{"id":17295,"date":"2024-03-16T06:24:44","date_gmt":"2024-03-15T21:24:44","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%81%ae%e3%82%af%e3%82%a4%e3%83%83%e3%82%af%e3%82%bd%e3%83%bc%e3%83%88%e3%82%a2%e3%83%ab%e3%82%b4%e3%83%aa%e3%82%ba%e3%83%a0%e3%81%ae%e3%82%b3%e3%83%bc%e3%83%89%e3%82%92%e6%9b%b8\/"},"modified":"2025-08-06T11:11:41","modified_gmt":"2025-08-06T02:11:41","slug":"java%e3%81%a7%e3%81%ae%e3%82%af%e3%82%a4%e3%83%83%e3%82%af%e3%82%bd%e3%83%bc%e3%83%88%e3%82%a2%e3%83%ab%e3%82%b4%e3%83%aa%e3%82%ba%e3%83%a0%e3%81%ae%e3%82%b3%e3%83%bc%e3%83%89%e3%82%92%e6%9b%b8","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%81%ae%e3%82%af%e3%82%a4%e3%83%83%e3%82%af%e3%82%bd%e3%83%bc%e3%83%88%e3%82%a2%e3%83%ab%e3%82%b4%e3%83%aa%e3%82%ba%e3%83%a0%e3%81%ae%e3%82%b3%e3%83%bc%e3%83%89%e3%82%92%e6%9b%b8\/","title":{"rendered":"Java\u3067\u306e\u30af\u30a4\u30c3\u30af\u30bd\u30fc\u30c8\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"<p>Java\u30b3\u30fc\u30c9\u3067\u30af\u30a4\u30c3\u30af\u30bd\u30fc\u30c8\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u304c\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">QuickSort<\/span> {\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n        <span class=\"hljs-type\">int<\/span>[] nums = {<span class=\"hljs-number\">5<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">8<\/span>, <span class=\"hljs-number\">9<\/span>, <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">7<\/span>};\r\n        quickSort(nums, <span class=\"hljs-number\">0<\/span>, nums.length - <span class=\"hljs-number\">1<\/span>);\r\n        <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> num : nums) {\r\n            System.out.print(num + <span class=\"hljs-string\">\" \"<\/span>);\r\n        }\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">quickSort<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span>[] nums, <span class=\"hljs-type\">int<\/span> left, <span class=\"hljs-type\">int<\/span> right)<\/span> {\r\n        <span class=\"hljs-keyword\">if<\/span> (left &lt; right) {\r\n            <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">pivotIndex<\/span> <span class=\"hljs-operator\">=<\/span> partition(nums, left, right);\r\n            quickSort(nums, left, pivotIndex - <span class=\"hljs-number\">1<\/span>);\r\n            quickSort(nums, pivotIndex + <span class=\"hljs-number\">1<\/span>, right);\r\n        }\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">partition<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span>[] nums, <span class=\"hljs-type\">int<\/span> left, <span class=\"hljs-type\">int<\/span> right)<\/span> {\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">pivot<\/span> <span class=\"hljs-operator\">=<\/span> nums[right];\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">i<\/span> <span class=\"hljs-operator\">=<\/span> left - <span class=\"hljs-number\">1<\/span>;\r\n        <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">j<\/span> <span class=\"hljs-operator\">=<\/span> left; j &lt; right; j++) {\r\n            <span class=\"hljs-keyword\">if<\/span> (nums[j] &lt;= pivot) {\r\n                i++;\r\n                swap(nums, i, j);\r\n            }\r\n        }\r\n        swap(nums, i + <span class=\"hljs-number\">1<\/span>, right);\r\n        <span class=\"hljs-keyword\">return<\/span> i + <span class=\"hljs-number\">1<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">swap<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span>[] nums, <span class=\"hljs-type\">int<\/span> i, <span class=\"hljs-type\">int<\/span> j)<\/span> {\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">temp<\/span> <span class=\"hljs-operator\">=<\/span> nums[i];\r\n        nums[i] = nums[j];\r\n        nums[j] = temp;\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u306f\u30af\u30a4\u30c3\u30af\u30bd\u30fc\u30c8\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5b9f\u73fe\u3057\u3066\u3044\u307e\u3059\u3002\u6700\u521d\u306b\u3001\u30e1\u30a4\u30f3\u95a2\u6570\u3067\u30bd\u30fc\u30c8\u3059\u308b\u914d\u5217nums\u3092\u5b9a\u7fa9\u3057\u3001quickSort\u95a2\u6570\u3092\u547c\u3073\u51fa\u3057\u3066\u30bd\u30fc\u30c8\u3057\u307e\u3059\u3002quickSort\u95a2\u6570\u306f\u518d\u5e30\u7684\u306b\u30af\u30a4\u30c3\u30af\u30bd\u30fc\u30c8\u3092\u884c\u3044\u3001partition\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u30d4\u30dc\u30c3\u30c8\u8981\u7d20\u306e\u4f4d\u7f6e\u3092\u6c7a\u5b9a\u3057\u3001\u914d\u5217\u30922\u3064\u306e\u30b5\u30d6\u914d\u5217\u306b\u5206\u5272\u3057\u307e\u3059\u3002partition\u95a2\u6570\u306f\u3001\u53f3\u7aef\u306e\u8981\u7d20\u3092\u30d4\u30dc\u30c3\u30c8\u8981\u7d20\u3068\u3057\u3066\u9078\u629e\u3057\u3001\u914d\u5217\u3092\u8d70\u67fb\u3057\u3066\u3001\u30d4\u30dc\u30c3\u30c8\u8981\u7d20\u4ee5\u4e0b\u306e\u8981\u7d20\u3092\u5de6\u5074\u306b\u4ea4\u63db\u3057\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001\u30d4\u30dc\u30c3\u30c8\u8981\u7d20\u3068\u5de6\u5074\u306e\u30b5\u30d6\u914d\u5217\u306e\u6700\u5f8c\u306e\u8981\u7d20\u3092\u4ea4\u63db\u3057\u3001\u30d4\u30dc\u30c3\u30c8\u8981\u7d20\u306e\u4f4d\u7f6e\u3092\u8fd4\u3057\u307e\u3059\u3002swap\u95a2\u6570\u306f\u914d\u5217\u5185\u306e2\u3064\u306e\u8981\u7d20\u306e\u4f4d\u7f6e\u3092\u4ea4\u63db\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u6700\u7d42\u7684\u306b\u3001\u30bd\u30fc\u30c8\u304c\u5b8c\u4e86\u3057\u305f\u5f8c\u3001\u30bd\u30fc\u30c8\u3055\u308c\u305f\u914d\u5217\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u30b3\u30fc\u30c9\u3067\u30af\u30a4\u30c3\u30af\u30bd\u30fc\u30c8\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u304c\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002 public class QuickSort { public static void main(String[] args) { int[]  [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-17295","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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