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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 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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":244,"creationTimestamp":245},{"title":247,"slug":248,"cover":105,"excerpt":505,"publishTime":251,"categories":506,"tags":507,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},{"raw":250,"autoGenerate":93},[87],[],{"permalink":255,"excerpt":250,"lastModifyTime":256,"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>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 \u003Ccode>Predicate\u003C\u002Fcode> 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。\u003C\u002Fp>\n\u003Ch2>什么是 Predicate？\u003C\u002Fh2>\n\u003Cp>Predicate 是一个函数式接口，它代表了一个接受一个参数并返回布尔值的函数。\u003Cstrong>它通常用于对集合中的元素进行筛选、过滤或判断。\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>在 \u003Ccode>java.util.function\u003C\u002Fcode> 包中，\u003Ccode>Predicate\u003C\u002Fcode> 接口定义如下：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>@FunctionalInterface\npublic interface Predicate<T> {\n    boolean test(T t);\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>可以看到，\u003Ccode>Predicate\u003C\u002Fcode> 是一个泛型接口，\u003Ccode>T\u003C\u002Fcode> 表示传入的参数类型。它只有一个抽象方法 \u003Ccode>test(T t)\u003C\u002Fcode>，用于对传入的参数进行条件判断，并返回一个布尔值，表示传入的参数是否满足特定条件。\u003C\u002Fp>\n\u003Ch2>如何使用 Predicate？\u003C\u002Fh2>\n\u003Cp>使用 \u003Ccode>Predicate\u003C\u002Fcode> 非常简单。首先，我们需要实现 \u003Ccode>Predicate\u003C\u002Fcode> 接口的抽象方法 \u003Ccode>test(T t)\u003C\u002Fcode>，然后将该实现传递给需要进行条件判断的方法。\u003C\u002Fp>\n\u003Cp>假设我们有一个存储整数的集合，我们想筛选出其中的偶数。在 Java 1.8 之前，我们可能会这样写：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);\nList<Integer> evenNumbers = new ArrayList<>();\n\nfor (Integer num : numbers) {\n    if (num % 2 == 0) {\n        evenNumbers.add(num);\n    }\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>然而，使用 \u003Ccode>Predicate\u003C\u002Fcode>，我们可以这样写：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);\nList<Integer> evenNumbers = numbers.stream()\n                                  .filter(num -> num % 2 == 0)\n                                  .collect(Collectors.toList());\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>在上述代码中，我们使用了 \u003Ccode>filter()\u003C\u002Fcode> 方法来进行筛选。\u003Ccode>filter()\u003C\u002Fcode> 方法接受一个 \u003Ccode>Predicate\u003C\u002Fcode> 参数，表示我们希望保留满足条件的元素。在这里，我们使用 Lambda 表达式 \u003Ccode>num -> num % 2 == 0\u003C\u002Fcode> 来实现 \u003Ccode>Predicate\u003C\u002Fcode> 接口，并判断整数是否为偶数。\u003C\u002Fp>\n\u003Ch2>组合 Predicate\u003C\u002Fh2>\n\u003Cp>有时候，我们需要对多个条件进行组合，可以使用 \u003Ccode>Predicate\u003C\u002Fcode> 提供的默认方法来实现。\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Ccode>and(Predicate other)\u003C\u002Fcode>: 返回一个新的 \u003Ccode>Predicate\u003C\u002Fcode>，它表示当前 \u003Ccode>Predicate\u003C\u002Fcode> 和另一个 \u003Ccode>Predicate\u003C\u002Fcode> 的逻辑与（\u003Ccode>AND\u003C\u002Fcode>）操作。\u003C\u002Fli>\n\u003Cli>\u003Ccode>or(Predicate other)\u003C\u002Fcode>: 返回一个新的 \u003Ccode>Predicate\u003C\u002Fcode>，它表示当前 \u003Ccode>Predicate\u003C\u002Fcode> 和另一个 \u003Ccode>Predicate\u003C\u002Fcode> 的逻辑或（\u003Ccode>OR\u003C\u002Fcode>）操作。\u003C\u002Fli>\n\u003Cli>\u003Ccode>negate()\u003C\u002Fcode>: 返回当前 \u003Ccode>Predicate\u003C\u002Fcode> 的逻辑非（\u003Ccode>NOT\u003C\u002Fcode>）操作。