CellPhone Service 3

Overloaded constructors and overloaded methods — multiple ways to create and use objects

Workbook 2a, p.54 — Exercise 3

What You're Building

Add an overloaded constructor to your CellPhone class that accepts all five properties as parameters. Create a third phone using this new constructor — no setters needed. Display all three phones and have them dial each other. Optionally, add an overloaded version of dial() that takes a CellPhone object instead of a phone number string.

Example Run

Run 1

Phone 1: Serial Number: 12345 Model: iPhone 15 Carrier: Verizon Phone Number: 555-123-4567 Owner: Dana Phone 2: Serial Number: 98765 Model: Galaxy S24 Carrier: T-Mobile Phone Number: 855-555-2222 Owner: Marcus Phone 3: Serial Number: 55555 Model: Pixel 9 Carrier: AT&T Phone Number: 333-444-5555 Owner: Lisa Dana's phone is calling 855-555-2222 Marcus's phone is calling 333-444-5555 Lisa's phone is calling 555-123-4567

Run 2 — With Overloaded dial(CellPhone)

Dana's phone is calling Marcus (855-555-2222) Marcus's phone is calling Lisa (333-444-5555) Lisa's phone is calling Dana (555-123-4567)

Key detail: Phone 3 is created using the overloaded constructor — all values are passed in at creation time, so you don't need to call setters afterward.

Concepts You'll Use

This exercise reinforces these concepts from Week 2:

Constructor Overloading Method Overloading

Flow Diagram

Step 1 Add 5-param constructor All fields as parameters

→

Step 2 Create 3rd phone Using new constructor

→

Step 3 Display all 3 phones Using static display()

↓

Step 4 Dial between phones Each calls another

→

Optional Overloaded dial() Takes CellPhone instead of String

Your CellPhone class now has two constructors. Java knows which one to use based on how many arguments you pass.