[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"site-config":3,"primary-menu":6,"cat-java8":85,"catposts-java8":97,"post-detail-post-java8-consumer-f342cdbd":502},{"config":4,"socialLinks":5},null,[],{"metadata":7,"spec":10,"menuItems":20},{"name":8,"creationTimestamp":9},"primary","2026-09-12T06:13:55.024154Z",{"displayName":11,"menuItems":12},"主菜单",[13,14,15,16,17,18,19],"88c3f10b-321c-4092-86a8-70db00251b74","menu-item-izrtmxer","c4c814d1-0c2c-456b-8c96-4864965fee94","menu-item-column","menu-item-tools","menu-item-zsxq","menu-item-ocrxlczu",[21,30,40,49,58,67,76],{"displayName":22,"metadata":23,"spec":25,"status":28,"children":29},"首页",{"name":13,"creationTimestamp":24},"2026-09-12T06:13:54.422830Z",{"displayName":22,"href":26,"priority":27,"menuName":8},"\u002F",0,{"displayName":22,"href":26},[],{"displayName":31,"metadata":32,"spec":34,"status":38,"children":39},"Java面试八股",{"name":14,"creationTimestamp":33},"2026-09-13T09:42:02.854891Z",{"displayName":31,"href":35,"target":36,"priority":37,"menuName":8},"\u002Fjava-interview","_self",1,{"displayName":31,"href":35},[],{"displayName":41,"metadata":42,"spec":44,"status":47,"children":48},"文章",{"name":15,"creationTimestamp":43},"2026-09-12T06:13:54.457307Z",{"displayName":41,"href":45,"priority":46,"menuName":8},"\u002Farchives",2,{"displayName":41,"href":45},[],{"displayName":50,"metadata":51,"spec":53,"status":56,"children":57},"项目实战",{"name":16,"creationTimestamp":52},"2026-09-14T00:35:08.138170Z",{"displayName":50,"href":54,"target":36,"priority":55,"menuName":8},"\u002Fcolumn",3,{"displayName":50,"href":54},[],{"displayName":59,"metadata":60,"spec":62,"status":65,"children":66},"在线工具",{"name":17,"creationTimestamp":61},"2026-09-14T00:35:08.171474Z",{"displayName":59,"href":63,"target":36,"priority":64,"menuName":8},"\u002Ftools",4,{"displayName":59,"href":63},[],{"displayName":68,"metadata":69,"spec":71,"status":74,"children":75},"知识星球",{"name":18,"creationTimestamp":70},"2026-09-14T00:35:08.199145Z",{"displayName":68,"href":72,"target":36,"priority":73,"menuName":8},"\u002Fzsxq",5,{"displayName":68,"href":72},[],{"displayName":77,"metadata":78,"spec":80,"status":83,"children":84},"特价云服务器",{"name":19,"creationTimestamp":79},"2026-09-25T15:30:59.201614Z",{"displayName":77,"href":81,"target":36,"priority":82,"menuName":8},"\u002Fserver",6,{"displayName":77,"href":81},[],{"metadata":86,"spec":89,"status":94,"postCount":96},{"name":87,"creationTimestamp":88},"java8","2026-09-12T08:22:34.154837Z",{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},"Java 8 新特性教程","\u002Fupload\u002Ftutorial-cover-java8.png","Java 8 新特性教程：Lambda、Stream API、Optional、新日期时间 API 与函数式编程。",false,{"permalink":95,"postCount":96,"visiblePostCount":96},"\u002Fcategories\u002Fjava8",20,[98,122,142,162,182,202,222,242,262,282,302,322,342,362,382,402,422,442,462,482],{"metadata":99,"spec":102,"status":113,"categories":117},{"name":100,"creationTimestamp":101},"post-java8-timezones-d136f398","2026-09-12T08:29:44.759663Z",{"title":103,"slug":104,"cover":105,"excerpt":106,"publishTime":108,"categories":109,"tags":110,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 Timezones 时区","java8-timezones","",{"raw":107,"autoGenerate":93},"ZoneId 代表时区类。通过静态工厂方法方便地获取它，入参我们可以传入某个时区编码。另外，时区类还定义了一个偏移量，用来在当前时刻或某时间\r\n与目标时区时间之间进行转换。","2026-09-12T08:29:44.816682Z",[87],[],"PUBLIC",true,{"permalink":114,"excerpt":107,"lastModifyTime":115,"phase":116},"\u002Farchives\u002Fjava8-timezones","2026-09-12T08:29:44.762611Z","PUBLISHED",[118],{"metadata":119,"spec":120,"status":121,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":123,"spec":126,"status":134,"categories":137},{"name":124,"creationTimestamp":125},"post-java8-supplier-effd6dc5","2026-09-12T08:29:44.154617Z",{"title":127,"slug":128,"cover":105,"excerpt":129,"publishTime":131,"categories":132,"tags":133,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 Supplier 函数式接口","java8-supplier",{"raw":130,"autoGenerate":93},"Supplier 接口代表一个不接受参数但返回结果的操作。