{"id":203899,"date":"2025-05-22T08:24:36","date_gmt":"2025-05-22T00:24:36","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203899\/"},"modified":"2025-05-22T08:24:36","modified_gmt":"2025-05-22T00:24:36","slug":"safevarargs%e6%b3%a8%e8%a7%a3%e4%b8%8b%e6%b3%9b%e5%9e%8b%e6%95%b0%e7%bb%84%e4%bb%8d%e7%84%b6%e6%8a%9b%e5%87%ba%e7%b1%bb%e5%9e%8b%e8%bd%ac%e6%8d%a2%e5%bc%82%e5%b8%b8%e6%80%8e%e4%b9%88%e5%8a%9e","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203899\/","title":{"rendered":"@SafeVarargs\u6ce8\u89e3\u4e0b\u6cdb\u578b\u6570\u7ec4\u4ecd\u7136\u629b\u51fa\u7c7b\u578b\u8f6c\u6362\u5f02\u5e38\u600e\u4e48\u529e\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

@SafeVarargs\u6ce8\u89e3\u4e0b\u6cdb\u578b\u6570\u7ec4\u4ecd\u7136\u629b\u51fa\u7c7b\u578b\u8f6c\u6362\u5f02\u5e38\u600e\u4e48\u529e\uff1f<\/h1>\n

\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86\u300a@SafeVarargs\u6ce8\u89e3\u4e0b\u6cdb\u578b\u6570\u7ec4\u4ecd\u7136\u629b\u51fa\u7c7b\u578b\u8f6c\u6362\u5f02\u5e38\u600e\u4e48\u529e\uff1f\u300b<\/span>\uff0c\u5176\u4e2d\u6d89\u53ca\u5230\u7684\u77e5\u8bc6\u70b9\u5305\u62ec<\/span>\u7b49\u7b49\uff0c\u65e0\u8bba\u4f60\u662f\u5c0f\u767d\u8fd8\u662f\u8001\u624b\uff0c\u90fd\u9002\u5408\u770b\u4e00\u770b\u54e6~\u6709\u597d\u7684\u5efa\u8bae\u4e5f\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u82e5\u662f\u770b\u5b8c\u6709\u6240\u6536\u83b7\uff0c\u4e5f\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u70b9\u8d5e\u652f\u6301\u5440\uff01\u4e00\u8d77\u52a0\u6cb9\u5b66\u4e60~<\/p>\n

<\/p>\n

\u6cdb\u578b\u6570\u7ec4 @safevarargs \u7684\u7528\u6cd5<\/strong><\/p>\n

\u9047\u5230\u4f7f\u7528 @safevarargs \u4ecd\u62a5 cast \u5f02\u5e38\u7684\u60c5\u51b5\u65f6\uff0c\u9700\u8981\u601d\u8003\u662f\u5426\u4f7f\u7528\u4e86\u6b63\u786e\u7684\u65b9\u5f0f\u3002<\/p>\n

@safevarargs \u7528\u4e8e\u4fee\u9970\u53c2\u6570\u4e3a\u53ef\u53d8\u53c2\u6570\u7684\u7684\u65b9\u6cd5\uff0c\u5141\u8bb8\u4f20\u9012\u4e0d\u540c\u7c7b\u578b\u4f46\u53ef\u8d4b\u503c\u7ed9\u58f0\u660e\u7c7b\u578b\u7684\u53c2\u6570\u3002\u4f8b\u5982\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n

@safevarargs\nstatic <t> t[] asarray(t... objs) {\n    return objs;\n}<\/pre>\n
\u6b64\u65f6\uff0c\u53ef\u4ee5\u50cf\u8fd9\u6837\u8c03\u7528\u8be5\u65b9\u6cd5\uff1a<\/p>\n
string[] arr = asarray(\"one\", \"two\", \"three\");\nsystem.out.println(arrays.tostring(arr));<\/pre>\n
\u7136\u800c\uff0c\u5728\u793a\u4f8b\u4ee3\u7801\u4e2d\uff0cpicktwo \u65b9\u6cd5\u8fd4\u56de\u7684 object[] \u6570\u7ec4\u4e0d\u80fd\u76f4\u63a5\u8d4b\u503c\u7ed9 string[] \u6570\u7ec4\uff0c\u56e0\u4e3a object[] \u6570\u7ec4\u4e0d\u662f string[] \u6570\u7ec4\u7684\u5b50\u96c6\u3002<\/p>\n
\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u793a\u4f8b\u4ee3\u7801\u4f7f\u7528\u4e86 aslist \u65b9\u6cd5\uff0c\u5b83\u5c06\u53ef\u53d8\u53c2\u6570\u8f6c\u6362\u4e3a\u4e00\u4e2a arraylist\uff0c\u7136\u540e\u4f7f\u7528 arraylist.aslist(objs) \u5c06\u5176\u8f6c\u6362\u4e3a\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4\u3002\u8fd9\u79cd\u65b9\u6cd5\u5141\u8bb8\u4f7f\u7528\u6cdb\u578b\u6570\u7ec4\uff0c\u540c\u65f6\u786e\u4fdd\u7c7b\u578b\u5b89\u5168\u3002<\/p>\n
\u4fee\u6539\u540e\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
import java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.List;\n\npublic class Main {\n    public static void main(String[] args) {\n        List<String> arr = asList(\"one\", \"two\", \"three\");\n        System.out.println(arr);\n        List<String> firstTwo = pickTwo(\"one\", \"two\", \"three\");\n        System.out.println(firstTwo);\n    }\n\n    static <K> List<K> pickTwo(K k1, K k2, K k3) {\n        return asList(k1, k2);\n    }\n\n    @SafeVarargs\n    static <T> List<T> asList(T... objs) {\n        return new ArrayList<>(Arrays.asList(objs));\n    }\n}<\/pre>\n
\u73b0\u5728\uff0c\u4ee3\u7801\u5c06\u6b63\u786e\u8fd0\u884c\uff0c\u800c\u4e0d\u4f1a\u51fa\u73b0\u4efb\u4f55 cast \u5f02\u5e38\u3002<\/p>\n
\u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300a@SafeVarargs\u6ce8\u89e3\u4e0b\u6cdb\u578b\u6570\u7ec4\u4ecd\u7136\u629b\u51fa\u7c7b\u578b\u8f6c\u6362\u5f02\u5e38\u600e\u4e48\u529e\uff1f\u300b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u5927\u5bb6\u90fd\u638c\u63e1\u4e86\u5427\uff01\u5982\u679c\u60f3\u8981\u7ee7\u7eed\u63d0\u5347\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u90a3\u4e48\u5c31\u6765\u5173\u6ce8\u516c\u4f17\u53f7\u5427\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
@SafeVarargs\u6ce8\u89e3\u4e0b\u6cdb...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-203899","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203899","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=203899"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203899\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203899"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203899"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203899"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}