Methods and Reuse

Explanation

1. Purpose

This program demonstrates how to write a reusable custom method that takes input values, performs a calculation (calculating a price with tax), and returns the result to be displayed.

2. Key Concepts

• Static Methods: Methods that belong to the class itself and can be called directly from main without creating an object instance.
• Parameters and Arguments: Defining inputs in the method header (price, taxRate) and passing concrete values (12.50, 0.08) when calling it.
• Return Value: Using the return keyword to send the calculated double value back to the caller.
• Formatted Printing (printf): Using %.2f to round and format a floating-point number to two decimal places.

3. Code Walkthrough

• Lines 2–4 (finalPrice method):
  Declares a static method that accepts two double parameters. It calculates the tax (price * taxRate), adds it to the original price, and returns the total.
• Line 7 (Method Call):
  Inside main, the program calls finalPrice(12.50, 0.08). The method runs, returns 13.50, and stores that value in the variable total.
• Line 8 (Display Output):
  System.out.printf formats the total variable to 2 decimal places (%.2f) and moves to a new line (%n).

4. Output

Total: 13.50