singleton with volatile in java

Question

class MyClass
{
      private static volatile Resource resource;

      public static Resource getInstance()
      {
            if(resource == null)
                        


        

Answer 1

I think, you should use syncronized keyword before getInstance definition.

For better performance you can use Double-checked locking pattern:

• Double-checked locking and the Singleton pattern on IBM
• Double-checked locking on Wiki