{"id":4554,"date":"2024-03-14T13:21:59","date_gmt":"2024-03-14T04:21:59","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e6%96%87%e5%ad%97%e5%88%97%e3%81%ae%e7%89%b9%e5%ae%9a%e3%81%ae%e6%96%87%e5%ad%97%e3%82%92%e5%a4%89%e6%9b%b4%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99\/"},"modified":"2025-08-02T22:03:54","modified_gmt":"2025-08-02T13:03:54","slug":"java%e3%81%a7%e6%96%87%e5%ad%97%e5%88%97%e3%81%ae%e7%89%b9%e5%ae%9a%e3%81%ae%e6%96%87%e5%ad%97%e3%82%92%e5%a4%89%e6%9b%b4%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e6%96%87%e5%ad%97%e5%88%97%e3%81%ae%e7%89%b9%e5%ae%9a%e3%81%ae%e6%96%87%e5%ad%97%e3%82%92%e5%a4%89%e6%9b%b4%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99\/","title":{"rendered":"Java\u3067\u6587\u5b57\u5217\u306e\u7279\u5b9a\u306e\u6587\u5b57\u3092\u5909\u66f4\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"<p>Java\u3067\u306f\u3001\u6587\u5b57\u5217\u306f\u4e0d\u5909\u3067\u3042\u308a\u3001\u6587\u5b57\u5217\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3068\u6587\u5b57\u3092\u76f4\u63a5\u5909\u66f4\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001StringBuilder\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u306a\u3069\u3001\u3044\u304f\u3064\u304b\u306e\u65b9\u6cd5\u3067\u6587\u5b57\u5217\u306e\u7279\u5b9a\u306e\u6587\u5b57\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>StringBuilder\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3001\u6587\u5b57\u5217\u5185\u306e\u7279\u5b9a\u306e\u6587\u5b57\u3092\u5909\u66f4\u3059\u308b\u4f8b\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">str<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"Hello\"<\/span>;\r\n<span class=\"hljs-type\">StringBuilder<\/span> <span class=\"hljs-variable\">sb<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">StringBuilder<\/span>(str);\r\nsb.setCharAt(<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-string\">'a'<\/span>); <span class=\"hljs-comment\">\/\/ \u5c06\u5b57\u7b26\u4e32\u4e2d\u7d22\u5f15\u4e3a1\u7684\u5b57\u7b26\u4fee\u6539\u4e3a 'a'<\/span>\r\n<span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">newStr<\/span> <span class=\"hljs-operator\">=<\/span> sb.toString();\r\nSystem.out.println(newStr); <span class=\"hljs-comment\">\/\/ \u8f93\u51fa \"Hallo\"<\/span>\r\n<\/code><\/pre>\n<p>StringBuilder\u30af\u30e9\u30b9\u306esetCharAt\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u7279\u5b9a\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4f4d\u7f6e\u306e\u6587\u5b57\u3092\u5909\u66f4\u3067\u304d\u307e\u3059\u3002\u6700\u5f8c\u306btoString()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3067\u3001StringBuilder\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6587\u5b57\u5217\u306b\u5909\u63db\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306f\u3001\u6587\u5b57\u5217\u306f\u4e0d\u5909\u3067\u3042\u308a\u3001\u6587\u5b57\u5217\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3068\u6587\u5b57\u3092\u76f4\u63a5\u5909\u66f4\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001StringBuilder\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u306a\u3069\u3001\u3044\u304f\u3064\u304b\u306e\u65b9\u6cd5\u3067\u6587\u5b57\u5217\u306e\u7279\u5b9a\u306e\u6587\u5b57\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 S [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-4554","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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