{"id":5138,"date":"2020-12-27T20:36:42","date_gmt":"2020-12-27T12:36:42","guid":{"rendered":"https:\/\/www.xttblog.com\/?p=5138"},"modified":"2020-12-27T20:36:42","modified_gmt":"2020-12-27T12:36:42","slug":"%e4%bb%8ejava-io-notserializableexception%ef%bc%9ajava-util-optional%e5%bc%82%e5%b8%b8%e8%af%b4optional-%e4%b8%8d%e5%8f%af%e5%ba%8f%e5%88%97%e5%8c%96","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=5138","title":{"rendered":"\u4ecejava.io.NotSerializableException\uff1ajava.util.Optional\u5f02\u5e38\u8bf4Optional \u4e0d\u53ef\u5e8f\u5217\u5316"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u9762\u8bd5\u5b98\uff1aJava Optional \u4e3a\u4ec0\u4e48\u8bbe\u8ba1\u6210\u4e0d\u53ef\u5e8f\u5217\u5316\u7684\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Optional \u81ea Java8 \u53d1\u5e03\u4ee5\u6765\u6df1\u53d7\u559c\u7231\u3002\u5f88\u591a\u4eba\u8ba4\u4e3a\u5b83\u662f\u6765\u89e3\u51b3\u201c\u7a7a\u201d\u5f02\u5e38\u95ee\u9898\u7684\uff0c\u5176\u5b9e\u5b83\u5e76\u4e0d\u80fd\u89e3\u51b3\u7a7a\u5f02\u5e38\uff0c\u5b83\u53ea\u662f\u4e00\u4e2a\u5bb9\u5668\uff0c\u8fd9\u4e2a\u5bb9\u5668\u5185\u7684\u5bf9\u8c61\u53ef\u80fd\u4e3a\u7a7a\uff0c\u9700\u8981\u4f7f\u7528\u8005\u81ea\u884c\u5224\u65ad\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Optional \u63d0\u4f9b\u7684\u53ea\u662f\u4e00\u79cd\u601d\u60f3\uff0c\u5f88\u591a\u7a0b\u5e8f\u5458\u4e0d\u660e\u5176\u610f\uff0c\u4ee3\u7801\u4e2d\u5b58\u5728\u4e0d\u5c11\u4e71\u7528\u7684\u60c5\u51b5\uff0c\u5c24\u5176\u662f\u4e2d\u56fd\u7a0b\u5e8f\u5458\u3002\u4ee5\u81f3\u4e8e\uff0c\u6211\u5728\u9762\u8bd5\u5019\u9009\u4eba\u7684\u65f6\u5019\uff0c\u95ee\u5230\u201cJava Optional \u4e3a\u4ec0\u4e48\u8bbe\u8ba1\u6210\u4e0d\u53ef\u5e8f\u5217\u5316\u7684\uff1f\u201d\u51e0\u4e4e\u6ca1\u6709\u4eba\u80fd\u56de\u7b54\u5230\u70b9\u5b50\u4e0a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8eab\u8fb9\u4e0d\u5c11\u7684\u540c\u4e8b\u4e5f\u4ec5\u4ec5\u662f\u505c\u7559\u5728\u4f7f\u7528\u4e0a\uff0c\u5982\u679c\u7a0d\u5fae\u95ee\u4ed6\u4eec\u51e0\u4e2a\u95ee\u9898\uff0c\u5c31\u4f1a\u5f97\u5230\u201c\u4e0d\u77e5\u9053\uff0c\u5927\u5bb6\u90fd\u8fd9\u4e48\u7528\uff0c\u6211\u548c\u522b\u4eba\u7684\u7528\u6cd5\u4e00\u6837\u201d\u7b49\u7b49\u7c7b\u4f3c\u7684\u7b54\u6848\u3002\u66f4\u6709\u751a\u8005\uff0c\u628a\u5b9e\u4f53\u7c7b\u4e2d\u7684\u6240\u6709\u5c5e\u6027\u90fd\u7528\u4e0a Optional\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.*;\nimport java.util.Optional;\n\npublic class XttblogTest implements Serializable {\n    private Optional&lt;String&gt; name;\n    private Integer age;\n \n    public Optional&lt;String&gt; getName() {\n        return name;\n    }\n \n    public void setName(Optional&lt;String&gt; name) {\n        this.name = name;\n    }\n \n    public Integer getAge() {\n        return age;\n    }\n \n    public void setAge(Integer age) {\n        this.age = age;\n    }\n \n    public