Careeroza

Real World Example

Printing a Shopping Bill

Billing software in supermarkets (DMart, Reliance Smart) prints neat receipts with aligned columns. printf widths make that easy.

Example

public class Main {
    public static void main(String[] args) {
        System.out.println("========= SUPER MART =========");
        System.out.printf("%-14s %4s %10s%n", "Item", "Qty", "Amount");
        System.out.println("------------------------------");
        System.out.printf("%-14s %4d %10.2f%n", "Basmati Rice", 2, 2 * 120.0);
        System.out.printf("%-14s %4d %10.2f%n", "Milk 1L", 3, 3 * 54.0);
        System.out.printf("%-14s %4d %10.2f%n", "Biscuits", 5, 5 * 10.0);
        System.out.println("------------------------------");
        double total = 2 * 120.0 + 3 * 54.0 + 5 * 10.0;
        System.out.printf("%-19s %10.2f%n", "TOTAL", total);
        System.out.println("   Thank you! Visit again.");
    }
}

Output

========= SUPER MART =========
Item            Qty     Amount
------------------------------
Basmati Rice      2     240.00
Milk 1L           3     162.00
Biscuits          5      50.00
------------------------------
TOTAL                   452.00
   Thank you! Visit again.