它在 Java 中被广泛用于懒加载或产生随机值等场景。","2026-09-12T08:29:44.212836Z",[87],[],{"permalink":135,"excerpt":130,"lastModifyTime":136,"phase":116},"\u002Farchives\u002Fjava8-supplier","2026-09-12T08:29:44.157805Z",[138],{"metadata":139,"spec":140,"status":141,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":143,"spec":146,"status":154,"categories":157},{"name":144,"creationTimestamp":145},"post-java8-stream-sorted-2177586c","2026-09-12T08:29:43.450940Z",{"title":147,"slug":148,"cover":105,"excerpt":149,"publishTime":151,"categories":152,"tags":153,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 Stream 流 Sorted 排序","java8-stream-sorted",{"raw":150,"autoGenerate":93},"在 Java 1.8 中，Stream API 提供了 sorted() 方法用于对流中的元素进行排序。sorted() 方法可以根据元素的自然顺序（如果元素实现了 Comparable 接口）或者根据指定的比较器进行排序。","2026-09-12T08:29:43.515927Z",[87],[],{"permalink":155,"excerpt":150,"lastModifyTime":156,"phase":116},"\u002Farchives\u002Fjava8-stream-sorted","2026-09-12T08:29:43.454014Z",[158],{"metadata":159,"spec":160,"status":161,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":163,"spec":166,"status":174,"categories":177},{"name":164,"creationTimestamp":165},"post-java8-stream-reduce-d9c374ef","2026-09-12T08:29:42.530843Z",{"title":167,"slug":168,"cover":105,"excerpt":169,"publishTime":171,"categories":172,"tags":173,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 Stream 流 Reduce 规约合并","java8-stream-reduce",{"raw":170,"autoGenerate":93},"在 Java 1.8 中，Stream API 提供了 reduce() 方法用于将流中的元素进行归约操作。reduce() 方法允许我们根据指定的操作，将流中的元素合并为一个结果。","2026-09-12T08:29:42.734409Z",[87],[],{"permalink":175,"excerpt":170,"lastModifyTime":176,"phase":116},"\u002Farchives\u002Fjava8-stream-reduce","2026-09-12T08:29:42.534055Z",[178],{"metadata":179,"spec":180,"status":181,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":183,"spec":186,"status":194,"categories":197},{"name":184,"creationTimestamp":185},"post-java8-stream-match-efe9648c","2026-09-12T08:29:41.833057Z",{"title":187,"slug":188,"cover":105,"excerpt":189,"publishTime":191,"categories":192,"tags":193,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 Stream 流 Match 元素匹配","java8-stream-match",{"raw":190,"autoGenerate":93},"在 Java 1.8 中，Stream API 提供了 allMatch()、anyMatch() 和 noneMatch() 方法用于对流中的元素进行匹配操作。这些方法可以帮助我们快速判断流中的元素是否满足某个条件，从而返回一个布尔值。","2026-09-12T08:29:41.891265Z",[87],[],{"permalink":195,"excerpt":190,"lastModifyTime":196,"phase":116},"\u002Farchives\u002Fjava8-stream-match","2026-09-12T08:29:41.836386Z",[198],{"metadata":199,"spec":200,"status":201,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":203,"spec":206,"status":214,"categories":217},{"name":204,"creationTimestamp":205},"post-java8-stream-filter-932481d2","2026-09-12T08:29:40.916371Z",{"title":207,"slug":208,"cover":105,"excerpt":209,"publishTime":211,"categories":212,"tags":213,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 Stream 流 Filter 过滤","java8-stream-filter",{"raw":210,"autoGenerate":93},"在 Java 1.8 中，Stream 是一个用于操作集合元素的新 API。Stream API 提供了丰富的功能，其中之一就是 filter() 方法。filter() 方法可以用于过滤集合中的元素，根据指定的条件筛选出满足条件的元素，从而得到一个新的流。","2026-09-12T08:29:40.976437Z",[87],[],{"permalink":215,"excerpt":210,"lastModifyTime":216,"phase":116},"\u002Farchives\u002Fjava8-stream-filter","2026-09-12T08:29:40.919654Z",[218],{"metadata":219,"spec":220,"status":221,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":223,"spec":226,"status":234,"categories":237},{"name":224,"creationTimestamp":225},"post-java8-stream-count-67639222","2026-09-12T08:29:40.075806Z",{"title":227,"slug":228,"cover":105,"excerpt":229,"publishTime":231,"categories":232,"tags":233,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 Stream 流 Count 计数","java8-stream-count",{"raw":230,"autoGenerate":93},"在 Java 1.8 中，Stream API 提供了 count() 方法用于计算流中的元素个数。count() 方法返回一个 long 类型的值，表示流中元素的数量。","2026-09-12T08:29:40.133568Z",[87],[],{"permalink":235,"excerpt":230,"lastModifyTime":236,"phase":116},"\u002Farchives\u002Fjava8-stream-count","2026-09-12T08:29:40.078976Z",[238],{"metadata":239,"spec":240,"status":241,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":243,"spec":246,"status":254,"categories":257},{"name":244,"creationTimestamp":245},"post-java8-predicate-a40f5246","2026-09-12T08:29:39.401754Z",{"title":247,"slug":248,"cover":105,"excerpt":249,"publishTime":251,"categories":252,"tags":253,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 Predicate 断言函数式接口","java8-predicate",{"raw":250,"autoGenerate":93},"在 Java 1.8 之前，我们在对集合进行筛选和过滤时，通常需要使用循环和条件语句来手动实现。