{"id":5026,"date":"2025-04-01T13:34:55","date_gmt":"2025-04-01T05:34:55","guid":{"rendered":"https:\/\/qaqaq.top\/?p=5026"},"modified":"2025-04-01T13:34:55","modified_gmt":"2025-04-01T05:34:55","slug":"equals-%e7%a9%ba%e6%8c%87%e9%92%88%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=5026","title":{"rendered":"equals \u7a7a\u6307\u9488\u95ee\u9898"},"content":{"rendered":"\n<p>\u5728Java\u4e2d\uff0c<code>\"2\".equals(isFlag)<\/code>\u8fd9\u4e2a\u8868\u8fbe\u5f0f\u672c\u8eab\u4e0d\u4f1a\u5bfc\u81f4\u7a7a\u6307\u9488\u5f02\u5e38\uff08NullPointerException\uff09\u3002\u4f46\u662f\uff0c\u5982\u679c<code>isFlag<\/code>\u662f<code>null<\/code>\uff0c\u90a3\u4e48\u8c03\u7528<code>isFlag.equals(\"2\")<\/code>\u4f1a\u629b\u51fa\u7a7a\u6307\u9488\u5f02\u5e38\u3002<\/p>\n\n\n\n<p><code>\"2\".equals(isFlag)<\/code>\u8fd9\u4e2a\u8868\u8fbe\u5f0f\u662f\u5728\u68c0\u67e5\u5b57\u7b26\u4e32\u5b57\u9762\u91cf<code>\"2\"<\/code>\u662f\u5426\u4e0e<code>isFlag<\/code>\u76f8\u7b49\uff0c\u7531\u4e8e\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u4e0d\u662f<code>null<\/code>\uff0c\u6240\u4ee5\u8fd9\u4e2a\u8c03\u7528\u662f\u5b89\u5168\u7684\u3002\u5982\u679c<code>isFlag<\/code>\u662f<code>null<\/code>\uff0c\u8868\u8fbe\u5f0f\u4f1a\u8fd4\u56de<code>false<\/code>\uff0c\u800c\u4e0d\u4f1a\u629b\u51fa\u5f02\u5e38\u3002<\/p>\n\n\n\n<p>\u76f8\u5bf9\u7684\uff0c\u5982\u679c\u5199\u6210<code>isFlag.equals(\"2\")<\/code>\uff0c\u5f53<code>isFlag<\/code>\u4e3a<code>null<\/code>\u65f6\uff0c\u5c1d\u8bd5\u8c03\u7528<code>null<\/code>\u7684<code>equals<\/code>\u65b9\u6cd5\u4f1a\u5f15\u53d1\u7a7a\u6307\u9488\u5f02\u5e38\u3002<\/p>\n\n\n\n<p>\u56e0\u6b64\uff0c\u4e3a\u4e86\u9632\u6b62\u7a7a\u6307\u9488\u5f02\u5e38\uff0c\u63a8\u8350\u5728\u4f7f\u7528<code>equals<\/code>\u65b9\u6cd5\u65f6\uff0c\u5c06\u5df2\u77e5\u7684\u975e<code>null<\/code>\u5bf9\u8c61\u653e\u5728\u524d\u9762\uff0c\u5982<code>\"2\".equals(isFlag)<\/code>\u3002\u8fd9\u6837\u7684\u5199\u6cd5\u66f4\u4e3a\u5b89\u5168<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728Java\u4e2d\uff0c&#8221;2&#8243;.equals(isFlag)\u8fd9\u4e2a\u8868\u8fbe\u5f0f\u672c\u8eab\u4e0d\u4f1a\u5bfc\u81f4\u7a7a\u6307\u9488\u5f02\u5e38\uff08NullPointerEx [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29],"tags":[46],"class_list":["post-5026","post","type-post","status-publish","format-standard","hentry","category-java-","tag-java"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/5026"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5026"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/5026\/revisions"}],"predecessor-version":[{"id":5027,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/5026\/revisions\/5027"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5026"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5026"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5026"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}