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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 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":404,"creationTimestamp":405},{"title":407,"slug":408,"cover":105,"excerpt":505,"publishTime":411,"categories":506,"tags":507,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},{"raw":410,"autoGenerate":93},[87],[],{"permalink":415,"excerpt":410,"lastModifyTime":416,"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>\u003Cstrong>Function 接口代表一个接受一个参数并且产生结果的操作\u003C\u002Fstrong>。它在 Java 中被广泛用于函数式编程以及 Stream API 中的\u003Cstrong>转换操作\u003C\u002Fstrong>。\u003C\u002Fp>\n\u003Cp>本小节将深入介绍 Java 1.8 中的 Function 接口，并通过示例代码演示如何使用它。\u003C\u002Fp>\n\u003Ch2>Function 接口概览\u003C\u002Fh2>\n\u003Cp>在 \u003Ccode>java.util.function\u003C\u002Fcode> 包中，Function 接口定义如下：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>@FunctionalInterface\npublic interface Function<T, R> {\n    R apply(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>R\u003C\u002Fcode> 表示返回结果的类型。\u003C\u002Fli>\n\u003Cli>\u003Ccode>apply(T t)\u003C\u002Fcode> 是 Function 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，并返回结果。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Function 接口是一个泛型接口，它可以接受不同类型的参数和返回不同类型的结果。\u003C\u002Fp>\n\u003Ch2>使用 Function 接口\u003C\u002Fh2>\n\u003Cp>接下来，让我们通过几个示例来说明如何使用 Function 接口。\u003C\u002Fp>\n\u003Ch3>示例 1：将字符串转换为大写\u003C\u002Fh3>\n\u003Cp>创建一个 Function 接口实例，将输入的字符串转换为大写形式。\u003C\u002Fp>\n\u003Cpre>\u003Ccode>Function<String, String> toUpperCaseFunc = str -> str.toUpperCase();\nString input = "hello, world!";\nString result = toUpperCaseFunc.apply(input);\nSystem.out.println(result); \u002F\u002F 输出 "HELLO, WORLD!"\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>在这个例子中，我们创建了一个 Function 对象 \u003Ccode>toUpperCaseFunc\u003C\u002Fcode>，它将字符串转换为大写形式。我们调用 \u003Ccode>apply()\u003C\u002Fcode> 方法来执行函数，将输入的字符串 "hello, world!" 转换为大写形式并输出结果。\u003C\u002Fp>\n\u003Ch3>示例 2：计算字符串的长度\u003C\u002Fh3>\n\u003Cp>使用 Function 接口计算字符串的长度。\u003C\u002Fp>\n\u003Cpre>\u003Ccode>Function<String, Integer> lengthFunc = str -> str.length();\nString input = "Java 1.8";\nint length = lengthFunc.apply(input);\nSystem.out.println("Length of '" + input + "' is: " + length); \u002F\u002F 输出 "Length of 'Java 1.8' is: 7"\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>在这个例子中，我们创建了一个 Function 对象 \u003Ccode>lengthFunc\u003C\u002Fcode>，它返回输入字符串的长度。我们调用 \u003Ccode>apply()\u003C\u002Fcode> 方法来执行函数，计算字符串 "Java 1.8" 的长度并输出结果。\u003C\u002Fp>\n\u003Ch3>示例 3：转换字符串为整数\u003C\u002Fh3>\n\u003Cp>使用 Function 接口将字符串转换为整数。\u003C\u002Fp>\n\u003Cpre>\u003Ccode>Function<String, Integer> parseIntFunc = str -> Integer.parseInt(str);\nString input = "12345";\nint number = parseIntFunc.apply(input);\nSystem.out.println("Parsed number: " + number); \u002F\u002F 输出 "Parsed number: 12345"\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>在这个例子中，我们创建了一个 Function 对象 \u003Ccode>parseIntFunc\u003C\u002Fcode>，它将字符串转换为整数。我们调用 \u003Ccode>apply()\u003C\u002Fcode> 方法来执行函数，将字符串 "12345" 转换为整数并输出结果。\u003C\u002Fp>\n\u003Ch2>Function 的组合\u003C\u002Fh2>\n\u003Cp>Function 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(Function after)\u003C\u002Fcode>: 返回一个先执行当前 Function 的 apply 方法，再执行 after Function 的 apply 方法的新 Function。\u003C\u002Fli>\n\u003Cli>\u003Ccode>compose(Function before)\u003C\u002Fcode>: 返回一个先执行 before Function 的 apply 方法，再执行当前 Function 的 apply 方法的新 Function。