Say Goodbye to Switch! Use Enum and Lambda for Cleaner Code (Java Example)

🚀 Introduction

Tired of long switch statements? Let’s replace them with Enums + Lambda expressions for cleaner and scalable code! No theory—just code.

Say Goodbye to Switch! Use Enum and Lambda for Cleaner Code (Java Example)

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• Java — All things Java-related.
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📝 The Problem: Long Switch-Case for Actions

public class PaymentService {
    public void processPayment(String paymentType) {
        switch (paymentType) {
            case "CREDIT":
                System.out.println("Processing Credit Card Payment...");
                break;
            case "DEBIT":
                System.out.println("Processing Debit Card Payment...");
                break;
            case "PAYPAL":
                System.out.println("Processing PayPal Payment...");
                break;
            default:
                System.out.println("Invalid Payment Type");
        }
    }
}

✔ Works, but not scalable. ❌ Adding a new payment type requires modifying the method.

✅ Solution: Use Enum with Lambda

import java.util.function.Consumer;

enum PaymentType {
    CREDIT(payment -> System.out.println("Processing Credit Card Payment...")),
    DEBIT(payment -> System.out.println("Processing Debit Card Payment...")),
    PAYPAL(payment -> System.out.println("Processing PayPal Payment...")),
    UNKNOWN(payment -> System.out.println("Invalid Payment Type"));

    private final Consumer<String> action;

    PaymentType(Consumer<String> action) {
        this.action = action;
    }

    public void process() {
        action.accept(this.name());
    }

    public static PaymentType from(String type) {
        try {
            return PaymentType.valueOf(type);
        } catch (IllegalArgumentException e) {
            return UNKNOWN;
        }
    }
}

public class PaymentService {
    public void processPayment(String paymentType) {
        PaymentType.from(paymentType).process();
    }
}

✔ More Maintainable — Just add a new enum constant. ✔ Encapsulation — Business logic stays inside the Enum. ✔ No More Long Switch-Case!

🔥 Use Enums + Lambdas for clean and maintainable code! 🚀

Story List Categories:

• ***About Me & [List of Stories](https://medium.com/@saannjaay/lists)***
• 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