How can you create a singleton in Kotlin?

Kotlin - Interview Questions

We can create a singleton in Kotlin by using an object.

Syntax :

object SomeSingleton  â€‹

The above Kotlin object will be compiled to the following equivalent Java code:

public final class SomeSingleton {  
   public static final SomeSingleton INSTANCE;  
   private SomeSingleton() {  
      INSTANCE = (SomeSingleton)this;  
      System.out.println("init complete");  
   }  
   static {  
      new SomeSingleton();  
   }  
}  â€‹

The above way is preferred to implement singletons on a JVM because it enables thread-safe lazy initialization without relying on a locking algorithm like the complex double-checked locking.