{"id":2813,"date":"2024-05-02T14:28:22","date_gmt":"2024-05-02T05:28:22","guid":{"rendered":"https:\/\/www.miracleave.co.jp\/contents\/?p=2813"},"modified":"2024-05-02T14:28:24","modified_gmt":"2024-05-02T05:28:24","slug":"%e3%80%90java%e3%80%91%e3%82%88%e3%81%8f%e9%81%ad%e9%81%87%e3%81%99%e3%82%8b%e3%82%a8%e3%83%a9%e3%83%bc%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6","status":"publish","type":"post","link":"https:\/\/www.miracleave.co.jp\/contents\/2813\/%e3%80%90java%e3%80%91%e3%82%88%e3%81%8f%e9%81%ad%e9%81%87%e3%81%99%e3%82%8b%e3%82%a8%e3%83%a9%e3%83%bc%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6\/","title":{"rendered":"\u3010Java\u3011\u3088\u304f\u906d\u9047\u3059\u308b\u30a8\u30e9\u30fc\u306b\u3064\u3044\u3066"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"aioseo-\">\u306f\u3058\u3081\u306b<\/h2>\n\n\n\n<p>\u304a\u306f\u3053\u3093\u3070\u3093\u306b\u3061\u306f\uff01\u9234\u6728\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u7a81\u7136\u3067\u3059\u304c\u3001\u5012\u3057\u3066\u3082\u5012\u3057\u3066\u3082\u30a8\u30e9\u30fc\u306b\u906d\u9047\u3059\u308b\u3068\u5fc3\u304c\u6298\u308c\u305d\u3046\u306b\u306a\u308a\u307e\u305b\u3093\u304b\uff1f\u79c1\u306f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30fb\u30a8\u30e9\u30fc\u306e\u89e3\u6c7a\u65b9\u6cd5\u306a\u3069\u3092\u4f55\u5ea6\u3082\u8abf\u3079\u3066\u306f\u5fd8\u308c\u3066\u3057\u307e\u3063\u305f\u308a&#8230;<br>\u30fb\u305d\u3082\u305d\u3082\u3069\u306e\u3088\u3046\u306b\u30a8\u30e9\u30fc\u3068\u5411\u304d\u5408\u3063\u305f\u3089\u3044\u3044\u3093\u3060\u3063\u3051\uff1f<br>\u3068\u306a\u308b\u79c1\u306e\u3088\u3046\u306a\u521d\u5fc3\u8005\u306e\u65b9\u5411\u3051\u306b\u4eca\u56de\u306fJava\u306e\u30a8\u30e9\u30fc\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u3066\u307f\u305f\u3044\u3068\u601d\u3044\u307e\u3059\uff01<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"aioseo-java\">Java\u306e\u30a8\u30e9\u30fc\u306e\u7a2e\u985e\u306b\u3064\u3044\u3066<\/h2>\n\n\n\n<p>\u30a8\u30e9\u30fc\u306b\u306f\u3001Java \u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u6587\u6cd5\u4e0a\u306e\u554f\u984c\u304c\u3042\u3063\u305f\u3068\u304d\u306b\u767a\u751f\u3059\u308b<strong>\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/strong>\u3068\u3001<br>\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u4e0d\u53ef\u80fd\u306a\u51e6\u7406\u3092\u884c\u306a\u304a\u3046\u3068\u3057\u305f\u3068\u304d\u306b\u767a\u751f\u3059\u308b<strong>\u5b9f\u884c\u6642\u30a8\u30e9\u30fc<\/strong>\u306e\uff12\u3064\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u7c21\u5358\u306b\u305d\u308c\u305e\u308c\u30a8\u30e9\u30fc\u306e\u7a2e\u985e\u3068\u306a\u305c\u8d77\u304d\u308b\u304b\u3092\u7d39\u4ecb\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\uff01<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"aioseo-\"><strong>\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/strong><\/h3>\n\n\n\n<p><span class=\"swl-format-1\"><strong>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642<\/strong>\u306b\u691c\u51fa\u3055\u308c\u308b\u30a8\u30e9\u30fc\u3067\u3042\u308a\u3001Java \u8a00\u8a9e\u306e\u6587\u6cd5\u306b\u8aa4\u308a\uff08\u69cb\u6587\u30a8\u30e9\u30fc\u3084\u578b\u30a8\u30e9\u30fc\uff09\u304c\u3042\u308b\u3053\u3068\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u3067\u304d\u306a\u3044\u5834\u5408\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u306e\u3053\u3068\u3002<\/span><\/p>\n\n\n\n<p>\u3053\u308c\u3082\u3088\u304f\u898b\u308b\u30a8\u30e9\u30fc\u3067\u3059\u306d\uff01<br>\u4ee5\u4e0b\u306e\u30dd\u30a4\u30f3\u30c8\u3092\u78ba\u8a8d\u3057\u3066\u4fee\u6b63\u3057\u3066\u518d\u30b3\u30f3\u30d1\u30a4\u30eb\u3059\u308b\u3053\u3068\u3067\u89e3\u6c7a\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u89e3\u6c7a\u7b56<\/strong><\/p>\n\n\n\n<p>\u30fb\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u9593\u9055\u3048\u3066\u3044\u308b<br>\u30fb\u3064\u3065\u308a\u3092\u9593\u9055\u3048\u3066\u3044\u308b<br>\u30fb\u884c\u672b\u306e ; \u304c\u629c\u3051\u3066\u3044\u308b<br>\u30fb . \u3068 , \u3084 ; \u3068 : \u306a\u3069\u306e\u8a18\u53f7\u3092\u9593\u9055\u3048\u3066\u3044\u308b<br>\u30fb\u958b\u304d\u30ab\u30c3\u30b3 ( { [ \u3068\u9589\u3058\u30ab\u30c3\u30b3 ) } ] \u306e\u6570\u304c\u3042\u3063\u3066\u3044\u306a\u3044\uff08\u958b\u3044\u305f\u30ab\u30c3\u30b3\u304c\u9589\u3058\u3066\u3044\u306a\u3044\uff09<br>\u30fb{ } ; \u306a\u3069\u306e\u8a18\u53f7\u304c\u5168\u89d2\u306b\u306a\u3063\u3066\u3044\u308b<br>\u30fb\u7a7a\u767d\u90e8\u5206\u306b\u5168\u89d2\u30b9\u30da\u30fc\u30b9\u3092\u5229\u7528\u3057\u3066\u3044\u308b<\/p>\n\n\n\n<p>\u203b\u30b3\u30f3\u30d1\u30a4\u30eb\u3068\u306f<br>\u30b3\u30f3\u30d1\u30a4\u30eb\u3068\u306f\u3001\u4eba\u9593\u304c\u4f5c\u6210\u3057\u305f\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u304c\u5b9f\u884c\u3067\u304d\u308b\u3088\u3046\u306b\u5909\u63db\u3059\u308b\u3053\u3068\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"aioseo-\">\u5b9f\u884c\u6642\u30a8\u30e9\u30fc<\/h3>\n\n\n\n<p>Java\u306e\u6587\u6cd5\u306b\u8aa4\u308a\u304c\u306a\u304f\u30b3\u30f3\u30d1\u30a4\u30eb\u306f\u901a\u308b\u304c\u3001\u4f7f\u3044\u65b9\u304c\u8aa4\u3063\u3066\u3044\u308b\u306a\u3069\u306e\u7406\u7531\u304b\u3089\u30d7\u30ed\u30b0\u30e9\u30e0\u5b9f\u884c\u6642\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u306e\u3053\u3068\u3002<\/p>\n\n\n\n<p>\u79c1\u304c\u906d\u9047\u3057\u305f\u5b9f\u884c\u6642\u30a8\u30e9\u30fc\u3092\u4eca\u56de\u306f3\u3064\u7d39\u4ecb\u3057\u307e\u3059\uff01<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"aioseo-nullpointerexception\"><strong>\u2460NullPointerException<\/strong><\/h4>\n\n\n\n<p>java\u306e\u4ee3\u8868\u30a8\u30e9\u30fc\u3068\u3057\u3066\u6319\u3052\u3089\u308c\u3001\u300c\u306c\u308b\u307d\u300d\u3068\u3088\u304f\u8a00\u308f\u308c\u308b\u30a8\u30e9\u30fc\u3067\u3059\u306d\uff01<br>\u53c2\u7167\u578b\u306e\u5909\u6570\u304cnull\u3092\u6307\u3057\u3066\u3044\u308b\u6642\u306b\u767a\u751f\u3059\u308b\u4f8b\u5916\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"719\" height=\"248\" src=\"https:\/\/www.miracleave.co.jp\/contents\/wp-content\/uploads\/2024\/01\/image-14.png\" alt=\"\" class=\"wp-image-2836\" srcset=\"https:\/\/www.miracleave.co.jp\/contents\/wp-content\/uploads\/2024\/01\/image-14.png 719w, https:\/\/www.miracleave.co.jp\/contents\/wp-content\/uploads\/2024\/01\/image-14-300x103.png 300w\" sizes=\"(max-width: 719px) 100vw, 719px\" \/><\/figure>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>\/\/\u51fa\u529b\u7d50\u679c\nException in thread &quot;main&quot; java.lang.NullPointerException: Cannot invoke &quot;String.length()&quot; because &quot;text&quot; is null\n\tat