{"id":630,"date":"2023-01-05T17:57:54","date_gmt":"2023-02-01T06:42:23","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%a7%e4%ba%8c%e5%88%86%e6%9c%a8%e3%81%ae%e5%b9%85%e5%84%aa%e5%85%88%e6%8e%a2%e7%b4%a2%ef%bc%88bfs%ef%bc%89%e3%81%a8%e6%b7%b1%e3%81%95%e5%84%aa%e5%85%88%e6%8e%a2%e7%b4%a2%ef%bc%88dfs%ef%bc%89\/"},"modified":"2025-08-01T01:13:00","modified_gmt":"2025-07-31T16:13:00","slug":"java%e3%81%a7%e4%ba%8c%e5%88%86%e6%9c%a8%e3%81%ae%e5%b9%85%e5%84%aa%e5%85%88%e6%8e%a2%e7%b4%a2%ef%bc%88bfs%ef%bc%89%e3%81%a8%e6%b7%b1%e3%81%95%e5%84%aa%e5%85%88%e6%8e%a2%e7%b4%a2%ef%bc%88dfs%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e4%ba%8c%e5%88%86%e6%9c%a8%e3%81%ae%e5%b9%85%e5%84%aa%e5%85%88%e6%8e%a2%e7%b4%a2%ef%bc%88bfs%ef%bc%89%e3%81%a8%e6%b7%b1%e3%81%95%e5%84%aa%e5%85%88%e6%8e%a2%e7%b4%a2%ef%bc%88dfs%ef%bc%89\/","title":{"rendered":"Java\u3067\u4e8c\u5206\u6728\u306e\u5e45\u512a\u5148\u63a2\u7d22\uff08BFS\uff09\u3068\u6df1\u3055\u512a\u5148\u63a2\u7d22\uff08DFS\uff09"},"content":{"rendered":"

\u5e45\u512a\u5148\u63a2\u7d22\uff08Breadth-First Search\uff09\u3068\u6df1\u3055\u512a\u5148\u63a2\u7d22\uff08Depth-First Search\uff09\u306f\u3001\u30b0\u30e9\u30d5\u3084\u6728\u3092\u63a2\u7d22\u3059\u308b\u305f\u3081\u306e\u4e8c\u3064\u306e\u624b\u6cd5\u3067\u3059\u3002\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001\u4e3b\u306b\u6728\u306b\u304a\u3051\u308bBFS\u3068DFS\u306e\u63a2\u7d22\u306b\u7126\u70b9\u3092\u5f53\u3066\u307e\u3059\u3002<\/p>\n

\u6df1\u3055\u512a\u5148\u63a2\u7d22\uff08DFS\uff09\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h2>\n

\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u30eb\u30fc\u30c8\u30ce\u30fc\u30c9\u304b\u3089\u59cb\u307e\u308a\u3001\u305d\u308c\u305e\u308c\u306e\u679d\u3092\u63a2\u7d22\u3057\u305f\u5f8c\u306b\u30d0\u30c3\u30af\u30c8\u30e9\u30c3\u30af\u3057\u307e\u3059\u3002\u30b9\u30bf\u30c3\u30af\u3092\u4f7f\u7528\u3057\u3066\u5b9f\u88c5\u3055\u308c\u307e\u3059\u3002\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u969b\u306b\u306f\u3001\u518d\u5e30\u30b9\u30bf\u30c3\u30af\u3092\u4f7f\u7528\u3057\u3066\u30d0\u30c3\u30af\u30c8\u30e9\u30c3\u30af\u3057\u307e\u3059\u3002\u518d\u5e30\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u5de6\u53f3\u306e\u90e8\u5206\u6728\u3082\u6728\u3067\u3042\u308a\u3001\u540c\u3058\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u5171\u6709\u3067\u304d\u308b\u5229\u70b9\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u30d0\u30a4\u30ca\u30ea\u30c4\u30ea\u30fc\u306b\u306f\u3001DFS\u30c8\u30e9\u30d0\u30fc\u30b5\u30eb\u306b\u306f3\u7a2e\u985e\u3042\u308a\u307e\u3059\u3002<\/p>\n