而 Java 1.8 引入的 Predicate 断言接口，为我们提供了一种简单且优雅的方法来进行集合元素的筛选。","2026-09-12T08:29:39.462661Z",[87],[],{"permalink":255,"excerpt":250,"lastModifyTime":256,"phase":116},"\u002Farchives\u002Fjava8-predicate","2026-09-12T08:29:39.404668Z",[258],{"metadata":259,"spec":260,"status":261,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":263,"spec":266,"status":274,"categories":277},{"name":264,"creationTimestamp":265},"post-java8-map-convert-c4312a2d","2026-09-12T08:29:38.790451Z",{"title":267,"slug":268,"cover":105,"excerpt":269,"publishTime":271,"categories":272,"tags":273,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 Stream 流 Map 元素转换","java8-map-convert",{"raw":270,"autoGenerate":93},"在 Java 1.8 中，Stream API 提供了 map() 方法用于对流中的元素进行转换操作。map() 方法可以将流中的每个元素映射为另一个值，从而得到一个新的流。","2026-09-12T08:29:38.847401Z",[87],[],{"permalink":275,"excerpt":270,"lastModifyTime":276,"phase":116},"\u002Farchives\u002Fjava8-map-convert","2026-09-12T08:29:38.793548Z",[278],{"metadata":279,"spec":280,"status":281,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":283,"spec":286,"status":294,"categories":297},{"name":284,"creationTimestamp":285},"post-java8-localtime-95207726","2026-09-12T08:29:38.133376Z",{"title":287,"slug":288,"cover":105,"excerpt":289,"publishTime":291,"categories":292,"tags":293,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 LocalTime 时间","java8-localtime",{"raw":290,"autoGenerate":93},"在 Java 8 之前，我们通常使用 java.util.Date 类和 java.util.Calendar 类来表示和操作日期和时间。然而，这些类存在许多问题，例如不支持时区，API 设计不直观等。为了解决这些问题，Java 8 引入了全新的日期和时间 API，其中包括 LocalTime 类。","2026-09-12T08:29:38.188501Z",[87],[],{"permalink":295,"excerpt":290,"lastModifyTime":296,"phase":116},"\u002Farchives\u002Fjava8-localtime","2026-09-12T08:29:38.136869Z",[298],{"metadata":299,"spec":300,"status":301,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":303,"spec":306,"status":314,"categories":317},{"name":304,"creationTimestamp":305},"post-java8-localdatetime-95f2a0ee","2026-09-12T08:29:37.466020Z",{"title":307,"slug":308,"cover":105,"excerpt":309,"publishTime":311,"categories":312,"tags":313,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 LocalDateTime 日期时间","java8-localdatetime",{"raw":310,"autoGenerate":93},"LocalDateTime 是 Java 8 中一个不可变的日期-时间对象，它表示了日期（年、月、日）和时间（小时、分钟、秒），但不包含时区。","2026-09-12T08:29:37.520571Z",[87],[],{"permalink":315,"excerpt":310,"lastModifyTime":316,"phase":116},"\u002Farchives\u002Fjava8-localdatetime","2026-09-12T08:29:37.469233Z",[318],{"metadata":319,"spec":320,"status":321,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":323,"spec":326,"status":334,"categories":337},{"name":324,"creationTimestamp":325},"post-java8-localdate-2407e273","2026-09-12T08:29:36.753368Z",{"title":327,"slug":328,"cover":105,"excerpt":329,"publishTime":331,"categories":332,"tags":333,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 LocalDate 日期","java8-localdate",{"raw":330,"autoGenerate":93},"LocalDate 是 Java 8 中用于处理日期的不可变类，它只包含日期部分（年、月、日），没有时间和时区。","2026-09-12T08:29:36.847631Z",[87],[],{"permalink":335,"excerpt":330,"lastModifyTime":336,"phase":116},"\u002Farchives\u002Fjava8-localdate","2026-09-12T08:29:36.756533Z",[338],{"metadata":339,"spec":340,"status":341,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":343,"spec":346,"status":354,"categories":357},{"name":344,"creationTimestamp":345},"post-java8-lambda-access-variables-970cbd1d","2026-09-12T08:29:35.499263Z",{"title":347,"slug":348,"cover":105,"excerpt":349,"publishTime":351,"categories":352,"tags":353,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 Lambda 访问局部变量","java8-lambda-access-variables",{"raw":350,"autoGenerate":93},"在 Lambda 表达式中，我们可以访问外部的 final 类型变量，如下面的示例代码...","2026-09-12T08:29:35.598483Z",[87],[],{"permalink":355,"excerpt":350,"lastModifyTime":356,"phase":116},"\u002Farchives\u002Fjava8-lambda-access-variables","2026-09-12T08:29:35.502061Z",[358],{"metadata":359,"spec":360,"status":361,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":363,"spec":366,"status":374,"categories":377},{"name":364,"creationTimestamp":365},"post-java8-lambda-access-member-var-and-static-var-fb2278de","2026-09-12T08:29:34.640284Z",{"title":367,"slug":368,"cover":105,"excerpt":369,"publishTime":371,"categories":372,"tags":373,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 Lambda 访问成员变量和静态变量","java8-lambda-access-member-var-and-static-var",{"raw":370,"autoGenerate":93},"上一章节中，了解了如何在 Lambda 表达式中访问局部变量。