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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. 	private static HashMap<String, HashMap<String, ArrayList>> parentMap = new HashMap<>();
  11.  
  12.   public static ArrayList<String> getMap(String parentkey, String childKey) {
  13.     return parentMap.get(parentkey).get(childKey);
  14.   }
  15.  
  16.  
  17.   public static ArrayList<String> setMap(String parentkey, String childKey, String value) {
  18.     parentMap.computeIfAbsent(parentkey, k->new HashMap<>());
  19.     HashMap<String, ArrayList> childMap = parentMap.get(parentkey);
  20.     childMap.computeIfAbsent(childKey, k -> new ArrayList<>()).add(value);
  21.     return getMap(parentkey, childKey);
  22.   }
  23.  
  24.   public static void main(String[] args) {
  25.     setMap("India", "EmployeeName", "A");
  26.     setMap("India", "EmployeeName", "B");
  27.     setMap("India", "EmployeeName", "C");
  28.     setMap("China", "EmployeeName", "D");
  29.     setMap("China", "EmployeeName", "E");
  30.     setMap("China", "EmployeeName", "F");
  31.     System.out.println("India" + getMap("India", "EmployeeName"));
  32.     System.out.println("China" + getMap("China", "EmployeeName"));
  33.   }
  34. }
Success #stdin #stdout 0.12s 50256KB
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Standard input is empty
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India[A, B, C]
China[D, E, F]
https://ideone.com/sMelyE
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
secret

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