Unit Plan - Arrays and ArrayLists

Unit Title: Arrays and ArrayLists

Unit Overview:

This unit will explore the use of arrays and ArrayLists in Java, essential components for managing and manipulating collections of data in AP Computer Science A. Students will learn how to declare, initialize, and manipulate arrays and ArrayLists, iterate through them, and apply searching and sorting algorithms. By the end of this unit, students will understand the differences between arrays and ArrayLists, and be able to choose the appropriate data structure based on the problem requirements.

Unit Duration: 2 weeks

Unit Objectives:

1. Understand the concept of arrays and their role in storing data.
2. Learn to declare, initialize, and manipulate arrays.
3. Grasp the basics of ArrayLists and their advantages over arrays.
4. Apply array and ArrayList concepts to solve problems and write efficient code.
5. Learn to search and sort arrays and ArrayLists using various algorithms.

Unit Outline:

Week 1: Arrays

• Lesson 1: Introduction to Arrays

  • Define what an array is and explain its role in programming.
  • Declare and initialize arrays, and access array elements.

• Lesson 2: Array Manipulation

  • Manipulate arrays by adding, removing, and updating elements.
  • Discuss the limitations of arrays in terms of size and mutability.

• Lesson 3: Iterating through Arrays

  • Iterate through arrays using for loops, while loops, and enhanced for loops.
  • Practice using array methods like length to control loops.

Week 2: ArrayLists

• Lesson 4: Introduction to ArrayLists

  • Define what an ArrayList is and explain its advantages over arrays.
  • Create and initialize ArrayLists, and access ArrayList elements.

• Lesson 5: ArrayList Manipulation

  • Manipulate ArrayLists by adding, removing, and updating elements.
  • Discuss the benefits of ArrayLists, such as dynamic sizing and built-in methods.

• Lesson 6: Iterating through ArrayLists

  • