Popcorn Hack 1

// Popcorn Hack #1: Complete this code

import java.util.ArrayList;

public class PopcornHack1 {
    public static void main(String[] args) {
        // TODO: Use Math.pow() to calculate 3^4
        Math.pow(3,4);
        
        // TODO: Use Math.sqrt() to find square root of 64
        Math.sqrt(64);
        
        // TODO: Create ArrayList of Strings
        ArrayList<String> colors = new ArrayList<String>();
        
        // TODO: Add 3 colors ("red", "blue", "green")
        colors.add("red");
        colors.add("blue");
        colors.add("green");
        
        // TODO: Print the size
        System.out.println(colors.size());
        
    }
}

PopcornHack1.main(null)

3

Popcorn Hack 2

// Popcorn Hack #2: Complete the Book class

public class Book {
    // TODO: Add 3 attributes (title, author, pages)
    String title;
    String author;
    int pages;

    // TODO: Add constructor
    public Book(String title, String author, int pages) {
        this.title = title;
        this.author = author;
        this.pages = pages;
    }
    
    // TODO: Add displayInfo() method
    public void displayInfo() {
         System.out.printf("The book is %s and it was written by %s. The book is %d pages long.", title, author, pages);
    }
}

// TODO: Create a Book object and test all methods
Book myBook = new Book("The Return of the King", "J. R. R.", 416);

myBook.displayInfo();

The book is The Return of the King and it was written by J. R. R.. The book is 416 pages long.

Homework Hack: Phone Class

import java.util.ArrayList;

public class Phone {
    String brand;
    String model;
    int batteryLevel = 100;
    ArrayList<String> contacts = new ArrayList<String>();

    public Phone(String brand, String model) {
        this.brand = brand;
        this.model = model;
        this.batteryLevel = 100;
        this.contacts = contacts;
    }

    public void displayInfo() {
        System.out.printf("The brand of the phone is %s. The model of the phone is %s. The battery of the phone is %d\n", brand, model, batteryLevel);
    }

    public void addContact(String name) {
        contacts.add(name);
    }

    public void showContacts() {
        System.out.println("Contacts: " + contacts);
    }
    
    public void usePhone (int minutes) {
        batteryLevel -= minutes;
    }
}

public class PhoneTest {
    public static void main(String[] args) {
        // Set up Samsung Phone
        Phone samsungPhone = new Phone("Samsung", "25");

        samsungPhone.addContact("Bob");
        samsungPhone.addContact("Billy");
        samsungPhone.addContact("Boe");

        samsungPhone.usePhone(20);

        // Set up Apple Phone
        Phone applePhone = new Phone("iPhone", "17");

        applePhone.addContact("Jill");
        applePhone.addContact("Jane");
        applePhone.addContact("Jocelyn");

        applePhone.usePhone(50);

        // Display info of created phones
        samsungPhone.displayInfo();
        samsungPhone.showContacts();

        applePhone.displayInfo();
        applePhone.showContacts();

    }
}

PhoneTest.main(null);

The brand of the phone is Samsung. The model of the phone is 25. The battery of the phone is 80
Contacts: [Bob, Billy, Boe]
The brand of the phone is iPhone. The model of the phone is 17. The battery of the phone is 50
Contacts: [Jill, Jane, Jocelyn]