D20\u6536\u96C6\u5230\u4E00\u4E2A\u65B0\u7684 java.util.List \u4E2D\uFF1B\u6BD4\u5982\u8BF4 toCollection() \u65B9\u6CD5\u5C06\u5143\u7D20\u6536\u96C6\u5230\u4E00\u4E2A\u65B0\u7684 java.util.ArrayList \u4E2D\uFF1B\u6BD4\u5982\u8BF4 joining() \u65B9\u6CD5\u5C06\u5143\u7D20\u6536\u96C6\u5230\u4E00\u4E2A\u53EF\u4EE5\u7528\u5206\u9694\u7B26\u6307\u5B9A\u7684\u5B57\u7B26\u4E32\u4E2D\u3002

\u6765\u770B\u4E00\u4E0B\u7A0B\u5E8F\u7684\u8F93\u51FA\u7ED3\u679C\uFF1A

[\u5468\u6770\u4F26, \u738B\u529B\u5B8F, \u9676\u5586, \u6797\u4FCA\u6770]
[3, 3, 2, 3]
[\u5468\u6770\u4F26, \u738B\u529B\u5B8F, \u9676\u5586, \u6797\u4FCA\u6770]
\u5468\u6770\u4F26, \u738B\u529B\u5B8F, \u9676\u5586, \u6797\u4FCA\u6770

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