{"id":10006265,"date":"2022-08-21T18:19:53","date_gmt":"2022-08-21T10:19:53","guid":{"rendered":"https:\/\/ityet.com\/?p=10006265"},"modified":"2022-08-21T18:19:53","modified_gmt":"2022-08-21T10:19:53","slug":"%e4%bc%99%e8%ae%a1%ef%bc%8cgo%e9%a1%b9%e7%9b%ae%e6%80%8e%e4%b9%88%e4%bd%bf%e7%94%a8%e6%9e%9a%e4%b8%be%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006265","title":{"rendered":"\u4f19\u8ba1\uff0cGo\u9879\u76ee\u600e\u4e48\u4f7f\u7528\u679a\u4e3e\uff1f"},"content":{"rendered":"

\u524d\u8a00<\/h2>\n

\u54c8\u55bd\uff0c\u5927\u5bb6\u597d\uff0c\u6211\u662fasong<\/code>\u3002\u679a\u4e3e\u662f\u4e00\u79cd\u5f88\u91cd\u8981\u7684\u6570\u636e\u7c7b\u578b\uff0c\u5728java<\/code>\u3001C<\/code>\u8bed\u8a00\u7b49\u4e3b\u6d41\u7f16\u7a0b\u8bed\u8a00\u4e2d\u90fd\u652f\u6301\u4e86\u679a\u4e3e\u7c7b\u578b\uff0c\u4f46\u662f\u5728Go\u8bed\u8a00\u4e2d\u5374\u6ca1\u6709\u679a\u4e3e\u7c7b\u578b\uff0c\u90a3\u6709\u4ec0\u4e48\u66ff\u4ee3\u65b9\u6848\u5417\uff1f \u672c\u6587\u6211\u4eec\u6765\u804a\u4e00\u804a\u8fd9\u4e2a\u4e8b\u60c5\uff1b<\/p><\/blockquote>\n

\u4e3a\u4ec0\u4e48\u8981\u6709\u679a\u4e3e<\/h2>\n

\u6211\u4eec\u4ee5java<\/code>\u8bed\u8a00\u4e3a\u4f8b\u5b50\uff0c\u5728JDK1.5<\/code>\u4e4b\u524d\u6ca1\u6709\u679a\u4e3e\u7c7b\u578b\uff0c\u6211\u4eec\u901a\u5e38\u4f1a\u4f7f\u7528int<\/code>\u5e38\u91cf\u6765\u8868\u793a\u679a\u4e3e\uff0c\u4e00\u822c\u4f7f\u7528\u5982\u4e0b\uff1a<\/p>\n

public static final int COLOR_RED = 1;\npublic static final int COLOR_BLUE = 2;\npublic static final int COLOR_GREEN = 3;<\/code><\/pre>\n
\u4f7f\u7528int<\/code>\u7c7b\u578b\u4f1a\u5b58\u5728\u4ee5\u4e0b\u9690\u60a3\uff1a<\/p>\n
    \n
  • \u4e0d\u5177\u5907\u5b89\u5168\u6027\uff0c\u58f0\u660e\u65f6\u5982\u679c\u6ca1\u6709\u4f7f\u7528final<\/code>\u5c31\u4f1a\u9020\u6210\u503c\u88ab\u7be1\u6539\u7684\u98ce\u9669\uff1b<\/li>\n
  • \u8bed\u4e49\u4e0d\u591f\u660e\u786e\uff0c\u6253\u5370int<\/code>\u578b\u6570\u5b57\u5e76\u4e0d\u77e5\u9053\u5176\u5177\u4f53\u542b\u4e49<\/li>\n<\/ul>\n
    \u4e8e\u662f\u4e4e\u6211\u4eec\u5c31\u60f3\u5230\u7528\u5e38\u91cf\u5b57\u7b26\u6765\u8868\u793a\uff0c\u4ee3\u7801\u5c31\u53d8\u6210\u4e86\u8fd9\u6837\uff1a<\/p>\n
    public static final String COLOR_RED = "RED";\npublic static final String COLOR_BLUE = "BLUE";\npublic static final String COLOR_GREEN = "GREEN";<\/code><\/pre>\n
    \u8fd9\u6837\u4e5f\u540c\u6837\u5b58\u5728\u95ee\u9898\uff0c\u56e0\u4e3a\u6211\u4eec\u4f7f\u7528\u7684\u5e38\u91cf\u5b57\u7b26\uff0c\u90a3\u4e48\u6709\u4e9b\u7a0b\u5e8f\u733f\u4e0d\u6309\u5957\u8def\u51fa\u724c\u5c31\u53ef\u4ee5\u4f7f\u7528\u5b57\u7b26\u4e32\u7684\u503c\u8fdb\u884c\u6bd4\u8f83\uff0c\u8fd9\u6837\u7684\u4ee3\u7801\u4f1a\u88ab\u4e0d\u65ad\u6a21\u4eff\u53d8\u5f97\u8d8a\u6765\u8d8a\u591a\u7684\uff0c\u7136\u540e\u5c4e\u5c71\u5c31\u51fa\u73b0\u4e86\uff1b<\/p>\n