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>下面是一个使用组合 \u003Ccode>Predicate\u003C\u002Fcode> 的例子：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>Predicate<Integer> isEven = num -> num % 2 == 0;\nPredicate<Integer> isGreaterThan5 = num -> num > 5;\n\nList<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);\n\nList<Integer> filteredNumbers = numbers.stream()\n                                       .filter(isEven.and(isGreaterThan5))\n                                       .collect(Collectors.toList());\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>在上述例子中，我们定义了两个 \u003Ccode>Predicate\u003C\u002Fcode> ：\u003Ccode>isEven\u003C\u002Fcode> 用于判断是否为偶数，\u003Ccode>isGreaterThan5\u003C\u002Fcode> 用于判断是否大于5。然后，我们使用 \u003Ccode>filter()\u003C\u002Fcode> 方法进行组合判断，并筛选出同时满足这两个条件的整数。\u003C\u002Fp>\n\u003Ch2>总结\u003C\u002Fh2>\n\u003Cp>\u003Ccode>Predicate\u003C\u002Fcode> 断言是 Java 1.8 引入的一个强大的函数式接口，它使得对集合元素进行条件筛选变得简单、优雅。通过实现 \u003Ccode>Predicate\u003C\u002Fcode> 接口的 \u003Ccode>test(T t)\u003C\u002Fcode> 方法，我们可以定义自己的条件判断逻辑，并在集合处理中使用 \u003Ccode>Predicate\u003C\u002Fcode> 进行筛选、过滤等操作。此外，我们还可以使用组合 \u003Ccode>Predicate\u003C\u002Fcode> 来实现多个条件的复合判断。\u003C\u002Fp>\n13:T2f62,\u003Cp>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 \u003Ccode>Predicate\u003C\u002Fcode> 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。\u003C\u002Fp>\n\u003Ch2 id=\"toc-0\">什么是 Predicate？\u003C\u002Fh2>\n\u003Cp>Predicate 是一个函数式接口，它代表了一个接受一个参数并返回布尔值的函数。\u003Cstrong>它通常用于对集合中的元素进行筛选、过滤或判断。\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>在 \u003Ccode>java.util.function\u003C\u002Fcode> 包中，\u003Ccode>Predicate\u003C\u002Fcode> 接口定义如下：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%40FunctionalInterface%0Apublic%20interface%20Predicate%3CT%3E%20%7B%0A%20%20%20%20boolean%20test(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\">Predicate\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\">boolean\u003C\u002Fspan> \u003Cspan class=\"token function\">test\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\u003Cp>可以看到，\u003Ccode>Predicate\u003C\u002Fcode> 是一个泛型接口，\u003Ccode>T\u003C\u002Fcode> 表示传入的参数类型。它只有一个抽象方法 \u003Ccode>test(T t)\u003C\u002Fcode>，用于对传入的参数进行条件判断，并返回一个布尔值，表示传入的参数是否满足特定条件。\u003C\u002Fp>\n\u003Ch2 id=\"toc-1\">如何使用 Predicate？\u003C\u002Fh2>\n\u003Cp>使用 \u003Ccode>Predicate\u003C\u002Fcode> 非常简单。首先，我们需要实现 \u003Ccode>Predicate\u003C\u002Fcode> 接口的抽象方法 \u003Ccode>test(T t)\u003C\u002Fcode>，然后将该实现传递给需要进行条件判断的方法。\u003C\u002Fp>\n\u003Cp>假设我们有一个存储整数的集合，我们想筛选出其中的偶数。在 Java 1.8 之前，我们可能会这样写：\u003C\u002Fp>\n\u003Cdiv class=\"language-xml\" data-ext=\"xml\" data-code=\"List%3CInteger%3E%20numbers%20%3D%20Arrays.asList(1%2C%202%2C%203%2C%204%2C%205%2C%206%2C%207%2C%208%2C%209%2C%2010)%3B%0AList%3CInteger%3E%20evenNumbers%20%3D%20new%20ArrayList%3C%3E()%3B%0A%0Afor%20(Integer%20num%20%3A%20numbers)%20%7B%0A%20%20%20%20if%20(num%20%25%202%20%3D%3D%200)%20%7B%0A%20%20%20%20%20%20%20%20evenNumbers.add(num)%3B%0A%20%20%20%20%7D%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-xml\">List\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>Integer\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);\nList\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>Integer\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> evenNumbers = new ArrayList<>();\n\nfor (Integer num : numbers) {\n    if (num % 2 == 0) {\n        evenNumbers.add(num);\n    }\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>然而，使用 \u003Ccode>Predicate\u003C\u002Fcode>，我们可以这样写：\u003C\u002Fp>\n\u003Cdiv class=\"language-sql\" data-ext=\"sql\" data-code=\"List%3CInteger%3E%20numbers%20%3D%20Arrays.asList(1%2C%202%2C%203%2C%204%2C%205%2C%206%2C%207%2C%208%2C%209%2C%2010)%3B%0AList%3CInteger%3E%20evenNumbers%20%3D%20numbers.stream()%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.filter(num%20-%3E%20num%20%25%202%20%3D%3D%200)%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.collect(Collectors.toList())%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-sql\">List\u003Cspan