Differences between Object and Instance

Differences between Object and Instance

There is a lot of discussions on this topic over the internet. Some of the people says both are same and some of other says both are different. Here I am planning to share my overall view on this topic. As per my knowledge both are looks same but different. Here are the some useful points:

• Instance is Logical but object is Physical means occupies some memory.
• We can create an instance for abstract class as well as for interface, but we cannot create an object for those.
• Object is instance of class and instance means representative of class i.e object.
• Instance refers to Reference of an object.
• Object is actually pointing to memory address of that instance.
• You can’t pass instance over the layers but you can pass the object over the layers
• You can’t store an instance but you can store an object
• A single object can have more than one instance.
• Instance will have the both class definition and the object definition where as in object it will have only the object definition.

Syntax of Object:

classname var = new classname();

Syntax of Instance:

classname varname; 

But for instance creation it returns only a pointer refering to an object, syntax is :