static void main(String[] args) throws Exception {\n        XttblogTest test = new XttblogTest();\n        test.setName(Optional.of(\"\u4e1a\u4f59\u8349\"));\n        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(\"data\"));\n        \/\/\u5e8f\u5217\u5316\u65f6name\u5b57\u6bb5\u662fOptional\u7c7b\u578b\uff0c\u4e0d\u652f\u6301\u5e8f\u5217\u5316\uff0c\u62a5\u5982\u4e0b\u5f02\u5e38\uff1a\n        \/\/Exception in thread \"main\" java.io.NotSerializableException: java.util.Optional\n        out.writeObject(test);\n \n        ObjectInputStream in = new ObjectInputStream(new FileInputStream(\"data\"));\n        XttblogTest obj = (XttblogTest) in.readObject();\n        Optional&lt;String&gt; name = obj.getName();\n        Integer age = obj.getAge();\n        System.out.println(name);\n        System.out.println(age);\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e73\u65f6\u8fd9\u6837\u4f7f\u7528\u4e00\u70b9\u95ee\u9898\u4e5f\u6ca1\u6709\uff0c\u4f46\u662f\u5f53\u9047\u5230\u5e8f\u5217\u5316\u65f6\uff0c\u5c31\u4f1a\u66dd\u51fa<code>Exception in thread \"main\" java.io.NotSerializableException: java.util.Optional<\/code>\u5f02\u5e38\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u6837\u7684\u95ee\u9898\uff0c\u6211\u5728 Code Review \u65f6\u518d\u4e09\u5f3a\u8c03\uff0c\u8fd8\u603b\u662f\u6709\u4eba\u613f\u505a\u201c\u51fa\u5934\u9e1f\u201d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4e00\u5b9a\u8981\u4f7f\u7528 Optional\uff0c\u6216\u8005\u7ebf\u4e0a\u7684\u4ee3\u7801\u5df2\u7ecf\u88ab\u5176\u4ed6\u4eba\u591a\u6b21\u8c03\u7528\u4e86\uff0c\u53ef\u4ee5\u628a\u5c5e\u6027\u4e0a\u7684 Optional \u53bb\u6389\uff0cget \u65b9\u6cd5\u4e0a\u4fdd\u7559\u3002\u8fd9\u6837\u5c31\u53ef\u4ee5\u7ee7\u7eed\u5e8f\u5217\u5316\u4e86\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.*;\nimport java.util.Optional;\n\npublic class CodedqTest implements Serializable {\n    private String name;\n    private Integer age;\n \n    public Optional&lt;String&gt; getName(){\n        return Optional.ofNullable(this.name);\n    }\n \n    public void setName(String name) {\n        this.name = name;\n    }\n \n    public Integer getAge() {\n        return age;\n    }\n \n    public void setAge(Integer age) {\n        this.age = age;\n    }\n \n    public static void main(String[] args) throws Exception {\n        CodedqTest test = new CodedqTest();\n        test.setName(\"\u4e1a\u4f59\u8349\");\n        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(\"data\"));\n        out.writeObject(test);\n \n        ObjectInputStream in = new ObjectInputStream(new FileInputStream(\"data\"));\n        CodedqTest obj = (CodedqTest) in.readObject();\n        Optional&lt;String&gt; name = obj.getName();\n        Integer age = obj.getAge();\n        System.out.println(name);\/\/Optional[\u4e1a\u4f59\u8349]\n        