{"id":4092,"date":"2025-10-28T20:00:00","date_gmt":"2025-10-28T11:00:00","guid":{"rendered":"https:\/\/www.java-career.com\/column\/?p=4092"},"modified":"2025-10-28T19:17:08","modified_gmt":"2025-10-28T10:17:08","slug":"development_language_kotlin","status":"publish","type":"post","link":"https:\/\/www.java-career.com\/column\/tech\/development_language_kotlin\/","title":{"rendered":"Android\u958b\u767a\u3067\u6ce8\u76ee\u306eKotlin\u3068\u306f\uff1fJava\u3068\u306e\u9055\u3044\u3084\u5c06\u6765\u6027\u3092\u89e3\u8aac"},"content":{"rendered":"\n<p>Kotlin\uff08\u30b3\u30c8\u30ea\u30f3\uff09\u3068\u306f\u3001Google\u304cAndroid\u30a2\u30d7\u30ea\u958b\u767a\u306e\u516c\u5f0f\u8a00\u8a9e\u3068\u3057\u3066\u63a1\u7528\u3057\u305f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3059\u3002<\/p>\n\n\n\n<p><meta charset=\"utf-8\">Kotlin\u306fJava\u3068\u6bd4\u3079\u3066\u30b3\u30fc\u30c9\u304c\u77ed\u304f\u7c21\u6f54\u306b\u8a18\u8ff0\u3067\u304d\u3066\u3001\u958b\u767a\u8005\u304c\u7406\u89e3\u3057\u3084\u3059\u3044\u308f\u304b\u308a\u3084\u3059\u3055\u304c\u4eba\u6c17\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306fJava\u3068\u306e\u9055\u3044\u3084\u30e1\u30ea\u30c3\u30c8\u30fb\u30c7\u30e1\u30ea\u30c3\u30c8\u3001\u5c06\u6765\u6027\u3001\u30b3\u30fc\u30c9\u306e\u7279\u5fb4\u307e\u3067\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3001\u5b66\u7fd2\u65b9\u6cd5\u3084\u30ad\u30e3\u30ea\u30a2\u306e\u53ef\u80fd\u6027\u3082\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<!--more-->\n\n\n\n<p><meta charset=\"utf-8\">\u25a0\u25a1<meta charset=\"utf-8\">\u25a0\u25a1<a href=\"https:\/\/www.java-career.com\/regist\/\" target=\"_blank\" rel=\"noreferrer noopener\" title=\"https:\/\/www.java-career.com\/regist\/\">\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306a\u3069IT\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u76ee\u6307\u3057\u3066\u3044\u308b\u306a\u3089IT\u696d\u754c\u5c02\u9580\u8ee2\u8077\u30b5\u30a4\u30c8\u300cJava\u30ad\u30e3\u30ea\u300d\u304c\u6700\u9069\uff01\u5b8c\u5168\u7121\u6599\u306e\u4f1a\u54e1\u767b\u9332\u306f\u3053\u3061\u3089\u304b\u3089<\/a><meta charset=\"utf-8\">\u25a0\u25a1<meta charset=\"utf-8\">\u25a0\u25a1<\/p>\n\n\n\n<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">Contents<\/p><ul class=\"toc_list\"><li><a href=\"#Kotlin\">Kotlin\uff08\u30b3\u30c8\u30ea\u30f3\uff09\u3068\u306f<\/a><ul><li><a href=\"#Java\">Java\u3068\u306e\u9055\u3044<\/a><\/li><\/ul><\/li><li><a href=\"#Kotlin-2\">Kotlin\u3092\u5229\u7528\u3059\u308b\u30e1\u30ea\u30c3\u30c8<\/a><ul><li><a href=\"#i\">\u30b3\u30fc\u30c9\u304c\u30b7\u30f3\u30d7\u30eb\u3067\u308f\u304b\u308a\u3084\u3059\u3044<\/a><\/li><li><a href=\"#i-2\">\u5b89\u5168\u3067\u5b89\u5b9a\u3057\u305f\u30b7\u30b9\u30c6\u30e0\u3092\u69cb\u7bc9\u3057\u3084\u3059\u3044<\/a><\/li><li><a href=\"#Java-2\">Java\u304b\u3089\u306e\u79fb\u884c\u304c\u3057\u3084\u3059\u3044<\/a><\/li><li><a href=\"#AndroidGoogle\">Android\u30a2\u30d7\u30ea\u958b\u767a\u3092Google\u304c\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b<\/a><\/li><\/ul><\/li><li><a href=\"#Kotlin-3\">Kotlin\u3092\u5229\u7528\u3059\u308b\u30c7\u30e1\u30ea\u30c3\u30c8<\/a><ul><li><a href=\"#i-3\">\u958b\u767a\u306b\u95a2\u3059\u308b\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304c\u5c11\u306a\u3044<\/a><\/li><li><a href=\"#Android\">Android\u30a2\u30d7\u30ea\u958b\u767a\u4ee5\u5916\u306e\u4e8b\u4f8b\u304c\u5c11\u306a\u3044<\/a><\/li><\/ul><\/li><li><a href=\"#Kotlin-4\">Kotlin\u306e\u5c06\u6765\u6027<\/a><\/li><li><a href=\"#Kotlin-5\">Kotlin\u306e\u30b3\u30fc\u30c9\u306e\u7279\u5fb4<\/a><ul><li><a href=\"#i-4\">\u95a2\u6570\u306e\u578b\u5ba3\u8a00\u3092\u5f8c\u308d\u306b\u7f6e\u304f<\/a><\/li><li><a href=\"#i-5\">\u884c\u672b\u306e\u30bb\u30df\u30b3\u30ed\u30f3\u3092\u7701\u7565\u3067\u304d\u308b<\/a><\/li><li><a href=\"#ifswitch\">if\u3068switch\u306e\u6271\u3044<\/a><\/li><li><a href=\"#valvar2\">\u5909\u6570\u5ba3\u8a00\u306fval\u3068var\u306e2\u3064\u3092\u4f7f\u3044\u5206\u3051\u308b<\/a><\/li><li><a href=\"#i-6\">\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u7528\u3067\u304d\u308b<\/a><\/li><\/ul><\/li><li><a href=\"#Kotlin-6\">Kotlin\u306e\u5b66\u7fd2\u65b9\u6cd5<\/a><ul><li><a href=\"#i-7\">\u30aa\u30f3\u30e9\u30a4\u30f3\u30b5\u30a4\u30c8\u3067\u72ec\u5b66\u3059\u308b<\/a><\/li><li><a