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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) throws java.lang.Exception
  11. 	{
  12. 		System.out.println(Messages.isMessageInGroup("Another Message"));
  13. 	}
  14.  
  15. }
  16.  
  17. enum Messages {
  18.  
  19.     MESSAGE_1("Message", "Category"),
  20.     MESSAGE_2("Another Message", "Category"),
  21.     MESSAGE_3("Odd Message", "Another Category");
  22.  
  23.     private static final Map<String, Set<String>> map;
  24.     static {
  25.         Map<String, Set<String>> tempMap = new HashMap<>();
  26.         for (Messages m : Messages.values()) {
  27.             tempMap.computeIfAbsent(m.category, s -> new HashSet<>()).add(m.message);
  28.         }
  29.         map = Collections.unmodifiableMap(tempMap);
  30.     }
  31.  
  32.     private final String message, category;
  33.  
  34.     private Messages(String message, String category) {
  35.         this.message = message;
  36.         this.category = category;
  37.     }
  38.  
  39.     public String getMessage() { return message; }
  40.     public String getCategory() { return category; }
  41.  
  42.     public static boolean isMessageInGroup(String message){
  43.         // use `getOrDefault` if `get` could return null!!
  44.         return map.get("Category").contains(message);
  45.     }
  46.     public static Set<String> messagesInGroup(String category) {
  47.     	return Collections.unmodifiableSet(
  48.         	map.getOrDefault(category, Collections.emptySet())
  49.     	);
  50. 	}
  51. }
Success #stdin #stdout 0.22s 320704KB
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https://ideone.com/VLrEZm
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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