System.out.println(age);\/\/null\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u7136\u6700\u597d\u7684\u505a\u6cd5\u662f\uff0c\u4e0d\u5728\u5b9e\u4f53\u7c7b\u4e2d\u4f7f\u7528 Optional\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u4e3a\uff0cJava \u5b98\u65b9\u6839\u672c\u5c31\u4e0d\u63a8\u8350 Optional \u7528\u5728\u5b9e\u4f53\u5c5e\u6027\u4e0a\uff0c\u8fd9\u4e5f\u662f Java \u8bbe\u8ba1\u51fa NotSerializableException \u5f02\u5e38\u7684\u539f\u56e0\u4e4b\u4e00\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Optional \u63a8\u8350\u7684\u7528\u6cd5\u662f\u5728\u51fd\u6570\u8fd4\u56de\u503c\u4e0a\u3002\u544a\u8bc9\u51fd\u6570\u8c03\u7528\u8005\uff0c\u8fd4\u56de\u7684\u5bf9\u8c61\u5b58\u5728\u7a7a\u5f02\u5e38\u7684\u53ef\u80fd\uff0c\u9700\u8981\u8c03\u7528\u8005\u81ea\u884c\u5904\u7406\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5177\u4f53 Optional \u7684\u7528\u6cd5\uff0c\u4e0d\u662f\u672c\u6587\u91cd\u70b9\uff0c\u611f\u5174\u8da3\u7684\u53ef\u4ee5\u6536\u85cf\u4e0b\u56fe\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/gitee.com\/xmtblog\/img\/raw\/master\/2020\/op_java.png\" alt=\"\" \/><figcaption>Optional \u6559\u7a0b<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u56de\u5230\u4e3b\u9898\uff0cJava \u5728\u8bbe\u8ba1 Optional \u4e4b\u521d\u5c31\u628a\u5b83\u8bbe\u8ba1\u4e3a\u4e0d\u53ef\u5e8f\u5217\u5316\u7684\u3002\u5177\u4f53\u53ef\u4ee5\u53c2\u89c1 Java Lambda\uff08JSR-335\uff09\u4e13\u5bb6\u7ec4\u7684\u8ba8\u8bba<code>http:\/\/mail.openjdk.java.net\/pipermail\/jdk8-dev\/2013-September\/003274.html<\/code>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u9009\u62e9\u4e86\u4e00\u4e9b\u5185\u5bb9\uff0c\u4f9b\u5927\u5bb6\u53c2\u8003\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9996\u5148\uff0c\u5b98\u65b9\u63a8\u8350\u7684\u662f\u5728\u51fd\u6570\u8fd4\u56de\u503c\u7684\u4f4d\u7f6e\u4e0a\u4f7f\u7528 Optional\uff0c\u800c\u4e0d\u662f\u5c5e\u6027\uff0c\u96c6\u5408\u7b49\u4f4d\u7f6e\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Map&lt;Optional&lt;List&lt;String&gt;&gt;&gt;\nList&lt;Optional&lt;Map&lt;String&gt;&gt;&gt;\nList&lt;Optional&lt;String &gt;&gt;&gt;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5176\u6b21\uff0cOptional \u4f5c\u4e3a\u4e00\u4e2a\u5305\u88c5\u7c7b\uff0c\u5927\u91cf\u7684 Optional \u4f1a\u6d88\u8017\u8fc7\u591a\u7684\u5185\u5b58\u3002Optional \u5728\u5b57\u6bb5\u4e2d\u4f7f\u7528\u53ef\u80fd\u4f1a\u6d6a\u8d39\u5185\u5b58\uff0c\u5e76\u51cf\u6162\u6570\u636e\u7ed3\u6784\u7684\u904d\u5386\u901f\u5ea6\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b2c\u4e09\uff0c\u5b98\u65b9\u4e5f\u4e0d\u63a8\u8350\u5728\u5e8f\u5217\u5316\u3001\u6c38\u4e45\u5b58\u50a8\u6216\u901a\u8fc7\u7f51\u7edc\u4f20\u8f93\u4e2d\u4f7f\u7528 Optional\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b2c\u56db\uff0c\u5728\u65b9\u6cd5\u7684\u53c2\u6570\u4e2d\uff0c\u4e5f\u4e0d\u63a8\u8350\u4f7f\u7528 Optional\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public