{"id":865,"date":"2023-08-25T08:47:10","date_gmt":"2022-10-28T23:43:52","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%ae%e6%96%87%e5%ad%97%e5%88%97%e3%81%ae%e9%85%8d%e5%88%97\/"},"modified":"2025-08-01T03:07:26","modified_gmt":"2025-07-31T18:07:26","slug":"java%e3%81%ae%e6%96%87%e5%ad%97%e5%88%97%e3%81%ae%e9%85%8d%e5%88%97","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ae%e6%96%87%e5%ad%97%e5%88%97%e3%81%ae%e9%85%8d%e5%88%97\/","title":{"rendered":"Java\u306e\u6587\u5b57\u5217\u306e\u914d\u5217"},"content":{"rendered":"<p>Java\u306eString\u914d\u5217\u306f\u3001\u56fa\u5b9a\u6570\u306e\u6587\u5b57\u5217\u3092\u4fdd\u6301\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u7279\u306b\u3001Java\u306e\u521d\u5fc3\u8005\u3084\u7279\u5b9a\u306e\u30b7\u30ca\u30ea\u30aa\u3092\u30c6\u30b9\u30c8\u3059\u308b\u305f\u3081\u306b\u3001String\u914d\u5217\u306f\u975e\u5e38\u306b\u4e00\u822c\u7684\u3067\u3059\u3002\u5b9f\u969b\u3001Java\u306emain\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u3082String\u914d\u5217\u3067\u3059\uff08public static void main(String[] args)\uff09\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u4eca\u65e5\u306f\u4f8b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f7f\u3063\u3066\u3001Java\u306eString\u914d\u5217\u306e\u3055\u307e\u3056\u307e\u306a\u5074\u9762\u306b\u3064\u3044\u3066\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul class=\"post-ul\">\n<li>Java String array is basically an array of objects.<\/li>\n<li>There are two ways to declare string array &#8211; declaration without size and declare with size.<\/li>\n<li>There are two ways to initialize string array &#8211; at the time of declaration, populating values after declaration.<\/li>\n<li>We can do different kind of processing on string array such as iteration, sorting, searching etc.<\/li>\n<\/ul>\n<p>\u3055\u3042\u3001Java\u306e\u6587\u5b57\u5217\u914d\u5217\u306e\u4f8b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>Java\u3067\u306e\u6587\u5b57\u5217\u914d\u5217\u306e\u5ba3\u8a00<\/h3>\n<p>\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u30b9\u30cb\u30da\u30c3\u30c8\u3067\u306f\u3001Java\u3067\u306e\u6587\u5b57\u5217\u914d\u5217\u306e\u5ba3\u8a00\u306e\u7570\u306a\u308b\u65b9\u6cd5\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>String[] strArray; \/\/declare without size\r\n\r\nString[] strArray1 = new String[3]; \/\/declare with size\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306f\u3001\u6587\u5b57\u5217\u306e\u914d\u5217\u3092String strArray[]\u3068\u66f8\u304f\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u304c\u3001\u4e0a\u8a18\u306e\u65b9\u6cd5\u304c\u6a19\u6e96\u3067\u63a8\u5968\u3055\u308c\u308b\u65b9\u6cd5\u3067\u3059\u3002\u307e\u305f\u3001\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001strArray\u306fnull\u3067\u3059\u304c\u3001strArray1\u306e\u5024\u306f[null, null, null]\u3067\u3059\u3002<\/p>\n<h3>Java\u306eString\u578b\u306e\u914d\u5217\u306e\u521d\u671f\u5316<\/h3>\n<p>Java\u3067\u6587\u5b57\u5217\u914d\u5217\u3092\u521d\u671f\u5316\u3059\u308b\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code>\/\/inline initialization\r\nString[] strArray1 = new String[] {\"A\",\"B\",\"C\"};\r\nString[] strArray2 = {\"A\",\"B\",\"C\"}; \r\n\r\n\/\/initialization after declaration\r\nString[] strArray3 = new String[3];\r\nstrArray3[0] = \"A\";\r\nstrArray3[1] = \"B\";\r\nstrArray3[2] = \"C\";\r\n<\/code><\/pre>\n<p>\u3059\u3079\u3066\u306e\uff13\u3064\u306e\u6587\u5b57\u5217\u914d\u5217\u306f\u540c\u3058\u5024\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u305d\u308c\u3089\u306b\u5bfe\u3057\u3066equals\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3068\u3001false\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>System.out.println(strArray1.equals(strArray2)); \/\/ false\r\nSystem.out.println(Arrays.toString(strArray1).equals(Arrays.toString(strArray2)));\/\/ true\r\n<\/code><\/pre>\n<p>\u7406\u7531\u306f\u3001\u914d\u5217\u304c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3042\u308a\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30af\u30e9\u30b9\u304c\u4ee5\u4e0b\u306e\u3088\u3046\u306aequals()\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3057\u3066\u3044\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>public boolean equals(Object obj) {\r\n        return (this == obj);\r\n    }\r\n<\/code><\/pre>\n<p>2\u756a\u76ee\u306e\u6587\u306f\u3001\u5024\u3092\u6587\u5b57\u5217\u306b\u5909\u63db\u3059\u308b\u3068\u5024\u304c\u540c\u3058\u3067\u3042\u308a\u3001String\u30af\u30e9\u30b9\u306eequals()\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3067\u5024\u304c\u78ba\u8a8d\u3055\u308c\u308b\u305f\u3081\u3001\u771f\u3067\u3059\u3002\u8a73\u7d30\u306b\u3064\u3044\u3066\u306f\u3001String\u30af\u30e9\u30b9\u306eAPI\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u3054\u78ba\u8a8d\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>Java\u306e\u6587\u5b57\u5217\u914d\u5217\u3092\u7e70\u308a\u8fd4\u3059<\/h3>\n<p>\u79c1\u305f\u3061\u306fJava\u306efor\u30eb\u30fc\u30d7\u307e\u305f\u306fJava\u306eforeach\u30eb\u30fc\u30d7\u3092\u4f7f\u7528\u3057\u3066\u3001\u6587\u5b57\u5217\u306e\u914d\u5217\u3092\u53cd\u5fa9\u51e6\u7406\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>String[] strArray2 = {\"A\",\"B\",\"C\"}; \r\nfor (int i = 0; i &lt; strArray2.length; i++) {\r\n\tSystem.out.print(strArray2[i]);\r\n}\r\n\r\nfor (String str : strArray2) {\r\n\tSystem.out.print(str);\r\n}\r\n<\/code><\/pre>\n<h3>\u6587\u5b57\u5217\u306e\u914d\u5217\u5185\u3067\u6587\u5b57\u5217\u3092\u691c\u7d22\u3059\u308b<\/h3>\n<p>\u4ee5\u4e0b\u306f\u3001\u914d\u5217\u5185\u3067\u6587\u5b57\u5217\u3092\u691c\u7d22\u3059\u308b\u305f\u3081\u306b for \u30eb\u30fc\u30d7\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u306f\u305d\u308c\u306b\u95a2\u3059\u308b\u5358\u7d14\u306a\u4f8b\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.stringarray;\r\n\r\npublic class JavaStringArrayExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tString[] strArray = { \"A\", \"B\", \"C\" };\r\n\t\t\r\n\t\tboolean found = false;\r\n\t\tint index = 0;\r\n\t\tString s = \"B\";\r\n\t\tfor (int i = 0; i &lt; strArray.length; i++) {\r\n\t\t\tif(s.equals(strArray[i])) {\r\n\t\t\t\tindex = i; found = true; break;\r\n\t\t\t}\r\n\t\t}\r\n\t\tif(found)\r\n\t\t\tSystem.out.println(s +\" found at index \"+index);\r\n\t\telse\r\n\t\t\tSystem.out.println(s +\" not found in the array\");\r\n\t\t\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u6587\u5b57\u5217\u3092\u898b\u3064\u3051\u305f\u3089\u3001\u30eb\u30fc\u30d7\u304b\u3089\u3059\u3050\u306b\u629c\u3051\u308b\u305f\u3081\u306b\u300cbreak\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u4f7f\u7528\u306b\u6ce8\u76ee\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>Java\u306e\u6587\u5b57\u5217\u914d\u5217\u306e\u30bd\u30fc\u30c8<\/h3>\n<p>\u79c1\u305f\u3061\u306f\u72ec\u81ea\u306e\u30bd\u30fc\u30c8\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3057\u3001Arrays\u30af\u30e9\u30b9\u306e\u30bd\u30fc\u30c8\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>String[] vowels = {\"a\",\"i\",\"u\",\"e\",\"o\"};\r\n\t\t\r\nSystem.out.println(\"Before sorting \"+Arrays.toString(vowels));\r\n\r\nArrays.sort(vowels);\r\n\t\t\r\nSystem.out.println(\"After sorting \"+Arrays.toString(vowels));\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u30b9\u30cb\u30da\u30c3\u30c8\u306e\u51fa\u529b\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>Before sorting [a, i, u, e, o]\r\nAfter sorting [a, e, i, o, u]\r\n<\/code><\/pre>\n<p>String\u306fComparable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u81ea\u7136\u306a\u4e26\u3073\u66ff\u3048\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3082\u3057\u4ed6\u306e\u65b9\u6cd5\u3067\u30bd\u30fc\u30c8\u3057\u305f\u3044\u5834\u5408\u306f\u3001Comparator\u3092\u6e21\u3059\u3053\u3068\u3067Arrays.sort()\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002Java\u306eComparable\u3068Comparator\u3067\u3053\u308c\u3089\u306e\u30bd\u30fc\u30c8\u6280\u8853\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u300cString\u300d\u3092\u300cString