{"id":706,"date":"2008-02-10T00:00:00","date_gmt":"2008-02-09T15:00:00","guid":{"rendered":"http:\/\/localhost\/blog\/?p=692"},"modified":"2014-08-14T12:01:43","modified_gmt":"2014-08-14T03:01:43","slug":"%e3%83%ad%e3%83%93%e3%83%bc%e5%bc%b7%e5%88%b6%e5%88%87%e6%96%ad%e3%81%af%e5%8e%9f%e5%9b%a0%e4%b8%8d%e6%98%8e","status":"publish","type":"post","link":"https:\/\/denasu.com\/blog\/2008\/02\/diary706","title":{"rendered":"\u30ed\u30d3\u30fc\u5f37\u5236\u5207\u65ad\u306f\u539f\u56e0\u4e0d\u660e"},"content":{"rendered":"<p>\u30ed\u30d3\u30fc\u30021\u5e74\u304f\u3089\u3044\u524d\u304b\u3089\u51fa\u3066\u3044\u308b\uff0c\u30ed\u30d3\u30fc\u304b\u3089\u843d\u3068\u3055\u308c\u308b\u73fe\u8c61\u3092\u8abf\u67fb\u3057\u3066\u3044\u308b\u304c\uff0c\u672a\u3060\u539f\u56e0\u5206\u304b\u3089\u305a\u3002\u3068\u308a\u3042\u3048\u305a\u3053\u3053\u306b\u30b3\u30fc\u30c9\u3092\u8f09\u305b\u3066\u307f\u308b\u3002\u3044\u308d\u3044\u308d\u7701\u7565\u3057\u3066\u308b\u3051\u3069\uff0c\u30a4\u30e1\u30fc\u30b8\u7684\u306b\u306f\u3053\u3093\u306a\u611f\u3058\u3002\u30ed\u30d3\u30fc\u306e\u30e6\u30fc\u30b6\u540d\u3068\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u7ba1\u7406\u3059\u308b\u30af\u30e9\u30b9\u3002<\/p>\n<pre class=\"brush:java\">\r\npublic class LobbyTable\r\n{\r\n    Map _users = new HashMap();\r\n\r\n    public LobbyTable()\r\n    {\r\n        \/\/ \u30d5\u30a1\u30a4\u30eb\u304b\u3089\u30e6\u30fc\u30b6\u540d\u3068\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u8aad\u307f\u8fbc\u3093\u3067_users\u3092\u521d\u671f\u5316\u3002\r\n        \/\/ \u5b9f\u88c5\u306f\u7701\u7565\r\n        load();\r\n    }\r\n\r\n    public synchronized boolean login(String name, String password)\r\n    {\r\n        if(_users.get(name) == null)\r\n        {\r\n            _users.put(name, password);\r\n\r\n            \/\/ \u30d5\u30a1\u30a4\u30eb\u306b\u30e6\u30fc\u30b6\u540d\u3068\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u66f8\u304d\u8fbc\u3080\r\n            \/\/ \u5b9f\u88c5\u306f\u7701\u7565\r\n            save();\r\n        }\r\n        else\r\n        {\r\n            if(password.equals((String)_users.get(name)))\r\n            {\r\n                return true;\r\n            }\r\n            else\r\n            {\r\n                return false;\r\n            }\r\n        }\r\n    }\r\n\r\n    public synchronized void changePassword(String name, String password)\r\n    {\r\n        _users.put(name, password);\r\n\r\n        \/\/ \u30d5\u30a1\u30a4\u30eb\u306b\u30e6\u30fc\u30b6\u540d\u3068\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u66f8\u304d\u8fbc\u3080\r\n        \/\/ \u5b9f\u88c5\u306f\u7701\u7565\r\n        save();\r\n    }\r\n}\r\n<\/pre>\n<p>\u3067\uff0c\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u304c\u4ee5\u4e0b\u3002<\/p>\n<pre class=\"brush:java\">\r\njava.lang.NullPointerException\r\n   at Lobby.LobbyTable.changePassword (LobbyTable.java:91)\r\n   \u2026\r\n<\/pre>\n<p>HashMap.put\u306e\u5f15\u6570\u306f2\u3064\u3068\u3082NULL\u53ef\u306a\u306e\u3067name\u3068password\u306f\u95a2\u4fc2\u306a\u3044\u3002\u5b9f\u969b\u30c7\u30d0\u30c3\u30b0\u30b3\u30fc\u30c9\u3092\u5165\u308c\u3066\u3082NULL\u306b\u306f\u306a\u3063\u3066\u3044\u306a\u3044\u3002java.util.HashMap\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u898b\u3066\u3082\u7279\u306bNullPointerException\u304c\u767a\u751f\u3057\u305d\u3046\u306a\u3068\u3053\u308d\u306f\u306a\u3044\u3002\u6b8b\u308b\u306e\u306f_users\u304cNULL\u306e\u53ef\u80fd\u6