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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. 		// your code goes here
  13. 		System.out.println(InstallmentTransaction.getInstance(10, false).toString());
  14. 	}
  15. }
  16.  
  17. class InstallmentTransaction {
  18.     private final int installments;
  19.     private final boolean interest;
  20.  
  21.     private static final Map<Integer, Map<Boolean, InstallmentTransaction>> instances = new HashMap<>();
  22.     private static final Object lockObject = new Object();
  23.  
  24.     private InstallmentTransaction(int installments, boolean interest)
  25.     {
  26.         this.installments = installments;
  27.         this.interest = interest;
  28.     }
  29.  
  30.     public static InstallmentTransaction getInstance(int installments, boolean interest){
  31.         synchronized(lockObject){
  32.             Map<Boolean, InstallmentTransaction> map = instances.get(installments);
  33.             if(map == null){
  34.                 map = new HashMap<>();
  35.                 instances.put(installments, map);
  36.             }
  37.             InstallmentTransaction instance = map.get(interest);
  38.             if(instance == null){
  39.                 instance = new InstallmentTransaction(installments, interest);
  40.                 map.put(interest, instance);
  41.             }
  42.             return instance;
  43.         }
  44.     }
  45.  
  46.     //getters go here
  47. }
Success #stdin #stdout 0.1s 320576KB
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InstallmentTransaction@52e922
https://ideone.com/RBwKvN
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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