{"id":2653,"date":"2024-03-25T17:22:59","date_gmt":"2024-03-25T08:22:59","guid":{"rendered":"https:\/\/technologyagency.net\/wordpress\/?p=2653"},"modified":"2024-03-25T17:23:01","modified_gmt":"2024-03-25T08:23:01","slug":"switch-expressions%e3%81%ab%e6%9b%b8%e3%81%8d%e6%8f%9b%e3%81%88%e3%82%8b","status":"publish","type":"post","link":"https:\/\/technologyagency.net\/wordpress\/2024\/03\/25\/switch-expressions%e3%81%ab%e6%9b%b8%e3%81%8d%e6%8f%9b%e3%81%88%e3%82%8b\/","title":{"rendered":"Switch Expressions\u306b\u66f8\u304d\u63db\u3048\u308b"},"content":{"rendered":"\n

\u3057\u3070\u3089\u304f\u653e\u7f6e\u3057\u3066\u3044\u305f\u304c\u3001Java 14\u304b\u3089\u6b63\u5f0f\u306b\u8ffd\u52a0\u3055\u308c\u305fSwitch Expressions\u3001Java 21\u304b\u3089\u8ffd\u52a0\u3055\u308c\u305fPattern Matching for switch\u3067\u65e2\u5b58\u306e\u51e6\u7406\u3092\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u306b\u3057\u305f\u3002<\/p>\n\n\n\n

Java 11\u304b\u308921\u307e\u3067\u306e\u9593\u306eSwitch\u6587\u306e\u5927\u304d\u306a\u5909\u66f4\u306f\uff12\u3064\u3042\u3063\u3066\u3001\u5206\u3051\u3066\u8003\u3048\u305f\u65b9\u304c\u308f\u304b\u308a\u3084\u3059\u3044\u3002<\/p>\n\n\n\n

Java 14\u3067\u8ffd\u52a0\u3055\u308c\u305fSwitch Expressions<\/h2>\n\n\n\n

\u3053\u308c\u306b\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u306e\u30e1\u30ea\u30c3\u30c8\u306f2\u3064\u3068\u8003\u3048\u3066\u3044\u308b\u3002<\/p>\n\n\n\n

\uff11\uff0ebreak\u304c\u4e0d\u8981<\/h3>\n\n\n\n

Switch\u6587\u304b\u3089\u629c\u3051\u308b\u305f\u3081\u306ebreak\u304c\u4e0d\u8981\u306b\u306a\u3063\u305f\u3002break\u304c\u306a\u304f\u3066\u3082\u540c\u3058\u3088\u3046\u306b\u6a5f\u80fd\u3059\u308b\u3002<\/p>\n\n\n\n

