{"id":6392,"date":"2014-10-16T00:41:33","date_gmt":"2014-10-15T15:41:33","guid":{"rendered":"http:\/\/rentan.org\/blog\/?p=6392"},"modified":"2015-03-22T09:56:37","modified_gmt":"2015-03-22T00:56:37","slug":"dmonkey-string-stringbuffer-object-comparison","status":"publish","type":"post","link":"https:\/\/rentan.org\/blog\/2014\/10\/16\/dmonkey-string-stringbuffer-object-comparison\/","title":{"rendered":"DMonkey: String\/StringBuffer \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u6bd4\u8f03"},"content":{"rendered":"<p><a href=\"http:\/\/peace.2ch.net\/test\/read.cgi\/win\/1412399700\/74\">http:\/\/peace.2ch.net\/test\/read.cgi\/win\/1412399700\/74<\/a> \u3088\u308a\u3002<\/p>\n<p>\u5225\u3005\u306e <code>String<\/code> \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092 <code>==<\/code> \u6f14\u7b97\u5b50\u3084 <code>===<\/code> \u6f14\u7b97\u5b50\u3067\u6bd4\u8f03\u3059\u308b\u3068\u3001<code>true<\/code> \u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<p>\u66f4\u306b\u3001<code>StringBuffer<\/code> \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3084\u3001<code>String<\/code>\u3001<code>StringBuffer<\/code> \u3092\u7d99\u627f\u3057\u305f\u30af\u30e9\u30b9\u540c\u58eb\u3067\u3082\u305d\u3046\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u4f8b\u3067\u306f\u3001\u5225\u3005\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306a\u306e\u3067\u6b63\u3057\u304f\u306f <code>false<\/code> \u3068\u306a\u308b\u3068\u3053\u308d\u3001\u5168\u3066 <code>true<\/code> \u3068\u8868\u793a\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"prog_code\">\r\n<code>class S extends String { }\r\nclass SB extends StringBuffer { }\r\n\r\nvar a = new String ('aaa');\r\nvar b = new String ('bbb');\r\nvar c = new S ('ccc');\r\nvar d = new S ('ddd');\r\n\r\nalert (a === b);  \/\/ String\u306e\u5225\u3005\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\r\nalert (c === d);  \/\/ String\u6d3e\u751f\u30af\u30e9\u30b9\u306e\u5225\u3005\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\r\nalert (a === c);  \/\/ String\u3068String\u6d3e\u751f\u30af\u30e9\u30b9\r\n\r\nvar e = new StringBuffer ('eeee');\r\nvar f = new StringBuffer ('fff');\r\nvar g = new SB ('ggg');\r\nvar h = new SB ('hhh');\r\n\r\nalert (e === f);  \/\/ StringBuffer\r\nalert (g === h);  \/\/ StringBuffer\u6d3e\u751f\u30af\u30e9\u30b9\r\nalert (e === g);  \/\/ StringBuffer\u3068StringBuffer\u6d3e\u751f\u30af\u30e9\u30b9\r\n\r\nalert (a === e);  \/\/ String\u3068StringBuffer\r\nalert (a === g);  \/\/ String\u3068StringBuffer\u6d3e\u751f\u30af\u30e9\u30b9\r\nalert (c === e);  \/\/ String\u6d3e\u751f\u30af\u30e9\u30b9\u3068StringBuffer\r\nalert (c === g);  \/\/ String\u6d3e\u751f\u30af\u30e9\u30b9\u3068StringBuffer\u6d3e\u751f\u30af\u30e9\u30b9<\/code>\r\n<\/pre>\n<p>2015-03-22 \u8ffd\u8a18<br \/>\n<code>new<\/code> \u3057\u3066\u306a\u3044 <code>String<\/code> \u305d\u306e\u3082\u306e\u3001<code>StringBuffer<\/code> \u305d\u306e\u3082\u306e\u3067\u3082 <code>true<\/code> \u306b\u306a\u308a\u307e\u3059\u3002<br \/>\n\u6d3e\u751f\u30af\u30e9\u30b9\u306e\u5834\u5408(\u4e0a\u306e\u4f8b\u306e S \u3084 SB)\u306f <code>false<\/code> \u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>http:\/\/peace.2ch.net\/test\/read.cgi\/win\/1412399700\/74 \u3088\u308a\u3002 \u5225\u3005\u306e String \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092 == \u6f14\u7b97\u5b50\u3084 === \u6f14\u7b97\u5b50\u3067\u6bd4\u8f03\u3059\u308b\u3068\u3001true \u306b\u306a\u3063\u3066\u3057\u307e\u3044 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[640],"tags":[1191],"class_list":["post-6392","post","type-post","status-publish","format-standard","hentry","category-irvine","tag-dmonkey"],"_links":{"self":[{"href":"https:\/\/rentan.org\/blog\/wp-json\/wp\/v2\/posts\/6392","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rentan.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rentan.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rentan.org\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rentan.org\/blog\/wp-json\/wp\/v2\/comments?post=6392"}],"version-history":[{"count":6,"href":"https:\/\/rentan.org\/blog\/wp-json\/wp\/v2\/posts\/6392\/revisions"}],"predecessor-version":[{"id":6610,"href":"https:\/\/rentan.org\/blog\/wp-json\/wp\/v2\/posts\/6392\/revisions\/6610"}],"wp:attachment":[{"href":"https:\/\/rentan.org\/blog\/wp-json\/wp\/v2\/media?parent=6392"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rentan.org\/blog\/wp-json\/wp\/v2\/categories?post=6392"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rentan.org\/blog\/wp-json\/wp\/v2\/tags?post=6392"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}