{"id":31451,"date":"2023-12-07T10:28:51","date_gmt":"2023-01-18T11:16:40","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e7%9a%84%e6%b3%9b%e5%9e%8b%ef%bc%88%e5%a4%87%e5%bf%98%e5%bd%95%ef%bc%89\/"},"modified":"2024-05-04T12:30:33","modified_gmt":"2024-05-04T04:30:33","slug":"java%e7%9a%84%e6%b3%9b%e5%9e%8b%ef%bc%88%e5%a4%87%e5%bf%98%e5%bd%95%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e7%9a%84%e6%b3%9b%e5%9e%8b%ef%bc%88%e5%a4%87%e5%bf%98%e5%bd%95%ef%bc%89\/","title":{"rendered":"Java\u7684\u6cdb\u578b\uff08\u5907\u5fd8\u5f55\uff09"},"content":{"rendered":"

\u5177\u6709List\u503c\u7684Map<\/h3>\n

\u8981\u6c42\uff1a
\n\u4e00\u4e2a\u8981\u6c42\u662f\uff0c\u5047\u8bbeMap\u7684\u503c\u662f\u4e00\u4e2aList\uff0c\u5e76\u4e14\u8fd9\u4e2aList\u4e2d\u7684\u5bf9\u8c61\u6ee1\u8db3Child\u662fParent\u7684\u5173\u7cfb\u3002\u8fd8\u6709\uff0c\u6bcf\u4e2aList\u5b9e\u4f8b\u90fd\u5b58\u5728\uff0c\u5e76\u4e14\u5e0c\u671b\u5c06List\u4e2d\u7684\u5bf9\u8c61\u4f5c\u4e3aParent\u8fdb\u884c\u5904\u7406\u3002<\/p>\n

\u8bf7\u6307\u51fa\u95ee\u9898\u6240\u5728<\/h4>\n

\u7531\u4e8e\u6cdb\u578b\u4e0d\u5177\u5907\u5171\u53d8\u6027\uff0c\u56e0\u6b64\u4ee5\u4e0b\u64cd\u4f5c\u65e0\u6cd5\u5b9e\u73b0\u3002<\/p>\n