    \u6240\u4ee5\u6211\u4eec\u8feb\u5207\u9700\u8981\u679a\u4e3e\u7c7b\u578b\u7684\u51fa\u73b0\u6765\u8d77\u5230\u7ea6\u675f\u7684\u4f5c\u7528\uff0c\u5047\u8bbe\u4f7f\u7528\u4e00\u4e2a\u679a\u4e3e\u7c7b\u578b\u505a\u5165\u53c2\uff0c\u679a\u4e3e\u7c7b\u578b\u5c31\u53ef\u4ee5\u9650\u5b9a\u6c99\u96d5\u7528\u6237\u4e0d\u6309\u5957\u8def\u4f20\u53c2\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u603c\u4ed6\u4e86\uff0c\u54c8\u54c8\uff5e\uff1b<\/p>\n
    \u4f7f\u7528\u679a\u4e3e\u7684\u4ee3\u7801\u5c31\u53ef\u4ee5\u53d8\u6210\u8fd9\u6837\uff0c\u4f20\u4e86\u679a\u4e3e\u4e4b\u5916\u7684\u7c7b\u578b\u90fd\u4e0d\u53ef\u4ee5\u4e86\uff1b<\/p>\n
    public class EnumClass {\n    public static void main(String [] args){\n        Color color = Color.RED;\n        convert(color);\n        System.out.println(color.name());\n\n    }\n\n    public static void convert(Color c){\n        System.out.println(c.name());\n    }\n\n}\n\nenum Color{\n    RED,BLUE,GREEN;\n}<\/code><\/pre>\n
    Go\u8bed\u8a00\u5c31\u6ca1\u6709\u679a\u4e3e\u7c7b\u578b\uff0c\u6211\u4eec\u8be5\u4f7f\u7528\u4ec0\u4e48\u65b9\u6cd5\u6765\u66ff\u4ee3\u5462\uff1f<\/p>\n
    \u5b9a\u4e49\u65b0\u7c7b\u578b\u5b9e\u73b0\u679a\u4e3e<\/h2>\n
    \u679a\u4e3e\u901a\u5e38\u662f\u4e00\u7ec4\u76f8\u5173\u7684\u5e38\u91cf\u96c6\u5408\uff0cGo<\/code>\u8bed\u8a00\u4e2d\u6709\u63d0\u4f9b\u5e38\u91cf\u7c7b\u578b\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5e38\u91cf\u6765\u58f0\u660e\u679a\u4e3e\uff0c\u4f46\u4e5f\u540c\u6837\u4f1a\u9047\u5230\u4e0a\u8ff0\u7684\u95ee\u9898\uff0c\u8d77\u4e0d\u5230\u7ea6\u675f\u7684\u4f5c\u7528\uff0c\u6240\u4ee5\u4e3a\u4e86\u8d77\u5230\u7ea6\u675f\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Go<\/code>\u8bed\u8a00\u53e6\u5916\u4e00\u4e2a\u77e5\u8bc6\u70b9 — \u7c7b\u578b\u5b9a\u4e49\uff0cGo<\/code>\u8bed\u8a00\u4e2d\u53ef\u4ee5\u4f7f\u7528type<\/code>\u5173\u952e\u5b57\u5b9a\u4e49\u4e0d\u540c\u7684\u7c7b\u578b\uff0c\u6211\u4eec\u53ef\u4ee5\u4e3a\u6574\u578b\u3001\u6d6e\u70b9\u578b\u3001\u5b57\u7b26\u578b\u7b49\u5b9a\u4e49\u65b0\u7684\u7c7b\u578b\uff0c\u65b0\u7684\u7c7b\u578b\u4e0e\u539f\u7c7b\u578b\u8f6c\u6362\u9700\u8981\u663e\u5f0f\u8f6c\u6362\uff0c\u8fd9\u6837\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u4e5f\u8d77\u5230\u4e86\u7ea6\u675f\u7684\u4f5c\u7528\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u7528Go<\/code>\u8bed\u8a00\u5b9e\u73b0\u5982\u4e0b\u679a\u4e3e\uff1a<\/p>\n