    \n
  1. \n
      \u9806\u5e8f\u901a\u308a (\u3058\u3085\u3093\u3058\u3087\u3069\u304a\u308a)<\/ol>\n<\/li>\n<\/ol>\n

       <\/p>\n

        \n
      1. \n
          \u5148\u884c\u6ce8\u6587 (\u305b\u3093\u3053\u3046\u3061\u3085\u3046\u3082\u3093)<\/ol>\n<\/li>\n<\/ol>\n

           <\/p>\n

            \u5f8c\u884c\u6ce8\u6587 (\u3053\u3046\u3053\u3046\u3061\u3085\u3046\u3082\u3093)<\/ol>\n

            \u30ce\u30fc\u30c9\u3092\u6a2a\u65ad\u3059\u308b\u6700\u521d\u306e\u96a3\u63a5\u30ce\u30fc\u30c9\u3092\u8a2a\u554f\u3057\u3001\u96a3\u63a5\u30ce\u30fc\u30c9\u3092\u512a\u5148\u3057\u3066\u63a2\u7d22\u3059\u308b\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3001\u305d\u308c\u304c\u300c\u5e45\u512a\u5148\u63a2\u7d22\uff08BFS\uff09\u300d\u3067\u3059\u3002<\/h2>\n

            \u3053\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u3001\u30eb\u30fc\u30c8\u30ce\u30fc\u30c9\u304b\u3089\u59cb\u307e\u308a\u3001\u30ec\u30d9\u30eb\u3054\u3068\u306b\u3059\u3079\u3066\u306e\u30ce\u30fc\u30c9\u3092\u8a2a\u554f\u3057\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u30eb\u30fc\u30c8\u306e\u5f8c\u3001\u30eb\u30fc\u30c8\u306e\u76f4\u63a5\u306e\u5b50\u30ce\u30fc\u30c9\u3092\u9806\u306b\u79fb\u52d5\u3057\u307e\u3059\u3002\u30eb\u30fc\u30c8\u306e\u76f4\u63a5\u306e\u5b50\u30ce\u30fc\u30c9\u304c\u3059\u3079\u3066\u8a2a\u554f\u3055\u308c\u305f\u5f8c\u3001\u305d\u306e\u5b50\u30ce\u30fc\u30c9\u306b\u79fb\u52d5\u3057\u3001\u305d\u306e\u5f8c\u3082\u7d9a\u3051\u307e\u3059\u3002BFS\u3092\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u30ad\u30e5\u30fc\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n

            \u4e8c\u5206\u6728\u3067\u306f\u3001BFS\u306b\u5f93\u3046\u30ec\u30d9\u30eb\u9806\u63a2\u7d22\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

            Java\u3067\u306eBFS\u3068DFS\u306e\u5b9f\u88c5<\/h2>\n

            \u8003\u616e\u3057\u3066\u3044\u308b\u6728\u3092\u4ee5\u4e0b\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n

            \"Binary<\/div>\n

            TreeNode\u30af\u30e9\u30b9\u306e\u69cb\u9020\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n