与局部变量相比，在 Lambda 表达式中对成员变量和静态变量拥有读写权限...","2026-09-12T08:29:34.692814Z",[87],[],{"permalink":375,"excerpt":370,"lastModifyTime":376,"phase":116},"\u002Farchives\u002Fjava8-lambda-access-member-var-and-static-var","2026-09-12T08:29:34.643687Z",[378],{"metadata":379,"spec":380,"status":381,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":383,"spec":386,"status":394,"categories":397},{"name":384,"creationTimestamp":385},"post-java8-lambda-access-interface-default-method-2dad0242","2026-09-12T08:29:34.031524Z",{"title":387,"slug":388,"cover":105,"excerpt":389,"publishTime":391,"categories":392,"tags":393,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 Lambda 访问接口的默认方法","java8-lambda-access-interface-default-method",{"raw":390,"autoGenerate":93},"本小节中，我们将学习 Java 1.8 中如何在 Lambda 中访问接口的默认方法...","2026-09-12T08:29:34.082356Z",[87],[],{"permalink":395,"excerpt":390,"lastModifyTime":396,"phase":116},"\u002Farchives\u002Fjava8-lambda-access-interface-default-method","2026-09-12T08:29:34.034351Z",[398],{"metadata":399,"spec":400,"status":401,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":403,"spec":406,"status":414,"categories":417},{"name":404,"creationTimestamp":405},"post-java8-function-63dfbe63","2026-09-12T08:29:33.411024Z",{"title":407,"slug":408,"cover":105,"excerpt":409,"publishTime":411,"categories":412,"tags":413,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 Function 函数式接口","java8-function",{"raw":410,"autoGenerate":93},"当 Java 1.8 引入函数式接口时，Function 成为了其中一个重要的接口。Function 接口代表一个接受一个参数并且产生结果的操作。它在 Java 中被广泛用于函数式编程以及 Stream API 中的转换操作。","2026-09-12T08:29:33.468397Z",[87],[],{"permalink":415,"excerpt":410,"lastModifyTime":416,"phase":116},"\u002Farchives\u002Fjava8-function","2026-09-12T08:29:33.413849Z",[418],{"metadata":419,"spec":420,"status":421,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":423,"spec":426,"status":434,"categories":437},{"name":424,"creationTimestamp":425},"post-java8-consumer-f342cdbd","2026-09-12T08:29:32.773097Z",{"title":427,"slug":428,"cover":105,"excerpt":429,"publishTime":431,"categories":432,"tags":433,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 Consumer 消费者函数式接口","java8-consumer",{"raw":430,"autoGenerate":93},"Consumer 接口代表一个接受一个参数并且不返回结果的操作。它在 Java 中被广泛用于遍历集合或执行消费型操作。","2026-09-12T08:29:32.831051Z",[87],[],{"permalink":435,"excerpt":430,"lastModifyTime":436,"phase":116},"\u002Farchives\u002Fjava8-consumer","2026-09-12T08:29:32.776825Z",[438],{"metadata":439,"spec":440,"status":441,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":443,"spec":446,"status":454,"categories":457},{"name":444,"creationTimestamp":445},"post-java8-comparator-7c6e8711","2026-09-12T08:29:32.075441Z",{"title":447,"slug":448,"cover":105,"excerpt":449,"publishTime":451,"categories":452,"tags":453,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 Comparator 比较函数式接口","java8-comparator",{"raw":450,"autoGenerate":93},"Comparator 接口常用于比较操作，它在集合排序、搜索、自定义排序等场景中提供了灵活的比较策略。","2026-09-12T08:29:32.168878Z",[87],[],{"permalink":455,"excerpt":450,"lastModifyTime":456,"phase":116},"\u002Farchives\u002Fjava8-comparator","2026-09-12T08:29:32.078744Z",[458],{"metadata":459,"spec":460,"status":461,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":463,"spec":466,"status":474,"categories":477},{"name":464,"creationTimestamp":465},"post-java8-clock-336b78c3","2026-09-12T08:29:31.395365Z",{"title":467,"slug":468,"cover":105,"excerpt":469,"publishTime":471,"categories":472,"tags":473,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 Clock","java8-clock",{"raw":470,"autoGenerate":93},"Clock 提供对当前日期和时间的访问。我们可以利用它来替代 System.currentTimeMillis() 方法。