💻 Step 4:Classes and Objects : 2nd hour




💡 -> Class is a blueprint or template from which objects are created.

💡 -> Class is a logical representation of object.

💡 -> A class can have data members, objects, constructors, methods, nested classes etc

💡 -> Class doesn’t allocated memory when it is created.

💡 -> Class defines data members and methods which objects can implement.

Syntax –

class className{





💡-> Object is an instance of a class

💡-> Object is considered as a real world thing.

💡-> Object is a physical entity.

💡-> Object uses data/state and methods/behaviour.

💡-> Object allocates memory when it is created.

Syntax(in general)-

ClassName objectName= new ConstructorName();

Note- ways to create object in java – new keyword(most popular), newInstance() method, clone() method, factory method and deserialization.

Interview Questions —

  • What is class in real world example?
  • Can object be created without class?
  • Who uses all methods and data defined in any class?

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