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  1. //Thread-safe Singleton class with synchronized getInstance()
  2. class singleton{
  3.     private static singleton instance;
  4.     private singleton(){
  5.         System.out.println("An instance is created");
  6.     }
  7.     public static synchronized singleton getInstance(){
  8.         if(instance == null)
  9.         {
  10.             instance=new singleton();
  11.         }
  12.         return instance;
  13.     }
  14.     void method()
  15.     {
  16.         System.out.println("successfully executed!");
  17.     }
  18. }
  19.  
  20. public class Main{
  21.     public static void main(String[] args)
  22.     {
  23.         singleton obj1 = singleton.getInstance();
  24.         singleton obj2 = singleton.getInstance();
  25.  
  26.         obj1.method();
  27.  
  28.         if(obj1 == obj2)
  29.         {
  30.             System.out.println("Whatever!");
  31.         }
  32.         else{
  33.             System.out.println("porashuna koro toh? porte hobe! nokol ar hobe na!");
  34.         }
  35.     }
  36. }
Success #stdin #stdout 0.07s 52468KB
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Standard input is empty
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An instance is created
successfully executed!
Whatever!
https://ideone.com/z4f4E8
language:
Java (HotSpot 12)
created:
2 days ago
visibility:
public

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