             static<\/span> class<\/span> TreeNode<\/span> {<\/span>\r\n        int<\/span> data;<\/span>\r\n        TreeNode<\/span> left,<\/span> right;<\/span>\r\n\r\n        public<\/span> TreeNode<\/span>(<\/span>int<\/span> key)<\/span> {<\/span>\r\n            data =<\/span> key;<\/span>\r\n            left =<\/span> right =<\/span> null<\/span>;<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
            1. \u5148\u884c\u9806\u5e8f\u306e\u8d70\u67fb (Sengo-junjo no s\u014dsa)<\/h3>\n
            \u4e8c\u5206\u6728\u306e\u5148\u884c\u9806\u5de1\u56de\u3067\u306f\u3001\u307e\u305a\u6839\u3092\u5de1\u56de\u3057\u3001\u6b21\u306b\u5de6\u306e\u90e8\u5206\u6728\u3001\u6700\u5f8c\u306b\u53f3\u306e\u90e8\u5206\u6728\u3092\u5de1\u56de\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u518d\u5e30\u7684\u306b\u884c\u3046\u3053\u3068\u3067\u3001\u5de6\u53f3\u306e\u90e8\u5206\u6728\u3082\u6728\u3067\u3042\u308b\u3068\u3044\u3046\u7279\u6027\u3092\u6d3b\u304b\u3059\u305f\u3081\u3067\u3059\u3002<\/p>\n
            \u524d\u9806\u4f4d\u8d70\u67fb\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n
              \n
            1. \n
                \u6839\u3092\u6a2a\u65ad\u3057\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n
                 <\/p>\n
                  \n
                1. \n
                    \u5de6\u90e8\u5206\u6728\u306b\u5bfe\u3057\u3066preorder()\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n
                     <\/p>\n
                      \u53f3\u90e8\u5206\u6728\u306b\u5bfe\u3057\u3066preorder()\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002<\/ol>\n
                      \u4e0a\u8a18\u306e\u6728\u306ePre-Order\u30c8\u30e9\u30d0\u30fc\u30b5\u30eb\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n
                      0 1 3 4 2 \r\n<\/code><\/pre>\n
                      \u4ee5\u4e0b\u306fJava\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n
                       static<\/span> void<\/span> preorder<\/span>(<\/span>TreeNode<\/span> TreeNode<\/span>)<\/span> {<\/span>\r\n        if<\/span> (<\/span>TreeNode<\/span> ==<\/span> null<\/span>)<\/span>\r\n            return<\/span>;<\/span>\r\n\r\n        \/\/ Traverse root<\/span>\r\n        System<\/span>.<\/span>out.<\/span>print<\/span>(<\/span>TreeNode<\/span>.<\/span>item +<\/span> \"->\"<\/span>)<\/span>;<\/span>\r\n        \/\/ Traverse left<\/span>\r\n        preorder<\/span>(<\/span>TreeNode<\/span>.<\/span>left)<\/span>;<\/span>\r\n        \/\/ Traverse right<\/span>\r\n        preorder<\/span>(<\/span>TreeNode<\/span>.<\/span>right)<\/span>;<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
                      2. \u30a4\u30f3\u30aa\u30fc\u30c0\u30fc\u30c8\u30e9\u30d0\u30fc\u30b5\u30eb<\/h3>\n
                      \u4e8c\u5206\u6728\u306e\u4e2d\u9593\u9806\u8d70\u67fb\u306f\u3001\u6700\u521d\u306b\u5de6\u90e8\u5206\u6728\u3092\u8d70\u67fb\u3057\u3001\u6b21\u306b\u6839\u3001\u6700\u5f8c\u306b\u53f3\u90e8\u5206\u6728\u3092\u8d70\u67fb\u3057\u307e\u3059\u3002<\/p>\n
                      \u4e2d\u9593\u9806\u5e8f\u8d70\u67fb\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n
                        \n
                      1. \n
                          \u5de6\u306e\u30b5\u30d6\u30c4\u30ea\u30fc\u306b inorder() \u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n
                           <\/p>\n
                            \n
                          1. \n
                              \u6839\u3092\u30c8\u30e9\u30d0\u30fc\u30b9\u3057\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n
                               <\/p>\n
                                \u53f3\u306e\u30b5\u30d6\u30c4\u30ea\u30fc\u306b inorder() \u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002<\/ol>\n
