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POJava: Sorting a Map, Map<Long,Map<String, Data>> based on the inner map
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18954767
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18955029
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1
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5
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2013-09-23T08:27:59.210
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2013-09-24T10:30:31.690
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2013-09-23T11:59:07.707
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2236033
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1
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479
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I am new to java and is still in the learning phase. I have a structure <pre><code>Map<Long, Map<String, Data>> mapData </code></pre> <code>Data</code> has 2 fields <code>time</code> and <code>distance</code> and the <code>Map</code> has a time which is a <code>Long</code> field and <code>map</code> with <code>Identifier</code> and <code>Data</code> the structure looks like this <pre><code>{190001919 = {[1= [data1], 2=[data2], 3=[data3]}, 190001920={[1=[data4], 2=[data5], 3=[data6]}, 1900019121= {[1=[data7], 2=[data8], 3=[data9]}} </code></pre> and then convert it into a map - <code>Map<String,List<Data>> mpData</code> with <code>idenifier</code> as <code>key</code> and <code>values</code> as the values where there the identifier was the same. like <pre><code>{1= [data1,data4,data7], 2= [data2,data5,data8],3= [data3,data6,data9]} </code></pre> Could some one please help me? Update: With the below code, I get <pre><code>{1= [data7,data7,data7], 2= [data8,data8,data8],3= [data9,data9,data9]} </code></pre> instead of <pre><code> {1= [data1,data4,data7], 2= [data2,data5,data8],3= [data3,data6,data9]} </code></pre> Code: <pre><code>public static Map<Long, Map<String, Data>> listData; public static Map<String, List<Data>> mapData; public convertMapData(Map<Long, Map<String, Data>> array) { listData = new HashMap(); listData = array; mapData = new HashMap<>(); Iterator it = listData.entrySet().iterator(); while (it.hasNext()) { Map.Entry<Long, Map<String, Data>> pairs = (Map.Entry) it .next(); Long keyValue = pairs.getKey(); Map inter = pairs.getValue(); Iterator it2 = inter.entrySet().iterator(); while (it2.hasNext()) { Map.Entry<String, Data> pairs_2 = (Map.Entry) it2 .next(); String identifierK = pairs_2.getKey(); Data resultV = pairs_2.getValue(); if (!(mapData.containsKey(identifierK))) { mapData.put(identifierK, new ArrayList<Data>()); } mapData.get(identifierK).add(resultV); } } } </code></pre>
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Java: Sorting a Map, Map<Long,Map<String, Data>> based on the inner map
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