{"id":6469,"date":"2026-05-19T14:52:13","date_gmt":"2026-05-19T05:52:13","guid":{"rendered":"https:\/\/route-zero.com\/recruit\/?post_type=route&#038;p=6469"},"modified":"2026-10-19T14:52:20","modified_gmt":"2026-10-19T05:52:20","slug":"java-optional-orelse-orelseget-difference","status":"publish","type":"route","link":"https:\/\/route-zero.com\/recruit\/route\/6469\/","title":{"rendered":"Java Optional\u306eorElse\u3068orElseGet\u306e\u9055\u3044"},"content":{"rendered":"<p>Java\u306eOptional.orElse\u3068orElseGet\u306e\u9055\u3044\u306f\u3001\u4ee3\u66ff\u5024\u3092\u4f5c\u308b\u51e6\u7406\u3092\u3044\u3064\u5b9f\u884c\u3059\u308b\u304b\u3067\u3059\u3002orElse(fallback())\u306fOptional\u306b\u5024\u304c\u3042\u3063\u3066\u3082fallback()\u306e\u547c\u3073\u51fa\u3057\u5f0f\u3092\u5148\u306b\u8a55\u4fa1\u3057\u307e\u3059\u3002\u4e00\u65b9\u3001orElseGet(() -&gt; fallback())\u306f\u5024\u304c\u306a\u3044\u3068\u304d\u3060\u3051Supplier\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002\u91cd\u3044\u51e6\u7406\u3084\u526f\u4f5c\u7528\u306e\u3042\u308b\u51e6\u7406\u3092\u4ee3\u66ff\u5024\u306b\u4f7f\u3046\u306a\u3089\u3001orElseGet\u3092\u691c\u8a0e\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>orElse\u3068orElseGet\u306e\u9055\u3044\u3092\u6700\u521d\u306b\u6bd4\u8f03<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u89b3\u70b9<\/th>\n<th>orElse(T other)<\/th>\n<th>orElseGet(Supplier)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u5f15\u6570<\/td>\n<td>\u4ee3\u66ff\u5024\u305d\u306e\u3082\u306e<\/td>\n<td>\u4ee3\u66ff\u5024\u3092\u4f5c\u308b\u95a2\u6570<\/td>\n<\/tr>\n<tr>\n<td>\u5024\u304c\u3042\u308b\u5834\u5408<\/td>\n<td>Optional\u5185\u306e\u5024\u3092\u8fd4\u3059\u3002\u5f15\u6570\u5f0f\u306e\u8a55\u4fa1\u306f\u3059\u3067\u306b\u6e08\u3093\u3067\u3044\u308b<\/td>\n<td>Optional\u5185\u306e\u5024\u3092\u8fd4\u3059\u3002Supplier\u3092\u547c\u3070\u306a\u3044<\/td>\n<\/tr>\n<tr>\n<td>\u5024\u304c\u306a\u3044\u5834\u5408<\/td>\n<td>\u8a55\u4fa1\u6e08\u307f\u306eother\u3092\u8fd4\u3059<\/td>\n<td>Supplier\u3092\u5b9f\u884c\u3057\u3066\u7d50\u679c\u3092\u8fd4\u3059<\/td>\n<\/tr>\n<tr>\n<td>\u5411\u304f\u7528\u9014<\/td>\n<td>\u56fa\u5b9a\u6587\u5b57\u5217\u3084\u8efd\u3044\u5b9a\u6570<\/td>\n<td>DB\u547c\u3073\u51fa\u3057\u3001\u8a08\u7b97\u3001\u30ed\u30b0\u4ed8\u304d\u306e\u4ee3\u66ff\u5024\u751f\u6210<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u9055\u3044\u306e\u4e2d\u5fc3\u306f\u300cOptional\u306e\u4e2d\u8eab\u3092\u9078\u3076\u9806\u756a\u300d\u3067\u306f\u306a\u304f\u3001\u300c\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3076\u524d\u306e\u5f15\u6570\u8a55\u4fa1\u300d\u3068\u300cSupplier\u306e\u9045\u5ef6\u5b9f\u884c\u300d\u3067\u3059\u3002<\/p>\n<blockquote>\n<p><strong>\u7528\u8a9e\u89e3\u8aac\uff1aSupplier&lt;T&gt;<\/strong><br \/>\u5024\u3092\u5f15\u6570\u306a\u3057\u3067\u751f\u6210\u3057\u3066\u8fd4\u3059\u305f\u3081\u306eJava\u306e\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u3059\u3002orElseGet\u3078\u6e21\u3059\u3068\u3001Optional\u304c\u7a7a\u306e\u5834\u5408\u306bget()\u7d4c\u7531\u3067\u547c\u3073\u51fa\u3055\u308c\u307e\u3059\u3002<\/p>\n<\/blockquote>\n<hr>\n<h2>\u5024\u304c\u3042\u308b\u306e\u306b\u4ee3\u66ff\u51e6\u7406\u304c\u8d70\u308b\u7406\u7531<\/h2>\n<p>Java\u3067\u306f\u901a\u5e38\u3001\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3076\u524d\u306b\u5f15\u6570\u5f0f\u3092\u8a55\u4fa1\u3057\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066orElse(makeFallback())\u3068\u66f8\u304f\u3068\u3001Optional\u304c\u7a7a\u304b\u3069\u3046\u304b\u306b\u95a2\u4fc2\u306a\u304fmakeFallback()\u304c\u5148\u306b\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre><code>import java.util.Optional;\r\n\r\npublic class OptionalSample {\r\n    static String makeFallback() {\r\n        System.out.println(&quot;\u4ee3\u66ff\u5024\u3092\u751f\u6210&quot;);\r\n        return &quot;guest&quot;;\r\n    }\r\n\r\n    public static void main(String[] args) {\r\n        Optional&lt;String&gt; name = Optional.of(&quot;Alice&quot;);\r\n\r\n        String a = name.orElse(makeFallback());\r\n        String b = name.orElseGet(() -&gt; makeFallback());\r\n\r\n        System.out.println(&quot;orElse: &quot; + a);\r\n        System.out.println(&quot;orElseGet: &quot; + b);\r\n    }\r\n}<\/code><\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306fmakeFallback()\u306forElse\u306e\u5f15\u6570\u5f0f\u30671\u56de\u3060\u3051\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002name\u306fAlice\u3092\u6301\u3064\u305f\u3081\u3001orElseGet\u306eSupplier\u5074\u306f\u547c\u3073\u51fa\u3055\u308c\u307e\u305b\u3093\u3002\u5b9f\u884c\u3092\u78ba\u8a8d\u3059\u308b\u5834\u5408\u306f\u30b3\u30f3\u30bd\u30fc\u30eb\u51fa\u529b\u3092\u6bd4\u8f03\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<hr>\n<h2>Optional\u304c\u7a7a\u306e\u5834\u5408\u306f\u4e21\u65b9\u3068\u3082\u4ee3\u66ff\u5024\u3092\u8fd4\u3059<\/h2>\n<pre><code>Optional&lt;String&gt; empty = Optional.empty();\r\n\r\nString first = empty.orElse(&quot;guest&quot;);\r\nString second = empty.orElseGet(() -&gt; &quot;guest&quot;);\r\n\r\nSystem.out.println(first);\r\nSystem.out.println(second);<\/code><\/pre>\n<p>\u3053\u306e\u5834\u5408\u306f\u3069\u3061\u3089\u3082guest\u306b\u306a\u308a\u307e\u3059\u3002Optional\u304c\u7a7a\u306e\u5834\u5408\u3001orElseGet\u306eSupplier\u306f\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u51e6\u7406\u7d50\u679c\u3060\u3051\u3092\u898b\u308b\u3068\u540c\u3058\u3067\u3059\u304c\u3001\u4ee3\u66ff\u5024\u3092\u4f5c\u308b\u30bf\u30a4\u30df\u30f3\u30b0\u304c\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n<hr>\n<h2>\u56fa\u5b9a\u5024\u306a\u3089orElse\u3067\u3088\u3044<\/h2>\n<p>\u4ee3\u66ff\u5024\u306b\u5358\u306a\u308b\u6587\u5b57\u5217\u3084\u65e2\u306b\u4f5c\u6210\u6e08\u307f\u306e\u5909\u6570\u3092\u6e21\u3059\u306a\u3089\u3001orElse\u3092\u9078\u3076\u65b9\u304c\u8aad\u307f\u3084\u3059\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u3059\u3079\u3066\u306eorElse\u3092orElseGet\u306b\u66f8\u304d\u63db\u3048\u308c\u3070\u901f\u304f\u306a\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<pre><code>Optional&lt;String&gt; nickname = Optional.empty();\r\nString shown = nickname.orElse(&quot;\u672a\u8a2d\u5b9a&quot;);<\/code><\/pre>\n<p>\u4e00\u65b9\u3001\u30d5\u30a1\u30a4\u30eb\u8aad\u307f\u8fbc\u307f\u30fb\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a2\u30af\u30bb\u30b9\u30fb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\u30fb\u8a08\u7b97\u306a\u3069\u304c\u4ee3\u66ff\u5024\u306b\u3042\u308b\u5834\u5408\u3001\u5024\u304c\u5b58\u5728\u3057\u3066\u3044\u3066\u3082\u4e0d\u8981\u306a\u4ed5\u4e8b\u304c\u8d77\u304d\u3066\u3044\u306a\u3044\u304b\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>\u4ee3\u66ff\u5024\u306e\u751f\u6210\u304c\u91cd\u3044\u306a\u3089orElseGet\u3092\u4f7f\u3046<\/h2>\n<pre><code>import java.util.Optional;\r\n\r\nclass ProfileExample {\r\n    static String loadDefaultProfile() {\r\n        \/\/ \u5b9f\u969b\u306b\u306f\u8a2d\u5b9a\u3084DB\u306a\u3069\u304b\u3089\u53d6\u5f97\u3059\u308b\u51e6\u7406\u3092\u60f3\u5b9a\r\n        return &quot;default-profile&quot;;\r\n    }\r\n\r\n    static String showProfile(Optional&lt;String&gt; profile) {\r\n        return profile.orElseGet(ProfileExample::loadDefaultProfile);\r\n    }\r\n}<\/code><\/pre>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306fprofile\u306b\u5024\u304c\u3042\u308c\u3070loadDefaultProfile()\u3092\u547c\u3073\u51fa\u3057\u307e\u305b\u3093\u3002\u30e1\u30bd\u30c3\u30c9\u53c2\u7167\u306f\u5b9f\u884c\u3092\u9045\u3089\u305b\u308bSupplier\u3068\u3057\u3066\u50cd\u304d\u307e\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057orElseGet\u306e\u4e2d\u3067\u526f\u4f5c\u7528\u306e\u3042\u308b\u64cd\u4f5c\u3092\u3059\u308b\u3068\u3001Optional\u304c\u7a7a\u306e\u3068\u304d\u306b\u305d\u306e\u526f\u4f5c\u7528\u306f\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u30ed\u30b0\u8a18\u9332\u3001\u66f8\u304d\u8fbc\u307f\u51e6\u7406\u3001\u5916\u90e8\u30ea\u30af\u30a8\u30b9\u30c8\u306a\u3069\u306f\u3001\u4ee3\u66ff\u51e6\u7406\u3068\u3057\u3066\u672c\u5f53\u306b\u9069\u5207\u304b\u3092\u5148\u306b\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>\u3088\u304f\u3042\u308b\u66f8\u304d\u9593\u9055\u3044\u3068\u4f8b\u5916<\/h2>\n<ul>\n<li>orElseGet(makeFallback())\u306e\u3088\u3046\u306b\u5024\u3092\u76f4\u63a5\u6e21\u3059\u3068\u3001Supplier&lt;T&gt;\u3092\u8981\u6c42\u3059\u308b\u305f\u3081\u901a\u5e38\u306f\u578b\u304c\u5408\u3044\u307e\u305b\u3093\u3002<\/li>\n<li>orElseGet(() -&gt; makeFallback())\u306fSupplier\u3092\u6e21\u3059\u6b63\u3057\u3044\u5f62\u3067\u3059\u3002<\/li>\n<li>Optional\u306e\u4e2d\u8eab\u304cnull\u306b\u306a\u308b\u60f3\u5b9a\u3067\u306f\u306a\u304f\u3001ofNullable(null)\u3067\u7a7aOptional\u3092\u4f5c\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/li>\n<li>\u5fc5\u9808\u5024\u304c\u306a\u3044\u306a\u3089\u4ee3\u66ff\u5024\u3088\u308aorElseThrow()\u304c\u9069\u5207\u306a\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002<\/li>\n<li>null\u306eSupplier\u3092\u6e21\u3059\u3068Optional\u304c\u7a7a\u306e\u5834\u5408\u306bNullPointerException\u306b\u306a\u308b\u305f\u3081\u907f\u3051\u307e\u3059\u3002<\/li>\n<\/ul>\n<pre><code>Optional&lt;String&gt; value = Optional.ofNullable(null);\r\nString selected = value.orElseGet(() -&gt; &quot;guest&quot;);\r\n\r\nOptional&lt;String&gt; required = Optional.empty();\r\n\/\/ required.orElseThrow(); \/\/ \u5fc5\u9808\u5024\u306a\u3057\u3092\u4f8b\u5916\u306b\u3059\u308b\u4f8b<\/code><\/pre>\n<p>Optional\u306e\u7d50\u679c\u304c\u5fc5\u8981\u306a\u306e\u304b\u3001\u5358\u306a\u308b\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u304c\u5fc5\u8981\u306a\u306e\u304b\u3001\u7a7a\u306a\u3089\u4f8b\u5916\u306b\u3059\u3079\u304d\u306a\u306e\u304b\u3092\u533a\u5225\u3059\u308b\u3068API\u3092\u9078\u3073\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>orElseGet\u304c\u901f\u3044\u3068\u6c7a\u3081\u3064\u3051\u306a\u3044<\/h2>\n<p>\u300c\u5fc5\u305aorElseGet\u306e\u307b\u3046\u304c\u9ad8\u901f\u300d\u3068\u65ad\u5b9a\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u4ee3\u66ff\u5024\u306e\u8a08\u7b97\u91cf\u3084\u5b9f\u884c\u983b\u5ea6\u3001JVM\u306e\u6700\u9069\u5316\u3001\u5b9f\u969b\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306b\u3088\u3063\u3066\u5dee\u306f\u5909\u308f\u308a\u307e\u3059\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>\u30b7\u30fc\u30f3<\/th>\n<th>\u5224\u65ad<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u56fa\u5b9a\u6587\u5b57\u5217\u3092\u8fd4\u3059<\/td>\n<td>orElse\u304c\u7c21\u6f54<\/td>\n<\/tr>\n<tr>\n<td>\u4ee3\u66ff\u5024\u306e\u751f\u6210\u306bI\/O\u304c\u3042\u308b<\/td>\n<td>orElseGet\u3067\u4e0d\u8981\u306a\u51e6\u7406\u3092\u56de\u907f<\/td>\n<\/tr>\n<tr>\n<td>\u526f\u4f5c\u7528\u3092\u907f\u3051\u305f\u3044<\/td>\n<td>\u3069\u306e\u6761\u4ef6\u3067\u5b9f\u884c\u3055\u308c\u308b\u304b\u3092\u660e\u793a<\/td>\n<\/tr>\n<tr>\n<td>\u5024\u304c\u306a\u3051\u308c\u3070\u51e6\u7406\u3092\u4e2d\u6b62\u3059\u308b<\/td>\n<td>orElseThrow\u306e\u7528\u9014\u3082\u78ba\u8a8d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3067\u306f\u300c\u4ee3\u66ff\u5024\u306e\u5f0f\u304c\u3044\u3064\u8a55\u4fa1\u3055\u308c\u308b\u304b\u300d\u3068\u300c\u526f\u4f5c\u7528\u304c\u8a31\u5bb9\u3055\u308c\u308b\u304b\u300d\u3092\u4e3b\u306b\u78ba\u8a8d\u3057\u3001\u6027\u80fd\u5dee\u306f\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u6e2c\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<h2>\u95a2\u9023\u3059\u308bJava\u306e\u8a18\u4e8b<\/h2>\n<p>Optional\u306fnull\u3092\u6271\u3046\u3068\u304d\u306e\u8a2d\u8a08\u5224\u65ad\u306b\u3082\u95a2\u4fc2\u3057\u307e\u3059\u3002NullPointerException\u306e\u767a\u751f\u7d4c\u8def\u3092\u78ba\u8a8d\u3057\u305f\u3044\u5834\u5408\u306f\u3001Spring