\u4f8b\uff09\u5909\u66f4\u524d<\/h5>\n\n\n\n
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switch<\/span> <\/span>(<\/span>code<\/span>)<\/span> <\/span>{<\/span><\/span>\ncase<\/span> <\/span>401<\/span>,<\/span> <\/span>403<\/span>:<\/span><\/span>\n    <\/span>model<\/span>.<\/span>addAttribute<\/span>(<\/span>"<\/span>errorTitle<\/span>"<\/span>,<\/span> <\/span>"<\/span>403<\/span>"<\/span>)<\/span>;<\/span><\/span>\n    <\/span>break;<\/span><\/span>\ncase<\/span> <\/span>404<\/span>:<\/span><\/span>\n    <\/span>model<\/span>.<\/span>addAttribute<\/span>(<\/span>"<\/span>errorTitle<\/span>"<\/span>,<\/span> <\/span>"<\/span>404<\/span>"<\/span>)<\/span>;<\/span><\/span>\n    <\/span>break;<\/span><\/span>\ndefault:<\/span><\/span>\n    <\/span>model<\/span>.<\/span>addAttribute<\/span>(<\/span>"<\/span>errorTitle<\/span>"<\/span>,<\/span> <\/span>"<\/span>error<\/span>"<\/span>)<\/span>;<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u5909\u66f4\u5f8c<\/h5>\n\n\n\n
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switch<\/span> <\/span>(<\/span>code<\/span>)<\/span> <\/span>{<\/span><\/span>\ncase<\/span> <\/span>401<\/span>,<\/span> <\/span>403<\/span> <\/span>-><\/span> <\/span>model<\/span>.<\/span>addAttribute<\/span>(<\/span>"<\/span>errorTitle<\/span>"<\/span>,<\/span> <\/span>"<\/span>403<\/span>"<\/span>)<\/span>;<\/span><\/span>\ncase<\/span> <\/span>404<\/span> <\/span>-><\/span> <\/span>model<\/span>.<\/span>addAttribute<\/span>(<\/span>"<\/span>errorTitle<\/span>"<\/span>,<\/span> <\/span>"<\/span>404<\/span>"<\/span>)<\/span>;<\/span><\/span>\ndefault<\/span> <\/span>-><\/span> <\/span>model<\/span>.<\/span>addAttribute<\/span>(<\/span>"<\/span>errorTitle<\/span>"<\/span>,<\/span> <\/span>"<\/span>error<\/span>"<\/span>)<\/span>;<\/span><\/span>\n}<\/span>;<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\uff12\uff0e\u7121\u99c4\u306a\u8a18\u8ff0\u304c\u6e1b\u308b<\/h3>\n\n\n\n
break\u304c\u4e0d\u8981\u306b\u306a\u3063\u305f\u3053\u3068\u3082\u542b\u3081\u3066\u3001\u7121\u99c4\u306a\u8a18\u8ff0\u3092\u6e1b\u3089\u305b\u308b\u3002<\/p>\n\n\n\n
\u4f8b\uff09\u5909\u66f4\u524d<\/h5>\n\n\n\n
<\/path><\/path><\/svg><\/span>
int<\/span> <\/span>multiple<\/span> <\/span>=<\/span> <\/span>0<\/span>;<\/span><\/span>\n<\/span>\nswitch<\/span> <\/span>(<\/span>unitSign<\/span>)<\/span> <\/span>{<\/span><\/span>\ncase<\/span> M_BYTE<\/span>:<\/span><\/span>\n    multiple <\/span>=<\/span> <\/span>1024<\/span> <\/span>*<\/span> <\/span>1024<\/span>;<\/span><\/span>\n    <\/span>break;<\/span><\/span>\ncase<\/span> K_BYTE<\/span>:<\/span><\/span>\n    multiple <\/span>=<\/span> <\/span>1024<\/span>;<\/span><\/span>\n    <\/span>break;<\/span><\/span>\ncase<\/span> BYTE<\/span>:<\/span><\/span>\n    multiple <\/span>=<\/span> <\/span>1<\/span>;<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u5909\u66f4\u5f8c<\/h5>\n\n\n\n
<\/path><\/path><\/svg><\/span>
int<\/span> <\/span>multiple<\/span> <\/span>=<\/span> <\/span>switch<\/span> <\/span>(<\/span>unitSign<\/span>)<\/span> <\/span>{<\/span><\/span>\ncase<\/span> M_BYTE <\/span>-><\/span> <\/span>1024<\/span> <\/span>*<\/span> <\/span>1024<\/span>;<\/span><\/span>\ncase<\/span> K_BYTE <\/span>-><\/span> <\/span>1024<\/span>;<\/span><\/span>\ncase<\/span> BYTE <\/span>-><\/span> <\/span>1<\/span>;<\/span><\/span>\n}<\/span>;<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
Java 21\u3067\u8ffd\u52a0\u3055\u308c\u305fPattern Matching for switch<\/h2>\n\n\n\n