class=\"token operator\"><\u003C\u002Fspan>\u003Cspan class=\"token keyword\">Integer\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> numbers \u003Cspan class=\"token operator\">=\u003C\u002Fspan> Arrays\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>asList\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 number\">6\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">7\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">8\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">9\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">10\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\nList\u003Cspan class=\"token operator\"><\u003C\u002Fspan>\u003Cspan class=\"token keyword\">Integer\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> evenNumbers \u003Cspan class=\"token operator\">=\u003C\u002Fspan> numbers\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>stream\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n                                  \u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>filter\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>num \u003Cspan class=\"token operator\">-\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> num \u003Cspan class=\"token operator\">%\u003C\u002Fspan> \u003Cspan class=\"token number\">2\u003C\u002Fspan> \u003Cspan class=\"token operator\">=\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token number\">0\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n                                  \u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>collect\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>Collectors\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>toList\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\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>在上述代码中，我们使用了 \u003Ccode>filter()\u003C\u002Fcode> 方法来进行筛选。\u003Ccode>filter()\u003C\u002Fcode> 方法接受一个 \u003Ccode>Predicate\u003C\u002Fcode> 参数，表示我们希望保留满足条件的元素。在这里，我们使用 Lambda 表达式 \u003Ccode>num -> num % 2 == 0\u003C\u002Fcode> 来实现 \u003Ccode>Predicate\u003C\u002Fcode> 接口，并判断整数是否为偶数。\u003C\u002Fp>\n\u003Ch2 id=\"toc-2\">组合 Predicate\u003C\u002Fh2>\n\u003Cp>有时候，我们需要对多个条件进行组合，可以使用 \u003Ccode>Predicate\u003C\u002Fcode> 提供的默认方法来实现。\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Ccode>and(Predicate other)\u003C\u002Fcode>: 返回一个新的 \u003Ccode>Predicate\u003C\u002Fcode>，它表示当前 \u003Ccode>Predicate\u003C\u002Fcode> 和另一个 \u003Ccode>Predicate\u003C\u002Fcode> 的逻辑与（\u003Ccode>AND\u003C\u002Fcode>）操作。\u003C\u002Fli>\n\u003Cli>\u003Ccode>or(Predicate other)\u003C\u002Fcode>: 返回一个新的 \u003Ccode>Predicate\u003C\u002Fcode>，它表示当前 \u003Ccode>Predicate\u003C\u002Fcode> 和另一个 \u003Ccode>Predicate\u003C\u002Fcode> 的逻辑或（\u003Ccode>OR\u003C\u002Fcode>）操作。\u003C\u002Fli>\n\u003Cli>\u003Ccode>negate()\u003C\u002Fcode>: 返回当前 \u003Ccode>Predicate\u003C\u002Fcode> 的逻辑非（\u003Ccode>NOT\u003C\u002Fcode>）操作。