feat: Demonstrate use of instance variables with unique data per Student object [object-instance-variables]

📌 Core Concept:
Showcases how instance variables store object-specific data and how each instance of a class maintains its own state.

🎓 Program Overview:
- `Student` class:
  - Instance Variables: `name`, `gpa` – unique for every object.
  - Constructor initializes these per-student attributes.
  - `display()` method outputs student-specific information.

- `InstanceVariable` class:
  - Creates two `Student` objects with different values.
  - Calls `display()` on each to demonstrate data encapsulation.

🧪 Behavior:
- `s1` and `s2` have independent `name` and `gpa` values.
- Modifying one object’s data has no effect on the other.

📌 Key Features:
- Object-level encapsulation using instance variables.
- Demonstrates per-instance memory allocation and behavior.

✅ Useful pattern for:
- Modeling real-world entities with unique properties.
- Understanding how object-oriented programming handles data separation.

Signed-off-by: Somesh diwan <[email protected]>

Author: Someshdiwan

Section10Methods/LocalandGlobalVariables/src/InstanceVariable.java

@@ -1,7 +1,3 @@
-/* An instance variable belongs to an object and is created when the object is instantiated.
-   Each object has its own copy of instance variables.
-*/
-
 class Student {
     private String name;  // Instance variable
     private double gpa;   // Instance variable
@@ -29,7 +25,11 @@ public static void main(String[] args) {
     }
 }
 
-/* Key Features:
+/*
+An instance variable belongs to an object and is created when the object is instantiated.
+Each object has its own copy of instance variables.
+
+Key Features:
 Each Student object has its own name and gpa.
 Changing values for one object does not affect the other.
-*/
+*/