\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u304c\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u304c\u3001\u6b63\u76f4\u3059\u3050\u4f7f\u3044\u305d\u3046\u306a\u306e\u306fnull\u306e\u30c1\u30a7\u30c3\u30af\u304f\u3089\u3044\u3060\u308d\u3046\u304b\u3002<\/p>\n\n\n\n
\u4f8b\uff09\u5909\u66f4\u524d<\/h5>\n\n\n\n
<\/path><\/path><\/svg><\/span>
public<\/span> <\/span>static<\/span> <\/span>FileConverter<\/span> <\/span>createConverter<\/span>(<\/span>FileType<\/span> fileType<\/span>)<\/span> <\/span>{<\/span><\/span>\n    <\/span>if<\/span> <\/span>(<\/span>fileType <\/span>==<\/span> <\/span>null<\/span>)<\/span> <\/span>{<\/span><\/span>\n        <\/span>throw<\/span> <\/span>new<\/span> <\/span>FileException<\/span>(<\/span>"<\/span>errors.fileType<\/span>"<\/span>)<\/span>;<\/span><\/span>\n    <\/span>}<\/span><\/span>\n<\/span>\n    <\/span>switch<\/span> <\/span>(<\/span>fileType<\/span>)<\/span> <\/span>{<\/span><\/span>\n    <\/span>case<\/span> XML<\/span>:<\/span><\/span>\n        <\/span>return<\/span> <\/span>createXmlConverter<\/span>()<\/span>;<\/span><\/span>\n    <\/span>case<\/span> EXCEL<\/span>:<\/span><\/span>\n        <\/span>return<\/span> <\/span>createExcelConverter<\/span>()<\/span>;<\/span><\/span>\n    <\/span>case<\/span> CSV<\/span>:<\/span><\/span>\n        <\/span>return<\/span> <\/span>createCsvConverter<\/span>()<\/span>;<\/span><\/span>\n    <\/span>default:<\/span><\/span>\n        <\/span>throw<\/span> <\/span>new<\/span> <\/span>FileException<\/span>(<\/span>"<\/span>errors.fileType<\/span>"<\/span>)<\/span>;<\/span><\/span>\n    <\/span>}<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u5909\u66f4\u5f8c<\/h5>\n\n\n\n
<\/path><\/path><\/svg><\/span>
public<\/span> <\/span>static<\/span> <\/span>FileConverter<\/span> <\/span>createConverter<\/span>(<\/span>FileType<\/span> fileType<\/span>)<\/span> <\/span>{<\/span><\/span>\n    <\/span>return<\/span> <\/span>switch<\/span> <\/span>(<\/span>fileType<\/span>)<\/span> <\/span>{<\/span><\/span>\n    <\/span>case<\/span> XML <\/span>-><\/span> <\/span>createXmlConverter<\/span>()<\/span>;<\/span><\/span>\n    <\/span>case<\/span> EXCEL <\/span>-><\/span> <\/span>createExcelConverter<\/span>()<\/span>;<\/span><\/span>\n    <\/span>case<\/span> CSV <\/span>-><\/span> <\/span>createCsvConverter<\/span>()<\/span>;<\/span><\/span>\n    <\/span>case<\/span> <\/span>null<\/span>,<\/span> <\/span>default<\/span> <\/span>-><\/span> <\/span>throw<\/span> <\/span>new<\/span> <\/span>FileException<\/span>(<\/span>"<\/span>errors.fileType<\/span>"<\/span>)<\/span>;<\/span><\/span>\n    <\/span>}<\/span>;<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"
\u3057\u3070\u3089\u304f\u653e\u7f6e\u3057\u3066\u3044\u305f\u304c\u3001Java 14\u304b\u3089\u6b63\u5f0f\u306b\u8ffd\u52a0\u3055\u308c\u305fSwitch Expressions\u3001Java 21\u304b\u3089\u8ffd\u52a0\u3055\u308c\u305fPattern Matching for switch\u3067\u65e2\u5b58\u306e\u51e6\u7406\u3092\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u306b\u3057\u305f\u3002 Ja … “Switch Expressions\u306b\u66f8\u304d\u63db\u3048\u308b” \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-2653","post","type-post","status-publish","format-standard","hentry","category-java"],"yoast_head":"\nSwitch Expressions\u306b\u66f8\u304d\u63db\u3048\u308b - I want to lead an easy life.<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/technologyagency.net\/wordpress\/2024\/03\/25\/switch-expressions\u306b\u66f8\u304d\u63db\u3048\u308b\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Switch Expressions\u306b\u66f8\u304d\u63db\u3048\u308b - 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