                                \u4e0a\u8a18\u306e\u6728\u306e\u524d\u9806\u8d70\u67fb\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
                                3 1 4 0 2 \r\n<\/code><\/pre>\n
                                \u4ee5\u4e0b\u306fJava\u306e\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n
                                 static<\/span> void<\/span> inorder<\/span>(<\/span>TreeNode<\/span> TreeNode<\/span>)<\/span> {<\/span>\r\n        if<\/span> (<\/span>TreeNode<\/span> ==<\/span> null<\/span>)<\/span>\r\n            return<\/span>;<\/span>\r\n\r\n        \/\/ Traverse left<\/span>\r\n        inorder<\/span>(<\/span>TreeNode<\/span>.<\/span>left)<\/span>;<\/span>\r\n        \/\/ Traverse root<\/span>\r\n        System<\/span>.<\/span>out.<\/span>print<\/span>(<\/span>TreeNode<\/span>.<\/span>item +<\/span> \"->\"<\/span>)<\/span>;<\/span>\r\n        \/\/ Traverse right<\/span>\r\n        inorder<\/span>(<\/span>TreeNode<\/span>.<\/span>right)<\/span>;<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
                                3. \u5f8c\u884c\u9806\u5e8f\u306e\u63a2\u7d22<\/h3>\n
                                \u4e8c\u5206\u6728\u306e\u5f8c\u884c\u9806\u8d70\u67fb\u306f\u3001\u307e\u305a\u5de6\u306e\u90e8\u5206\u6728\u3092\u8d70\u67fb\u3057\u3001\u6b21\u306b\u53f3\u306e\u90e8\u5206\u6728\u3092\u8d70\u67fb\u3057\u3001\u6700\u5f8c\u306b\u6839\u3092\u8d70\u67fb\u3057\u307e\u3059\u3002<\/p>\n
                                \u5f8c\u884c\u9806\u5e8f\u8d70\u67fb\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059:<\/p>\n
                                  \n
                                1. \n
                                    – \u5de6\u306e\u90e8\u5206\u6728\u306bpostorder()\u3092\u547c\u3073\u51fa\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n
                                     <\/p>\n
                                      \n
                                    1. \n
                                        – \u53f3\u306e\u90e8\u5206\u6728\u306bpostorder()\u3092\u547c\u3073\u51fa\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n
                                         <\/p>\n
                                          – \u30eb\u30fc\u30c8\u3092\u8d70\u67fb\u3059\u308b\u3002<\/ol>\n
                                          \u4e0a\u8a18\u306e\u6728\u306e\u30dd\u30b9\u30c8\u30aa\u30fc\u30c0\u30fc\u30c8\u30e9\u30d0\u30fc\u30b5\u30eb\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
                                          3 4 1 2 0 \r\n<\/code><\/pre>\n
                                          \u4ee5\u4e0b\u306fJava\u306e\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n
                                           static<\/span> void<\/span> postorder<\/span>(<\/span>TreeNode<\/span> TreeNode<\/span>)<\/span> {<\/span>\r\n        if<\/span> (<\/span>TreeNode<\/span> ==<\/span> null<\/span>)<\/span>\r\n            return<\/span>;<\/span>\r\n\r\n        \/\/ Traverse left<\/span>\r\n        postorder<\/span>(<\/span>TreeNode<\/span>.<\/span>left)<\/span>;<\/span>\r\n        \/\/ Traverse right<\/span>\r\n        postorder<\/span>(<\/span>TreeNode<\/span>.<\/span>right)<\/span>;<\/span>\r\n        \/\/ Traverse root<\/span>\r\n        System<\/span>.<\/span>out.<\/span>print<\/span>(<\/span>TreeNode<\/span>.<\/span>item +<\/span> \"->\"<\/span>)<\/span>;<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
                                          4. \u30ec\u30d9\u30eb\u9806\u30c8\u30e9\u30d0\u30fc\u30b5\u30eb (Reberu jun torab\u0101saru)<\/h3>\n