href=\"#i-8\">\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u306b\u901a\u3046<\/a><\/li><\/ul><\/li><li><a href=\"#Kotlin-7\">\u5c06\u6765\u6027\u306e\u898b\u8fbc\u3081\u308bKotlin\u306e\u7fd2\u5f97\u3067\u6d3b\u8e8d\u5834\u304c\u5897\u3048\u308b\u53ef\u80fd\u6027\u304c\u9ad8\u3044<\/a><\/li><\/ul><\/div>\n<h2><span id=\"Kotlin\">Kotlin\uff08\u30b3\u30c8\u30ea\u30f3\uff09\u3068\u306f<\/span><\/h2>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" src=\"https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/216227148.jpeg\" alt=\"Kotlin\uff08\u30b3\u30c8\u30ea\u30f3\uff09\u3068\u306f\u3069\u3093\u306a\u8a00\u8a9e\u306a\u306e\uff1f\" class=\"wp-image-4112\" width=\"600\" height=\"336\" srcset=\"https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/216227148.jpeg 800w, https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/216227148-300x168.jpeg 300w, https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/216227148-768x430.jpeg 768w, https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/216227148-304x170.jpeg 304w, https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/216227148-282x158.jpeg 282w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/figure><\/div>\n\n\n\n<p>Kotlin\uff08\u30b3\u30c8\u30ea\u30f3\uff09\u3068\u306f\u30012011\u5e74\u306bJetBrains\u793e\u304c\u958b\u767a\u3057\u305f\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3001Java\u306e\u30b7\u30f3\u30d7\u30eb\u306a\u4ee3\u66ff\u8a00\u8a9e\u3068\u3057\u3066\u6ce8\u76ee\u3092\u96c6\u3081\u3066\u3044\u307e\u3059\u3002Google\u306f2017\u5e74\u306bKotlin\u3092Android\u30a2\u30d7\u30ea\u958b\u767a\u306e\u516c\u5f0f\u8a00\u8a9e\u306b\u63a1\u7528\u3057\u3066\u304a\u308a\u3001\u73fe\u5728\u3067\u306f\u591a\u304f\u306e\u30a8\u30f3\u30b8\u30cb\u30a2\u304c\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3><span id=\"Java\">Java\u3068\u306e\u9055\u3044<\/span><\/h3>\n\n\n\n<p>Kotlin\u3068Java\u306e\u4e3b\u306a\u9055\u3044\u306f\u3001\u30b3\u30fc\u30c9\u306e\u7c21\u6f54\u3055\u3068\u5b89\u5168\u6027\u306b\u3042\u308a\u307e\u3059\u3002Android\u30a2\u30d7\u30ea\u958b\u767a\u3067\u306f\u3001Kotlin\u3092\u4f7f\u3046\u3053\u3068\u3067\u52b9\u7387\u7684\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u8a18\u8ff0\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u300c\u6587\u5b57\u5217\u306e\u51fa\u529b\u300d\u3067\u306f\u3001\u4e0b\u8a18\u306e\u3088\u3046\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"has-background\" style=\"background-color:#e4e4e4\">\/\/ Java<br>System.out.println(&#8220;Hello World&#8221;);<\/p>\n\n\n\n<p class=\"has-background\" style=\"background-color:#e4e4e4\">\/\/ Kotlin<br>println(&#8220;Hello World&#8221;)<br>Kotlin\u306e\u3053\u306e\u30b7\u30f3\u30d7\u30eb\u3055\u306f\u3001\u958b\u767a\u8005\u306b\u3068\u3063\u3066\u5b66\u7fd2\u30b3\u30b9\u30c8\u524a\u6e1b\u3084\u958b\u767a\u30b9\u30d4\u30fc\u30c9\u5411\u4e0a\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<!-- 202307 CTA -->\n<div class=\"box-bridge-cta\">\n    <div class=\"box-bridge-link\">\n        <a href=\"https:\/\/www.java-career.com\/regist\/\" target=\"_blank\" rel=\"noopener\">\n        <img class=\"pc\" src=\"\/column\/wp-content\/uploads\/2023\/07\/bridge-cta.jpg\" alt=\"IT\u696d\u754c\u3078\u306e\u8ee2\u8077\u3092\u8003\u3048\u308bJava\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u305f\u3081\u306b\u7279\u5316\u3057\u305f\u6c42\u4eba\u30b5\u30a4\u30c8\u300cJava\u30ad\u30e3\u30ea\u300d\">\n        <img class=\"sp\" src=\"\/column\/wp-content\/uploads\/2023\/07\/sp-bridge-cta.jpg\" alt=\"IT\u696d\u754c\u3078\u306e\u8ee2\u8077\u3092\u8003\u3048\u308bJava\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u305f\u3081\u306b\u7279\u5316\u3057\u305f\u6c42\u4eba\u30b5\u30a4\u30c8\u300cJava\u30ad\u30e3\u30ea\u300d\u300d\"><\/a>\n    <\/div>\n    <ul>\n        <li><a href=\"https:\/\/www.java-career.com\/static\/about.html\" target=\"_blank\" rel=\"noopener\">Java\u30ad\u30e3\u30ea\u3068\u306f<\/a><\/li>\n        <li><a href=\"https:\/\/www.java-career.com\/regist\/\" target=\"_blank\" rel=\"noopener\">\u4f1a\u54e1\u767b\u9332\u306f\u3053\u3061\u3089<\/a><\/li>\n    <\/ul>\n<\/div>\n<!