{"id":127887,"date":"2024-03-25T04:20:24","date_gmt":"2024-03-24T19:20:24","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%83%91%e3%82%b9%e3%83%95%e3%82%a1%e3%82%a4%e3%83%b3%e3%83%87%e3%82%a3%e3%83%b3%e3%82%b0%e3%82%a2%e3%83%ab%e3%82%b4%e3%83%aa%e3%82%ba%e3%83%a0%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%99\/"},"modified":"2024-03-27T19:02:28","modified_gmt":"2024-03-27T10:02:28","slug":"java%e3%81%a7%e3%83%91%e3%82%b9%e3%83%95%e3%82%a1%e3%82%a4%e3%83%b3%e3%83%87%e3%82%a3%e3%83%b3%e3%82%b0%e3%82%a2%e3%83%ab%e3%82%b4%e3%83%aa%e3%82%ba%e3%83%a0%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%99","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%83%91%e3%82%b9%e3%83%95%e3%82%a1%e3%82%a4%e3%83%b3%e3%83%87%e3%82%a3%e3%83%b3%e3%82%b0%e3%82%a2%e3%83%ab%e3%82%b4%e3%83%aa%e3%82%ba%e3%83%a0%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%99\/","title":{"rendered":"Java\u3067\u30d1\u30b9\u30d5\u30a1\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>\u7d4c\u8def\u63a2\u7d22\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u3001 Java \u3067\u306f\u30b0\u30e9\u30d5\u63a2\u7d22\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u7528\u3044\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002 \u4ee5\u4e0b\u306b\u3001\u5e45\u512a\u5148\u63a2\u7d22 (BFS) \u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u7528\u3044\u305f\u7d4c\u8def\u63a2\u7d22\u306e\u7c21\u5358\u306a\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.util.*;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">PathFinding<\/span> {\r\n<span class=\"hljs-comment\">\/\/ \u5b9a\u4e49\u56fe\u7684\u5927\u5c0f<\/span>\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">final<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">ROW<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">5<\/span>;\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">final<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">COL<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">5<\/span>;\r\n<span class=\"hljs-comment\">\/\/ \u5b9a\u4e49\u56fe\u7684\u8282\u70b9<\/span>\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">Node<\/span> {\r\n<span class=\"hljs-type\">int<\/span> x;\r\n<span class=\"hljs-type\">int<\/span> y;\r\nNode parent;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title function_\">Node<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> x, <span class=\"hljs-type\">int<\/span> y, Node parent)<\/span> {\r\n<span class=\"hljs-built_in\">this<\/span>.x = x;\r\n<span class=\"hljs-built_in\">this<\/span>.y = y;\r\n<span class=\"hljs-built_in\">this<\/span>.parent = parent;\r\n}\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u5b9a\u4e49\u53ef\u79fb\u52a8\u7684\u65b9\u5411<\/span>\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">final<\/span> <span class=\"hljs-type\">int<\/span>[][] DIRECTIONS = {{-<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">0<\/span>}, {<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">0<\/span>}, {<span class=\"hljs-number\">0<\/span>, -<span class=\"hljs-number\">1<\/span>}, {<span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">1<\/span>}};\r\n<span class=\"hljs-comment\">\/\/ \u5224\u65ad\u70b9\u662f\u5426\u5728\u56fe\u5185<\/span>\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">boolean<\/span> <span class=\"hljs-title function_\">isValid<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> x, <span class=\"hljs-type\">int<\/span> y)<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> x &gt;= <span class=\"hljs-number\">0<\/span> &amp;&amp; x &lt; ROW &amp;&amp; y &gt;= <span class=\"hljs-number\">0<\/span> &amp;&amp; y &lt; COL;\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u5224\u65ad\u70b9\u662f\u5426\u4e3a\u969c\u788d\u7269\uff081\u8868\u793a\u969c\u788d\u7269\uff09<\/span>\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">boolean<\/span> <span class=\"hljs-title function_\">isObstacle<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span>[][] grid, <span class=\"hljs-type\">int<\/span> x, <span class=\"hljs-type\">int<\/span> y)<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> grid[x][y] == <span class=\"hljs-number\">1<\/span>;\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u5bfb\u627e\u8def\u5f84<\/span>\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> List&lt;Node&gt; <span class=\"hljs-title function_\">findPath<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span>[][] grid, Node start, Node end)<\/span> {\r\nList&lt;Node&gt; path = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ArrayList<\/span>&lt;&gt;();\r\n<span class=\"hljs-comment\">\/\/ \u4f7f\u7528BFS\u7b97\u6cd5<\/span>\r\nQueue&lt;Node&gt; queue = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">LinkedList<\/span>&lt;&gt;();\r\nqueue.offer(start);\r\n<span class=\"hljs-type\">boolean<\/span>[][] visited = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">boolean<\/span>[ROW][COL];\r\nvisited[start.x][start.y] = <span class=\"hljs-literal\">true<\/span>;\r\n<span class=\"hljs-keyword\">while<\/span> (!queue.isEmpty()) {\r\n<span class=\"hljs-type\">Node<\/span> <span class=\"hljs-variable\">curr<\/span> <span class=\"hljs-operator\">=<\/span> queue.poll();\r\n<span class=\"hljs-keyword\">if<\/span> (curr.x == end.x &amp;&amp; curr.y == end.y) {\r\n<span class=\"hljs-comment\">\/\/ \u627e\u5230\u76ee\u6807\u8282\u70b9\uff0c\u6784\u5efa\u8def\u5f84<\/span>\r\n<span class=\"hljs-keyword\">while<\/span> (curr != <span class=\"hljs-literal\">null<\/span>) {\r\npath.add(<span