                                          \u30ec\u30d9\u30eb\u9806\u30c8\u30e9\u30d0\u30fc\u30b5\u30eb\u306f\u3001\u8a2a\u308c\u308b\u30ce\u30fc\u30c9\u3092\u8ffd\u8de1\u3059\u308b\u305f\u3081\u306b\u30ad\u30e5\u30fc\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u30ce\u30fc\u30c9\u3092\u8a2a\u308c\u305f\u5f8c\u3001\u305d\u306e\u5b50\u30ce\u30fc\u30c9\u306f\u30ad\u30e5\u30fc\u306b\u5165\u308c\u307e\u3059\u3002\u65b0\u3057\u3044\u30ce\u30fc\u30c9\u3092\u30c8\u30e9\u30d0\u30fc\u30b9\u3059\u308b\u305f\u3081\u306b\u3001\u30ad\u30e5\u30fc\u304b\u3089\u8981\u7d20\u3092\u53d6\u308a\u51fa\u3057\u307e\u3059\u3002<\/p>\n
                                          \u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002 (Arugorizumu wa tsugi no t\u014dridesu.)<\/p>\n
                                            \n
                                          1. \n
                                              \u7a7a\u306e\u30ad\u30e5\u30fc\u3092\u521d\u671f\u5316\u3059\u308b<\/ol>\n<\/li>\n<\/ol>\n
                                               <\/p>\n
                                                \n
                                              1. \n
                                                  temp\u3092\u30eb\u30fc\u30c8\u3068\u3057\u3066\u8a2d\u5b9a\u3059\u308b<\/ol>\n<\/li>\n<\/ol>\n
                                                   <\/p>\n
                                                    \n
                                                  1. \n
                                                      \u30ad\u30e5\u30fc\u304c\u7a7a\u3067\u306a\u3044\u9593\u3001\u30eb\u30fc\u30d7\u3092\u5b9f\u884c\u3059\u308b<\/ol>\n<\/li>\n<\/ol>\n
                                                      temp\u306e\u30c7\u30fc\u30bf\u3092\u8868\u793a\u3059\u308b
                                                      \ntemp\u306e\u5b50\u3092\u5de6\u304b\u3089\u53f3\u306e\u9806\u756a\u3067\u30ad\u30e5\u30fc\u306b\u8ffd\u52a0\u3059\u308b
                                                      \n\u30ad\u30e5\u30fc\u304b\u3089\u30ce\u30fc\u30c9\u3092\u30c7\u30ad\u30e5\u30fc\u3057\u3001\u305d\u306e\u5024\u3092temp\u306b\u4ee3\u5165\u3059\u308b\u3002<\/p>\n
                                                      \u4e0a\u8a18\u306e\u6728\u306e\u30ec\u30d9\u30eb\u9806\u30c8\u30e9\u30d0\u30fc\u30b5\u30eb\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
                                                      0 1 2 3 4\r\n<\/code><\/pre>\n
                                                      \u4ee5\u4e0b\u306fJava\u306e\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n
                                                       static<\/span> void<\/span> printLevelOrder<\/span>(<\/span>TreeNode<\/span> root)<\/span> {<\/span>\r\n       Queue<\/span><<\/span>TreeNode<\/span>><\/span><\/span> queue =<\/span> new<\/span> LinkedList<\/span><<\/span>TreeNode<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>\r\n       queue.<\/span>add<\/span>(<\/span>root)<\/span>;<\/span>\r\n       while<\/span> (<\/span>!<\/span>queue.<\/span>isEmpty<\/span>(<\/span>)<\/span>)<\/span> {<\/span>\r\n           TreeNode<\/span> temp =<\/span> queue.<\/span>poll<\/span>(<\/span>)<\/span>;<\/span>\r\n           System<\/span>.<\/span>out.<\/span>print<\/span>(<\/span>temp.<\/span>data +<\/span> \" \"<\/span>)<\/span>;<\/span>\r\n\r\n           \/*add left child to the queue *\/<\/span>\r\n           if<\/span> (<\/span>temp.<\/span>left !=<\/span> null<\/span>)<\/span> {<\/span>\r\n               queue.<\/span>add<\/span>(<\/span>temp.<\/span>left)<\/span>;<\/span>\r\n           }<\/span>\r\n\r\n           \/*add right right child to the queue *\/<\/span>\r\n           if<\/span> (<\/span>temp.<\/span>right !=<\/span> null<\/span>)<\/span> {<\/span>\r\n               queue.<\/span>add<\/span>(<\/span>temp.<\/span>right)<\/span>;<\/span>\r\n           }<\/span>\r\n       }<\/span>\r\n   }<\/span>\r\n<\/code><\/pre>\n