-- 202307 CTA\u3053\u3053\u307e\u3067 -->\n\n\n\n<h2><span id=\"Kotlin-2\">Kotlin\u3092\u5229\u7528\u3059\u308b\u30e1\u30ea\u30c3\u30c8<\/span><\/h2>\n\n\n\n<p>Kotlin\u306f\u3001Google\u304cAndroid\u30a2\u30d7\u30ea\u958b\u767a\u306e\u516c\u5f0f\u8a00\u8a9e\u3068\u3057\u3066\u63a1\u7528\u3057\u305f\u3053\u3068\u3067\u5927\u304d\u306a\u6ce8\u76ee\u3092\u96c6\u3081\u3066\u3044\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u30a8\u30f3\u30b8\u30cb\u30a2\u304cKotlin\u3092\u9078\u3076\u7406\u7531\u3068\u5177\u4f53\u7684\u306a\u5f37\u307f\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3><span id=\"i\">\u30b3\u30fc\u30c9\u304c\u30b7\u30f3\u30d7\u30eb\u3067\u308f\u304b\u308a\u3084\u3059\u3044<\/span><\/h3>\n\n\n\n<p>Kotlin\u306fJava\u3068\u6bd4\u3079\u3066\u30b3\u30fc\u30c9\u304c\u77ed\u304f\u7c21\u6f54\u3067\u3001\u958b\u767a\u8005\u304c\u7406\u89e3\u3057\u3084\u3059\u3044\u8a18\u8ff0\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<p>Java\u3067\u306f\u540c\u3058\u51e6\u7406\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306b\u591a\u304f\u306e\u30b3\u30fc\u30c9\u3092\u66f8\u304b\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u5834\u9762\u304c\u591a\u304f\u3042\u308a\u307e\u3059\u3002\u4e00\u65b9\u3067Kotlin\u306f\u6587\u6cd5\u304c\u6d17\u7df4\u3055\u308c\u3066\u304a\u308a\u3001\u884c\u672b\u306e\u30bb\u30df\u30b3\u30ed\u30f3\u304c\u4e0d\u8981\u3001\u5197\u9577\u306a\u578b\u5ba3\u8a00\u306e\u7701\u7565\u3001\u95a2\u6570\u306e\u7c21\u6f54\u306a\u8a18\u8ff0\u306a\u3069\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<h3><span id=\"i-2\">\u5b89\u5168\u3067\u5b89\u5b9a\u3057\u305f\u30b7\u30b9\u30c6\u30e0\u3092\u69cb\u7bc9\u3057\u3084\u3059\u3044<\/span><\/h3>\n\n\n\n<p>Kotlin\u306f\u300cNull safety\u300d\u3092\u5099\u3048\u3066\u304a\u308a\u3001\u30a8\u30e9\u30fc\u306e\u767a\u751f\u3092\u672a\u7136\u306b\u9632\u304e\u3001\u5b89\u5168\u6027\u306e\u9ad8\u3044\u30b7\u30b9\u30c6\u30e0\u3092\u69cb\u7bc9\u3057\u3084\u3059\u3044\u8a00\u8a9e\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u767a\u3067\u306f\u300cNullPointerException\u300d\u306b\u3088\u308b\u30b7\u30b9\u30c6\u30e0\u30a8\u30e9\u30fc\u304c\u5927\u304d\u306a\u554f\u984c\u3068\u306a\u308a\u307e\u3059\u3002Kotlin\u306f\u5909\u6570\u306b\u300cnull\u300d\u3092\u8a31\u5bb9\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u660e\u793a\u7684\u306b\u533a\u5225\u3067\u304d\u308b\u305f\u3081\u3001\u5b9f\u884c\u6642\u30a8\u30e9\u30fc\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<h3><span id=\"Java-2\">Java\u304b\u3089\u306e\u79fb\u884c\u304c\u3057\u3084\u3059\u3044<\/span><\/h3>\n\n\n\n<p>Kotlin\u306fJava\u3068\u9ad8\u3044\u4e92\u63db\u6027\u3092\u6301\u3064\u305f\u3081\u3001\u65e2\u5b58\u306eJava\u30b3\u30fc\u30c9\u3092\u6d3b\u304b\u3057\u306a\u304c\u3089\u6bb5\u968e\u7684\u306b\u79fb\u884c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>Kotlin\u306fJVM\u4e0a\u3067\u52d5\u4f5c\u3059\u308b\u305f\u3081\u3001Java\u3067\u4f5c\u6210\u3055\u308c\u305f\u30b3\u30fc\u30c9\u3092\u305d\u306e\u307e\u307e\u5229\u7528\u3067\u304d\u307e\u3059\u3002\u65b0\u3057\u3044\u6a5f\u80fd\u306fKotlin\u3067\u958b\u767a\u3057\u3064\u3064\u3001\u53e4\u3044\u30b3\u30fc\u30c9\u306fJava\u306e\u307e\u307e\u6b8b\u3059\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002Java\u304b\u3089\u306e\u79fb\u884c\u304c\u3057\u3084\u3059\u3044\u70b9\u306f\u3001\u4f01\u696d\u306b\u3068\u3063\u3066\u5c0e\u5165\u30cf\u30fc\u30c9\u30eb\u3092\u4e0b\u3052\u3001\u958b\u767a\u52b9\u7387\u3092\u9ad8\u3081\u308b\u5927\u304d\u306a\u30e1\u30ea\u30c3\u30c8\u3067\u3059\u3002<\/p>\n\n\n\n<h3><span id=\"AndroidGoogle\">Android\u30a2\u30d7\u30ea\u958b\u767a\u3092Google\u304c\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b<\/span><\/h3>\n\n\n\n<p>Google\u306f2017\u5e74\u306bKotlin\u3092Android\u306e\u516c\u5f0f\u8a00\u8a9e\u306b\u6307\u5b9a\u3057\u3001\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3084\u958b\u767a\u30c4\u30fc\u30eb\u3067\u3082Kotlin\u306e\u5229\u7528\u3092\u5168\u9762\u7684\u306b\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001Android Studio\uff08\u516c\u5f0fIDE\uff09\u3067\u306f\u3001Kotlin\u3092\u6a19\u6e96\u3067\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u304a\u308a\u3001\u30b3\u30fc\u30c9\u88dc\u5b8c\u3084\u30c7\u30d0\u30c3\u30b0\u306a\u3069\u958b\u767a\u306b\u5fc5\u8981\u306a\u6a5f\u80fd\u304c\u5145\u5b9f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001Google\u306b\u3088\u308b\u516c\u5f0f\u30b5\u30dd\u30fc\u30c8\u306f\u3001Kotlin\u306e\u4fe1\u983c\u6027\u3092\u4fdd\u8a3c\u3059\u308b\u5927\u304d\u306a\u8981\u7d20\u3067\u3042\u308a\u3001Android\u30a2\u30d7\u30ea\u958b\u767a\u3092\u884c\u3046\u30a8\u30f3\u30b8\u30cb\u30a2\u306b\u3068\u3063\u3066\u5f37\u529b\u306a\u5f8c\u62bc\u3057\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<!