{"id":2377,"date":"2022-01-17T10:41:07","date_gmt":"2022-01-17T01:41:07","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=2377"},"modified":"2026-05-22T20:00:45","modified_gmt":"2026-05-22T11:00:45","slug":"kotlin0001","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/kotlin0001\/","title":{"rendered":"Kotlin\u3068\u306f\uff1f\u4eca\u6ce8\u76ee\u3055\u308c\u308bAndroid\u30a2\u30d7\u30ea\u958b\u767a\u8a00\u8a9e\u3092\u5fb9\u5e95\u89e3\u8aac"},"content":{"rendered":"\n<h2 id=\"outline__1\" class=\"wp-block-heading\">Kotlin\u3068\u306f\uff1f<\/h2>\n\n\n\n<img decoding=\"async\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/20220106\/iStock-1327923214.jpg\" class=\"post-img\">\n\n\n\n<p class=\"wp-block-paragraph\">Kotlin\u306f2011\u5e74\u306bJetBrains\u793e\u306b\u3088\u3063\u3066\u958b\u767a\u3055\u308c\u305fJVM\uff08Java\u4eee\u60f3\u30de\u30b7\u30f3\uff09\u4e0a\u3067\u52d5\u4f5c\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3059\u3002\u73fe\u5728\u4eba\u6c17\u306e\u3042\u308b\u8a00\u8a9e\u306e\u4e2d\u3067\u306f\u6bd4\u8f03\u7684\u65b0\u3057\u3044\u3067\u3059\u304c\u30012017\u5e74\u306b\u306fGoogle\u304cAndroidOS\u5411\u3051\u306e\u30a2\u30d7\u30ea\u958b\u767a\u8a00\u8a9e\u306b\u516c\u5f0f\u63a1\u7528\u3057\u305f\u3053\u3068\u3067\u3001\u4e00\u8e8d\u811a\u5149\u3092\u6d74\u3073\u3001\u4eba\u6c17\u306b\u706b\u304c\u4ed8\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<h2 id=\"outline__2\" class=\"wp-block-heading\">Kotlin\u306e\u7279\u5fb4<\/h2>\n\n\n<p><span class=\"markerYellow\"><strong>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u306e\u8a00\u8a9e<\/strong><\/span><\/p>\n<p>Kotlin \u306f\u3001Java \u3068\u540c\u69d8\u306b\u300c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u8a00\u8a9e\u300d\u3067\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u8a00\u8a9e\u3068\u306f\u3001\u300c\u30af\u30e9\u30b9\u300d\u3068\u547c\u3070\u308c\u308b\u8a2d\u8a08\u56f3\u3092\u4f5c\u6210\u3057\u3001\u30af\u30e9\u30b9\u3092\u3082\u3068\u306b\u300c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u300d\u3068\u547c\u3070\u308c\u308b\u5b9f\u4f53\u3092\u751f\u6210\u3057\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u547d\u4ee4\u3059\u308b\u3053\u3068\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u52d5\u304b\u3059\u8a00\u8a9e\u3067\u3059\u3002<\/p>\n\n\n<blockquote class=\"wp-embedded-content\" data-secret=\"FJsGCekxZ2\"><a href=\"https:\/\/techmania.jp\/blog\/programming0004\/\">\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u3068\u306f\uff5c\u4f8b\u3048\u3092\u4ea4\u3048\u3066\u3010\u5fb9\u5e95\u89e3\u8aac\u3011<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"&#8220;\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u3068\u306f\uff5c\u4f8b\u3048\u3092\u4ea4\u3048\u3066\u3010\u5fb9\u5e95\u89e3\u8aac\u3011&#8221; &#8212; TechMania\" src=\"https:\/\/techmania.jp\/blog\/programming0004\/embed\/#?secret=AiE106IrFC#?secret=FJsGCekxZ2\" data-secret=\"FJsGCekxZ2\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n\n\n<p><span class=\"markerYellow\"><strong>Java\u3068\u4e92\u63db\u6027\u304c\u3042\u308b<\/strong><\/span><\/p>\n<p>Kotlin\u306fJava\u3068\u306e\u4e92\u63db\u6027\u304c\u3042\u308a\u3001Kotlin \u304b\u3089 Java \u3092\u3001Java \u304b\u3089 Kotlin \u3092\u547c\u3073\u51fa\u305b\u308b\u305f\u3081\u3001\u52b9\u7387\u306e\u826f\u3044\u904b\u7528\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u65e2\u5b58\u306eJava\u306e\u30b3\u30fc\u30c9\u3092\u5229\u7528\u3059\u308b\u5834\u5408\u3001\u65e2\u5b58\u306e\u30b3\u30fc\u30c9\u306b\u3001\u65b0\u898f\u3067\u8ffd\u52a0\u3059\u308b\u6a5f\u80fd\u306e\u307f Kotlin \u3067\u66f8\u304d\u3001Java\u306b\u5909\u63db\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<\/p>\n<p><span class=\"markerYellow\"><strong>Android\u30a2\u30d7\u30ea\u958b\u767a\u306b\u304a\u3051\u308b\u516c\u5f0f\u8a00\u8a9e<\/strong><\/span><\/p>\n<p>Google \u306f2017\u5e74\u306b Kotlin \u3092 Android \u306e\u6b63\u5f0f\u8a00\u8a9e\u306b\u3059\u308b\u3068\u767a\u8868\u3057\u3001\u30b5\u30dd\u30fc\u30c8\u3092\u884c\u3046\u3068\u5ba3\u8a00\u3057\u307e\u3057\u305f\u3002\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u304c200\u7a2e\u985e\u4ee5\u4e0a\u3042\u308b\u306a\u304b\u3001Kotlin \u306f2011\u5e74\u306b\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u3001\u6bd4\u8f03\u7684\u65b0\u3057\u3044\u8a00\u8a9e\u3067\u3057\u305f\u304c\u3001Google\u306e\u767a\u8868\u306b\u3088\u3063\u3066\u3001\u4e00\u8e8d\u6ce8\u76ee\u3092\u6d74\u3073\u307e\u3057\u305f\u3002<\/p>\n<p><strong><span class=\"markerYellow\">\u6c4e\u7528\u6027<\/span><\/strong><\/p>\n<p>Kotlin\u306fJava\u3088\u308a\u3082\u5b89\u5168\u306b\u66f8\u3051\u308b\u3088\u3046\u6539\u826f\u3055\u308c\u3001\u7523\u696d\u5229\u7528\u5411\u3051\u306b\u958b\u767a\u3055\u308c\u307e\u3057\u305f\u3002\u305d\u306e\u305f\u3081\u3001Kotlin \u306e\u6c4e\u7528\u6027\u306f\u304b\u306a\u308a\u9ad8\u3044\u3067\u3059\u3002<\/p>\n<p>Java\u304c\u6301\u3064\u30e1\u30ea\u30c3\u30c8\u306b\u52a0\u3048\u3066\u3001\u3088\u308aJava\u3092\u7c21\u6f54\u306b\u66f8\u3051\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u30b7\u30b9\u30c6\u30e0\u958b\u767a\u306b\u304a\u3044\u3066\u3001Java\u3067\u306f\u591a\u304f\u3066\u8907\u96d1\u306b\u306a\u3063\u3066\u3057\u307e\u3063\u305f\u30b3\u30fc\u30c9\u3082\u3001\u77ed\u304f\u7c21\u6f54\u306b\u66f8\u3051\u308b\u305f\u3081\u3001\u8ca0\u62c5\u306e\u8efd\u6e1b\u306b\u4e00\u5f79\u8cb7\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><strong><span class=\"markerYellow\">\u5b89\u5168\u6027<\/span><\/strong><\/p>\n<p>Kotlin\u306f\u5b89\u5168\u6027\u304c\u9ad8\u304f\u3001\u30b3\u30fc\u30c9\u304c\u7c21\u6f54\u3067\u30d0\u30b0\u3092\u767a\u751f\u3055\u305b\u306b\u304f\u3044\u69cb\u9020\u306b\u306a\u3063\u3066\u3044\u308b\u3046\u3048\u306b\u3001Kotlin\u306b\u306f\u300cNull Safety\uff08Null\u5b89\u5168\uff09\u300d\u3068\u3044\u3046\u4ed5\u69d8\u304c\u3042\u308a\u3001Java\u3067\u306f\u3001\u3057\u3070\u3057\u3070\u767a\u751f\u3057\u3066\u3057\u307e\u3046Null\u53c2\u7167\u304c\u539f\u56e0\u306e\u5b9f\u884c\u6642\u30a8\u30e9\u30fc\u3092\u9632\u3052\u308b\u306e\u3067\u3001Java\u3088\u308a\u5b89\u5168\u306b\u958b\u767a\u3067\u304d\u307e\u3059\u3002<\/p>\n<div class=\"questionBox\">\n<p>Null\u53c2\u7167\u3068\u306f<br \/>Null\u3068\u306f\u4f55\u3082\u306a\u3044\u3053\u3068\u3092\u8868\u3057\u3066\u304a\u308a\u3001\u4f55\u3082\u306a\u3044\u5b9f\u884c\u304c\u8d77\u3053\u3063\u305f\u969b\u306b\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u3089\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3001\u4e0d\u6b63\u306a\u30a2\u30af\u30bb\u30b9\u3092\u9632\u3050\u3053\u3068\u3002<\/p>\n<\/div>\n<div class=\"questionBox\">\n<p>Null\u5b89\u5168\u3068\u306f<br \/>\u300cNull\u5b89\u5168\uff08Null Safety\uff09\u300d\u3068\u306fKotlin\u306e\u8a00\u8a9e\u4ed5\u69d8\u3067\u3001Null\u53c2\u7167\u306b\u3088\u3063\u3066\u8d77\u3053\u308b\u5b9f\u884c\u6642\u30a8\u30e9\u30fc\u3092\u672a\u7136\u306b\u9632\u3050\u4ed5\u7d44\u307f\u3002<\/p>\n<\/div>\n<div style=\"margin-top:4%;\">\n<p style=\"text-align:center; text-decoration:underline blue; font-weight:bold;\"><a href=\"https:\/\/techmania.jp\/lp\/2\">\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u57fa\u790e\u304b\u3089\u30b5\u30a4\u30c8\u5236\u4f5c\u307e\u3067<br \/>\u2193\u5b9f\u8df5\u529b\u304c\u8eab\u306b\u3064\u304f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u2193<\/a><\/p>\n<\/div>\n<div style=\"text-align:center; margin-top:1%;\"><a href=\"https:\/\/techmania.jp\/lp\/2\"><img decoding=\"async\" style=\"width:300px;\" alt=\"IT\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u5b66\u6821 \u30c6\u30c3\u30af\u30de\u30cb\u30a2\u30b9\u30af\u30fc\u30eb\" src=\"https:\/\/techmania.jp\/blog\/wp-content\/uploads\/2023\/05\/sc4.jpg\"><\/a><\/div>\n<div style=\"margin-top:-0.3%;\">\n<p style=\"text-align:center; text-decoration:underline red; font-weight:bold;\"><a href=\"https:\/\/techmania.jp\/lp\/2\"><font color=\"red\">\u226b\u30e2\u30cb\u30bf\u30fc\u5272\u5f15\u30ad\u30e3\u30f3\u30da\u30fc\u30f3\u5b9f\u65bd\u4e2d\uff01\u226a<\/font><\/a><\/p>\n<\/div>\n\n\n<h2 id=\"outline__3\" class=\"wp-block-heading\">Kotlin\u3067\u958b\u767a\u3067\u304d\u308b\u3082\u306e<\/h2>\n\n\n\n<img decoding=\"async\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/20220106\/iStock-1335466801.jpg\" class=\"post-img\">\n\n\n<p>\u3053\u3053\u304b\u3089\u306f\u3001\u5b9f\u969b\u306bKotlin\u3067\u3069\u3046\u3044\u3063\u305f\u958b\u767a\u304c\u3067\u304d\u308b\u304b\u3092\u7d39\u4ecb\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p><strong><span class=\"markerYellow\">Android\u30a2\u30d7\u30ea\u958b\u767a<\/span><\/strong><br \/>\u4e3b\u306b\u30b9\u30de\u30db\u3084\u30bf\u30d6\u30ec\u30c3\u30c8\u306a\u3069\u306eAndroid\u30a2\u30d7\u30ea\u306e\u958b\u767a\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>Android\u306f\u3001\u30b9\u30de\u30db\u3084\u30bf\u30d6\u30ec\u30c3\u30c8\u306eOS\u3092\u6307\u3057\u307e\u3059\u304c\u3001AndroidOS\u306f\u4e16\u754c\u3067\u3082\u30c8\u30c3\u30d7\u30b7\u30a7\u30a2\u3092\u8a87\u308b\u30b9\u30de\u30dbOS\u3067\u3042\u308b\u305f\u3081\u3001Android\u30a2\u30d7\u30ea\u958b\u767a\u3092\u884c\u3063\u3066\u3044\u308b\u4f01\u696d\u3084\u6848\u4ef6\u306f\u8c4a\u5bcc\u306b\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u524d\u306fAndroid\u30a2\u30d7\u30ea\u306e\u958b\u767a\u73fe\u5834\u3067\u306f\u3001Java\u304c\u7528\u3044\u3089\u308c\u308b\u3053\u3068\u304c\u591a\u