                                                      BFS\u3068DFS\u306eJava\u306b\u304a\u3051\u308b\u30b3\u30fc\u30c9\u306e\u5b8c\u5168\u306a\u5b9f\u88c5<\/h2>\n
                                                      \u4ee5\u4e0b\u306b\u5b8c\u5168\u306aJava\u30b3\u30fc\u30c9\u304c\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
                                                      package<\/span> com.<\/span><\/span>JournalDev<\/span>;<\/span>\r\nimport<\/span> java.<\/span>util.<\/span><\/span>LinkedList<\/span><\/span>;<\/span>\r\nimport<\/span> java.<\/span>util.<\/span><\/span>Queue<\/span><\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Main<\/span> {<\/span>\r\n    static<\/span> class<\/span> TreeNode<\/span> {<\/span>\r\n        int<\/span> data;<\/span>\r\n        TreeNode<\/span> left,<\/span> right;<\/span>\r\n\r\n        public<\/span> TreeNode<\/span>(<\/span>int<\/span> key)<\/span> {<\/span>\r\n            data =<\/span> key;<\/span>\r\n            left =<\/span> right =<\/span> null<\/span>;<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    static<\/span> void<\/span> preorder<\/span>(<\/span>TreeNode<\/span> TreeNode<\/span>)<\/span> {<\/span>\r\n        if<\/span> (<\/span>TreeNode<\/span> ==<\/span> null<\/span>)<\/span>\r\n            return<\/span>;<\/span>\r\n\r\n        \/\/ Traverse root<\/span>\r\n        System<\/span>.<\/span>out.<\/span>print<\/span>(<\/span>TreeNode<\/span>.<\/span>data +<\/span> \" \"<\/span>)<\/span>;<\/span>\r\n        \/\/ Traverse left<\/span>\r\n        preorder<\/span>(<\/span>TreeNode<\/span>.<\/span>left)<\/span>;<\/span>\r\n        \/\/ Traverse right<\/span>\r\n        preorder<\/span>(<\/span>TreeNode<\/span>.<\/span>right)<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    static<\/span> void<\/span> inorder<\/span>(<\/span>TreeNode<\/span> TreeNode<\/span>)<\/span> {<\/span>\r\n        if<\/span> (<\/span>TreeNode<\/span> ==<\/span> null<\/span>)<\/span>\r\n            return<\/span>;<\/span>\r\n\r\n        \/\/ Traverse left<\/span>\r\n        inorder<\/span>(<\/span>TreeNode<\/span>.<\/span>left)<\/span>;<\/span>\r\n        \/\/ Traverse root<\/span>\r\n        System<\/span>.<\/span>out.<\/span>print<\/span>(<\/span>TreeNode<\/span>.<\/span>data +<\/span> \" \"<\/span>)<\/span>;<\/span>\r\n        \/\/ Traverse right<\/span>\r\n        inorder<\/span>(<\/span>TreeNode<\/span>.<\/span>right)<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    static<\/span> void<\/span> postorder<\/span>(<\/span>TreeNode<\/span> TreeNode<\/span>)<\/span> {<\/span>\r\n        if<\/span> (<\/span>TreeNode<\/span> ==<\/span> null<\/span>)<\/span>\r\n            return<\/span>;<\/span>\r\n\r\n        \/\/ Traverse left<\/span>\r\n        postorder<\/span>(<\/span>TreeNode<\/span>.<\/span>left)<\/span>;<\/span>\r\n        \/\/ Traverse right<\/span>\r\n        postorder<\/span>(<\/span>TreeNode<\/span>.<\/span>right)<\/span>;<\/span>\r\n        \/\/ Traverse root<\/span>\r\n        System<\/span>.<\/span>out.<\/span>print<\/span>(<\/span>TreeNode<\/span>.<\/span>data +<\/span> \" \"<\/span>)<\/span>;<\/span>\r\n    }<\/span>\r\n   static<\/span> void<\/span> printLevelOrder<\/span>(<\/span>TreeNode<\/span> root)<\/span> {<\/span>\r\n       Queue<\/span><<\/span>TreeNode<\/span>><\/span><\/span> queue =<\/span> new<\/span> LinkedList<\/span><<\/span>TreeNode<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>\r\n       queue.<\/span>add<\/span>(<\/span>root)<\/span>;<\/span>\r\n       while<\/span> (<\/span>!<\/span>queue.<\/span>isEmpty<\/span>(<\/span>)<\/span>)<\/span> {<\/span>\r\n           TreeNode<\/span> tempNode =<\/span> queue.<\/span>poll<\/span>(<\/span>)<\/span>;<\/span>\r\n           System<\/span>.