-- 202307 CTA -->\n<div class=\"box-bridge-cta\">\n    <div class=\"box-bridge-link\">\n        <a href=\"https:\/\/www.java-career.com\/regist\/\" target=\"_blank\" rel=\"noopener\">\n        <img class=\"pc\" src=\"\/column\/wp-content\/uploads\/2023\/07\/bridge-cta.jpg\" alt=\"IT\u696d\u754c\u3078\u306e\u8ee2\u8077\u3092\u8003\u3048\u308bJava\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u305f\u3081\u306b\u7279\u5316\u3057\u305f\u6c42\u4eba\u30b5\u30a4\u30c8\u300cJava\u30ad\u30e3\u30ea\u300d\">\n        <img class=\"sp\" src=\"\/column\/wp-content\/uploads\/2023\/07\/sp-bridge-cta.jpg\" alt=\"IT\u696d\u754c\u3078\u306e\u8ee2\u8077\u3092\u8003\u3048\u308bJava\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u305f\u3081\u306b\u7279\u5316\u3057\u305f\u6c42\u4eba\u30b5\u30a4\u30c8\u300cJava\u30ad\u30e3\u30ea\u300d\u300d\"><\/a>\n    <\/div>\n    <ul>\n        <li><a href=\"https:\/\/www.java-career.com\/static\/about.html\" target=\"_blank\" rel=\"noopener\">Java\u30ad\u30e3\u30ea\u3068\u306f<\/a><\/li>\n        <li><a href=\"https:\/\/www.java-career.com\/regist\/\" target=\"_blank\" rel=\"noopener\">\u4f1a\u54e1\u767b\u9332\u306f\u3053\u3061\u3089<\/a><\/li>\n    <\/ul>\n<\/div>\n<!-- 202307 CTA\u3053\u3053\u307e\u3067 -->\n\n\n\n<h2><span id=\"Kotlin-3\">Kotlin\u3092\u5229\u7528\u3059\u308b\u30c7\u30e1\u30ea\u30c3\u30c8<\/span><\/h2>\n\n\n\n<p>Kotlin\u306f\u30b3\u30fc\u30c9\u304c\u7c21\u6f54\u3067\u5b89\u5168\u6027\u304c\u9ad8\u304f\u3001Android\u30a2\u30d7\u30ea\u958b\u767a\u306b\u6700\u9069\u306a\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3068\u3057\u3066\u6ce8\u76ee\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u3069\u3093\u306a\u958b\u767a\u8a00\u8a9e\u306b\u3082\u5f31\u70b9\u306f\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u3053\u3067\u306f\u3001\u5c0e\u5165\u524d\u306b\u77e5\u3063\u3066\u304a\u304d\u305f\u3044Kotlin\u306e\u30c7\u30e1\u30ea\u30c3\u30c8\u306b\u3064\u3044\u3066\u6574\u7406\u3057\u3001\u5229\u7528\u3059\u308b\u969b\u306e\u6ce8\u610f\u70b9\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3><span id=\"i-3\">\u958b\u767a\u306b\u95a2\u3059\u308b\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304c\u5c11\u306a\u3044<\/span><\/h3>\n\n\n\n<p>Kotlin\u306f\u65b0\u3057\u3044\u8a00\u8a9e\u306e\u305f\u3081\u3001Java\u306b\u6bd4\u3079\u3066\u65e5\u672c\u8a9e\u306e\u89e3\u8aac\u8a18\u4e8b\u3084\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304c\u5c11\u306a\u304f\u3001\u5b66\u7fd2\u306b\u82e6\u52b4\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>Kotlin\u306f2011\u5e74\u306b\u767b\u5834\u3057\u305f\u3070\u304b\u308a\u3067\u3001\u60c5\u5831\u304c\u5341\u5206\u306b\u6574\u3063\u3066\u3044\u306a\u3044\u9818\u57df\u304c\u6b8b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u72ec\u5b66\u3067\u5b66\u3073\u305f\u3044\u521d\u5fc3\u8005\u306b\u3068\u3063\u3066\u306f\u3001\u65e5\u672c\u8a9e\u306e\u60c5\u5831\u6e90\u304c\u9650\u3089\u308c\u3066\u3044\u308b\u70b9\u304c\u30c7\u30e1\u30ea\u30c3\u30c8\u3067\u3059\u3002\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u4e0d\u8db3\u306fKotlin\u3092\u5b66\u3076\u4e0a\u3067\u306e\u30cf\u30fc\u30c9\u30eb\u3068\u306a\u308a\u307e\u3059\u304c\u3001\u8fd1\u5e74\u306fGoogle\u3084JetBrains\u306b\u3088\u308b\u516c\u5f0f\u30b5\u30dd\u30fc\u30c8\u304c\u9032\u3093\u3067\u304a\u308a\u3001\u4eca\u5f8c\u6539\u5584\u304c\u671f\u5f85\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3><span