Java- Object Instantiation

class ObjInstantiation {
 public static void main(String[] args) {
  
  new Greet().showGreeting();//Nameless object

  Greet g = new Greet();
  g = new Greet();//implicit deref.
  g.showGreeting();
  g = null;//explicit deref.
  g.showGreeting();// NullPointerException
 }
}

class Greet {
 void showGreeting() {
  System.out.println("Hello World!");
 }
}

Note:  Greet g;  -  loads Greet.class to the memory.
       creates a reference variable (g) for class Greet.
  g = new Greet() - creates a new object of class Greet.
assigns the object’s address to the reference variable g.