• What is a class?

Class is the blueprint for creating objects. 
It is a set of objects with similar characteristics and behavior
Characteristics are implemented through member variables.
and behavior is implemented through member functionx.

A class is just the logic; inorder to use it : we need objects.

• What is an object?

class employee{
name;
salary;

set Name(N){
name = N;
}
setSalary(S){
salary = S;
}
getSalary(){
return salary;
}
}

//The above is the blueprint

// to use the class

main(){
Employee objectName = new Emoployee();
objectName.setName("Raj");
objectName.setSalary(10000);

//We can use another object for another instance
Employee objectName2 = new Employee();
objectName.setName2("Ram");
objectName.setSalary(2000);

print(objectName.getSalary(); // prints : 1000
print(objectName2.getSalary();// prints : 2000
}

// This creates an instance of the class. 

• How are objects created and destroyed in the memory

2 types of memory:

1. Stack : runtime     ,  size is limited
2. Heap. : system.     ,  size is large 

In the heap mamory : we are storing the instance…

If the stack memory referencing it is no more there. : after a certain interval: internal garbage collector will work .

**Employee obj1 =** new Employee()

Stack               Pointed by Heap