{"id":93,"date":"2021-08-27T10:42:04","date_gmt":"2021-08-27T02:42:04","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/javav2\/?p=93"},"modified":"2021-08-27T10:42:04","modified_gmt":"2021-08-27T02:42:04","slug":"java-lang-nullpointerexception","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/javav2\/post-93.html","title":{"rendered":"java.lang.NullPointerException"},"content":{"rendered":"\n<p>\u5f53\u5e94\u7528\u7a0b\u5e8f\u8bd5\u56fe\u5728\u9700\u8981\u5bf9\u8c61\u7684\u5730\u65b9\u4f7f\u7528&nbsp;<code>null<\/code>&nbsp;\u65f6\uff0c\u629b\u51fa\u8be5\u5f02\u5e38\u3002\u8fd9\u79cd\u60c5\u51b5\u5305\u62ec\uff1a<\/p>\n\n\n\n<ul><li>\u8c03\u7528&nbsp;<code>null<\/code>&nbsp;\u5bf9\u8c61\u7684\u5b9e\u4f8b\u65b9\u6cd5\u3002<\/li><li>\u8bbf\u95ee\u6216\u4fee\u6539&nbsp;<code>null<\/code>&nbsp;\u5bf9\u8c61\u7684\u5b57\u6bb5\u3002<\/li><li>\u5c06&nbsp;<code>null<\/code>&nbsp;\u4f5c\u4e3a\u4e00\u4e2a\u6570\u7ec4\uff0c\u83b7\u5f97\u5176\u957f\u5ea6\u3002<\/li><li>\u5c06&nbsp;<code>null<\/code>&nbsp;\u4f5c\u4e3a\u4e00\u4e2a\u6570\u7ec4\uff0c\u8bbf\u95ee\u6216\u4fee\u6539\u5176\u65f6\u95f4\u7247\u3002<\/li><li>\u5c06&nbsp;<code>null<\/code>&nbsp;\u4f5c\u4e3a&nbsp;<code>Throwable<\/code>&nbsp;\u503c\u629b\u51fa\u3002<\/li><\/ul>\n\n\n\n<p>\u5e94\u7528\u7a0b\u5e8f\u5e94\u8be5\u629b\u51fa\u8be5\u7c7b\u7684\u5b9e\u4f8b\uff0c\u6307\u793a\u5176\u4ed6\u5bf9\u00a0<code>null<\/code>\u00a0\u5bf9\u8c61\u7684\u975e\u6cd5\u4f7f\u7528\u3002<\/p>\n\n\n\n<p>\u5b98\u65b9\u6587\u6863\u53c2\u8003\uff1a<a rel=\"noreferrer noopener\" href=\"https:\/\/java-api.52dixiaowo.com\/libs\/jdk-6-zh\/java\/lang\/NullPointerException.html\" target=\"_blank\">java.lang.NullPointerException<\/a><\/p>\n\n\n\n<p>\u9519\u8bef\u4e3e\u4f8b\uff1a\u4f7f\u7528null\u5bf9\u8c61\uff0c\u8c03\u7528\u5176\u65b9\u6cd5<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>    public static void main(String&#91;] args) throws ParseException {\n\n        String s = null;\n\n        System.out.println(s.equals(\"abc\"));  \/\/ java.lang.NullPointerException\n    }<\/code><\/pre>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f53\u5e94\u7528\u7a0b\u5e8f\u8bd5\u56fe\u5728\u9700\u8981\u5bf9\u8c61\u7684\u5730\u65b9\u4f7f\u7528&nbsp;null&nbsp;\u65f6\uff0c\u629b\u51fa\u8be5\u5f02\u5e38\u3002\u8fd9\u79cd\u60c5\u51b5\u5305\u62ec\uff1a \u8c03\u7528&#038;nbs&hellip; <a href=\"https:\/\/www.52dixiaowo.com\/javav2\/post-93.html\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">java.lang.NullPointerException<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[5],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/posts\/93"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/comments?post=93"}],"version-history":[{"count":0,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/posts\/93\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/media?parent=93"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/categories?post=93"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/tags?post=93"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}