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Difference Between Class & Object in Java

Quick Summary & Key Takeaways

  • • Subject Focus: Java Notes in English (BCA / B.Tech Syllabus)
  • • Core Topic: Difference Between Class & Object in Java - General Topics
  • • Overview: Key Differences Between a Class and an Object While fundamentally related, a class and an object represent different concepts in Java. The clearest way...
  • • Key Concepts: Class और Object में अंतर, Class vs Object in Hindi, OOP concepts, Object और Class का उपयोग, Object Oriented Programming in Hindi,

Key Differences Between a Class and an Object

While fundamentally related, a class and an object represent different concepts in Java. The clearest way to see the distinction is through a direct comparison.


Basis of Comparison Class Object
Definition A blueprint or template that defines attributes and methods. A real-world entity that is an instance of a class.
Nature It is a logical entity. It is a physical entity.
Memory Allocation No memory is allocated when a class is defined. Memory is allocated on the heap whenever an object is created.
Existence Exists at compile-time. Created and exists at run-time.
Declaration Declared once using the class keyword. Can be created many times as needed using the new keyword.
Analogy A recipe for a cake. The actual cake baked from the recipe.

In summary, a class is the definition, and an object is the embodiment of that definition. You cannot have an object without a class, just as you cannot build a house without a blueprint.

Frequently Asked Questions (FAQs)

Key Differences Between a Class and an Object While fundamentally related, a class and an object represent different concepts in Java.
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