feat: Demonstrate use of super keyword for accessing parent variables and methods

WHAT the code does:
- Defines base class Vehical:
  - int maxSpeed = 120.
  - Method vroom() prints "Vroom Vroom".
- Defines subclass Car2:
  - Declares its own int maxSpeed = 100, hiding the parent field.
  - display() uses super.maxSpeed to access the parent’s variable (prints 120).
  - Overrides vroom() but calls super.vroom() inside, reusing the parent implementation.
- main():
  - Creates Car2 instance.
  - Calls display() → prints parent’s maxSpeed (120).
  - Calls vroom() → executes Vehical’s vroom() via super, printing "Vroom Vroom".

WHY this matters:
- Shows **field hiding** vs **method overriding**:
  - Fields in Java are hidden, not overridden. `super.maxSpeed` allows access to parent’s version.
  - Methods can be overridden. Using `super.methodName()` allows calling the parent’s version.
- Demonstrates **super keyword usage**:
  - Access parent’s variables when child defines its own with the same name.
  - Call parent’s methods from an overridden method in the child.
  - Also usable to call parent constructors (`super(...)`), though not shown here.

HOW it works:
1. new Car2() creates an object with both parent and child fields (two copies of maxSpeed).
2. display() prints parent’s field (120).
3. Car2.vroom() executes, which explicitly calls Vehical.vroom() using super → "Vroom Vroom".

Tips and gotchas:
- Use `super` when the child needs to leverage or extend behavior of the parent.
- Fields don’t participate in polymorphism — accessing `maxSpeed` without super in Car2 would give 100, but with super it gives 120.
- Always call super() in constructors if the parent has required initialization.

Use-cases / analogies:
- Child reusing parent’s “tools” (methods or data) while also defining its own versions.
- Like a son saying “I’ll use my father’s way of driving” (`super.vroom()`) but also having his own car speed field.

Short key: java super-keyword method-overriding field-hiding inheritance.

Signed-off-by: https://github.com/Someshdiwan <[email protected]>

Author: Someshdiwan

Section16StaticFinal/src/SuperKeywrd.java renamed to Section16StaticFinal/src/SuperKeyword.java

@@ -1,39 +1,34 @@
-class Vehical
-{
+class Vehical {
     int maxSpeed = 120;
 
-    public void vroom()
-    {
+    public void vroom() {
         System.out.println("Vroom Vroom");
     }
 }
 
-class Car2 extends Vehical
-{
+class Car2 extends Vehical {
     /*int maxSpeed = 100;*/
+
     int maxSpeed = 100;
-    public void displau()
-    {
+
+    public void display() {
         System.out.println(super.maxSpeed);
     }
 
     //Super keyword on method
-    public void vroom()
-    {
+    public void vroom() {
         super.vroom();
     }
 }
 
-public class SuperKeywrd
-{
-    public static void main(String[] args)
-    {
+public class SuperKeyword {
+    public static void main(String[] args) {
         /*
         Car c = new Car();
         System.out.println(c.maxSpeed);
         */
         Car2 c = new Car2();
-        c.displau();
+        c.display();
         c.vroom();
     }
-}
+}