Learn how to write better Java methods that are short, clear, and powerful. Discover practical tips with real-world examples to improve your Java coding skills.

Ramesh Fadatare

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Apr 28, 2025

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🧾 Introduction

Writing Java methods is easy —
but writing good methods that are short, clear, and powerful is an art.

Clean methods:

✅ Make your code easier to read
✅ Make your code easier to test
✅ Make your entire project easier to maintain

In this guide, you’ll learn how to write better Java methods with real-world examples and practical tips you can apply immediately.

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✅ 1. Keep Methods Short (Prefer Under 15 Lines)

Problem:
Long methods are hard to understand and harder to debug.

Solution:
✅ Focus each method on a single, small task.
✅ If a method is growing too large, split it into smaller private helper methods.

❌ Before (Messy and Long Checkout Code)

public void checkoutOrder(Order order) {
    if (order == null) {
        throw new IllegalArgumentException("Order cannot be null");
    }
    if (order.getItems() == null || order.getItems().isEmpty()) {
        throw new IllegalArgumentException("Order must have at least one item");
    }
    if (order.getTotalAmount() <= 0) {
        throw new IllegalArgumentException("Order total must be greater than zero");
    }

    paymentService.processPayment(order.getPaymentDetails());

    inventoryService.updateStock(order.getItems());

    shippingService.prepareShipment(order)…