{"id":2045,"date":"2023-01-20T23:09:25","date_gmt":"2023-01-20T14:09:25","guid":{"rendered":"https:\/\/technologyagency.net\/wordpress\/?p=2045"},"modified":"2023-01-20T23:14:20","modified_gmt":"2023-01-20T14:14:20","slug":"java-8%e3%81%aeoptional%e3%82%af%e3%83%a9%e3%82%b9%e3%81%ae%e8%80%83%e5%af%9f","status":"publish","type":"post","link":"https:\/\/technologyagency.net\/wordpress\/2023\/01\/20\/java-8%e3%81%aeoptional%e3%82%af%e3%83%a9%e3%82%b9%e3%81%ae%e8%80%83%e5%af%9f\/","title":{"rendered":"Java 8\u306eOptional\u30af\u30e9\u30b9\u306e\u8003\u5bdf"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u52d5\u6a5f<\/h2>\n\n\n\n<p>Optional\u306b\u3064\u3044\u3066\u3001\u3046\u307e\u304f\u4f7f\u3048\u3066\u3044\u306a\u3044\u6c17\u304c\u3059\u308b\u305f\u3081\u3001\u6539\u3081\u3066\u6574\u7406\u3057\u3066\u307f\u308b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5b9f\u88c5\u4f8b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Null\u30c1\u30a7\u30c3\u30af<\/h3>\n\n\n\n<p>null\u306e\u4e00\u756a\u306e\u554f\u984c\u70b9\u306f\u3001null\u30c1\u30a7\u30c3\u30af\u3092\u884c\u308f\u306a\u304f\u3068\u3082\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u3089\u306a\u3044\u3053\u3068\u3002\u305d\u3057\u3066\u5b9f\u884c\u6642\u306bNullPointerException\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3053\u3068\u3002<\/p>\n\n\n\n<p>\u4f8b\u3068\u3057\u3066\u3001null\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046\u5834\u5408\u306b\u3064\u3044\u3066\u8003\u3048\u3066\u307f\u308b\u3002<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: java; title: ; notranslate\" title=\"\">\npublic String getFruit() {\n    return \u679c\u7269\u306e\u540d\u524d\u307e\u305f\u306f\u3001null\u3092\u8fd4\u5374\u3059\u308b\u51e6\u7406\u3068\u3059\u308b;\n}\n\npublic void fruitCheck() {\n    var fruit = getFruit();\n\n    if (fruit != null) {\n        System.out.println(fruit + &quot; are delicious.&quot;);            \n    }\n}\n<\/pre><\/div>\n\n\n<p>\u3053\u308c\u3092\u5358\u7d14\u306bOptional\u306b\u7f6e\u304d\u63db\u3048\u308b\u3068\u4e0b\u8a18\u306e\u3088\u3046\u306b\u306a\u308b\u3002<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: java; title: ; notranslate\" title=\"\">\npublic Optional&lt;String&gt; getFruit() {\n    String name = \u679c\u7269\u306e\u540d\u524d\u307e\u305f\u306f\u3001null\u3092\u8fd4\u5374\u3059\u308b\u51e6\u7406\u3068\u3059\u308b;\n    return Optional.ofNullable(name);\n}\n\npublic void fruitCheck() {\n    var fruit = getFruit();\n\n    if (fruit.isPresent()) {\n        System.out.println(fruit.get() + &quot; are delicious.&quot;);\n    }\n}\n<\/pre><\/div>\n\n\n<p>\u3053\u308c\u3060\u3068\u3001null\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3063\u3066\u3044\u308b\u3068\u304d\u3068\u5909\u308f\u3089\u306a\u3044\u3002\u3053\u306e\u51e6\u7406\u3092\u5178\u578b\u7684\u306a\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u30b9\u30bf\u30a4\u30eb\u306b\u66f8\u304d\u63db\u3048\u3066\u307f\u308b\u3002<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: java; title: ; notranslate\" title=\"\">\npublic void fruitCheck() {\n    var fruit = getFruit();\n\n    fruit.ifPresent(name -&gt; System.out.println(name + &quot; are delicious.&quot;));\n}\n<\/pre><\/div>\n\n\n<p>else\u306e\u51e6\u7406\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001\u4e0b\u8a18\u306e\u3088\u3046\u306b\u66f8\u3051\u308b\u3002<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: java; title: ; notranslate\" title=\"\">\nfruit.ifPresentOrElse(name -&gt; System.out.println(name + &quot; are delicious.&quot;),\n        () -&gt; System.out.println(&quot;I&#039;m hungry.