Implementation of Java single-State mode (questions that won't be written, despise yourself)

1. Hunger:
Public class Singleton {
// Define an instance of the current user.
// Note that this is private for internal calls only
Private Static Singleton instance = new Singleton ();
// Set the constructor to private
Private Singleton (){
}
// Static factory method, which provides a static method for external use to obtain objects
Public static Singleton getinstance (){
Return instance;
}
}

2. Lazy style:

Public class Singleton {
Private Static Singleton instance = NULL;
Private Singleton (){
}
Public static synchronized Singleton getinstance (){
If (instance = NULL)
Instance = new Singleton ();
Return instance;
}
}