{"id":845,"date":"2022-10-26T22:53:27","date_gmt":"2022-11-14T09:33:34","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%aestring%e9%85%8d%e5%88%97%e3%82%92string%e3%81%ab%e5%a4%89%e6%8f%9b%e3%81%99%e3%82%8b\/"},"modified":"2025-08-01T02:58:17","modified_gmt":"2025-07-31T17:58:17","slug":"java%e3%81%aestring%e9%85%8d%e5%88%97%e3%82%92string%e3%81%ab%e5%a4%89%e6%8f%9b%e3%81%99%e3%82%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aestring%e9%85%8d%e5%88%97%e3%82%92string%e3%81%ab%e5%a4%89%e6%8f%9b%e3%81%99%e3%82%8b\/","title":{"rendered":"Java\u306eString\u914d\u5217\u3092String\u306b\u5909\u63db\u3059\u308b"},"content":{"rendered":"<p>\u4eca\u65e5\u306f\u3001Java\u306eString\u914d\u5217\u3092String\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3059\u3002\u6642\u306b\u306f\u3001\u7279\u5b9a\u306e\u8981\u4ef6\u306b\u5408\u308f\u305b\u3066String\u914d\u5217\u3092String\u306b\u5909\u63db\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u914d\u5217\u306e\u4e2d\u8eab\u3092\u30ed\u30b0\u306b\u8a18\u9332\u3057\u305f\u3044\u5834\u5408\u3084\u3001String\u914d\u5217\u306e\u5024\u3092String\u306b\u5909\u63db\u3057\u3066\u4ed6\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306a\u3069\u3067\u3059\u3002<\/p>\n<h2>Java\u306eString\u914d\u5217\u3092String\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5<\/h2>\n<p>\u307b\u3068\u3093\u3069\u306e\u5834\u5408\u3001String\u306etoString()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u6587\u5b57\u5217\u8868\u73fe\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002\u3067\u306f\u3001Java\u3067String\u914d\u5217\u306etoString()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u305f\u5834\u5408\u306b\u4f55\u304c\u8d77\u3053\u308b\u304b\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.util;\r\n\r\npublic class JavaStringArrayToString {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tString[] strArr = new String[] {\"1\",\"2\",\"3\"};\r\n\t\t\r\n\t\tString str = strArr.toString();\r\n\t\t\r\n\t\tSystem.out.println(\"Java String array to String = \"+str);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u3088\u3063\u3066\u751f\u6210\u3055\u308c\u305f\u51fa\u529b\u304c\u4ee5\u4e0b\u306e\u753b\u50cf\u306b\u8868\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4e0a\u8a18\u306e\u51fa\u529b\u306e\u7406\u7531\u306f\u3001\u914d\u5217\u306b\u5bfe\u3057\u3066toString()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3068\u3001\u305d\u308c\u304c\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3055\u308c\u305fObject\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306b\u79fb\u884c\u3059\u308b\u305f\u3081\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\u6587\u5b57\u5217\u306b\u5909\u63db\u3059\u308b\u4f8b<\/h3>\n<p>Java\u3067String\u914d\u5217\u3092String\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306f\u3069\u3046\u3084\u308b\u306e\u304b\u3002\u500b\u3005\u306e\u8981\u7d20\u306btoString()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u3001Arrays.toString\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3001StringBuilder\u3092\u4f7f\u3063\u3066String\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>public static String toString(Object[] a) {\r\n    if (a == null)\r\n        return \"null\";\r\n\r\n    int iMax = a.length - 1;\r\n    if (iMax == -1)\r\n        return \"[]\";\r\n\r\n    StringBuilder b = new StringBuilder();\r\n    b.append('[');\r\n    for (int i = 0; ; i++) {\r\n        b.append(String.valueOf(a[i]));\r\n        if (i == iMax)\r\n            return b.append(']').toString();\r\n        b.append(\", \");\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u7279\u5b9a\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u8981\u4ef6\u304c\u3042\u308b\u5834\u5408\u3001String\u914d\u5217\u3092String\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306e\u72ec\u81ea\u306e\u65b9\u6cd5\u3082\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u3001\u3053\u308c\u3089\u306e\u65b9\u6cd5\u3092\u5b9f\u6f14\u3057\u3001\u751f\u6210\u3055\u308c\u305f\u51fa\u529b\u3092\u793a\u3059\u30b7\u30f3\u30d7\u30eb\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.util;\r\n\r\nimport java.util.Arrays;\r\n\r\npublic class JavaStringArrayToString {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tString[] strArr = new String[] { \"1\", \"2\", \"3\" };\r\n\r\n\t\tString str = Arrays.toString(strArr);\r\n\t\tSystem.out.println(\"Java String array to String = \" + str);\r\n\r\n\t\tstr = convertStringArrayToString(strArr, \",\");\r\n\t\tSystem.out.println(\"Convert Java String array to String = \" + str);\r\n\r\n\t}\r\n\r\n\tprivate static String convertStringArrayToString(String[] strArr, String delimiter) {\r\n\t\tStringBuilder sb = new StringBuilder();\r\n\t\tfor (String