<\/span>out.<\/span>print<\/span>(<\/span>tempNode.<\/span>data +<\/span> \" \"<\/span>)<\/span>;<\/span>\r\n\r\n           \/*add left child to the queue *\/<\/span>\r\n           if<\/span> (<\/span>tempNode.<\/span>left !=<\/span> null<\/span>)<\/span> {<\/span>\r\n               queue.<\/span>add<\/span>(<\/span>tempNode.<\/span>left)<\/span>;<\/span>\r\n           }<\/span>\r\n\r\n           \/*add right right child to the queue *\/<\/span>\r\n           if<\/span> (<\/span>tempNode.<\/span>right !=<\/span> null<\/span>)<\/span> {<\/span>\r\n               queue.<\/span>add<\/span>(<\/span>tempNode.<\/span>right)<\/span>;<\/span>\r\n           }<\/span>\r\n       }<\/span>\r\n   }<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span> args[<\/span>]<\/span>)<\/span>\r\n            \r\n    {<\/span>\r\n        TreeNode<\/span> root =<\/span> new<\/span> TreeNode<\/span>(<\/span>0<\/span>)<\/span>;<\/span>\r\n        root.<\/span>left =<\/span> new<\/span> TreeNode<\/span>(<\/span>1<\/span>)<\/span>;<\/span>\r\n        root.<\/span>right =<\/span> new<\/span> TreeNode<\/span>(<\/span>2<\/span>)<\/span>;<\/span>\r\n        root.<\/span>left.<\/span>left =<\/span> new<\/span> TreeNode<\/span>(<\/span>3<\/span>)<\/span>;<\/span>\r\n        root.<\/span>left.<\/span>right =<\/span> new<\/span> TreeNode<\/span>(<\/span>4<\/span>)<\/span>;<\/span>\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"Inorder traversal\"<\/span>)<\/span>;<\/span>\r\n        inorder<\/span>(<\/span>root)<\/span>;<\/span>\r\n\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"\\nPreorder traversal \"<\/span>)<\/span>;<\/span>\r\n        preorder<\/span>(<\/span>root)<\/span>;<\/span>\r\n\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"\\nPostorder traversal\"<\/span>)<\/span>;<\/span>\r\n       postorder<\/span>(<\/span>root)<\/span>;<\/span>\r\n\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"\\nLevelorder traversal\"<\/span>)<\/span>;<\/span>\r\n        printLevelOrder<\/span>(<\/span>root)<\/span>;<\/span>\r\n\r\n    }<\/span>\r\n\r\n}<\/span> \r\n\r\n<\/code><\/pre>\n
                                                      Output : \r\n\r\nInorder traversal\r\n3 1 4 0 2 \r\nPreorder traversal \r\n0 1 3 4 2 \r\nPostorder traversal\r\n3 4 1 2 0 \r\nLevelorder traversal\r\n0 1 2 3 4 \r\n\r\n<\/code><\/pre>\n
                                                      \"Tree<\/div>\n
                                                      \u7d50\u8ad6<\/h2>\n
                                                      \u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001\u4e8c\u5206\u6728\u306b\u304a\u3051\u308bBFS\u3068DFS\u306e\u8d70\u67fb\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3057\u305f\u3002C++\u3067DFS\u306e\u5b9f\u88c5\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u307e\u305f\u3001\u30ec\u30d9\u30eb\u9806\u8d70\u67fb\u306eC++\u5b9f\u88c5\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                                                      \u5e45\u512a\u5148\u63a2\u7d22\uff08Breadth-First Search\uff09\u3068\u6df1\u3055\u512a\u5148\u63a2\u7d22\uff08Depth-First Search\uff09\u306f\u3001\u30b0\u30e9\u30d5\u3084\u6728\u3092\u63a2\u7d22\u3059\u308b\u305f\u3081\u306e\u4e8c\u3064\u306e\u624b\u6cd5\u3067\u3059\u3002\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001\u4e3b\u306b\u6728\u306b\u304a\u3051\u308bBFS\u3068DFS\u306e\u63a2\u7d22\u306b\u7126\u70b9\u3092 […]<\/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-630","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\nJava\u3067\u4e8c\u5206\u6728\u306e\u5e45\u512a\u5148\u63a2\u7d22\uff08BFS\uff09\u3068\u6df1\u3055\u512a\u5148\u63a2\u7d22\uff08DFS\uff09 - Blog - 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