Java: Lazy Initializing Singleton

Question

The pattern to create singletons seems to be something like:

public class Singleton {
    private static final Singleton instance = new Singleton();
    priv         


        

Answer 1

Double-checked locking is broken in every language, not just Java.

I tend to eschew singletons, but you can use the holder pattern just fine if you need them, as recommended in Josh Bloch's Effective Java:

public class Foo
{
  static class Holder
  {
    static final Foo instance = new Foo();
  }

  public static Foo getInstance()
  {
    return Holder.instance;
  }

  private Foo()
  {
  }

  // ...
}

EDIT: Repaired the reference.