另外，通过 clock.instant() 能够获取一个 instant 实例...","2026-09-12T08:29:31.447789Z",[87],[],{"permalink":475,"excerpt":470,"lastModifyTime":476,"phase":116},"\u002Farchives\u002Fjava8-clock","2026-09-12T08:29:31.398896Z",[478],{"metadata":479,"spec":480,"status":481,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":483,"spec":486,"status":494,"categories":497},{"name":484,"creationTimestamp":485},"post-java8-bifunction-e5cfa561","2026-09-12T08:29:30.804052Z",{"title":487,"slug":488,"cover":105,"excerpt":489,"publishTime":491,"categories":492,"tags":493,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Java 1.8 BiFunction 函数式接口","java8-bifunction",{"raw":490,"autoGenerate":93},"BiFunction 接口代表一个接受两个参数并产生结果的操作。它在 Java 中**被广泛用于对两个输入参数进行操作，然后返回一个结果。","2026-09-12T08:29:30.861518Z",[87],[],{"permalink":495,"excerpt":490,"lastModifyTime":496,"phase":116},"\u002Farchives\u002Fjava8-bifunction","2026-09-12T08:29:30.807504Z",[498],{"metadata":499,"spec":500,"status":501,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":503,"spec":504,"status":508,"categories":509,"content":514},{"name":424,"creationTimestamp":425},{"title":427,"slug":428,"cover":105,"excerpt":505,"publishTime":431,"categories":506,"tags":507,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},{"raw":430,"autoGenerate":93},[87],[],{"permalink":435,"excerpt":430,"lastModifyTime":436,"phase":116},[510],{"metadata":511,"spec":512,"status":513,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"content":515,"raw":515},"\u003Cp>Consumer 接口\u003Cstrong>代表一个接受一个参数并且不返回结果的操作\u003C\u002Fstrong>。它在 Java 中\u003Cstrong>被广泛用于遍历集合或执行消费型操作。\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>本小节中将深入介绍 Java 1.8 中的 Consumer 接口，并通过示例代码演示如何使用它。\u003C\u002Fp>\n\u003Ch2>Consumer 接口概览\u003C\u002Fh2>\n\u003Cp>在 \u003Ccode>java.util.function\u003C\u002Fcode> 包中，Consumer 接口定义如下：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>@FunctionalInterface\npublic interface Consumer<T> {\n    void accept(T t);\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cul>\n\u003Cli>\u003Ccode>T\u003C\u002Fcode> 表示输入参数的类型。\u003C\u002Fli>\n\u003Cli>\u003Ccode>accept(T t)\u003C\u002Fcode> 是 Consumer 接口中唯一的抽象方法，用于对输入参数 \u003Ccode>t\u003C\u002Fcode> 进行操作。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Consumer 接口是一个泛型接口，它可以接受不同类型的参数。\u003C\u002Fp>\n\u003Ch2>使用 Consumer 接口\u003C\u002Fh2>\n\u003Cp>让我们通过几个示例来说明如何使用 Consumer 接口。\u003C\u002Fp>\n\u003Ch3>示例 1：打印元素\u003C\u002Fh3>\n\u003Cp>创建一个 Consumer 接口实例，用于打印集合中的元素。\u003C\u002Fp>\n\u003Cpre>\u003Ccode>Consumer<String> printString = str -> System.out.println(str);\n\nList<String> names = Arrays.asList("Alice", "Bob", "Charlie", "David");\nnames.forEach(printString);\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>在这个例子中，我们创建了一个 Consumer 对象 \u003Ccode>printString\u003C\u002Fcode>，它用于打印字符串。然后，我们使用 forEach 方法遍历集合，并将每个元素传递给 Consumer 的 \u003Ccode>accept()\u003C\u002Fcode> 方法，实现打印操作。\u003C\u002Fp>\n\u003Ch3>示例 2：消费元素\u003C\u002Fh3>\n\u003Cp>使用 Consumer 接口对集合中的元素进行消费型操作。\u003C\u002Fp>\n\u003Cpre>\u003Ccode>List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);\n\nConsumer<Integer> multiplyByTwo = num -> {\n\t\u002F\u002F 对入参进行乘 2 操作\n    int result = num * 2;\n    System.out.println("Result: " + result);\n};\n\nnumbers.forEach(multiplyByTwo);\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>在这个例子中，我们创建了一个 Consumer 对象 \u003Ccode>multiplyByTwo\u003C\u002Fcode>，它将传入的整数乘以2，并输出结果。然后，我们使用 forEach 方法遍历集合，并将每个元素传递给 Consumer 的 \u003Ccode>accept()\u003C\u002Fcode> 方法，实现对元素的消费型操作。\u003C\u002Fp>\n\u003Ch3>示例 3：集合元素求和\u003C\u002Fh3>\n\u003Cp>使用 Consumer 接口对集合中的元素进行求和操作。\u003C\u002Fp>\n\u003Cpre>\u003Ccode>List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);\n\n\u002F\u002F 使用 AtomicInteger 来保存结果\nAtomicInteger sum = new AtomicInteger();\n\nConsumer<Integer> addToSum = num -> sum.addAndGet(num);\n\nnumbers.forEach(addToSum);\n\nSystem.out.println("Sum: " + sum); \u002F\u002F 输出 "Sum: 15"\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>在这个例子中，我们创建了一个 Consumer 对象 \u003Ccode>addToSum\u003C\u002Fcode>，它将传入的整数添加到 AtomicInteger 中，并实现对元素的求和操作。然后，我们使用 forEach 方法遍历集合，并将每个元素传递给 Consumer 的 \u003Ccode>accept()\u003C\u002Fcode> 方法，实现对元素的求和。\u003C\u002Fp>\n\u003Ch2>Consumer 的组合\u003C\u002Fh2>\n\u003Cp>Consumer 还提供了一些默认方法用于函数的组合：\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Ccode>andThen(Consumer after)\u003C\u002Fcode>: 返回一个新的 Consumer，它表示当前 Consumer 和另一个 Consumer 的顺序执行。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>下面是一个组合示例：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>Consumer<String> printUpperCase = str -> System.out.println(str.toUpperCase());\nConsumer<String> printLowerCase = str -> System.out.println(str.toLowerCase());\n\nConsumer<String> printAndThen = printUpperCase.andThen(printLowerCase);\n\nprintAndThen.accept("Hello, World!"); \u002F\u002F 输出 "HELLO, WORLD!" 和 "hello, world!"\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>在这个例子中，我们首先创建了两个 Consumer 对象 \u003Ccode>printUpperCase\u003C\u002Fcode> 和 \u003Ccode>printLowerCase\u003C\u002Fcode>，分别打印字符串的大写和小写形式。然后，我们使用 \u003Ccode>andThen()\u003C\u002Fcode> 方法将这两个 Consumer 组合成一个新的 Consumer \u003Ccode>printAndThen\u003C\u002Fcode>，它先执行打印大写形式，然后再执行打印小写形式。\u003C\u002Fp>\n\u003Ch2>总结\u003C\u002Fh2>\n\u003Cp>Java 1.8 中的 Consumer 接口为函数式编程提供了重要的支持。通过使用 Consumer 接口，我们可以轻松地定义并执行一个接受一个参数并且不返回结果的操作。Consumer 接口特别适用于遍历集合或执行消费型操作。\u003C\u002Fp>\n13:T38d6,\u003Cp>Consumer 接口\u003Cstrong>代表一个接受一个参数并且不返回结果的操作\u003C\u002Fstrong>。它在 Java 中\u003Cstrong>被广泛用于遍历集合或执行消费型操作。\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>本小节中将深入介绍 Java 1.8 中的 Consumer 接口，并通过示例代码演示如何使用它。\u003C\u002Fp>\n\u003Ch2 id=\"toc-0\">Consumer 接口概览\u003C\u002Fh2>\n\u003Cp>在 \u003Ccode>java.util.function\u003C\u002Fcode> 包中，Consumer 接口定义如下：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%40FunctionalInterface%0Apublic%20interface%20Consumer%3CT%3E%20%7B%0A%20%20%20%20void%20accept(T%20t)%3B%0A%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">\u003Cspan class=\"token annotation punctuation\">@FunctionalInterface\u003C\u002Fspan>\n\u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">interface\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Consumer\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">accept\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan> t\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cul>\n\u003Cli>\u003Ccode>T\u003C\u002Fcode> 表示输入参数的类型。\u003C\u002Fli>\n\u003Cli>\u003Ccode>accept(T t)\u003C\u002Fcode> 是 Consumer 接口中唯一的抽象方法，用于对输入参数 \u003Ccode>t\u003C\u002Fcode> 进行操作。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Consumer 接口是一个泛型接口，它可以接受不同类型的参数。\u003C\u002Fp>\n\u003Ch2 id=\"toc-1\">使用 Consumer 接口\u003C\u002Fh2>\n\u003Cp>让我们通过几个示例来说明如何使用 Consumer 接口。\u003C\u002Fp>\n\u003Ch3 id=\"toc-2\">示例 1：打印元素\u003C\u002Fh3>\n\u003Cp>创建一个 Consumer 接口实例，用于打印集合中的元素。\u003C\u002Fp>\n\u003Cdiv class=\"language-javascript\" data-ext=\"javascript\" data-code=\"Consumer%3CString%3E%20printString%20%3D%20str%20-%3E%20System.out.println(str)%3B%0A%0AList%3CString%3E%20names%20%3D%20Arrays.asList(%22Alice%22%2C%20%22Bob%22%2C%20%22Charlie%22%2C%20%22David%22)%3B%0Anames.forEach(printString)%3B%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-javascript\">Consumer\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token operator\">>\u003C\u002Fspan> printString \u003Cspan class=\"token operator\">=\u003C\u002Fspan> str \u003Cspan class=\"token operator\">-\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> System\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>out\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">println\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>str\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\nList\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token operator\">>\u003C\u002Fspan> names \u003Cspan class=\"token operator\">=\u003C\u002Fspan> Arrays\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">asList\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"Alice\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">\"Bob\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">\"Charlie\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">\"David\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\nnames\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">forEach\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>printString\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>在这个例子中，我们创建了一个 Consumer 对象 \u003Ccode>printString\u003C\u002Fcode>，它用于打印字符串。然后，我们使用 forEach 方法遍历集合，并将每个元素传递给 Consumer 的 \u003Ccode>accept()\u003C\u002Fcode> 方法，实现打印操作。