304b\u3063\u305f\u3067\u3059\u304c\u30012017\u5e74\u306bAndroid\u30a2\u30d7\u30ea\u958b\u767a\u306e\u63a8\u5968\u8a00\u8a9e\u304cKotlin\u306b\u306a\u3063\u3066\u4ee5\u964d\u306f\u3001\u591a\u304f\u306e\u6848\u4ef6\u3067Kotlin\u304c\u63a1\u7528\u3055\u308c\u59cb\u3081\u307e\u3057\u305f\u3002<\/p>\n<p>\u3053\u308c\u304b\u3089Android\u30a2\u30d7\u30ea\u306e\u958b\u767a\u3092\u304a\u8003\u3048\u306e\u65b9\u306f\u3001Kotlin\u3092\u5b66\u7fd2\u3059\u308b\u306e\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/p>\n<p>\u203bKotlin\u3067\u306fiPhone\u306a\u3069\u306eiOS\u30a2\u30d7\u30ea\u306f\u958b\u767a\u3067\u304d\u306a\u3044\u305f\u3081\u3001iOS\u30a2\u30d7\u30ea\u3092\u958b\u767a\u306b\u306f\u3001Objective-C\u3084Swift\u3068\u3044\u3063\u305f\u8a00\u8a9e\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><span class=\"markerYellow\"><strong>Web\u30a2\u30d7\u30ea\u958b\u767a<\/strong><\/span><br \/>Kotlin\u3068\u8a00\u3048\u3070\u3001Android\u30a2\u30d7\u30ea\u958b\u767a\u306b\u5f37\u3044\u30a4\u30e1\u30fc\u30b8\u3082\u3042\u308a\u307e\u3059\u304c\u3001\u5b9f\u306fWeb\u30a2\u30d7\u30ea\u958b\u767a\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>Web\u30a2\u30d7\u30ea\u306f\u3001\u30d6\u30e9\u30a6\u30b6\u4e0a\u3067\u52d5\u304f\u30a2\u30d7\u30ea\u3092\u6307\u3057\u3001\u3082\u3068\u3082\u3068\u306f\u300cPython\u300d\u3084\u300cRuby\u300d\u304cWeb\u7cfb\u306e\u8a00\u8a9e\u3068\u3057\u3066\u4e3b\u6d41\u3067\u3057\u305f\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001Kotlin\u306e\u4eba\u6c17\u304c\u51fa\u3066\u304d\u3066\u304b\u3089\u306f\u3001\u5f90\u3005\u306bWeb\u30a2\u30d7\u30ea\u306e\u958b\u767a\u73fe\u5834\u3067\u3082\u4f7f\u308f\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u4eca\u306fAndroid\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u767a\u306e\u30a4\u30e1\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u4eca\u5f8c\u306f\u3055\u3089\u306bWeb\u30a2\u30d7\u30ea\u3067\u3082\u4eba\u6c17\u304c\u51fa\u3066\u304f\u308b\u3068\u8003\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n<p>Web\u30a2\u30d7\u30ea\u306e\u958b\u767a\u3092\u5b66\u3073\u305f\u3044\u65b9\u306f\u3001\u4eca\u5f8c\u3092\u898b\u636e\u3048\u3066Kotlin\u3092\u5b66\u7fd2\u3057\u3066\u304a\u304f\u3068\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p><strong><span class=\"markerYellow\">Kotlin\u3067\u4f5c\u3089\u308c\u305f\u4e3b\u306a\u30a2\u30d7\u30ea<\/span><\/strong><br \/>\u7d9a\u3044\u3066Kotlin\u3067\u5b9f\u969b\u306b\u4f5c\u3089\u308c\u305f\u4ee3\u8868\u7684\u306a\u30a2\u30d7\u30ea\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u5b9f\u969b\u306b\u4f5c\u3089\u308c\u305f\u30a2\u30d7\u30ea\u304c\u3069\u3093\u306a\u3082\u306e\u304b\u898b\u3066\u307f\u308b\u3068\u3001Kotlin\u304c\u3069\u3093\u306a\u958b\u767a\u8a00\u8a9e\u304b\u30a4\u30e1\u30fc\u30b8\u304c\u6e67\u304d\u3084\u3059\u304f\u306a\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>Kotlin\u3067\u958b\u767a\u3055\u308c\u305f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u30fbLINE<br \/>\u30fbTwitter<br \/>\u30fbYahoo!\u30cb\u30e5\u30fc\u30b9\u30a2\u30d7\u30ea<br 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