str : strArr)\r\n\t\t\tsb.append(str).append(delimiter);\r\n\t\treturn sb.substring(0, sb.length() - 1);\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\u914d\u5217\u306etoString()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u7121\u7528\u306a\u30c7\u30fc\u30bf\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002Java\u306eArrays\u30af\u30e9\u30b9\u306f\u3001\u914d\u5217\u306e\u8981\u7d20\u4e0a\u3067\u53cd\u5fa9\u51e6\u7406\u3092\u884c\u3044\u3001\u305d\u308c\u3089\u306etoString()\u5b9f\u88c5\u3092\u4f7f\u7528\u3057\u3066\u914d\u5217\u306e\u6587\u5b57\u5217\u8868\u73fe\u3092\u8fd4\u3059toString(Object[] objArr)\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u3053\u306e\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u914d\u5217\u306e\u5185\u5bb9\u304c\u5370\u5237\u3055\u308c\u3001\u30ed\u30b0\u51fa\u529b\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7279\u5b9a\u306e\u533a\u5207\u308a\u6587\u5b57\u3068\u5171\u306b\u6587\u5b57\u5217\u914d\u5217\u306e\u3059\u3079\u3066\u306e\u8981\u7d20\u3092\u7d50\u5408\u3057\u305f\u3044\u5834\u5408\u306f\u3001convertStringArrayToString(String[] strArr, String delimiter)\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u305d\u308c\u3089\u3092\u7d50\u5408\u3057\u305f\u5f8c\u306e\u6587\u5b57\u5217\u3092\u8fd4\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>Java\u306e\u914d\u5217\u3092\u6587\u5b57\u5217\u306b\u5909\u63db\u3059\u308b\u4f8b<\/h3>\n<p>\u3067\u306f\u3001\u4ed6\u306e\u30ab\u30b9\u30bf\u30e0\u30af\u30e9\u30b9\u3067\u3082\u4f7f\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u3001String\u914d\u5217\u3092\u62e1\u5f35\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u3053\u3061\u3089\u304c\u5b9f\u88c5\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.util;\r\n\r\nimport java.util.Arrays;\r\n\r\npublic class JavaArrayToString {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tA[] arr = { new A(\"1\"), new A(\"2\"), new A(\"3\") };\r\n\r\n\t\t\/\/ default toString() method\r\n\t\tSystem.out.println(arr.toString());\r\n\r\n\t\t\/\/ using Arrays.toString() for printing object array contents\r\n\t\tSystem.out.println(Arrays.toString(arr));\r\n\r\n\t\t\/\/ converting Object Array to String\r\n\t\tSystem.out.println(convertObjectArrayToString(arr, \",\"));\r\n\t}\r\n\r\n\tprivate static String convertObjectArrayToString(Object[] arr, String delimiter) {\r\n\t\tStringBuilder sb = new StringBuilder();\r\n\t\tfor (Object obj : arr)\r\n\t\t\tsb.append(obj.toString()).append(delimiter);\r\n\t\treturn sb.substring(0, sb.length() - 1);\r\n\r\n\t}\r\n\r\n}\r\n\r\nclass A {\r\n\tprivate String name;\r\n\r\n\tpublic A(String name) {\r\n\t\tthis.name = name;\r\n\t}\r\n\r\n\t@Override\r\n\tpublic String toString() {\r\n\t\tSystem.out.println(\"A toString() method called!!\");\r\n\t\treturn this.name;\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306eJava\u914d\u5217\u3092\u6587\u5b57\u5217\u306b\u5909\u63db\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u3088\u3063\u3066\u751f\u6210\u3055\u308c\u308b\u51fa\u529b\u306f\u3001\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>[Lcom.scdev.util.A;@7852e922\r\nA toString() method called!!\r\nA toString() method called!!\r\nA toString() method called!!\r\n[1, 2, 3]\r\nA toString() method called!!\r\nA toString() method called!!\r\nA toString() method called!!\r\n1,2,3\r\n<\/code><\/pre>\n<p>Java\u306eString\u914d\u5217\u3092String\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3066\u3001\u305d\u308c\u3092\u30ab\u30b9\u30bf\u30e0\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u3082\u9069\u7528\u3059\u308b\u65b9\u6cd5\u3092\u62e1\u5f35\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u304cJava\u914d\u5217\u3092String\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306e\u3059\u3079\u3066\u3067\u3059\u3002<\/p>\n<p>\u79c1\u305f\u3061\u306eGitHub\u30ea\u30dd\u30b8\u30c8\u30ea\u304b\u3089\u3082\u3063\u3068\u591a\u304f\u306e\u30b3\u30a2Java\u306e\u4f8b\u3092\u30c1\u30a7\u30c3\u30af\u30a2\u30a6\u30c8\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u53c2\u7167\uff1aJava\u306e\u914d\u5217toString API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4eca\u65e5\u306f\u3001Java\u306eString\u914d\u5217\u3092String\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3059\u3002\u6642\u306b\u306f\u3001\u7279\u5b9a\u306e\u8981\u4ef6\u306b\u5408\u308f\u305b\u3066String\u914d\u5217\u3092String\u306b\u5909\u63db\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u914d\u5217\u306e\u4e2d\u8eab\u3092\u30ed\u30b0\u306b\u8a18\u9332\u3057\u305f\u3044\u5834\u5408\u3084\u3001S [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-845","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) - 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