Map<\/span><<\/span>Key<\/span>,<\/span> List<\/span><<\/span>Parent<\/span>>><\/span> map1<\/span>;<\/span>\r\nMap<\/span><<\/span>Key<\/span>,<\/span> List<\/span><<\/span>Child<\/span>>><\/span> map2<\/span>;<\/span>\r\nmap1<\/span> =<\/span> map2<\/span>;<\/span>  \/\/ \u3053\u3053\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/span>\r\n<\/code><\/pre>\n
\u56e0\u6b64\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u901a\u914d\u7b26\u3002\u7136\u800c\uff0c\u4ee5\u4e0b\u4e5f\u4e0d\u53ef\u884c\u3002<\/p>\n
Map<\/span><<\/span>Key<\/span>,<\/span> List<\/span><?<\/span> extends<\/span> Parent<\/span>>><\/span> map1<\/span>;<\/span>\r\nMap<\/span><<\/span>Key<\/span>,<\/span> List<\/span><<\/span>Child<\/span>>><\/span> map2<\/span>;<\/span>\r\nmap1<\/span> =<\/span> map2<\/span>;<\/span> \/\/ \u3053\u3053\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u662f<\/p>\n
List<\/span><?<\/span> extends<\/span> Parent<\/span>><\/span> list1<\/span>;<\/span>\r\nList<\/span><<\/span>Child<\/span>><\/span> list2<\/span>;<\/span>\r\nlist1<\/span> =<\/span> list2<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u6211\u89c9\u5f97\u8fd9\u662f\u5947\u602a\u7684\uff0c\u5c3d\u7ba1\u5b83\u662f\u53ef\u884c\u7684\u3002\u7136\u540e\uff0c\u4e0b\u9762\u662f\u6b63\u786e\u7b54\u6848\u3002<\/p>\n
Map<\/span><<\/span>Key<\/span>,<\/span> ?<\/span> extends<\/span> List<\/span><?<\/span> extends<\/span> Parent<\/span>>><\/span> map1<\/span>;<\/span>\r\nMap<\/span><<\/span>Key<\/span>,<\/span> List<\/span><<\/span>Child<\/span>>><\/span> map2<\/span>;<\/span>\r\nmap1<\/span> =<\/span> map2<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u5c31\u50cf\u4f60\u6240\u770b\u5230\u7684\uff0c\u5fc5\u987b\u4f7f\u7528\u4e24\u6b21\u901a\u914d\u7b26\u3002
\n\u6211\u5229\u7528\u8fd9\u4e2a\u6765\u5b9a\u4e49\u5e76\u6267\u884c\u4e86\u4e00\u4e2a\u65b9\u6cd5\u3002<\/p>\n
  List<\/span><<\/span>Integer<\/span>><\/span> ilist<\/span> =<\/span> new<\/span> ArrayList<\/span><<\/span>Integer<\/span>>();<\/span>\r\n  ilist<\/span>.<\/span>add<\/span>(<\/span>1<\/span>);<\/span>\r\n  ilist<\/span>.<\/span>add<\/span>(<\/span>2<\/span>);<\/span>\r\n  ilist<\/span>.<\/span>add<\/span>(<\/span>3<\/span>);<\/span>         \r\n\r\n  Map<\/span><<\/span>String<\/span>,<\/span> List<\/span><<\/span>Integer<\/span>>><\/span> imap<\/span> =<\/span> new<\/span> HashMap<\/span><<\/span>String<\/span>,<\/span> List<\/span><<\/span>Integer<\/span>>>();<\/span>\r\n  imap<\/span>.<\/span>put<\/span>(<\/span>\"1\"<\/span>,<\/span> ilist<\/span>);<\/span>\r\n  doit<\/span>(<\/span>imap<\/span>);<\/span>\r\n\r\n  public<\/span> void<\/span> doit<\/span>(<\/span>Map<\/span><<\/span>String<\/span>,<\/span> ?<\/span> extends<\/span> List<\/span><?<\/span> extends<\/span> Number<\/span>>><\/span> inmap<\/span>)<\/span> {<\/span>\r\n      for<\/span> (<\/span>String<\/span> key<\/span> :<\/span> inmap<\/span>.<\/span>keySet<\/span>())<\/span> {<\/span>\r\n          System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"key = \"<\/span> +<\/span> key<\/span>);<\/span>\r\n          List<\/span><?<\/span> extends<\/span> Number<\/span>><\/span> list<\/span> =<\/span> inmap<\/span>.<\/span>get<\/span>(<\/span>key<\/span>);<\/span>\r\n          for<\/span> (<\/span>Number<\/span> n<\/span> :<\/span> list<\/span>)<\/span> {<\/span>\r\n              System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>n<\/span>);<\/span>\r\n          }<\/span>\r\n      }<\/span> \r\n  }<\/span>\r\n<\/code><\/pre>\n
\u989d\u5916\u7684\uff1a<\/p>\n
\u8fd4\u56de\u4e00\u4e2a\u5177\u6709List\u4f5c\u4e3a\u503c\u7684Map\u7684\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u4eceList\u4e2d\u83b7\u53d6\u8be5\u503c\u3002<\/p>\n
\u7b2c\u4e00\u4e2a\u9009\u9879<\/p>\n
