{"published":"2021-06-30 12:00:00","categories":["Java","\u6280\u8853"],"image_url":"https://cdn-ak.f.st-hatena.com/images/fotolife/n/nainaistar/20210620/20210620141146.png","description":"\u5c0f\u30cd\u30bf\u3002\u6b63\u76f4\u3001\u8a18\u8ff0\u91cf\u304c\u5897\u3048\u308b\u306e\u3067\u597d\u304d\u5acc\u3044\u3067\u8a00\u3046\u3068\u5acc\u3044\u3067\u3059\u304c\u3001NullPointerException(\u4ee5\u5f8c\u3001NPE)\u304c\u767a\u751f\u3057\u306a\u304f\u306a\u308b\u306e\u3067\u5b89\u5168\u306b\u51e6\u7406\u3057\u305f\u3044\u6642\u306f\u30aa\u30b9\u30b9\u30e1\u3067\u3059\u3002 \u74b0\u5883 Java 15 \u51fa\u73fe\u6642\u671f java.util.Objects Java1.7 Java7\u306e\u6642\u4ee3\u304b\u3089\u3042\u308a\u307e\u3059\u3002\u5206\u304b\u308a\u3065\u3089\u3044\u3067\u3059\u304c\u3001Object\u3067\u306f\u306a\u3044\u3067\u3059\u3002Objects\u3067\u3059\u3002 \u4f7f\u3044\u65b9 Objects.equals(Object a, Object b); \u3069\u306e\u8fba\u304c\u4fbf\u5229\u304b \u5b89\u5168\u306b\u6bd4\u8f03\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7279\u306b\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306e\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9(Integer, Boolean)\u7b49\u306fnull\u306b\u306a\u308a\u3046\u308a\u307e\u3059\u3002\u3082\u3057\u3001null\u3068\u6bd4\u8f03\u3057\u2026","url":"https://nainaistar.hatenablog.com/entry/2021/06/30/120000","width":"100%","height":"190","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fnainaistar.hatenablog.com%2Fentry%2F2021%2F06%2F30%2F120000\" title=\"Java\u3067\u6bd4\u8f03\u3059\u308b\u3068\u304d\u306fObjects.equals\u3092\u4f7f\u3046\u306e\u304c\u30aa\u30b9\u30b9\u30e1 - \u304d\u308a\u4e38\u306e\u6280\u8853\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_url":"https://nainaistar.hatenablog.com/","blog_title":"\u304d\u308a\u4e38\u306e\u6280\u8853\u65e5\u8a18","title":"Java\u3067\u6bd4\u8f03\u3059\u308b\u3068\u304d\u306fObjects.equals\u3092\u4f7f\u3046\u306e\u304c\u30aa\u30b9\u30b9\u30e1","type":"rich","author_name":"nainaistar","provider_url":"https://hatena.blog","version":"1.0","provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/nainaistar/"}