027\u3060\u3051\u3060\u304c\u2026\u3002\u540c\u671f\u51e6\u7406\u3067\u5931\u6557\u3057\u3066\uff0c\u3063\u3066\u3044\u3046\u306e\u304c\u8003\u3048\u3089\u308c\u305d\u3046\u3060\u304c\uff0c\u305d\u308c\u3060\u3068synchronizedMap\u3092\u4f7f\u3048\u3070\u89e3\u6c7a\u3059\u308b\u306e\u304b\u3082\u3057\u308c\u306a\u3044\u3002\u3067\u3082\u539f\u56e0\u304c\u5206\u304b\u3089\u306a\u3044\u307e\u307e\u5909\u3048\u308b\u306e\u3082\u6c17\u6301\u3061\u60aa\u3044\u3002<\/p>\n<p>\u767a\u751f\u78ba\u7387\u306f\u304b\u306a\u308a\u4f4e\u3081\u3002\u30ed\u30d3\u30fc\u304c\u6df7\u3093\u3067\u308b\u3068\u304d\u306b\u8d77\u3053\u308a\u3084\u3059\u3044\u304b\u3082\u77e5\u308c\u306a\u3044\u3002Java\u306e\u3059\u3054\u3044\u4eba\u304b\u3089\u306e\u30c4\u30c3\u30b3\u30df\u3092\u671f\u5f85\u3057\u3066\u2026\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30ed\u30d3\u30fc\u30021\u5e74\u304f\u3089\u3044\u524d\u304b\u3089\u51fa\u3066\u3044\u308b\uff0c\u30ed\u30d3\u30fc\u304b\u3089\u843d\u3068\u3055\u308c\u308b\u73fe\u8c61\u3092\u8abf\u67fb\u3057\u3066\u3044\u308b\u304c\uff0c\u672a\u3060\u539f\u56e0\u5206\u304b\u3089\u305a\u3002\u3068\u308a\u3042\u3048\u305a\u3053\u3053\u306b\u30b3\u30fc\u30c9\u3092\u8f09\u305b\u3066\u307f\u308b\u3002\u3044\u308d\u3044\u308d\u7701\u7565\u3057\u3066\u308b\u3051\u3069\uff0c\u30a4\u30e1\u30fc\u30b8\u7684\u306b\u306f\u3053\u3093\u306a\u611f\u3058\u3002\u30ed\u30d3\u30fc\u306e\u30e6\u30fc\u30b6\u540d\u3068\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u7ba1\u7406\u3059\u308b\u30af\u30e9\u30b9\u3002 public class LobbyTable { Map _users = new HashMap(); public LobbyTable() { \/\/ \u30d5\u30a1\u30a4\u30eb\u304b\u3089\u30e6\u30fc\u30b6\u540d\u3068\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u8aad\u307f\u8fbc\u3093\u3067_users\u3092\u521d\u671f\u5316\u3002 \/\/ \u5b9f\u88c5\u306f\u7701\u7565 load(); } public synchronized boolean login(String name, String password) { if(_users.get(name) == null) { _users.put(name, password); \/\/ \u30d5\u30a1\u30a4\u30eb\u306b\u30e6\u30fc\u30b6\u540d\u3068\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u66f8\u304d\u8fbc\u3080 \/\/ \u5b9f\u88c5\u306f\u7701\u7565 save(); } else { if(password.equals((String)_users.get(name))) { return true; } else { return false; } } } public synchronized [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2],"tags":[8],"class_list":["post-706","post","type-post","status-publish","format-standard","hentry","category-programming","tag-weathertyping"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p4ZThs-bo","_links":{"self":[{"href":"https:\/\/denasu.com\/blog\/wp-json\/wp\/v2\/posts\/706","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/denasu.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/denasu.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/denasu.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/denasu.com\/blog\/wp-json\/wp\/v2\/comments?post=706"}],"version-history":[{"count":2,"href":"https:\/\/denasu.com\/blog\/wp-json\/wp\/v2\/posts\/706\/revisions"}],"predecessor-version":[{"id":2472,"href":"https:\/\/denasu.com\/blog\/wp-json\/wp\/v2\/posts\/706\/revisions\/2472"}],"wp:attachment":[{"href":"https:\/\/denasu.com\/blog\/wp-json\/wp\/v2\/media?parent=706"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/denasu.com\/blog\/wp-json\/wp\/v2\/categories?post=706"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/denasu.com\/blog\/wp-json\/wp\/v2\/tags?post=706"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}