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Modern Java: From Fundamentals to Advanced Architecture

Solution: The Coffee Shop Receipt

Explore how to define variables of different types, use arithmetic operators for calculations, and apply string concatenation in Java by working through a coffee shop receipt example that computes costs and taxes.

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Java 25
public class CoffeeShopReceipt {
    public static void main(String[] args) {
        // 1. Define order details
        double lattePrice = 5.50;
        int quantity = 3;
        double taxRate = 0.08; // 8% tax
        // 2. Perform calculations
        double subtotal = lattePrice * quantity;
        double taxAmount = subtotal * taxRate;
        double grandTotal = subtotal + taxAmount;
        // 3. Print the receipt
        System.out.println("Receipt Summary:");
        System.out.println("Subtotal: " + subtotal);
        System.out.println("Tax: " + taxAmount);
        System.out.println("Total: " + grandTotal);
    }
}
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