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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main(String[] args) {
  11.         List<LinkedHashMap<String, String>> haystack = new ArrayList<>();
  12.  
  13.         LinkedHashMap<String, String> currentHashMap = new LinkedHashMap<String, String>();
  14.         currentHashMap.put("id","12345");
  15.         currentHashMap.put("firstName","John");
  16.         currentHashMap.put("lastName", "Doe");
  17.  
  18.         haystack.add(currentHashMap);
  19.  
  20.         currentHashMap = new LinkedHashMap<String, String>();
  21.         currentHashMap.put("id","54321");
  22.         currentHashMap.put("firstName","Jack");
  23.         currentHashMap.put("lastName", "Sparrow");
  24.  
  25.         haystack.add(currentHashMap);
  26.  
  27.  
  28.         TreeSet<String> result = searchWithinCollection(haystack, "12345", "id");
  29.         System.out.println("result = " + result);
  30.     }
  31.  
  32.     private static TreeSet<String> searchWithinCollection(List<LinkedHashMap<String, String>> haystack, String needle, String needleKey) {
  33.  
  34.         TreeSet<String> returnValueSet = new TreeSet<>();
  35.  
  36.         for (Map<String, String> mappedData : haystack) {
  37.             String value = mappedData.get(needleKey);
  38.             if (needle.equals(value)) {
  39.                 returnValueSet.addAll(mappedData.values());
  40.             }
  41.         }
  42.  
  43.         return returnValueSet;
  44.     }
  45. }
Success #stdin #stdout 0.13s 320576KB
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Standard input is empty
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result = [12345, Doe, John]
https://ideone.com/ldnGNF
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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