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Java Active Learning WorkBook: Scaffolded programming activities beyond the basics.

Celine Latulipe, Devon Blewett, Lara De Leon

Section 6.2 Starter Level

Subsection 6.2.1 Overview

The Java program CourseNumbersArray manages a list of course numbers that a student is registered in. It performs the following tasks:
  1. Initializes an integer array, registeredCourses, with a set of course numbers: 1010, 1020, 2080, 2140, 2150, 2160
  2. To add a new course, it copies the elements from registeredCourses into a new, larger array, updatedCourses, and adds the course to this new array
  3. Prints the contents of updatedCourses, the array that contains the newly-added course
  4. Checks if updatedCourses contains a specific course number
  public class CourseNumbersArray {
    public static void main(String[] args) {

        int[] registeredCourses = {1010, 1020, 2080, 2140, 2150, 2160};

        System.out.print("Originally registered for: ");
        for(int course : registeredCourses){
            System.out.print(course + ", ");
        }

        int[] updatedCourses = new int [registeredCourses.length + 1];
        System.arraycopy(registeredCourses, 0, updatedCourses, 0, registeredCourses.length);
        updatedCourses[registeredCourses.length] = 2280;

        System.out.print("\nUpdated courses: ");
        for(int course : updatedCourses){
            System.out.print(course + ", ");
        }

        int courseCode = 2140;
        boolean found = false;
        for(int course : updatedCourses){
            if(course == courseCode){
                found = true;
            }
        }
        if(found){
            System.out.println("\nYou are registered for " + courseCode);
        }
        else{
            System.out.println("You are not registered for " + courseCode);
        }
    }    
  }

Subsection 6.2.2 Instructions

Convert the existing program that uses an int[] to use an ArrayList of Integer instead.
Hint.
.contains() should simplify the search for a specific course.
The expected output is:
Originally registered for: 1010, 1020, 2080, 2140, 2150, 2160, 
Updated courses: 1010, 1020, 2080, 2140, 2150, 2160, 2280, 
You are registered for 2140
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