id=\"Android\">Android\u30a2\u30d7\u30ea\u958b\u767a\u4ee5\u5916\u306e\u4e8b\u4f8b\u304c\u5c11\u306a\u3044<\/span><\/h3>\n\n\n\n<p>Kotlin\u306f\u4e3b\u306bAndroid\u30a2\u30d7\u30ea\u958b\u767a\u3067\u5229\u7528\u3055\u308c\u3066\u304a\u308a\u3001\u4ed6\u306e\u5206\u91ce\u3067\u306e\u4e8b\u4f8b\u306f\u307e\u3060\u5c11\u306a\u3044\u306e\u304c\u73fe\u72b6\u3067\u3059\u3002<\/p>\n\n\n\n<p>Kotlin\u306fJVM\u4e0a\u3067\u52d5\u4f5c\u3059\u308b\u305f\u3081\u3001\u30b5\u30fc\u30d0\u30fc\u30b5\u30a4\u30c9\u3084Web\u958b\u767a\u306b\u3082\u5229\u7528\u53ef\u80fd\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u65e5\u672c\u306b\u304a\u3044\u3066\u306fKotlin\uff1dAndroid\u958b\u767a\u3068\u3044\u3046\u30a4\u30e1\u30fc\u30b8\u304c\u5f37\u304f\u3001\u4f01\u696d\u306e\u5c0e\u5165\u4e8b\u4f8b\u3082\u9650\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001Android\u4ee5\u5916\u306e\u30b7\u30b9\u30c6\u30e0\u958b\u767a\u3067\u63a1\u7528\u3055\u308c\u306b\u304f\u3044\u3068\u3044\u3046\u8ab2\u984c\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>Kotlin\u306f\u5c06\u6765\u7684\u306b\u30b5\u30fc\u30d0\u30fc\u30b5\u30a4\u30c9\u3084Web\u3001iOS\u3068\u306e\u30af\u30ed\u30b9\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u958b\u767a\u306b\u3082\u5e83\u304c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u73fe\u6642\u70b9\u3067\u306f\u4e8b\u4f8b\u4e0d\u8db3\u304c\u30c7\u30e1\u30ea\u30c3\u30c8\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2><span id=\"Kotlin-4\">Kotlin\u306e\u5c06\u6765\u6027<\/span><\/h2>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" src=\"https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/993210478.jpeg\" alt=\"Kotlin\u306e\u5c06\u6765\u6027\u3068\u306f\" class=\"wp-image-4113\" width=\"600\" height=\"336\" srcset=\"https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/993210478.jpeg 800w, https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/993210478-300x168.jpeg 300w, https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/993210478-768x430.jpeg 768w, https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/993210478-304x170.jpeg 304w, https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/993210478-282x158.jpeg 282w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/figure><\/div>\n\n\n\n<p>Kotlin\u306fGoogle\u304cAndroid\u30a2\u30d7\u30ea\u958b\u767a\u306e\u516c\u5f0f\u8a00\u8a9e\u306b\u63a1\u7528\u3057\u305f\u3053\u3068\u304b\u3089\u3001\u4eca\u5f8c\u3082\u5b89\u5b9a\u3057\u305f\u9700\u8981\u304c\u898b\u8fbc\u307e\u308c\u308b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3059\u3002\u3055\u3089\u306bAndroid\u4ee5\u5916\u306e\u5206\u91ce\u306b\u3082\u5229\u7528\u304c\u5e83\u304c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>Kotlin\u306fJava\u3068\u306e\u4e92\u63db\u6027\u3092\u4fdd\u3061\u306a\u304c\u3089\u3001\u30b3\u30fc\u30c9\u3092\u7c21\u6f54\u304b\u3064\u5b89\u5168\u306b\u66f8\u3051\u308b\u305f\u3081\u3001\u958b\u767a\u52b9\u7387\u304c\u9ad8\u3044\u70b9\u304c\u8a55\u4fa1\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u30b5\u30fc\u30d0\u30fc\u30b5\u30a4\u30c9\u958b\u767a\u3084Web\u30a2\u30d7\u30ea\u958b\u767a\u3001\u3055\u3089\u306b\u306f\u30af\u30ed\u30b9\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u958b\u767a\uff08Kotlin Multiplatform\uff09\u3078\u306e\u5c55\u958b\u3082\u9032\u3093\u3067\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3064\u307e\u308a\u3001Kotlin\u306e\u5c06\u6765\u6027\u306f\u975e\u5e38\u306b\u9ad8\u304f\u3001Android\u30a2\u30d7\u30ea\u958b\u767a\u3092\u4e2d\u5fc3\u306b\u4eca\u5f8c\u3082\u9700\u8981\u304c\u62e1\u5927\u3059\u308b\u3053\u3068\u304c\u4e88\u60f3\u3055\u308c\u307e\u3059\u3002\u3055\u3089\u306bWeb\u3084\u30b5\u30fc\u30d0\u30fc\u30b5\u30a4\u30c9\u3001\u30af\u30ed\u30b9\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3078\u306e\u5fdc\u7528\u304c\u9032\u3081\u3070\u3001\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u6d3b\u8e8d\u306e\u5834\u306f\u307e\u3059\u307e\u3059\u5e83\u304c\u3063\u3066\u3044\u304f\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<!-- 202307 CTA -->\n<div class=\"box-bridge-cta\">\n    <div class=\"box-bridge-link\">\n        <a href=\"https:\/\/www.java-career.com\/regist\/\" target=\"_blank\" rel=\"noopener\">\n        <img class=\"pc\" src=\"\/column\/wp-content\/uploads\/2023\/07\/bridge-cta.jpg\" alt=\"IT\u696d\u754c\u3078\u306e\u8ee2\u8077\u3092\u8003\u3048\u308bJava\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u305f\u3081\u306b\u7279\u5316\u3057\u305f\u6c42\u4eba\u30b5\u30a4\u30c8\u300cJava\u30ad\u30e3\u30ea\u300d\">\n        <img class=\"sp\" src=\"\/column\/wp-content\/uploads\/2023\/07\/sp-bridge-cta.jpg\" alt=\"IT\u696d\u754c\u3078\u306e\u8ee2\u8077\u3092\u8003\u3048\u308bJava\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u305f\u3081\u306b\u7279\u5316\u3057\u305f\u6c42\u4eba\u30b5\u30a4\u30c8\u300cJava\u30ad\u30e3\u30ea\u300d\u300d\"><\/a>\n    <\/div>\n    <ul>\n        <li><a href=\"https:\/\/www.java-career.com\/static\/about.html\" target=\"_blank\" rel=\"noopener\">Java\u30ad\u30e3\u30ea\u3068\u306f<\/a><\/li>\n        <li><a href=\"https:\/\/www.java-career.com\/regist\/\" target=\"_blank\" rel=\"noopener\">\u4f1a\u54e1\u767b\u9332\u306f\u3053\u3061\u3089<\/a><\/li>\n    <\/ul>\n<\/div>\n<!