    type OrderStatus int\n\nconst (\n    CREATE OrderStatus = iota + 1\n    PAID\n    DELIVERING\n    COMPLETED\n    CANCELLED\n)\n\nfunc main() {\n    a := 100\n    IsCreated(a)\n}<\/code><\/pre>\n
    \u4e0a\u9762\u7684\u4ee3\u7801\u5c31\u4f1a\u62a5\u9519\uff1a<\/p>\n
    .\/main.go:19:12: cannot use a (variable of type int) as type OrderStatus in argument to IsCreated<\/code><\/pre>\n
    \u5b9a\u4e49\u65b0\u7684\u7c7b\u578b\u53ef\u4ee5\u8d77\u5230\u7ea6\u675f\u4f5c\u7528\uff0c\u6bd4\u5982\u6211\u4eec\u8981\u68c0\u67e5\u72b6\u6001\u673a\uff0c\u5165\u53c2\u9650\u5b9a\u4e86\u5fc5\u987b\u662fOrderStatus\u7c7b\u578b\uff0c\u5982\u679c\u662fint<\/code>\u7c7b\u578b\u5c31\u4f1a\u62a5\u9519\u3002<\/p>\n
    \u4e0a\u9762\u6211\u4eec\u7684\u679a\u4e3e\u5b9e\u73b0\u65b9\u5f0f\u53ea\u80fd\u83b7\u53d6\u679a\u4e3e\u503c\uff0c\u83b7\u53d6\u4e0d\u5230\u5176\u6620\u5c04\u7684\u5b57\u9762\u610f\u601d\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u4f18\u5316\u4e00\u4e0b\uff0c\u5b9e\u73b0String<\/code>\u65b9\u6cd5\uff0c\u4f7f\u7528\u5b98\u65b9\u63d0\u4f9b\u7684cmd\/string\u6765\u5feb\u901f\u5b9e\u73b0\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
    \/\/go:generate stringer -type=OrderStatus\ntype OrderStatus int\n\nconst (\n    CREATE OrderStatus = iota + 1\n    PAID\n    DELIVERING\n    COMPLETED\n    CANCELLED\n)<\/code><\/pre>\n
    \u6267\u884c\u547d\u4ee4go generate .\/...<\/code>\u751f\u6210orderstatus_string.go\u6587\u4ef6\uff1a<\/p>\n
    import "strconv"\n\nfunc _() {\n    \/\/ An "invalid array index" compiler error signifies that the constant values have changed.\n    \/\/ Re-run the stringer command to generate them again.\n    var x [1]struct{}\n    _ = x[CREATE-1]\n    _ = x[PAID-2]\n    _ = x[DELIVERING-3]\n    _ = x[COMPLETED-4]\n    _ = x[CANCELLED-5]\n}\n\nconst _OrderStatus_name = "CREATEPAIDDELIVERINGCOMPLETEDCANCELLED"\n\nvar _OrderStatus_index = [...]uint8{0, 6, 10, 20, 29, 38}\n\nfunc (i OrderStatus) String() string {\n    i -= 1\n    if i < 0 || i >= OrderStatus(len(_OrderStatus_index)-1) {\n        return "OrderStatus(" + strconv.FormatInt(int64(i+1), 10) + ")"\n    }\n    return _OrderStatus_name[_OrderStatus_index[i]:_OrderStatus_index[i+1]]\n}<\/code><\/pre>\n
    protobuf\u4e2d\u751f\u6210\u7684\u679a\u4e3e\u4ee3\u7801<\/h2>\n
    Go<\/code>\u8bed\u8a00\u4f7f\u7528protobuf\u4f1a\u751f\u6210\u5bf9\u5e94\u7684\u679a\u4e3e\u4ee3\u7801\uff0c\u6211\u4eec\u53d1\u73b0\u5176\u4e2d\u4e5f\u662f\u4f7f\u7528\u5b9a\u4e49\u65b0\u7684\u7c7b\u578b\u7684\u65b9\u5f0f\u6765\u5b9e\u73b0\u7684\uff0c\u7136\u540e\u5728\u5c01\u88c5\u4e00\u4e9b\u65b9\u6cd5\uff0c\u6211\u4eec\u6765\u8d4f\u6790\u4e00\u4e0bprotobuf\u751f\u6210\u7684\u679a\u4e3e\u4ee3\u7801\uff1a<\/p>\n
