迭代java中的地图集合

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如何迭代String，String的地图集合。迭代java中的地图集合

我有一个POJO类

 public class GPObject_PublicUser { 

    private String kind; 
    private String id; 
    private String displayName; 
    private String objectType; 
    private String gender; 
    private String aboutMe; 
    private String url; 


    private Map<String,String> image; 

    private Collection<Map<String,String>> placesLived; 



}

现在我转换字符串GSON并尝试将数据映射到POJO类。

  Gson gson = new Gson(); 
      GPObject_PublicUser hello =gson.fromJson(jsonText, GPObject_PublicUser.class);

样品JSON文本：

 { "kind": "plus#person", "etag": "\"goGJzLGpDAdTIjyZUs7et8jwqfg/dSQkZzjp1Ufk7Fq69sg0cCLCwLY\"", "occupation": "Global News Broadcaster", "gender": "other", "urls": [ { "value": "http://twitter.com/cctv_america", "type": "otherProfile", "label": "CCTV_America" }, { "value": "https://www.facebook.com/CCTVAmerica", "type": "otherProfile", "label": "Facebook" }, { "value": "http://www.cctv-america.com", "type": "contributor", "label": "CCTV-America.com" }, { "value": "http://www.cctv-america.com", "type": "other", "label": "Official Website" } ], "objectType": "person", "id": "105608978310637089588", "displayName": "CCTV America", "name": { "familyName": "America", "givenName": "CCTV" }, "tagline": "CCTV America contributes programming from Washington DC to CCTV News, the 24-hour English-language news channel of China Central Television", "aboutMe": "\u003cdiv\u003eCCTV America launched from Washington on Monday, February 6th 2012. Â It currently produces five hours of weekday programming seen on the North American east coast in the early evening hours. Â Programs include numerous daily news broadcasts as well as BIZ ASIA AMERICA, focusing on global economic trends, trade and investment.\u003c/div\u003e\u003cdiv\u003eâ€œThe Heat,â€? weekdays at 7pm EST provides talk-and-debate on a range of topical issues. &#39;Americas Now&#39; on Sunday nights provides in depth magazine coverage on Central and South American issues. Â It is the only regularly scheduled magazine program in the English language exploring Latin American issues.\u003c/div\u003e\u003cdiv\u003e\u003cbr /\u003e\u003c/div\u003e\u003cdiv\u003eCCTV America programming can be seen from 3pm EST\u003c/div\u003e\u003cdiv\u003eCOMCAST Channel 273, FIOS 277 in the greater Washington area.\u003c/div\u003e\u003cdiv\u003eIn New York watch Time Warner Channel 134.\u003c/div\u003e\u003cdiv\u003eIn Los Angeles watch Charter Cable Channel 562.\u003c/div\u003e\u003cdiv\u003eNationwide watch DISH TV channel 279.\u003c/div\u003e\u003cdiv\u003eCheck your cable TV listings for availability in different US locations.\u003c/div\u003e\u003cdiv\u003eExcerpts of all programming can be seen on \u003ca href=\"http://www.cctv-america.com\" rel=\"nofollow\" target=\"_blank\"\u003ewww.cctv-america.com\u003c/a\u003e.\u003c/div\u003e\u003cdiv\u003e\u003cbr /\u003e\u003c/div\u003e", "url": "https://plus.google.com/105608978310637089588", "image": { "url": "https://lh4.googleusercontent.com/-xiA6h0u4IO8/AAAAAAAAAAI/AAAAAAAAAMQ/Hv4BxXfO-_Q/photo.jpg?sz=50", "isDefault": false }, "organizations": [ { "name": "CCTV America", "type": "work", "startDate": "2012", "primary": true } ], "placesLived": [ { "value": "Washington, D.C., DC 20002, United States", "primary": true } ], "isPlusUser": true, "circledByCount": 101, "verified": false, "cover": { "layout": "banner", "coverPhoto": { "url": "https://lh3.googleusercontent.com/-c5Kov6t3y2o/U2KUhNrAClI/AAAAAAAAAME/RZEIUxBcMnk/s630-fcrop64=1,3ceb2465cd58ffff/facebook_banner.png", "height": 347, "width": 940 }, "coverInfo": { "topImageOffset": 0, "leftImageOffset": 0 } }}

现在我的问题是我怎么能遍历的placeLived来获取值。

来源

2014-07-19 bharathi

参见http://stackoverflow.com/questions/46898/how-do-i -ite-over-each-entry-in-a-map – Raedwald

我认为，即使粗略阅读Java引用，这也应该是显而易见的。这真的值得SO贴吗？ – balajeerc

另请参阅http://stackoverflow.com/questions/20654289/iterate-through-collectionlistinteger – Raedwald

我只是检查Google's javadoc退货类型为GPObject_PublicUser.placesLived。

Iterator<Map<String, String>> iterator = placesLived.iterator(); 

while (iterator.hasNext()) { 
    Map<String, String> place = iterator.next(); 
     for (Map.Entry<String, String> entry : place.entrySet()) { 
      String placeVar1 = entry.getKey(); 
      String placeVar2 = entry.getValue(); 
      // TODO 
     } 
    } 
}

作为一个温和的建议 - 做Java集合注意，他们是我们最好的武器之一;）

来源

2014-07-19 08:51:12 Mateva

你可以得到entrySet()并迭代使用先进的for循环。 Map.Entry类表示地图一对，它有两个属性key和value

for(Map<String, String> map : placesLived){ 
    Set<Map.Entry<String, String>> entrySet = map.entrySet();  
    for (Map.Entry<String, String> entry : entrySet) { 
     String key = entry.getKey(); 
     String value = entry.getValue(); 
    } 
}

来源

2014-07-19 08:36:39 bitkot

要遍历图的集合，你可以使用此：

for(Map<String, String> map : placesLived) { 
    for(Map.Entry<String, String> entry : map.entrySet()) { 
     String key = entry.getKey(); 
     String value = entry.getValue(); 

    } 
}

希望这有助于

来源

2014-07-19 08:39:02

迭代java中的地图集合

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