-- 202307 CTA\u3053\u3053\u307e\u3067 -->\n\n\n\n<h2><span id=\"Kotlin-5\">Kotlin\u306e\u30b3\u30fc\u30c9\u306e\u7279\u5fb4<\/span><\/h2>\n\n\n\n<p>Kotlin\u306fJava\u3068\u4e92\u63db\u6027\u3092\u6301\u3061\u306a\u304c\u3089\u3001\u3088\u308a\u30e2\u30c0\u30f3\u3067\u8aad\u307f\u3084\u3059\u3044\u30b3\u30fc\u30c9\u304c\u66f8\u3051\u308b\u70b9\u304c\u7279\u5fb4\u3067\u3059\u3002\u3053\u3053\u3067\u306f\u3001Kotlin\u306a\u3089\u3067\u306f\u306e\u30b3\u30fc\u30c9\u306e\u7279\u5fb4\u3092\u5177\u4f53\u7684\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3><span id=\"i-4\">\u95a2\u6570\u306e\u578b\u5ba3\u8a00\u3092\u5f8c\u308d\u306b\u7f6e\u304f<\/span><\/h3>\n\n\n\n<p>Kotlin\u3067\u306f\u95a2\u6570\u306e\u623b\u308a\u5024\u306e\u578b\u3092\u95a2\u6570\u540d\u306e\u5f8c\u308d\u306b\u66f8\u304f\u305f\u3081\u3001\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u304c\u9ad8\u307e\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>Java\u3067\u306f\u623b\u308a\u5024\u306e\u578b\u3092\u95a2\u6570\u540d\u306e\u524d\u306b\u66f8\u304f\u5fc5\u8981\u304c\u3042\u308a\u3001\u51e6\u7406\u5185\u5bb9\u3088\u308a\u3082\u578b\u60c5\u5831\u304c\u5148\u306b\u76ee\u306b\u5165\u308a\u307e\u3059\u3002\u4e00\u65b9Kotlin\u306f\u300c\u95a2\u6570\u540d \u2192 \u5f15\u6570 \u2192 \u623b\u308a\u5024\u578b\u300d\u3068\u3044\u3046\u9806\u5e8f\u306b\u306a\u308b\u305f\u3081\u3001\u30b3\u30fc\u30c9\u3092\u8aad\u3080\u969b\u306b\u51e6\u7406\u306e\u610f\u56f3\u3092\u76f4\u611f\u7684\u306b\u7406\u89e3\u3057\u3084\u3059\u3044\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/p>\n\n\n\n<h3><span id=\"i-5\">\u884c\u672b\u306e\u30bb\u30df\u30b3\u30ed\u30f3\u3092\u7701\u7565\u3067\u304d\u308b<\/span><\/h3>\n\n\n\n<p>Kotlin\u3067\u306f\u884c\u672b\u306e\u30bb\u30df\u30b3\u30ed\u30f3\u304c\u4e0d\u8981\u3067\u3001\u30b3\u30fc\u30c9\u304c\u30b7\u30f3\u30d7\u30eb\u306b\u306a\u308a\u307e\u3059\u3002Java\u3067\u306f\u6587\u306e\u7d42\u308f\u308a\u306b\u5fc5\u305a\u30bb\u30df\u30b3\u30ed\u30f3\u304c\u5fc5\u8981\u3067\u3059\u304c\u3001Kotlin\u3067\u306f\u7701\u7565\u53ef\u80fd\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u8a18\u8ff0\u91cf\u304c\u6e1b\u308a\u3001\u30bf\u30a4\u30d7\u30df\u30b9\u306e\u30ea\u30b9\u30af\u3082\u8efd\u6e1b\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3><span id=\"ifswitch\">if\u3068switch\u306e\u6271\u3044<\/span><\/h3>\n\n\n\n<p>Kotlin\u306b\u306fswitch\u6587\u304c\u5b58\u5728\u305b\u305a\u3001\u305d\u306e\u4ee3\u308f\u308a\u306bwhen\u5f0f\u3092\u4f7f\u3044\u307e\u3059\u3002switch\u6587\u306f\u5206\u5c90\u51e6\u7406\u3092\u884c\u3046\u305f\u3081\u306e\u5b9a\u756a\u69cb\u6587\u3067\u3059\u304c\u3001Java\u3067\u306f\u8a18\u8ff0\u304c\u9577\u304f\u306a\u308a\u304c\u3061\u3067\u3059\u3002Kotlin\u306ewhen\u306f\u3088\u308a\u67d4\u8edf\u3067\u3001\u6761\u4ef6\u5f0f\u306e\u8a18\u8ff0\u3092\u7c21\u6f54\u306b\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>val x = 2<br>when (x) {<br>1 -&gt; println(&#8220;One&#8221;)<br>2 -&gt; println(&#8220;Two&#8221;)<br>else -&gt; println(&#8220;Other&#8221;)<br>}<br>\u3053\u306e\u3088\u3046\u306b\u30b7\u30f3\u30d7\u30eb\u306b\u5206\u5c90\u51e6\u7406\u3092\u8868\u73fe\u3067\u304d\u307e\u3059\u3002when\u5f0f\u306fswitch\u6587\u306e\u4ee3\u66ff\u3068\u3057\u3066\u3001Kotlin\u306e\u30b3\u30fc\u30c9\u3092\u3088\u308a\u8aad\u307f\u3084\u3059\u304f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3><span id=\"valvar2\">\u5909\u6570\u5ba3\u8a00\u306fval\u3068var\u306e2\u3064\u3092\u4f7f\u3044\u5206\u3051\u308b<\/span><\/h3>\n\n\n\n<p>Kotlin\u3067\u306f\u3001\u5909\u6570\u5ba3\u8a00\u306bval\u3068var\u306e2\u7a2e\u985e\u3092\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u3067\u3001\u5b89\u5168\u6027\u3068\u67d4\u8edf\u6027\u3092\u4e21\u7acb\u3057\u3066\u3044\u307e\u3059\u3002val\u306f\u518d\u4ee3\u5165\u4e0d\u53ef\u306e\u5909\u6570\u3067\u3001\u30a4\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\uff08\u5909\u66f4\u4e0d\u53ef\uff09\u306a\u5024\u3092\u6271\u3044\u307e\u3059\u3002\u4e00\u65b9\u3001var\u306f\u518d\u4ee3\u5165\u53ef\u80fd\u3067\u3001\u53ef\u5909\u306e\u5024\u3092\u6271\u3046\u5834\u5408\u306b\u5229\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u4f7f\u3044\u5206\u3051\u306b\u3088\u308a\u3001\u30d0\u30b0\u3092\u9632\u304e\u3064\u3064\u67d4\u8edf\u306a\u30b3\u30fc\u30c9\u8a2d\u8a08\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3><span