Refactor Switch Statements with Polymorphism (Best OOP Approach!)

✅ Why Use Polymorphism Over Switch-Case?

1. Extensible & Open-Closed Principle (OCP) — New behavior can be added without modifying existing code.
2. Encapsulation — Each behavior is self-contained within its class.
3. No Risk of break Omissions – Eliminates common switch-case pitfalls.
4. Readable & Maintainable — Code is more structured and easier to test.

Refactor Switch Statements with Polymorphism (Best OOP Approach!)

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📝 The Problem: Hardcoded Conditions for Different Employees

public class SalaryService {
    public double calculateSalary(String employeeType, double baseSalary) {
        switch (employeeType) {
            case "FULL_TIME":
                return baseSalary * 1.2;
            case "PART_TIME":
                return baseSalary * 1.1;
            case "INTERN":
                return baseSalary * 0.8;
            default:
                return baseSalary;
        }
    }
}

✔ Works, but not extensible.
❌ Violates Open/Closed Principle (OCP).

✅ Solution: Use Polymorphism (Best Object-Oriented Approach!)

interface Employee {
    double calculateSalary(double baseSalary);
}

class FullTimeEmployee implements Employee {
    public double calculateSalary(double baseSalary) {
        return baseSalary * 1.2;
    }
}

class PartTimeEmployee implements Employee {
    public double calculateSalary(double baseSalary) {
        return baseSalary * 1.1;
    }
}

class Intern implements Employee {
    public double calculateSalary(double baseSalary) {
        return baseSalary * 0.8;
    }
}

public class SalaryService {
    public double calculateSalary(Employee employee, double baseSalary) {
        return employee.calculateSalary(baseSalary);
    }
}

✔ No Hardcoded Conditions — Each employee type has its own class.
✔ More Maintainable — Adding new employee types doesn’t modify existing code.
✔ OOP Best Practice — Leverages Polymorphism instead of conditionals.

🔥 Use Polymorphism to eliminate switch-case and write scalable OOP code! 🚀

Story List Categories:

• About Me & List of Stories
• Java — All things Java-related.
• Java Interview Playbook: Your Go-To Reading List — For interview preparation.
• JAVA-8 — Dedicated to Java 8 topics.
• Spring Boot & Spring — Focused on Spring and Spring Boot.
• Microservices Topics List — Covering various microservices to