How to implement thread-safe lazy initialization?

by

For singletons there is an elegant solution by delegating the task to the JVM code for static initialization.

public class Something {
    private Something() {
    }

    private static class LazyHolder {
            public static final Something INSTANCE = new Something();
    }

    public static Something getInstance() {
            return LazyHolder.INSTANCE;
    }
}

see

http://en.wikipedia.org/wiki/Initialization_on_demand_holder_idiom

and this blog post of Crazy Bob Lee

http://blog.crazybob.org/2007/01/lazy-loading-singletons.html

More Related Contents:

  1. Why is Java’s SimpleDateFormat not thread-safe? [duplicate]
  2. Is java.sql.Connection thread safe?
  3. Java synchronized method lock on object, or method?
  4. Is iterating ConcurrentHashMap values thread safe?
  5. Is a HashMap thread-safe for different keys?
  6. Is HttpSession thread safe, are set/get Attribute thread safe operations?
  7. Thread safe multitons in Java
  8. Why are local variables thread safe in Java
  9. Is a volatile int in Java thread-safe?
  10. Must Spring component classes be thread-safe
  11. Should we use EventQueue.invokeLater for any GUI update in a Java desktop application?
  12. Which Swing component methods are thread safe?
  13. How to stop a thread created by implementing runnable interface?
  14. What is thread Safe in java? [duplicate]
  15. Throttling javafx gui updates
  16. Are primitive datatypes thread-safe in Java
  17. Are non-synchronised static methods thread safe if they don’t modify static class variables?
  18. Is it OK to use Gson instance as a static field in a model bean (reuse)?
  19. How do I prove programmatically that StringBuilder is not threadsafe?
  20. final fields and thread-safety
  21. Java Synchronization [closed]
  22. Is Cipher thread-safe?
  23. How to get the Context from anywhere? [duplicate]
  24. Is LinkedList thread-safe when I’m accessing it with offer and poll exclusively?
  25. Explain the timing causing HashMap.put() to execute an infinite loop
  26. executing block of code atomically
  27. Pattern for lazy thread-safe singleton instantiation in java
  28. Not thread-safe Object publishing
  29. Regarding thread safety of servlet [duplicate]
  30. Threads – Why a Lock has to be followed by try and finally

Leave a Comment