id=\"i-6\">\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u7528\u3067\u304d\u308b<\/span><\/h3>\n\n\n\n<p>Kotlin\u306f\u30e9\u30e0\u30c0\u5f0f\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u304a\u308a\u3001\u51e6\u7406\u3092\u7c21\u6f54\u306b\u8868\u73fe\u3067\u304d\u307e\u3059\u3002\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u3046\u3068\u3001\u95a2\u6570\u3092\u5f15\u6570\u3068\u3057\u3066\u6e21\u305b\u308b\u305f\u3081\u3001\u5171\u901a\u51e6\u7406\u3092\u307e\u3068\u3081\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u5197\u9577\u306a\u30b3\u30fc\u30c9\u3092\u6e1b\u3089\u3057\u3001\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u5229\u70b9\u3092\u6d3b\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<!-- 202307 CTA -->\n<div class=\"box-bridge-cta\">\n    <div class=\"box-bridge-link\">\n        <a href=\"https:\/\/www.java-career.com\/regist\/\" target=\"_blank\" rel=\"noopener\">\n        <img class=\"pc\" src=\"\/column\/wp-content\/uploads\/2023\/07\/bridge-cta.jpg\" alt=\"IT\u696d\u754c\u3078\u306e\u8ee2\u8077\u3092\u8003\u3048\u308bJava\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u305f\u3081\u306b\u7279\u5316\u3057\u305f\u6c42\u4eba\u30b5\u30a4\u30c8\u300cJava\u30ad\u30e3\u30ea\u300d\">\n        <img class=\"sp\" src=\"\/column\/wp-content\/uploads\/2023\/07\/sp-bridge-cta.jpg\" alt=\"IT\u696d\u754c\u3078\u306e\u8ee2\u8077\u3092\u8003\u3048\u308bJava\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u305f\u3081\u306b\u7279\u5316\u3057\u305f\u6c42\u4eba\u30b5\u30a4\u30c8\u300cJava\u30ad\u30e3\u30ea\u300d\u300d\"><\/a>\n    <\/div>\n    <ul>\n        <li><a href=\"https:\/\/www.java-career.com\/static\/about.html\" target=\"_blank\" rel=\"noopener\">Java\u30ad\u30e3\u30ea\u3068\u306f<\/a><\/li>\n        <li><a href=\"https:\/\/www.java-career.com\/regist\/\" target=\"_blank\" rel=\"noopener\">\u4f1a\u54e1\u767b\u9332\u306f\u3053\u3061\u3089<\/a><\/li>\n    <\/ul>\n<\/div>\n<!-- 202307 CTA\u3053\u3053\u307e\u3067 -->\n\n\n\n<h2><span id=\"Kotlin-6\">Kotlin\u306e\u5b66\u7fd2\u65b9\u6cd5<\/span><\/h2>\n\n\n\n<p>\u8fd1\u5e74\u306f\u516c\u5f0f\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3084\u30aa\u30f3\u30e9\u30a4\u30f3\u5b66\u7fd2\u30b5\u30fc\u30d3\u30b9\u3001\u52d5\u753b\u6559\u6750\u306a\u3069\u5b66\u7fd2\u74b0\u5883\u304c\u6574\u3044\u3001\u72ec\u5b66\u3067\u3082\u52b9\u7387\u7684\u306b\u30b9\u30ad\u30eb\u3092\u7fd2\u5f97\u3067\u304d\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001Kotlin\u3092\u5b66\u3076\u5177\u4f53\u7684\u306a\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3><span id=\"i-7\">\u30aa\u30f3\u30e9\u30a4\u30f3\u30b5\u30a4\u30c8\u3067\u72ec\u5b66\u3059\u308b<\/span><\/h3>\n\n\n\n<p>Kotlin\u306f\u30aa\u30f3\u30e9\u30a4\u30f3\u5b66\u7fd2\u30b5\u30fc\u30d3\u30b9\u3084\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u6d3b\u7528\u3059\u308c\u3070\u3001\u72ec\u5b66\u3067\u3082\u7fd2\u5f97\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u300cKotlin Playground\u300d\u3068\u3044\u3046\u30aa\u30f3\u30e9\u30a4\u30f3\u74b0\u5883\u3092\u4f7f\u3048\u3070\u3001\u30d6\u30e9\u30a6\u30b6\u4e0a\u3067\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u5373\u6642\u306b\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002\u72ec\u5b66\u3067\u3082\u5b9f\u969b\u306b\u30b3\u30fc\u30c9\u3092\u66f8\u304d\u306a\u304c\u3089\u5b66\u3079\u308b\u74b0\u5883\u304c\u6574\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u81ea\u5206\u306e\u30da\u30fc\u30b9\u3067\u30b9\u30ad\u30eb\u7fd2\u5f97\u3092\u9032\u3081\u305f\u3044\u4eba\u306b\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/p>\n\n\n\n<h3><span id=\"i-8\">\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u306b\u901a\u3046<\/span><\/h3>\n\n\n\n<p>\u77ed\u671f\u9593\u3067\u52b9\u7387\u7684\u306bKotlin\u3092\u5b66\u3073\u305f\u3044\u5834\u5408\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u306e\u5229\u7528\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002\u30b9\u30af\u30fc\u30eb\u3067\u306f\u73fe\u5f79\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u8b1b\u5e2b\u304b\u3089\u76f4\u63a5\u6307\u5c0e\u3092\u53d7\u3051\u3089\u308c\u3001\u5b9f\u969b\u306e\u958b\u767a\u306b\u5373\u3057\u305f\u8ab2\u984c\u306b\u53d6\u308a\u7d44\u3081\u307e\u3059\u3002<\/p>\n\n\n\n<!