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  1. import java.util.*;
  2.  
  3. class SortOrder {
  4.     public static final Map<String, Integer> SORT_ORDER = initializeSortOrder();
  5.  
  6.     private static Map<String, Integer> initializeSortOrder() {
  7.         List<String> orderedStrings = Arrays.asList(
  8.                 "A",
  9.                 "B",
  10.                 "D",
  11.                 "C",
  12.                 "E",
  13.                 "F"
  14.         );
  15.         Map<String, Integer> indexByString = new HashMap<>();
  16.         for (int index = 0; index < orderedStrings.size(); ++index) {
  17.             indexByString.put(orderedStrings.get(index), index);
  18.         }
  19.         return Collections.unmodifiableMap(indexByString);
  20.     }
  21.  
  22.     public static void main(String[] args) {
  23.         List<String> testData = new ArrayList<>(Arrays.asList(
  24.                 "B", "C", "D", "E", "A"
  25.         ));
  26.  
  27.         Collections.sort(testData, new Comparator<String>() {
  28.             @Override
  29.             public int compare(String s1, String s2) {
  30.                 return SORT_ORDER.get(s1).compareTo(SORT_ORDER.get(s2));
  31.             }
  32.         });
  33.  
  34.         System.out.println(testData);
  35.     }
  36.  
  37. }
  38.  
Success #stdin #stdout 0.07s 380224KB
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Standard input is empty
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[A, B, D, C, E]
https://ideone.com/2bzzpm
language:
Java (12.0.1)
created:
10 years ago
visibility:
public

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