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>下面是一个组合示例：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>Function<String, Integer> parseToInt = str -> Integer.parseInt(str);\nFunction<Integer, Integer> square = num -> num * num;\n\nFunction<String, Integer> parseAndSquare = parseToInt.andThen(square);\n\nString input = "5";\nint result = parseAndSquare.apply(input);\nSystem.out.println("Parsed and squared result: " + result); \u002F\u002F 输出 "Parsed and squared result: 25"\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>在这个例子中，我们首先将字符串转换为整数，然后对整数进行平方运算，最终输出结果。\u003C\u002Fp>\n\u003Ch2>总结\u003C\u002Fh2>\n\u003Cp>Java 1.8 中的 Function 接口为函数式编程提供了强大的支持。通过使用 Function 接口，我们可以轻松地定义并执行接受一个参数并返回结果的操作。函数的组合使得函数式编程变得更加灵活和强大。\u003C\u002Fp>\n13:T32eb,\u003Cp>\u003Cstrong>Function 接口代表一个接受一个参数并且产生结果的操作\u003C\u002Fstrong>。它在 Java 中被广泛用于函数式编程以及 Stream API 中的\u003Cstrong>转换操作\u003C\u002Fstrong>。\u003C\u002Fp>\n\u003Cp>本小节将深入介绍 Java 1.8 中的 Function 接口，并通过示例代码演示如何使用它。\u003C\u002Fp>\n\u003Ch2 id=\"toc-0\">Function 接口概览\u003C\u002Fh2>\n\u003Cp>在 \u003Ccode>java.util.function\u003C\u002Fcode> 包中，Function 接口定义如下：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%40FunctionalInterface%0Apublic%20interface%20Function%3CT%2C%20R%3E%20%7B%0A%20%20%20%20R%20apply(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\">Function\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> \u003Cspan class=\"token class-name\">R\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">R\u003C\u002Fspan> \u003Cspan class=\"token function\">apply\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>R\u003C\u002Fcode> 表示返回结果的类型。\u003C\u002Fli>\n\u003Cli>\u003Ccode>apply(T t)\u003C\u002Fcode> 是 Function 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，并返回结果。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Function 接口是一个泛型接口，它可以接受不同类型的参数和返回不同类型的结果。\u003C\u002Fp>\n\u003Ch2 id=\"toc-1\">使用 Function 接口\u003C\u002Fh2>\n\u003Cp>接下来，让我们通过几个示例来说明如何使用 Function 接口。\u003C\u002Fp>\n\u003Ch3 id=\"toc-2\">示例 1：将字符串转换为大写\u003C\u002Fh3>\n\u003Cp>创建一个 Function 接口实例，将输入的字符串转换为大写形式。\u003C\u002Fp>\n\u003Cdiv class=\"language-javascript\" data-ext=\"javascript\" data-code=\"Function%3CString%2C%20String%3E%20toUpperCaseFunc%20%3D%20str%20-%3E%20str.toUpperCase()%3B%0AString%20input%20%3D%20%22hello%2C%20world!%22%3B%0AString%20result%20%3D%20toUpperCaseFunc.apply(input)%3B%0ASystem.out.println(result)%3B%20%2F%2F%20%E8%BE%93%E5%87%BA%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\">Function\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> String\u003Cspan class=\"token operator\">>\u003C\u002Fspan> toUpperCaseFunc \u003Cspan class=\"token operator\">=\u003C\u002Fspan> str \u003Cspan class=\"token operator\">-\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\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>\nString input \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token string\">\"hello, world!\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\nString result \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token function\">toUpperCaseFunc\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">apply\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>input\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\nSystem\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>result\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan> \u003Cspan class=\"token comment\">\u002F\u002F 输出 \"HELLO, WORLD!\"\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 Function 对象 \u003Ccode>toUpperCaseFunc\u003C\u002Fcode>，它将字符串转换为大写形式。我们调用 \u003Ccode>apply()\u003C\u002Fcode> 方法来执行函数，将输入的字符串 "hello, world!" 转换为大写形式并输出结果。\u003C\u002Fp>\n\u003Ch3 id=\"toc-3\">示例 2：计算字符串的长度\u003C\u002Fh3>\n\u003Cp>使用 Function 接口计算字符串的长度。