Foo doSomething(String id, Optional&lt;String&gt; barOptional);\n\n\/\/ \u8c03\u7528\u65b9\u6cd5\nfoo(\"\u4e1a\u4f59\u8349\", Optional.of(\"baz\"));\nfoo(\"\u4e1a\u4f59\u8349\", Optional.empty());<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6700\u597d\u7684\u529e\u6cd5\u662f\u62e5\u6709\u4e00\u4e2a\u91cd\u8f7d\u7684\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u63a5\u53d7\u5355\u4e2a\u5b57\u7b26\u4e32\u53c2\u6570\u5e76\u4e3a\u7b2c\u4e8c\u4e2a\u63d0\u4f9b\u9ed8\u8ba4\u503c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>foo(\"\u4e1a\u4f59\u8349\", \"baz\");\nfoo(\"\u4e1a\u4f59\u8349\");<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b2c\u4e94\uff0c\u5b98\u65b9\u63a8\u8350\u901a\u8fc7\u5728 Stream \u6d41\u7ba1\u9053\uff08\u6216\u5176\u4ed6\u65b9\u6cd5\uff09\u8fd4\u56de Optional\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Optional \u7684\u8bbe\u8ba1\u521d\u8877\u5728\u4e8e\uff0c\u6d88\u9664\u201cnull\u201d\u800c\u63d0\u9ad8\u53ef\u8bfb\u6027\uff0cOptional \u7684\u6700\u5927\u4f18\u70b9\u662f\u5176\u201c\u9632\u767d\u75f4\u201d\u3002\u5982\u679c\u4f60\u8c03\u7528\u4e86\u4e00\u4e2a\u8fd4\u56de\u503c\u4e3a Optional \u7684 API\uff0c\u5b83\u4f1a\u8feb\u4f7f\u60a8\u79ef\u6781\u8003\u8651\u4e0d\u5b58\u5728\u7684\u60c5\u51b5\uff0c\u4f60\u5fc5\u987b\u4e3b\u52a8\u7684\u5c55\u5f00 Optional \u5e76\u89e3\u51b3\u8be5\u60c5\u51b5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Optional \u7684\u51fa\u73b0\u5e76\u4e0d\u662f\u4e3a\u4e86\u66ff\u4ee3 null\uff0c\u800c\u662f\u7528\u6765\u8868\u793a\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684\u5bb9\u5668\uff0c\u5b83\u53ef\u4ee5\u5305\u542b\u4e00\u4e2a\u975e null \u7684 T \u5f15\u7528\uff0c\u4e5f\u53ef\u4ee5\u4ec0\u4e48\u90fd\u4e0d\u5305\u542b(\u4e0d\u5305\u542b\u4e0d\u7b49\u4e8e null)\uff0c\u975e\u7a7a\u7684\u5305\u542b\u88ab\u79f0\u4f5c persent\uff0c\u800c\u7a7a\u5219\u88ab\u79f0\u4f5c absent\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u8d28\u4e0a\u8bb2 Optional \u7c7b\u4f3c\u4e8e\u5f02\u5e38\u68c0\u67e5\uff0c\u5b83\u8feb\u4f7f API \u7528\u6237\u53bb\u5173\u6ce8\/\u5904\u7406 Optional \u4e2d\u662f\u5426\u5305\u542b\u5185\u5bb9\uff0c\u4ece\u800c\u907f\u514d\u56e0\u4e3a\u5ffd\u7565 null \u503c\u68c0\u67e5\u800c\u5bfc\u81f4\u7684\u4e00\u4e9b\u6f5c\u5728\u9690\u60a3\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u540e\uff0c\u5728\u5e8f\u5217\u5316\u65b9\u9762\u3002JDK \u7684\u5e8f\u5217\u5316\u6bd4\u8f83\u7279\u6b8a\uff0c\u9700\u8981\u540c\u65f6\u5411\u524d\u53ca\u5411\u540e\u517c\u5bb9\uff0c\u5982\u5728 JDK7 \u4e2d\u5e8f\u5217\u5316\u7684\u5bf9\u8c61\u9700\u8981\u80fd\u591f\u5728 JDK8 \u4e2d\u53cd\u5e8f\u5217\u5316\uff0c\u540c\u6837\u5728 JDK8 \u4e2d\u5e8f\u5217\u5316\u7684\u5bf9\u8c61\u9700\u8981\u80fd\u591f\u5728 JDK7 \u4e2d\u80fd\u591f\u53cd\u5e8f\u5217\u5316\uff1b\u5176\u6b21\uff0c\u5e8f\u5217\u5316\u9700\u8981\u4f9d\u8d56\u4e8e\u5bf9\u8c61\u7684 