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>下面是一个使用组合 \u003Ccode>Predicate\u003C\u002Fcode> 的例子：\u003C\u002Fp>\n\u003Cdiv class=\"language-sql\" data-ext=\"sql\" data-code=\"Predicate%3CInteger%3E%20isEven%20%3D%20num%20-%3E%20num%20%25%202%20%3D%3D%200%3B%0APredicate%3CInteger%3E%20isGreaterThan5%20%3D%20num%20-%3E%20num%20%3E%205%3B%0A%0AList%3CInteger%3E%20numbers%20%3D%20Arrays.asList(1%2C%202%2C%203%2C%204%2C%205%2C%206%2C%207%2C%208%2C%209%2C%2010)%3B%0A%0AList%3CInteger%3E%20filteredNumbers%20%3D%20numbers.stream()%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.filter(isEven.and(isGreaterThan5))%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.collect(Collectors.toList())%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-sql\">Predicate\u003Cspan class=\"token operator\"><\u003C\u002Fspan>\u003Cspan class=\"token keyword\">Integer\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> isEven \u003Cspan class=\"token operator\">=\u003C\u002Fspan> num \u003Cspan class=\"token operator\">-\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> num \u003Cspan class=\"token operator\">%\u003C\u002Fspan> \u003Cspan class=\"token number\">2\u003C\u002Fspan> \u003Cspan class=\"token operator\">=\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token number\">0\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\nPredicate\u003Cspan class=\"token operator\"><\u003C\u002Fspan>\u003Cspan class=\"token keyword\">Integer\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> isGreaterThan5 \u003Cspan class=\"token operator\">=\u003C\u002Fspan> num \u003Cspan class=\"token operator\">-\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> num \u003Cspan class=\"token operator\">>\u003C\u002Fspan> \u003Cspan class=\"token number\">5\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\nList\u003Cspan class=\"token operator\"><\u003C\u002Fspan>\u003Cspan class=\"token keyword\">Integer\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> numbers \u003Cspan class=\"token operator\">=\u003C\u002Fspan> Arrays\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>asList\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 number\">6\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">7\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">8\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">9\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">10\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\nList\u003Cspan class=\"token operator\"><\u003C\u002Fspan>\u003Cspan class=\"token keyword\">Integer\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> filteredNumbers \u003Cspan class=\"token operator\">=\u003C\u002Fspan> numbers\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>stream\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n                                       \u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>filter\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>isEven\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token operator\">and\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>isGreaterThan5\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n                                       \u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>collect\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>Collectors\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>toList\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\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>在上述例子中，我们定义了两个 \u003Ccode>Predicate\u003C\u002Fcode> ：\u003Ccode>isEven\u003C\u002Fcode> 用于判断是否为偶数，\u003Ccode>isGreaterThan5\u003C\u002Fcode> 用于判断是否大于5。然后，我们使用 \u003Ccode>filter()\u003C\u002Fcode> 方法进行组合判断，并筛选出同时满足这两个条件的整数。\u003C\u002Fp>\n\u003Ch2 id=\"toc-3\">总结\u003C\u002Fh2>\n\u003Cp>\u003Ccode>Predicate\u003C\u002Fcode> 断言是 Java 1.8 引入的一个强大的函数式接口，它使得对集合元素进行条件筛选变得简单、优雅。通过实现 \u003Ccode>Predicate\u003C\u002Fcode> 接口的 \u003Ccode>test(T t)\u003C\u002Fcode> 方法，我们可以定义自己的条件判断逻辑，并在集合处理中使用 \u003Ccode>Predicate\u003C\u002Fcode> 进行筛选、过滤等操作。此外，我们还可以使用组合 \u003Ccode>Predicate\u003C\u002Fcode> 来实现多个条件的复合判断。\u003C\u002Fp>"]