main.NullPointerExceptionExample.main(NullPointerExceptionExample.java:7)<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u4f8b\u3067\u306fnull\u306e\u5165\u3063\u305f\u5024\u30927\u884c\u76ee\u3067\u547c\u3073\u51fa\u3057\u3066\u3044\u308b\u3053\u3068\u3067\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\">\u89e3\u6c7a\u7b56<\/mark><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u751f\u6210\u3084\u5024\u306e\u8a2d\u5b9a\u304c\u6b63\u3057\u304f\u884c\u308f\u308c\u3066\u3044\u308b\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cnull\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u30bf\u30a4\u30df\u30f3\u30b0\u3092\u30c7\u30d0\u30c3\u30b0\u3067\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cnull\u304b\u3069\u3046\u304b\u306e\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3044\u3001\u30a8\u30e9\u30fc\u306e\u767a\u751f\u3092\u3067\u304d\u308b\u9650\u308a\u56de\u907f\u3059\u308b\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"aioseo-arrayindexoutofboundsexception\"><strong>\u2461ArrayIndexOutOfBoundsException<\/strong><\/h4>\n\n\n\n<p>\u914d\u5217\u306e\u7121\u52b9\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3057\u305f\u6642\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"774\" height=\"244\" src=\"https:\/\/www.miracleave.co.jp\/contents\/wp-content\/uploads\/2024\/01\/image-15.png\" alt=\"\" class=\"wp-image-2837\" srcset=\"https:\/\/www.miracleave.co.jp\/contents\/wp-content\/uploads\/2024\/01\/image-15.png 774w, https:\/\/www.miracleave.co.jp\/contents\/wp-content\/uploads\/2024\/01\/image-15-300x95.png 300w, https:\/\/www.miracleave.co.jp\/contents\/wp-content\/uploads\/2024\/01\/image-15-768x242.png 768w\" sizes=\"(max-width: 774px) 100vw, 774px\" \/><\/figure>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>\/\/\u51fa\u529b\u7d50\u679c\nException in thread &quot;main&quot; java.lang.ArrayIndexOutOfBoundsException: Index 5 out of bounds for length 3\n\tat main.ArrayIndexOutOfBoundsExceptionExample.main(ArrayIndexOutOfBoundsExceptionExample.java:7)<\/code><\/pre><\/div>\n\n\n\n<p>\u3053\u3053\u3067\u306f\u914d\u5217\u306e\u7bc4\u56f2\u5916\u3092\u6307\u5b9a\u3057\u3066\u3044\u308b\u305f\u3081\u30017\u884c\u76ee\u306b\u3066\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u3066\u3057\u307e\u3063\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<p>\u89e3\u6c7a\u7b56<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6b63\u3057\u3044\u914d\u5217\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6307\u5b9a\u3067\u304d\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u914d\u5217\u306e\u8a2d\u5b9a\u3092\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3067\u884c\u3063\u3066\u3044\u308b\u5834\u5408\u3001\u7e70\u308a\u8fd4\u3057\u56de\u6570\u306a\u3069\u306b\u554f\u984c\u304c\u306a\u3044\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"aioseo-classnotfoundexception\">\u2462ArithmeticException<\/h4>\n\n\n\n<p>\u6570\u5b66\u7684\u306b\u8a31\u3055\u308c\u3066\u3044\u306a\u3044\u8a08\u7b97\u3092\u884c\u3046\u3068\u3057\u305f\u3068\u304d\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"698\" height=\"199\" src=\"https:\/\/www.miracleave.co.jp\/contents\/wp-content\/uploads\/2024\/01\/image-16.png\" alt=\"\" class=\"wp-image-2839\" srcset=\"https:\/\/www.miracleave.co.jp\/contents\/wp-content\/uploads\/2024\/01\/image-16.png 698w, https:\/\/www.miracleave.co.jp\/contents\/wp-content\/uploads\/2024\/01\/image-16-300x86.png 300w\" sizes=\"(max-width: 698px) 100vw, 698px\" \/><\/figure>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>\/\/\u51fa\u529b\u7d50\u679c\nException in thread &quot;main&quot; java.lang.ArithmeticException: \/ by zero\n\tat main.ArithmeticExceptionExample.main(ArithmeticExceptionExample.java:6)<\/code><\/pre><\/div>\n\n\n\n<p>\u89e3\u6c7a\u7b56<\/p>\n\n\n\n<ul 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class=\"wp-block-heading\" id=\"aioseo-\">\u30a8\u30e9\u30fc\u306b\u906d\u9047\u3057\u305f\u3089<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" 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