identity\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6709\u4e86\u4ee5\u4e0a\u4e24\u4e2a\u5e8f\u5217\u5316\u7684\u524d\u63d0\u6761\u4ef6\uff0c\u518d\u7ed3\u5408 Optional \u76ee\u524d\u662f reference type \u7684\uff0c\u4f46\u5176\u88ab\u6807\u8bb0\u4e3a value based class\uff0c\u5176\u6709\u8ba1\u5212\u5728\u4eca\u540e\u7684\u67d0\u4e00\u4e2a JDK \u7248\u672c\u4e2d\u5c06\u5176\u5b9e\u73b0\u4e3a value type\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c Optional \u8bbe\u8ba1\u4e3a\u5e8f\u5217\u5316\u7684\uff0c\u90a3\u73b0\u5728\u5c31\u6709\u4e24\u4e2a\u77db\u76fe\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5982\u679c Optional \u53ef\u4ee5\u5e8f\u5217\u5316\uff0c\u90a3\u5c31\u6ca1\u529e\u6cd5\u5c06 Optional \u5b9e\u73b0\u4e3a value type\uff0c\u800c\u5fc5\u987b\u662f reference type<\/li><li>\u6216\u8005\u5c06 value type \u52a0\u5165 identity-sensitive operations\uff0c\u8fd9\u5bf9\u4e8e\u76ee\u524d\u6240\u6709\u5df2\u53d1\u884c\u7684 JDK \u7248\u672c\u90fd\u662f\u76f8\u51b2\u7a81\u7684<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\uff0c\u867d\u7136\u73b0\u5728 Optional \u662f reference type\uff0c\u4f46\u6709\u8ba1\u5212\u5c06\u5176\u5b9e\u73b0\u4e3a value type\uff0c\u8003\u8651\u5230 JDK \u5e8f\u5217\u5316\u7684\u5411\u524d\u53ca\u5411\u540e\u517c\u5bb9\u6027\uff0c\u4ece\u4e00\u5f00\u59cb\u5c31\u5c06 Optional \u5b9a\u4e3a\u4e0d\u53ef\u5e8f\u5217\u5316\uff0c\u5e94\u8be5\u662f\u6700\u5408\u9002\u7684\u65b9\u6848\u4e86\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u53c2\u8003\u8d44\u6599<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><a rel=\"noreferrer noopener\" aria-label=\"\uff08\u5728\u65b0\u7a97\u53e3\u6253\u5f00\uff09\" href=\"https:\/\/blog.joda.org\/2015\/08\/java-se-8-optional-pragmatic-approach.html\" target=\"_blank\">Optional Pragmatic Approach<\/a><\/li><li><a rel=\"noreferrer noopener\" aria-label=\"\uff08\u5728\u65b0\u7a97\u53e3\u6253\u5f00\uff09\" href=\"https:\/\/homes.cs.washington.edu\/~mernst\/advice\/nothing-is-better-than-optional.html\" target=\"_blank\">Nothing is better than the\u00a0<\/a><code><a rel=\"noreferrer noopener\" aria-label=\"\uff08\u5728\u65b0\u7a97\u53e3\u6253\u5f00\uff09\" href=\"https:\/\/homes.cs.washington.edu\/~mernst\/advice\/nothing-is-better-than-optional.html\" target=\"_blank\">Optional<\/a><\/code><a rel=\"noreferrer noopener\" aria-label=\"\uff08\u5728\u65b0\u7a97\u53e3\u6253\u5f00\uff09\" href=\"https:\/\/homes.cs.washington.edu\/~mernst\/advice\/nothing-is-better-than-optional.html\" target=\"_blank\">\u00a0type<\/a><\/li><li><a rel=\"noreferrer noopener\" aria-label=\"https:\/\/stackoverflow.com\/questions\/23454952\/uses-for-optional\/23464794#23464794\uff08\u5728\u65b0\u7a97\u53e3\u6253\u5f00\uff09\" href=\"https:\/\/stackoverflow.com\/questions\/23454952\/uses-for-optional\/23464794#23464794\" target=\"_blank\">https:\/\/stackoverflow.com\/questions\/23454952\/uses-for-optional\/23464794#23464794<\/a><\/li><li><a