\r\npackage jp.yucchi.nan;\r\n\r\npublic class NaN {\r\n\r\n public static void main(String[] args) {\r\n\r\n double a = 0.0 \/ 0.0;\r\n System.out.println(a + \" : \" + (a == a));\r\n\r\n Double b = new Double(0.0 \/ 0.0);\r\n System.out.println(b + \" : \" + b.equals(b));\r\n \r\n Double c = new Double(+0.0);\r\n Double d = new Double(-0.0);\r\n System.out.println(\"c = \" + c);\r\n System.out.println(\"d = \" + d);\r\n System.out.println(c == d);\r\n System.out.println(c.equals(d));\r\n System.out.println(c.doubleValue() == d.doubleValue()); \r\n \r\n }\r\n\r\n}\r\n\r\n\r\n<\/pre>\n

\u3061\u306a\u307f\u306b\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

NaN : false
NaN : true
c = 0.0
d = -0.0
false
false
true<\/p>\n

\u304a\u7d42\u3044\uff01<\/p>\n

Hatena \u30bf\u30b0: Java<\/a><\/div>\n

$\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0$ <\/a><\/div>\n

$Facebook \u306b\u30b7\u30a7\u30a2$ <\/a><\/div>\n

<\/g:plusone><\/div>\n

Tweet<\/a><\/div>\n <\/div>\n
\n","protected":false},"excerpt":{"rendered":"

\u30e1\u30a4\u30f3\u3067\u4f7f\u3063\u3066\u3044\u308b PC \u306f OS \u3092\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3092 Windows7 \u306e\u3053\u308d\u304b\u3089\u7e70\u308a\u8fd4\u3057\u3066\u3044\u305f\u305b\u3044\u304b\u52d5\u4f5c\u304c\u602a\u3057\u304f\u306a\u3063\u3066\u304d\u305f\u3002 \u9762\u5012\u304f\u3055\u3044\u3051\u3069\u30af\u30ea\u30fc\u30f3\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3092\u3057\u3066 Windows 10 Anniversary Update \u306b\u3057\u305f\u3002 Windows 10 Anniversary Update \u304c\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u3066\u304b\u3089\u306b\u3057\u3088\u3046\u3068\u601d\u3063\u305f\u304c\u304a\u76c6\u4f11\u307f\u307e\u3067\u306b\u4ee5\u524d\u306e\u74b0\u5883\u3092\u5fa9\u6d3b\u3055\u305b\u305f\u304b\u3063\u305f\u306e\u3067\u30bf\u30a4\u30df\u30f3\u30b0\u306e\u826f\u304f\u306a\u3044\u518d\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3092\u304a\u3053\u306a\u3063\u305f\u3002 \u3053\u308c\u3067\u5feb\u9069\u306a\u72b6\u614b\u306b\u623b\u308c\u308b\u3068\u601d\u3063\u305f\u304c Windows Live Writer \u304c\u304a\u304b\u3057\u304f\u306a\u3063\u305f\u3002 \u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u7248\u306e Open Live Writer \u3082\u8a66\u3057\u3066\u307f\u305f\u3051\u2026<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[17],"class_list":["post-2230","post","type-post","status-publish","format-standard","hentry","category-java","tag-java"],"_links":{"self":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/2230","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2230"}],"version-history":[{"count":4,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/2230\/revisions"}],"predecessor-version":[{"id":2235,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/2230\/revisions\/2235"}],"wp:attachment":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2230"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2230"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2230"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}