\u003C\u002Fp>\n\u003Cdiv class=\"language-javascript\" data-ext=\"javascript\" data-code=\"Function%3CString%2C%20Integer%3E%20lengthFunc%20%3D%20str%20-%3E%20str.length()%3B%0AString%20input%20%3D%20%22Java%201.8%22%3B%0Aint%20length%20%3D%20lengthFunc.apply(input)%3B%0ASystem.out.println(%22Length%20of%20'%22%20%2B%20input%20%2B%20%22'%20is%3A%20%22%20%2B%20length)%3B%20%2F%2F%20%E8%BE%93%E5%87%BA%20%22Length%20of%20'Java%201.8'%20is%3A%207%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\">Function\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> Integer\u003Cspan class=\"token operator\">>\u003C\u002Fspan> lengthFunc \u003Cspan class=\"token operator\">=\u003C\u002Fspan> str \u003Cspan class=\"token operator\">-\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> str\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">length\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\nString input \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token string\">\"Java 1.8\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\nint length \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token function\">lengthFunc\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">apply\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>input\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\nSystem\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\">\"Length of '\"\u003C\u002Fspan> \u003Cspan class=\"token operator\">+\u003C\u002Fspan> input \u003Cspan class=\"token operator\">+\u003C\u002Fspan> \u003Cspan class=\"token string\">\"' is: \"\u003C\u002Fspan> \u003Cspan class=\"token operator\">+\u003C\u002Fspan> length\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan> \u003Cspan class=\"token comment\">\u002F\u002F 输出 \"Length of 'Java 1.8' is: 7\"\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 Function 对象 \u003Ccode>lengthFunc\u003C\u002Fcode>，它返回输入字符串的长度。我们调用 \u003Ccode>apply()\u003C\u002Fcode> 方法来执行函数，计算字符串 "Java 1.8" 的长度并输出结果。\u003C\u002Fp>\n\u003Ch3 id=\"toc-4\">示例 3：转换字符串为整数\u003C\u002Fh3>\n\u003Cp>使用 Function 接口将字符串转换为整数。\u003C\u002Fp>\n\u003Cdiv class=\"language-javascript\" data-ext=\"javascript\" data-code=\"Function%3CString%2C%20Integer%3E%20parseIntFunc%20%3D%20str%20-%3E%20Integer.parseInt(str)%3B%0AString%20input%20%3D%20%2212345%22%3B%0Aint%20number%20%3D%20parseIntFunc.apply(input)%3B%0ASystem.out.println(%22Parsed%20number%3A%20%22%20%2B%20number)%3B%20%2F%2F%20%E8%BE%93%E5%87%BA%20%22Parsed%20number%3A%2012345%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\">Function\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> Integer\u003Cspan class=\"token operator\">>\u003C\u002Fspan> parseIntFunc \u003Cspan class=\"token operator\">=\u003C\u002Fspan> str \u003Cspan class=\"token operator\">-\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> Integer\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">parseInt\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>str\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\nString input \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token string\">\"12345\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\nint number \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token function\">parseIntFunc\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">apply\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>input\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\nSystem\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\">\"Parsed number: \"\u003C\u002Fspan> \u003Cspan class=\"token operator\">+\u003C\u002Fspan> number\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan> \u003Cspan class=\"token comment\">\u002F\u002F 输出 \"Parsed number: 12345\"\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 Function 对象 \u003Ccode>parseIntFunc\u003C\u002Fcode>，它将字符串转换为整数。我们调用 \u003Ccode>apply()\u003C\u002Fcode> 方法来执行函数，将字符串 "12345" 转换为整数并输出结果。