-- 202307 CTA -->\n<div class=\"box-bridge-cta\">\n    <div class=\"box-bridge-link\">\n        <a href=\"https:\/\/www.java-career.com\/regist\/\" target=\"_blank\" rel=\"noopener\">\n        <img class=\"pc\" src=\"\/column\/wp-content\/uploads\/2023\/07\/bridge-cta.jpg\" alt=\"IT\u696d\u754c\u3078\u306e\u8ee2\u8077\u3092\u8003\u3048\u308bJava\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u305f\u3081\u306b\u7279\u5316\u3057\u305f\u6c42\u4eba\u30b5\u30a4\u30c8\u300cJava\u30ad\u30e3\u30ea\u300d\">\n        <img class=\"sp\" src=\"\/column\/wp-content\/uploads\/2023\/07\/sp-bridge-cta.jpg\" alt=\"IT\u696d\u754c\u3078\u306e\u8ee2\u8077\u3092\u8003\u3048\u308bJava\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u305f\u3081\u306b\u7279\u5316\u3057\u305f\u6c42\u4eba\u30b5\u30a4\u30c8\u300cJava\u30ad\u30e3\u30ea\u300d\u300d\"><\/a>\n    <\/div>\n    <ul>\n        <li><a href=\"https:\/\/www.java-career.com\/static\/about.html\" target=\"_blank\" rel=\"noopener\">Java\u30ad\u30e3\u30ea\u3068\u306f<\/a><\/li>\n        <li><a href=\"https:\/\/www.java-career.com\/regist\/\" target=\"_blank\" rel=\"noopener\">\u4f1a\u54e1\u767b\u9332\u306f\u3053\u3061\u3089<\/a><\/li>\n    <\/ul>\n<\/div>\n<!-- 202307 CTA\u3053\u3053\u307e\u3067 -->\n\n\n\n<h2><span id=\"Kotlin-7\">\u5c06\u6765\u6027\u306e\u898b\u8fbc\u3081\u308bKotlin\u306e\u7fd2\u5f97\u3067\u6d3b\u8e8d\u5834\u304c\u5897\u3048\u308b\u53ef\u80fd\u6027\u304c\u9ad8\u3044<\/span><\/h2>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" src=\"https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/811356763.jpeg\" alt=\"\u5c06\u6765\u6027\u306e\u898b\u8fbc\u3081\u308bKotlin\" class=\"wp-image-4114\" width=\"600\" height=\"202\" srcset=\"https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/811356763.jpeg 800w, https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/811356763-300x101.jpeg 300w, https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/811356763-768x258.jpeg 768w, https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/811356763-304x102.jpeg 304w, https:\/\/www.java-career.com\/column\/wp-content\/uploads\/2025\/10\/811356763-282x95.jpeg 282w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/figure><\/div>\n\n\n\n<p>Kotlin\u306e\u30b9\u30ad\u30eb\u3092\u7fd2\u5f97\u3059\u308b\u3053\u3068\u306f\u3001Android\u30a2\u30d7\u30ea\u958b\u767a\u306b\u3068\u3069\u307e\u3089\u305a\u3001\u5e45\u5e83\u3044\u5206\u91ce\u3067\u306e\u30ad\u30e3\u30ea\u30a2\u5f62\u6210\u306b\u76f4\u7d50\u3057\u307e\u3059\u3002\u3053\u308c\u304b\u3089\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u5b66\u3076\u4eba\u306b\u3068\u3063\u3066\u3082\u3001\u3059\u3067\u306bJava\u3092\u6271\u3063\u3066\u3044\u308b\u30a8\u30f3\u30b8\u30cb\u30a2\u306b\u3068\u3063\u3066\u3082\u3001Kotlin\u306f\u5c06\u6765\u6027\u306e\u3042\u308b\u8a00\u8a9e\u3067\u3042\u308a\u3001\u5b66\u3093\u3067\u304a\u3044\u3066\u640d\u306f\u306a\u3044\u9078\u629e\u80a2\u3068\u3044\u3048\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\u3055\u3089\u306b\u3001\u7fd2\u5f97\u3057\u305f\u30b9\u30ad\u30eb\u3092\u5b9f\u969b\u306e\u4ed5\u4e8b\u306b\u6d3b\u304b\u3059\u305f\u3081\u306b\u306f\u6c42\u4eba\u60c5\u5831\u306e\u53ce\u96c6\u3082\u91cd\u8981\u3067\u3059\u3002Java\u3084Kotlin\u3092\u6d3b\u7528\u3067\u304d\u308b\u6848\u4ef6\u3092\u63a2\u3059\u306a\u3089\u3001IT\u30a8\u30f3\u30b8\u30cb\u30a2\u5411\u3051\u6c42\u4eba\u30b5\u30a4\u30c8\u300cJava\u30ad\u30e3\u30ea\u300d\u306e\u5229\u7528\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002\u6700\u65b0\u306e\u6c42\u4eba\u52d5\u5411\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u81ea\u5206\u306b\u5408\u3063\u305f\u30ad\u30e3\u30ea\u30a2\u30d1\u30b9\u3092\u898b\u3064\u3051\u308b\u3053\u3068\u3067\u3001Kotlin\u30b9\u30ad\u30eb\u3092\u6b66\u5668\u306b\u6d3b\u8e8d\u306e\u5834\u3092\u5e83\u3052\u3089\u308c\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<!-- 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