    const (\n    CREATED  OrderStatus = 1\n    PAID OrderStatus = 2\n    CANCELED OrderStatus = 3\n)\n\nvar OrderStatus_name = map[int32]string{\n    1: "CREATED",\n    2: "PAID",\n    3: "CANCELED",\n}\n\nvar OrderStatus_value = map[string]int32{\n    "CREATED":  1,\n    "PAID": 2,\n    "CANCELED": 3,\n}\n\nfunc (x OrderStatus) Enum() *OrderStatus {\n    p := new(OrderStatus)\n    *p = x\n    return p\n}\n\nfunc (x OrderStatus) String() string {\n    return proto.EnumName(OrderStatus_name, int32(x))\n}\n\nfunc (x *OrderStatus) UnmarshalJSON(data []byte) error {\n    value, err := proto.UnmarshalJSONEnum(OrderStatus_value, data, "OrderStatus")\n    if err != nil {\n        return err\n    }\n    *x = OrderStatus(value)\n    return nil\n}<\/code><\/pre>\n
    \u603b\u7ed3<\/h2>\n
    \u867d\u7136Go\u8bed\u8a00\u6ca1\u6709\u63d0\u4f9b\u679a\u4e3e\u7c7b\u578b\uff0c\u4f46\u662f\u6211\u4eec\u4e5f\u53ef\u4ee5\u6839\u636eGo<\/code>\u8bed\u8a00\u7684\u4e24\u4e2a\u7279\u6027\uff1a\u5e38\u91cf\u548c\u5b9a\u4e49\u65b0\u7c7b\u578b\u6765\u5b9e\u73b0\u679a\u4e3e\uff0c\u65b9\u6cd5\u603b\u6bd4\u56f0\u96be\u591a\u5417\uff0c\u5f00\u6e90\u5e93\u662f\u4f18\u79c0\u7684\uff0c\u6211\u4eec\u5f80\u5f80\u53ef\u4ee5\u4ece\u9ad8\u624b\u90a3\u91cc\u91cc\u5b66\u4e60\u5f88\u591a\uff0c\u8bb0\u4f4f\uff0c\u8bf7\u6c38\u8fdc\u4fdd\u6301\u4e00\u4e2a\u5b66\u5f92\u4e4b\u5fc3\uff1b<\/p>\n
    \u597d\u5566\uff0c\u672c\u6587\u5230\u8fd9\u91cc\u5c31\u7ed3\u675f\u4e86\uff0c\u6211\u662fasong<\/strong>\uff0c\u6211\u4eec\u4e0b\u671f\u89c1\u3002<\/p>\n
    \u6b22\u8fce\u5173\u6ce8\u516c\u4f17\u53f7\uff1aGolang\u68a6\u5de5\u5382<\/strong><\/p>\n
    https:\/\/segmentfault.com\/a\/1190000042353300<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
    \u524d\u8a00 \u54c8\u55bd\uff0c\u5927\u5bb6\u597d\uff0c\u6211\u662fasong\u3002\u679a\u4e3e\u662f\u4e00\u79cd\u5f88\u91cd\u8981\u7684\u6570\u636e\u7c7b\u578b\uff0c\u5728java\u3001C\u8bed\u8a00\u7b49\u4e3b\u6d41\u7f16\u7a0b\u8bed\u8a00\u4e2d\u90fd\u652f\u6301\u4e86\u679a\u4e3e […]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-10006265","post","type-post","status-publish","format-standard","hentry"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006265","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10006265"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006265\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10006265"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10006265"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10006265"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}