class=\"hljs-number\">0<\/span>, curr);\r\ncurr = curr.parent;\r\n}\r\n<span class=\"hljs-keyword\">break<\/span>;\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u904d\u5386\u53ef\u79fb\u52a8\u7684\u65b9\u5411<\/span>\r\n<span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span>[] direction : DIRECTIONS) {\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">newX<\/span> <span class=\"hljs-operator\">=<\/span> curr.x + direction[<span class=\"hljs-number\">0<\/span>];\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">newY<\/span> <span class=\"hljs-operator\">=<\/span> curr.y + direction[<span class=\"hljs-number\">1<\/span>];\r\n<span class=\"hljs-keyword\">if<\/span> (isValid(newX, newY) &amp;&amp; !isObstacle(grid, newX, newY) &amp;&amp; !visited[newX][newY]) {\r\n<span class=\"hljs-type\">Node<\/span> <span class=\"hljs-variable\">next<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Node<\/span>(newX, newY, curr);\r\nqueue.offer(next);\r\nvisited[newX][newY] = <span class=\"hljs-literal\">true<\/span>;\r\n}\r\n}\r\n}\r\n<span class=\"hljs-keyword\">return<\/span> path;\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_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n<span class=\"hljs-comment\">\/\/ \u5b9a\u4e49\u4e00\u4e2a\u793a\u4f8b\u5730\u56fe<\/span>\r\n<span class=\"hljs-type\">int<\/span>[][] grid = {\r\n{<span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>},\r\n{<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">0<\/span>},\r\n{<span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>},\r\n{<span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">1<\/span>},\r\n{<span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>}\r\n};\r\n<span class=\"hljs-type\">Node<\/span> <span class=\"hljs-variable\">start<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Node<\/span>(<span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-literal\">null<\/span>);\r\n<span class=\"hljs-type\">Node<\/span> <span class=\"hljs-variable\">end<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Node<\/span>(<span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">4<\/span>, <span class=\"hljs-literal\">null<\/span>);\r\nList&lt;Node&gt; path = findPath(grid, start, end);\r\n<span class=\"hljs-keyword\">if<\/span> (path.isEmpty()) {\r\nSystem.out.println(<span class=\"hljs-string\">\"No path found.\"<\/span>);\r\n} <span class=\"hljs-keyword\">else<\/span> {\r\nSystem.out.println(<span class=\"hljs-string\">\"Path found:\"<\/span>);\r\n<span class=\"hljs-keyword\">for<\/span> (Node node : path) {\r\nSystem.out.println(<span class=\"hljs-string\">\"(\"<\/span> + node.x + <span class=\"hljs-string\">\", \"<\/span> + node.y + <span class=\"hljs-string\">\")\"<\/span>);\r\n}\r\n}\r\n}\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001\u30de\u30c3\u30d7\u3092\u8868\u73fe\u3059\u308b\u305f\u3081\u306b2\u6b21\u5143\u914d\u5217\u3092\u4f7f\u7528\u3057\u30010\u306f\u901a\u884c\u53ef\u80fd\u306a\u9818\u57df\u30011\u306f\u969c\u5bb3\u7269\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002findPath\u30e1\u30bd\u30c3\u30c9\u306f\u3001BFS\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u4f7f\u7528\u3057\u3066\u7d4c\u8def\u3092\u63a2\u3057\u3001\u30ce\u30fc\u30c9\u306e\u30ea\u30b9\u30c8\u3092\u8fd4\u3057\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001main\u30e1\u30bd\u30c3\u30c9\u3067\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3057\u3001\u898b\u3064\u304b\u3063\u305f\u7d4c\u8def\u3092\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7d4c\u8def\u63a2\u7d22\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u3001 Java \u3067\u306f\u30b0\u30e9\u30d5\u63a2\u7d22\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u7528\u3044\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002 \u4ee5\u4e0b\u306b\u3001\u5e45\u512a\u5148\u63a2\u7d22 (BFS) \u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u7528\u3044\u305f\u7d4c\u8def\u63a2\u7d22\u306e\u7c21\u5358\u306a\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002 import java.util.*; public [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-127887","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"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\u3067\u30d1\u30b9\u30d5\u30a1\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u3067\u30d1\u30b9\u30d5\u30a1\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5b9f\u88c5\u3059\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u3067\u30d1\u30b9\u30d5\u30a1\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"\u7d4c\u8def\u63a2\u7d22\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u3001 Java \u3067\u306f\u30b0\u30e9\u30d5\u63a2\u7d22\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u7528\u3044\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002 \u4ee5\u4e0b\u306b\u3001\u5e45\u512a\u5148\u63a2\u7d22 (BFS) \u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u7528\u3044\u305f\u7d4c\u8def\u63a2\u7d22\u306e\u7c21\u5358\u306a\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002 import java.util.*; public [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u3067\u30d1\u30b9\u30d5\u30a1\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5b9f\u88c5\u3059\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-24T19:20:24+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-27T10:02:28+00:00\" \/>\n<meta name=\"author\" content=\"\u590f\u6a39, \u98a8\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta 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