\u003C\u002Fp>\n\u003Ch3 id=\"toc-3\">示例 2：消费元素\u003C\u002Fh3>\n\u003Cp>使用 Consumer 接口对集合中的元素进行消费型操作。\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"List%3CInteger%3E%20numbers%20%3D%20Arrays.asList(1%2C%202%2C%203%2C%204%2C%205)%3B%0A%0AConsumer%3CInteger%3E%20multiplyByTwo%20%3D%20num%20-%3E%20%7B%0A%09%2F%2F%20%E5%AF%B9%E5%85%A5%E5%8F%82%E8%BF%9B%E8%A1%8C%E4%B9%98%202%20%E6%93%8D%E4%BD%9C%0A%20%20%20%20int%20result%20%3D%20num%20*%202%3B%0A%20%20%20%20System.out.println(%22Result%3A%20%22%20%2B%20result)%3B%0A%7D%3B%0A%0Anumbers.forEach(multiplyByTwo)%3B%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">\u003Cspan class=\"token class-name\">List\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> numbers \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Arrays\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">asList\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">2\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">3\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">4\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">5\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n\u003Cspan class=\"token class-name\">Consumer\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> multiplyByTwo \u003Cspan class=\"token operator\">=\u003C\u002Fspan> num \u003Cspan class=\"token operator\">->\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 对入参进行乘 2 操作\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">int\u003C\u002Fspan> result \u003Cspan class=\"token operator\">=\u003C\u002Fspan> num \u003Cspan class=\"token operator\">*\u003C\u002Fspan> \u003Cspan class=\"token number\">2\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">System\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>out\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">println\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"Result: \"\u003C\u002Fspan> \u003Cspan class=\"token operator\">+\u003C\u002Fspan> result\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\nnumbers\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">forEach\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>multiplyByTwo\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>在这个例子中，我们创建了一个 Consumer 对象 \u003Ccode>multiplyByTwo\u003C\u002Fcode>，它将传入的整数乘以2，并输出结果。然后，我们使用 forEach 方法遍历集合，并将每个元素传递给 Consumer 的 \u003Ccode>accept()\u003C\u002Fcode> 方法，实现对元素的消费型操作。\u003C\u002Fp>\n\u003Ch3 id=\"toc-4\">示例 3：集合元素求和\u003C\u002Fh3>\n\u003Cp>使用 Consumer 接口对集合中的元素进行求和操作。\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"List%3CInteger%3E%20numbers%20%3D%20Arrays.asList(1%2C%202%2C%203%2C%204%2C%205)%3B%0A%0A%2F%2F%20%E4%BD%BF%E7%94%A8%20AtomicInteger%20%E6%9D%A5%E4%BF%9D%E5%AD%98%E7%BB%93%E6%9E%9C%0AAtomicInteger%20sum%20%3D%20new%20AtomicInteger()%3B%0A%0AConsumer%3CInteger%3E%20addToSum%20%3D%20num%20-%3E%20sum.addAndGet(num)%3B%0A%0Anumbers.forEach(addToSum)%3B%0A%0ASystem.out.println(%22Sum%3A%20%22%20%2B%20sum)%3B%20%2F%2F%20%E8%BE%93%E5%87%BA%20%22Sum%3A%2015%22%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">\u003Cspan class=\"token class-name\">List\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> numbers \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Arrays\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">asList\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">2\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">3\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">4\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">5\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n\u003Cspan class=\"token comment\">\u002F\u002F 使用 AtomicInteger 来保存结果\u003C\u002Fspan>\n\u003Cspan class=\"token class-name\">AtomicInteger\u003C\u002Fspan> sum \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">new\u003C\u002Fspan> \u003Cspan class=\"token class-name\">AtomicInteger\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n\u003Cspan class=\"token class-name\">Consumer\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> addToSum \u003Cspan class=\"token operator\">=\u003C\u002Fspan> num \u003Cspan class=\"token