\u003C\u002Fp>\n\u003Ch2 id=\"toc-5\">Function 的组合\u003C\u002Fh2>\n\u003Cp>Function 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(Function after)\u003C\u002Fcode>: 返回一个先执行当前 Function 的 apply 方法，再执行 after Function 的 apply 方法的新 Function。\u003C\u002Fli>\n\u003Cli>\u003Ccode>compose(Function before)\u003C\u002Fcode>: 返回一个先执行 before Function 的 apply 方法，再执行当前 Function 的 apply 方法的新 Function。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>下面是一个组合示例：\u003C\u002Fp>\n\u003Cdiv class=\"language-sql\" data-ext=\"sql\" data-code=\"Function%3CString%2C%20Integer%3E%20parseToInt%20%3D%20str%20-%3E%20Integer.parseInt(str)%3B%0AFunction%3CInteger%2C%20Integer%3E%20square%20%3D%20num%20-%3E%20num%20*%20num%3B%0A%0AFunction%3CString%2C%20Integer%3E%20parseAndSquare%20%3D%20parseToInt.andThen(square)%3B%0A%0AString%20input%20%3D%20%225%22%3B%0Aint%20result%20%3D%20parseAndSquare.apply(input)%3B%0ASystem.out.println(%22Parsed%20and%20squared%20result%3A%20%22%20%2B%20result)%3B%20%2F%2F%20%E8%BE%93%E5%87%BA%20%22Parsed%20and%20squared%20result%3A%2025%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-sql\">\u003Cspan class=\"token keyword\">Function\u003C\u002Fspan>\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token keyword\">Integer\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> parseToInt \u003Cspan class=\"token operator\">=\u003C\u002Fspan> str \u003Cspan class=\"token operator\">-\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">Integer\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>parseInt\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>str\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\u003Cspan class=\"token keyword\">Function\u003C\u002Fspan>\u003Cspan class=\"token operator\"><\u003C\u002Fspan>\u003Cspan class=\"token keyword\">Integer\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token keyword\">Integer\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> square \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> num\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n\u003Cspan class=\"token keyword\">Function\u003C\u002Fspan>\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token keyword\">Integer\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> parseAndSquare \u003Cspan class=\"token operator\">=\u003C\u002Fspan> parseToInt\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>andThen\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>square\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\nString input \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token string\">\"5\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\u003Cspan class=\"token keyword\">int\u003C\u002Fspan> result \u003Cspan class=\"token operator\">=\u003C\u002Fspan> parseAndSquare\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token keyword\">apply\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>input\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\nSystem\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token keyword\">out\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>println\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"Parsed and squared result: \"\u003C\u002Fspan> \u003Cspan class=\"token operator\">+\u003C\u002Fspan> result\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan> \u003Cspan class=\"token comment\">\u002F\u002F 输出 \"Parsed and squared result: 25\"\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>在这个例子中，我们首先将字符串转换为整数，然后对整数进行平方运算，最终输出结果。\u003C\u002Fp>\n\u003Ch2 id=\"toc-6\">总结\u003C\u002Fh2>\n\u003Cp>Java 1.8 中的 Function 接口为函数式编程提供了强大的支持。通过使用 Function 接口，我们可以轻松地定义并执行接受一个参数并返回结果的操作。函数的组合使得函数式编程变得更加灵活和强大。\u003C\u002Fp>"]