feat: Add Bonus and Programmer classes to demonstrate inheritance in salary calculation

WHAT the code does:
Defines Bonus with an int bonus = 10000.
Defines Programmer extending Bonus with:
- basicsal = 50000
- totsal as total salary
- salary(): computes totsal = basicsal + bonus and prints it.
Defines InheritBonus with main():
- Creates Programmer object
- Calls salary() to print combined salary (60000).

WHY this matters:
Demonstrates **inheritance** in Java: Programmer inherits the bonus field from Bonus.
Shows how subclass fields (basicsal) and superclass fields (bonus) can be combined for new behavior.
Provides a simple example of code reuse through inheritance in a business domain context (salary calculation).

HOW it works:
Programmer inherits bonus = 10000 from Bonus.
basicsal = 50000 is defined in Programmer.
salary() adds both → totsal = 60000.
Printed output: 60000.

Tips and gotchas:
Fields are package-private (default access). Best practice is to mark them private and provide getters/setters for encapsulation.
Class names should follow Java conventions: Bonus and Programmer are correct, but InheritBonus is more idiomatic as BonusDemo or SalaryTest.
Business logic is overly simplified; real salary systems would include multiple allowances, deductions, and validations.
Instead of directly accessing superclass fields, consider calling methods (e.g., getBonus()) for safer encapsulation.

Use-cases:
Educational demonstration of inheritance in Java.
Simple domain model for teaching salary calculation.
Foundation for introducing more complex HR or payroll modeling with polymorphism and abstraction.

Short key: class-bonus programmer inheritance salary.

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

Author: Someshdiwan

Section12Inheritance/src/InheritBonus.java

@@ -1,24 +1,20 @@
-class Bonus
-{
+class Bonus {
     int bonus = 10000;
 }
 
-class Programmer extends Bonus
-{
+class Programmer extends Bonus {
     int basicsal = 50000;
     int totsal;
-    void salary()
-    {
+
+    void salary() {
         totsal = basicsal + bonus;
         System.out.println(totsal);
     }
 }
 
-class InheritBonus
-{
-    public static void main(String[] args)
-    {
+class InheritBonus {
+    public static void main(String[] args) {
         Programmer p = new Programmer();
         p.salary();
     }
-}
+}