rel=\"noreferrer noopener\" aria-label=\"http:\/\/mail.openjdk.java.net\/pipermail\/lambda-libs-spec-experts\/2013-May\/001814.html\uff08\u5728\u65b0\u7a97\u53e3\u6253\u5f00\uff09\" href=\"http:\/\/mail.openjdk.java.net\/pipermail\/lambda-libs-spec-experts\/2013-May\/001814.html\" target=\"_blank\">http:\/\/mail.openjdk.java.net\/pipermail\/lambda-libs-spec-experts\/2013-May\/001814.html<\/a><\/li><li><a href=\"http:\/\/mail.openjdk.java.net\/pipermail\/jdk8-dev\/2013-September\/003274.html\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"http:\/\/mail.openjdk.java.net\/pipermail\/jdk8-dev\/2013-September\/003274.html\uff08\u5728\u65b0\u7a97\u53e3\u6253\u5f00\uff09\">http:\/\/mail.openjdk.java.net\/pipermail\/jdk8-dev\/2013-September\/003274.html<\/a><\/li><\/ul>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img decoding=\"async\" src=\"https:\/\/raw.githubusercontent.com\/xmt1139057136\/xttblog\/master\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/>--><img decoding=\"async\" src=\"https:\/\/saas.51autoparts.cn\/api\/admin\/sys-file\/oss\/file?fileName=84db51f8561e448f9a4fda2eff0811f9.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/><\/p><p>\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01<b>\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1a<font color=\"red\">xttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p><p>\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a<a href=\"https:\/\/www.xttblog.com\">\u4e1a\u4f59\u8349<\/a>\uff1a &raquo; <a href=\"https:\/\/www.xttblog.com\/?p=5138\">\u4ecejava.io.NotSerializableException\uff1ajava.util.Optional\u5f02\u5e38\u8bf4Optional \u4e0d\u53ef\u5e8f\u5217\u5316<\/a><\/p><!-- <div class=\"bd-reward-stl\"><button id=\"bdRewardBtn\"><span><\/span><\/button><\/div> -->","protected":false},"excerpt":{"rendered":"<p>\u9762\u8bd5\u5b98\uff1aJava Optional \u4e3a\u4ec0\u4e48\u8bbe\u8ba1\u6210\u4e0d\u53ef\u5e8f\u5217\u5316\u7684\uff1f Optional \u81ea Java8 \u53d1\u5e03\u4ee5\u6765\u6df1\u53d7 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[1471,71,1621,1793,367],"class_list":["post-5138","post","type-post","status-publish","format-standard","hentry","category-java","tag-optional","tag-outputstream","tag-stream","tag-tokenstream","tag-xstream"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/5138","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5138"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/5138\/revisions"}],"predecessor-version":[{"id":5139,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/5138\/revisions\/5139"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5138"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5138"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5138"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}