operator\">->\u003C\u002Fspan> sum\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">addAndGet\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>num\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\nnumbers\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">forEach\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>addToSum\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n\u003Cspan class=\"token class-name\">System\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>out\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">println\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"Sum: \"\u003C\u002Fspan> \u003Cspan class=\"token operator\">+\u003C\u002Fspan> sum\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan> \u003Cspan class=\"token comment\">\u002F\u002F 输出 \"Sum: 15\"\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>在这个例子中，我们创建了一个 Consumer 对象 \u003Ccode>addToSum\u003C\u002Fcode>，它将传入的整数添加到 AtomicInteger 中，并实现对元素的求和操作。然后，我们使用 forEach 方法遍历集合，并将每个元素传递给 Consumer 的 \u003Ccode>accept()\u003C\u002Fcode> 方法，实现对元素的求和。\u003C\u002Fp>\n\u003Ch2 id=\"toc-5\">Consumer 的组合\u003C\u002Fh2>\n\u003Cp>Consumer 还提供了一些默认方法用于函数的组合：\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Ccode>andThen(Consumer after)\u003C\u002Fcode>: 返回一个新的 Consumer，它表示当前 Consumer 和另一个 Consumer 的顺序执行。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>下面是一个组合示例：\u003C\u002Fp>\n\u003Cdiv class=\"language-javascript\" data-ext=\"javascript\" data-code=\"Consumer%3CString%3E%20printUpperCase%20%3D%20str%20-%3E%20System.out.println(str.toUpperCase())%3B%0AConsumer%3CString%3E%20printLowerCase%20%3D%20str%20-%3E%20System.out.println(str.toLowerCase())%3B%0A%0AConsumer%3CString%3E%20printAndThen%20%3D%20printUpperCase.andThen(printLowerCase)%3B%0A%0AprintAndThen.accept(%22Hello%2C%20World!%22)%3B%20%2F%2F%20%E8%BE%93%E5%87%BA%20%22HELLO%2C%20WORLD!%22%20%E5%92%8C%20%22hello%2C%20world!%22%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-javascript\">Consumer\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token operator\">>\u003C\u002Fspan> printUpperCase \u003Cspan class=\"token operator\">=\u003C\u002Fspan> str \u003Cspan class=\"token operator\">-\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> System\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>out\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">println\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>str\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">toUpperCase\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\nConsumer\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token operator\">>\u003C\u002Fspan> printLowerCase \u003Cspan class=\"token operator\">=\u003C\u002Fspan> str \u003Cspan class=\"token operator\">-\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> System\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>out\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">println\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>str\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">toLowerCase\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\nConsumer\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token operator\">>\u003C\u002Fspan> printAndThen \u003Cspan class=\"token operator\">=\u003C\u002Fspan> printUpperCase\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">andThen\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>printLowerCase\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\nprintAndThen\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">accept\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"Hello, World!\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan> \u003Cspan class=\"token comment\">\u002F\u002F 输出 \"HELLO, WORLD!\" 和 \"hello, world!\"\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>在这个例子中，我们首先创建了两个 Consumer 对象 \u003Ccode>printUpperCase\u003C\u002Fcode> 和 \u003Ccode>printLowerCase\u003C\u002Fcode>，分别打印字符串的大写和小写形式。然后，我们使用 \u003Ccode>andThen()\u003C\u002Fcode> 方法将这两个 Consumer 组合成一个新的 Consumer \u003Ccode>printAndThen\u003C\u002Fcode>，它先执行打印大写形式，然后再执行打印小写形式。\u003C\u002Fp>\n\u003Ch2 id=\"toc-6\">总结\u003C\u002Fh2>\n\u003Cp>Java 1.8 中的 Consumer 接口为函数式编程提供了重要的支持。通过使用 Consumer 接口，我们可以轻松地定义并执行一个接受一个参数并且不返回结果的操作。Consumer 接口特别适用于遍历集合或执行消费型操作。\u003C\u002Fp>"]