public class JGKSingleton
{
/* Here is the instance of the Singleton */
private static JGKSingleton instance_;
/* Need the following object to synchronize */
/* a block */
private static Object syncObject_;
/* Prevent direct access to the constructor*/
private JGKSingleton()
{
super();
}
public static JGKSingleton getInstance()
{
/* in a non-thread-safe version of a Singleton the following line could be executed, and the */
/* thread could be immediately swapped out */
if (instance_ == null)
{
synchronized(syncObject_)
{
if (instance_ == null)
{
instance_ = new JGKSingleton();
}
}
}
return instance_;
}
}