Array\u300d\u306b\u5909\u63db\u3059\u308b\u3002<\/h3>\n<p>split()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001String\u3092\u6587\u5b57\u914d\u5217\u306b\u5909\u63db\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30c7\u30ea\u30df\u30bf\u6587\u5b57\u3092\u4f7f\u7528\u3057\u3066\u5024\u304c\u533a\u5207\u3089\u308c\u305f\u5358\u4e00\u306e\u6587\u5b57\u5217\u304c\u5165\u529b\u3055\u308c\u305f\u5834\u5408\u306b\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>String str = \"a,e,i,o,u\";\r\nString[] vowels = str.split(\",\");\r\nSystem.out.println(Arrays.toString(vowels)); \/\/[a, e, i, o, u]\r\n<\/code><\/pre>\n<h3>\u6587\u5b57\u5217\u306e\u914d\u5217\u3092\u6587\u5b57\u5217\u306b\u5909\u63db\u3059\u308b<\/h3>\n<p>String\u914d\u5217\u3092String\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306b\u306f\u3001Arrays.toString()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u914d\u5217\u81ea\u4f53\u306ftoString()\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3057\u3066\u3044\u306a\u3044\u305f\u3081\u3001\u6587\u5b57\u5217\u8868\u73fe\u3092\u53d6\u5f97\u3059\u308b\u5834\u5408\u306fArrays\u30af\u30e9\u30b9\u306b\u983c\u308b\u304b\u3001\u72ec\u81ea\u306e\u30ab\u30b9\u30bf\u30e0\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>String[] vowels = { \"a\", \"e\", \"i\", \"o\", \"u\" };\r\nSystem.out.println(vowels);\r\nSystem.out.println(Arrays.toString(vowels));\r\n<\/code><\/pre>\n<p>\u51fa\u529b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>[Ljava.lang.String;@3d04a311\r\n[a, e, i, o, u]\r\n<\/code><\/pre>\n<p>\u6700\u521d\u306e\u51fa\u529b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306bObject\u30af\u30e9\u30b9\u306etoString()\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u306b\u3088\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>public String toString() {\r\n        return getClass().getName() + \"@\" + Integer.toHexString(hashCode());\r\n    }\r\n<\/code><\/pre>\n<h3>Java\u306eString\u914d\u5217\u3092\u30ea\u30b9\u30c8\u306b\u5909\u63db\u3057\u307e\u3059\u3002<\/h3>\n<p>Arrays.toList()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u6587\u5b57\u5217\u914d\u5217\u306e\u30ea\u30b9\u30c8\u8868\u73fe\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u306a\u304a\u3001\u3053\u306e\u30ea\u30b9\u30c8\u306f\u914d\u5217\u306b\u3088\u3063\u3066\u88cf\u4ed8\u3051\u3089\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u69cb\u9020\u7684\u306a\u5909\u66f4\u3092\u52a0\u3048\u308b\u3068java.lang.UnsupportedOperationException\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>String[] vowels = { \"a\", \"e\", \"i\", \"o\", \"u\", \"a\", \"o\" };\r\n\r\nList&lt;String&gt; vowelsList = Arrays.asList(vowels);\r\nSystem.out.println(\"vowelsList = \"+vowelsList);\r\n\/\/vowelsList.add(\"x\"); \/\/java.lang.UnsupportedOperationException\r\n\r\nvowelsList.set(0, \"x\"); \/\/allowed because no structural modification\r\nSystem.out.println(\"vowelsList = \"+vowelsList);\r\n<\/code><\/pre>\n<p>Java\u306e\u6587\u5b57\u5217\u914d\u5217\u306f\u4ee5\u4e0a\u3067\u3059\u3002\u53c2\u8003\uff1a\u914d\u5217Oracle\u30c9\u30ad\u30e5\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306eString\u914d\u5217\u306f\u3001\u56fa\u5b9a\u6570\u306e\u6587\u5b57\u5217\u3092\u4fdd\u6301\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u7279\u306b\u3001Java\u306e\u521d\u5fc3\u8005\u3084\u7279\u5b9a\u306e\u30b7\u30ca\u30ea\u30aa\u3092\u30c6\u30b9\u30c8\u3059\u308b\u305f\u3081\u306b\u3001String\u914d\u5217\u306f\u975e\u5e38\u306b\u4e00\u822c\u7684\u3067\u3059\u3002\u5b9f\u969b\u3001Java\u306emain\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u3082String [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-865","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java\u306e\u6587\u5b57\u5217\u306e\u914d\u5217 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Java\u306e\u6587\u5b57\u5217\u306e\u914d\u5217\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, 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