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POHow to sort HashMap<String, String[]> by String in android
 

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  1. POHow to sort HashMap<String, String[]> by String in android
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    <p>I have this code: </p> <pre><code> HashMap&lt;String, String[]&gt; unsorted = new HashMap&lt;String, String[]&gt;(); String[] values = new String[3]; String key; //add data to hashmap key = "abc"; values[0] = "a"; values[1]="b"; values[2]="c"; unsorted.put(key, values); key = "abc"; values[0] = "aa"; values[1]="bb"; values[2]="cb"; unsorted.put(key, values); key = "def"; values[0] = "d"; values[1]="e"; values[2]="f"; unsorted.put(key, values); //sort hashmap /***********/ //output should be: { abc-[a,b,c], abc-[aa,bb,cc], def-[d,e,f] } //or { abc-[aa,bb,cc], abc-[a,b,c], def-[d,e,f] } </code></pre> <p>How can I sort it like that? Note: I tried with using TreeMap, and other examples, but they eliminate the elements where the <em>keys</em> are equal.</p> <p><strong>Edit:</strong> I solved my problem :) thanks to Guillaume. Here is what I used:</p> <pre><code>import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; public class test { public static void main(String[] args) { ArrayList&lt;CustomObject&gt; objs = new ArrayList&lt;CustomObject&gt;(); objs.add(new CustomObject("abc", new String[] {"a", "b", "c"})); objs.add(new CustomObject("def", new String[] {"d", "e", "f"})); objs.add(new CustomObject("abc", new String[] {"aa", "bb", "cc"})); System.out.println(objs.isEmpty()); Collections.sort(objs, new Comparator&lt;CustomObject&gt;() { @Override public int compare(CustomObject o1, CustomObject o2) { int i = o1.getKey().compareTo(o2.getKey()); if(i == 0) return -1; return i; } }); for(int i=0; i&lt;objs.size(); i++) System.out.println("key/value pair:" + objs.get(i).getKey() + " - " + objs.get(i).getValues()[0]); } } </code></pre> <p>And the CustomObject:</p> <pre><code>public class CustomObject { private String key; private String[] values; public CustomObject(String key, String[] values) { this.key = key; this.values = values; } public String getKey() { return key; } public String[] getValues() { return values; } } </code></pre>
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    1. USOvidiu Birgu
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      1. USSfawjp Awfipfawjp
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    1. COA map is **supposed** to have only one element for each key. Why don't you put in string arrays in your TreeMap, as you do with the HashMap?
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      1. USPontus Gagge
    2. CONote that, if you ever need to have your elements in a map in natural order based on a comparator, use the implementation TreeMap, not the HashMap. No Map implementation in the JDK allows duplicate keys.
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      1. USThomas Johan Eggum
 

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