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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. enum Rara {
  9.     MA_ON("ST"),
  10.     MA_MAN("ST", "YS"),
  11.     MA_IP("ST", "YS", "IC"),
  12.     CODE("RC");
  13.  
  14.     Rara(String... codes) {
  15.         this.codes = List.of(codes);
  16.     }
  17.  
  18.     private List<String> codes;
  19.  
  20.     private static List<String> commonElements(List<String> list1, List<String> list2) {
  21.         List<String> common = new ArrayList<>(list1); // to avoid modifying `list1`
  22.         common.retainAll(list2); // leaves in `common` only elements from `list2`
  23.         return common;
  24.     }
  25.  
  26.     public static Optional<Rara> getValue(List<String> values){
  27.         return Arrays.stream(values())
  28.                 .map(en -> Map.entry(en, commonElements(en.codes, values).size()))
  29.                 .filter(entry -> entry.getValue()>0)
  30.                 .max(Comparator.comparing(Map.Entry::getValue))
  31.                 .map(Map.Entry::getKey);
  32.     }
  33.  
  34. }
  35.  
  36.  class Ideone {
  37.     public static void main(String args[]){
  38.         System.out.println(Rara.getValue(Arrays.asList("ST", "YS")));
  39.         // Optional[MA_MAN]
  40.  
  41.         System.out.println(Rara.getValue(Arrays.asList("ST")));
  42.         // Optional[MA_ON]
  43.  
  44.         System.out.println(Rara.getValue(Arrays.asList("ST", "RC")));
  45.         // Optional[MA_ON]
  46.  
  47.         System.out.println(Rara.getValue(Arrays.asList("STB", "RCC")));
  48.         //Optional.empty
  49.     }
  50. }
  51.  
Success #stdin #stdout 0.11s 48792KB
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Optional[MA_MAN]
Optional[MA_ON]
Optional[MA_ON]
Optional.empty
https://ideone.com/SE80zq
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
public

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