public<\/span> <<\/span>V<\/span>,<\/span> K<\/span> extends<\/span> T<\/span>,<\/span> T<\/span>><\/span> Map<\/span><<\/span>V<\/span>,<\/span> List<\/span><?<\/span> extends<\/span> T<\/span>>><\/span> convert<\/span>(<\/span>Map<\/span><<\/span>V<\/span>,<\/span> List<\/span><<\/span>K<\/span>>><\/span> srcMap<\/span>)<\/span> {<\/span>\r\n    Map<\/span><<\/span>V<\/span>,<\/span> List<\/span><?<\/span> extends<\/span> T<\/span>>><\/span> dstMap<\/span> =<\/span> new<\/span> HashMap<\/span><<\/span>V<\/span>,<\/span> List<\/span><?<\/span> extends<\/span> T<\/span>>>();<\/span>\r\n    for<\/span> (<\/span>V<\/span> key<\/span> :<\/span> srcMap<\/span>.<\/span>keySet<\/span>())<\/span> {<\/span>\r\n        dstMap<\/span>.<\/span>put<\/span>(<\/span>key<\/span>,<\/span> srcMap<\/span>.<\/span>get<\/span>(<\/span>key<\/span>));<\/span>\r\n    }<\/span>\r\n    return<\/span> dstMap<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7b2c\u4e8c\u4e2a<\/p>\n
public<\/span> <<\/span>V<\/span>,<\/span> K<\/span> extends<\/span> T<\/span>,<\/span> T<\/span>><\/span> Map<\/span><<\/span>V<\/span>,<\/span> List<\/span><<\/span>T<\/span>>><\/span> toUpper<\/span>(<\/span>Map<\/span><<\/span>V<\/span>,<\/span> List<\/span><<\/span>K<\/span>>><\/span> srcMap<\/span>)<\/span> {<\/span>\r\n    Map<\/span><<\/span>V<\/span>,<\/span> List<\/span><<\/span>T<\/span>>><\/span> dstMap<\/span> =<\/span> new<\/span> HashMap<\/span><<\/span>V<\/span>,<\/span> List<\/span><<\/span>T<\/span>>>();<\/span>\r\n    for<\/span> (<\/span>V<\/span> key<\/span> :<\/span> srcMap<\/span>.<\/span>keySet<\/span>())<\/span> {<\/span>\r\n        List<\/span><<\/span>T<\/span>><\/span> tlist<\/span> =<\/span> new<\/span> ArrayList<\/span><<\/span>T<\/span>>();<\/span>\r\n        for<\/span> (<\/span>K<\/span> val<\/span> :<\/span> srcMap<\/span>.<\/span>get<\/span>(<\/span>key<\/span>))<\/span> {<\/span>\r\n            tlist<\/span>.<\/span>add<\/span>(<\/span>val<\/span>);<\/span>\r\n        }<\/span>\r\n        dstMap<\/span>.<\/span>put<\/span>(<\/span>key<\/span>,<\/span> tlist<\/span>);<\/span>\r\n    }<\/span>\r\n    return<\/span> dstMap<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u53ef\u80fd\u662f\u56e0\u4e3a\u300c2\u300d\u66f4\u597d\u3002\u4e3a\u4ec0\u4e48\u8fd9\u4e48\u8bf4\u5462\uff1f\u56e0\u4e3a\u8fd4\u56de\u7c7b\u578b\u662fMap<V\uff0cList>\u3002\u6839\u636e\u300aEffective Java\u300b\uff0c\u8ba9\u8c03\u7528\u65b9\u5728\u6267\u884c\u6b64\u65b9\u6cd5\u65f6\u610f\u8bc6\u5230\u901a\u914d\u7b26\uff08\u4f8b\u5982\uff0cList<? extends T>\uff09\u4e0d\u662f\u4e00\u4e2a\u597d\u65b9\u6cd5\uff08\u6211\u731c\u7684\uff09\u3002<\/p>\n
\u5982\u679c\u6709\u4efb\u4f55\u9519\u8bef\uff0c\u8bf7\u6307\u51fa\u6765\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5177\u6709List\u503c\u7684Map \u8981\u6c42\uff1a \u4e00\u4e2a\u8981\u6c42\u662f\uff0c\u5047\u8bbeMap\u7684\u503c\u662f\u4e00\u4e2aList\uff0c\u5e76\u4e14\u8fd9\u4e2aList\u4e2d\u7684\u5bf9\u8c61\u6ee1\u8db3Chil […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31451","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nJava\u7684\u6cdb\u578b\uff08\u5907\u5fd8\u5f55\uff09 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u7684\u6cdb\u578b\uff08\u5907\u5fd8\u5f55\uff09\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u7684\u6cdb\u578b\uff08\u5907\u5fd8\u5f55\uff09\" \/>\n<meta property=\"og:description\" content=\"\u5177\u6709List\u503c\u7684Map \u8981\u6c42\uff1a \u4e00\u4e2a\u8981\u6c42\u662f\uff0c\u5047\u8bbeMap\u7684\u503c\u662f\u4e00\u4e2aList\uff0c\u5e76\u4e14\u8fd9\u4e2aList\u4e2d\u7684\u5bf9\u8c61\u6ee1\u8db3Chil […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u7684\u6cdb\u578b\uff08\u5907\u5fd8\u5f55\uff09\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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