Boot\u3067\u306enull\u5bfe\u7b56\u306e\u8a18\u4e8b\u304c\u5f79\u7acb\u3061\u307e\u3059\u3002\u307e\u305f\u95a2\u6570\u578b\u306e\u66f8\u304d\u65b9\u306b\u6163\u308c\u308b\u306b\u306fStream\u306e\u8a18\u4e8b\u304c\u53c2\u8003\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\uff08Java\u3068Spring Boot\u306enull\u5bfe\u7b56\u306b\u3064\u3044\u3066\u306f\u300e<a href=\"https:\/\/route-zero.com\/recruit\/route\/1624\/\">Spring Boot NullPointerException\u5b8c\u5168\u5bfe\u7b56\uff5c3\u5927\u539f\u56e0\u3068\u5b9f\u88c5\u4f8b\u307e\u3068\u3081<\/a>\u300f\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\uff09<\/p>\n<p>\uff08Java\u306e\u95a2\u6570\u578b\u51e6\u7406\u306e\u57fa\u790e\u306b\u3064\u3044\u3066\u306f\u300e<a href=\"https:\/\/route-zero.com\/recruit\/route\/1138\/\">Java\u306efor\u6587\u3092Stream\u306b\u66f8\u304d\u63db\u3048\u308b\u306b\u306f\uff1fSpring Boot\u3067\u306e\u5b9f\u8df5\u4f8b\u4ed8\u304d\u3067\u308f\u304b\u308b\uff01<\/a>\u300f\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\uff09<\/p>\n<h2>\u3088\u304f\u3042\u308b\u7591\u554f\u3068\u307e\u3068\u3081<\/h2>\n<h3>orElseGet\u306b\u306f\u5fc5\u305a\u30e9\u30e0\u30c0\u5f0f\u304c\u5fc5\u8981\uff1f<\/h3>\n<p>\u30e9\u30e0\u30c0\u5f0f\u3060\u3051\u3067\u306a\u304f\u3001Supplier&lt;T&gt;\u306b\u4e00\u81f4\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u53c2\u7167\u3082\u6e21\u305b\u307e\u3059\u3002<\/p>\n<h3>orElse\u306f\u5024\u304c\u3042\u3063\u3066\u3082\u4ee3\u66ff\u5024\u3092\u8fd4\u3059\uff1f<\/h3>\n<p>\u3044\u3044\u3048\u3002Optional\u306b\u5024\u304c\u3042\u308c\u3070\u305d\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002\u305f\u3060\u3057orElse\u3078\u6e21\u3059\u5f15\u6570\u306e\u8a08\u7b97\u306f\u547c\u3073\u51fa\u3057\u524d\u306b\u884c\u308f\u308c\u307e\u3059\u3002<\/p>\n<h3>orElseGet\u3067\u3082\u526f\u4f5c\u7528\u304c\u767a\u751f\u3059\u308b\uff1f<\/h3>\n<p>Optional\u304c\u7a7a\u306a\u3089Supplier\u304c\u5b9f\u884c\u3055\u308c\u308b\u305f\u3081\u3001\u526f\u4f5c\u7528\u306e\u3042\u308b\u51e6\u7406\u3092\u5165\u308c\u308c\u3070\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<p>Optional.orElse\u3068orElseGet\u306f\u3001\u3069\u3061\u3089\u3082\u5024\u304c\u306a\u3044\u5834\u5408\u306e\u4ee3\u66ff\u5024\u3092\u6271\u3046API\u3067\u3059\u3002\u4ee3\u66ff\u5024\u306e\u751f\u6210\u304c\u7c21\u5358\u306a\u5b9a\u6570\u306a\u3089orElse\u3001\u91cd\u3044\u51e6\u7406\u3084\u526f\u4f5c\u7528\u3092\u4f34\u3046\u751f\u6210\u306a\u3089orElseGet\u306e\u9045\u5ef6\u5b9f\u884c\u304c\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<p>\u4ee3\u66ff\u5024\u3092\u30e1\u30bd\u30c3\u30c9\u3067\u751f\u6210\u3057\u3066\u3044\u308b\u7b87\u6240\u3092\u898b\u3064\u3051\u3001Optional\u306b\u5024\u304c\u3042\u308b\u3068\u304d\u3082\u5b9f\u884c\u3055\u308c\u3066\u3088\u3044\u304b\u78ba\u8a8d\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"featured_media":6473,"template":"","meta":{"ssp_meta_title":"Java 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