[Java]What is the Object and Object reference ?

• In Java, all objects are accessed by reference, and you never have direct access to the object itself.
• Reference :- is a variable that has a name and can be used to access the contents of an object, A reference can be assigned to another reference passed to a method, or returned from a method.
  
  default value of object reference is  "null";
  
  

               MyClass object ; 

• Object:- is an entity that's exists in memory allocated by the Java run time environment, An object sits on the heap memory when we create an object like
  
  
  
  

               MyClass object=new MyClass();

  
  It created the object and respective address and stored in the reference variable named "object".
• Then what will happen if we create object with out reference like
  
  

   new MyClass();

  
  In this case object will be created in heap memory but there is no reference.
  So, you can't reuse this object.
  

     System.out.println(new MyClass().a);

  
  Once above statement is executed then garbage collector will destroy the object.
  
  Note: Garbage collector immediately won't invoke this is depends upon the CPU free time. Whenever CPU gets free time then it will come to destroy the unused and unreferenced object.