&quot;));\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">Null\u306e\u5834\u5408\u306b\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u51e6\u7406<\/h3>\n\n\n\n<p>getFruit()\u306e\u30e1\u30bd\u30c3\u30c9\u3067null\u3092\u8fd4\u3059\u306e\u3067\u306f\u306a\u304f\u3001null\u306e\u5834\u5408\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u5024\u3092\u8fd4\u3059\u5834\u5408\u3092\u8003\u3048\u3066\u307f\u308b\u3002<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: java; title: ; notranslate\" title=\"\">\npublic String getFruit() {\n    String name = \u679c\u7269\u306e\u540d\u524d\u307e\u305f\u306f\u3001null\u3092\u8fd4\u5374\u3059\u308b\u51e6\u7406\u3068\u3059\u308b;\n\n    if (name != null) {\n        return name;\n    } else {\n        return &quot;Apple&quot;;\n    }\n}\n\npublic void fruitCheck() {\n    var fruit = getFruit();\n\n    System.out.println(fruit + &quot; are delicious.&quot;);            \n}\n<\/pre><\/div>\n\n\n<p>Optional\u306b\u7f6e\u304d\u63db\u3048\u308b\u3068\u4e0b\u8a18\u306e\u3088\u3046\u306b\u306a\u308b\u3002<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: java; title: ; notranslate\" title=\"\">\npublic String getFruit() {\n    String name = \u679c\u7269\u306e\u540d\u524d\u307e\u305f\u306f\u3001null\u3092\u8fd4\u5374\u3059\u308b\u51e6\u7406\u3068\u3059\u308b;\n\n    return Optional.ofNullable(name).orElse(&quot;Apple&quot;);\n}\n<\/pre><\/div>\n\n\n<p>\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u30b9\u30bf\u30a4\u30eb\u306b\u306a\u3063\u3066\u3001Null\u30c1\u30a7\u30c3\u30af\u306e\u30df\u30b9\u3082\u6e1b\u308b\u3060\u308d\u3046\u304b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Null\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3068\u3068\u3082\u306b\u5024\u306e\u30c1\u30a7\u30c3\u30af\u3082\u884c\u3046\u5834\u5408<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: java; title: ; notranslate\" title=\"\">\npublic void fruitCheck() {\n    var fruit = getFruit();\n\n    if (fruit != null &amp;&amp; fruit.equals(&quot;Banana&quot;)) {\n        System.out.println(fruit + &quot; are very delicious.&quot;);            \n    }\n}\n<\/pre><\/div>\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: java; title: ; notranslate\" title=\"\">\npublic void fruitCheck() {\n    var fruit = getFruit();\n\n    fruit.filter(name -&gt; name.equals(&quot;Banana&quot;))\n            .ifPresent(name -&gt; System.out.println(name + &quot; are delicious.&quot;));\n}\n<\/pre><\/div>","protected":false},"excerpt":{"rendered":"<p>\u52d5\u6a5f Optional\u306b\u3064\u3044\u3066\u3001\u3046\u307e\u304f\u4f7f\u3048\u3066\u3044\u306a\u3044\u6c17\u304c\u3059\u308b\u305f\u3081\u3001\u6539\u3081\u3066\u6574\u7406\u3057\u3066\u307f\u308b\u3002 \u5b9f\u88c5\u4f8b Null\u30c1\u30a7\u30c3\u30af null\u306e\u4e00\u756a\u306e\u554f\u984c\u70b9\u306f\u3001null\u30c1\u30a7\u30c3\u30af\u3092\u884c\u308f\u306a\u304f\u3068\u3082\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u3089\u306a\u3044\u3053\u3068\u3002\u305d\u3057\u3066\u5b9f\u884c\u6642\u306bNul &hellip; <a href=\"https:\/\/technologyagency.net\/wordpress\/2023\/01\/20\/java-8%e3%81%aeoptional%e3%82%af%e3%83%a9%e3%82%b9%e3%81%ae%e8%80%83%e5%af%9f\/\" class=\"more-link\"><span class=\"screen-reader-text\">&#8220;Java 8\u306eOptional\u30af\u30e9\u30b9\u306e\u8003\u5bdf&#8221; \u306e<\/span>\u7d9a\u304d\u3092\u8aad\u3080<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-2045","post","type-post","status-publish","format-standard","hentry","category-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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null\u306e\u4e00\u756a\u306e\u554f\u984c\u70b9\u306f\u3001null\u30c1\u30a7\u30c3\u30af\u3092\u884c\u308f\u306a\u304f\u3068\u3082\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u3089\u306a\u3044\u3053\u3068\u3002\u305d\u3057\u3066\u5b9f\u884c\u6642\u306bNul &hellip; &quot;Java 8\u306eOptional\u30af\u30e9\u30b9\u306e\u8003\u5bdf&quot; \u306e\u7d9a\u304d\u3092\u8aad\u3080\" \/>\n<meta property=\"og:url\" content=\"https:\/\/technologyagency.net\/wordpress\/2023\/01\/20\/java-8\u306eoptional\u30af\u30e9\u30b9\u306e\u8003\u5bdf\/\" \/>\n<meta property=\"og:site_name\" content=\"I want to lead an easy life.\" \/>\n<meta property=\"article:published_time\" content=\"2023-01-20T14:09:25+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-01-20T14:14:20+00:00\" \/>\n<meta name=\"author\" content=\"hide6644\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta 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