What exactly is an instance in Java?

by

An object and an instance are the same thing.

Personally I prefer to use the word “instance” when referring to a specific object of a specific type, for example “an instance of type Foo”. But when talking about objects in general I would say “objects” rather than “instances”.

A reference either refers to a specific object or else it can be a null reference.

They say that they have to create an instance to their application. What does it mean?

They probably mean you have to write something like this:

Foo foo = new Foo();

If you are unsure what type you should instantiate you should contact the developers of the application and ask for a more complete example.

More Related Contents:

  1. What are classes, references, and objects?
  2. Java new keyword
  3. How do i get an object from another class in java
  4. Proper variable initialization and call from another class
  5. the difference between reference and object in java [duplicate]
  6. What is the difference between a variable, object, and reference? [duplicate]
  7. The difference between Classes, Objects, and Instances
  8. Can we instantiate an abstract class?
  9. What is the difference between identity and equality in OOP?
  10. Can we create an object of an interface?
  11. What is difference between references and objects in java? [duplicate]
  12. java StackOverflowError when local and instance objects creation
  13. What is the purpose of Serialization in Java?
  14. Difference Between Object Type and Reference Type
  15. Comparing Integer objects [duplicate]
  16. Duplicating objects in Java
  17. When do instance variables get initialized and values assigned?
  18. How can I access a private constructor of a class?
  19. Is it possible see all the references to an object in execution time?
  20. How do I copy an object in Java?
  21. What is an object’s hash code if hashCode() is not overridden?
  22. Default constructor vs. inline field initialization
  23. C++ equivalent of java’s instanceof
  24. How do you get the “object reference” of an object in java when toString() and hashCode() have been overridden?
  25. “Non-static variable this cannot be referenced from a static context” when creating an object
  26. Java: Overriding static variable of parent class?
  27. Why does every object in Java implicitly extend java.lang.Object class?
  28. Strings in Java : equals vs == [duplicate]
  29. In Python, when are two objects the same?
  30. Calling methods on reference variable vs Calling methods on a new object

Leave a Comment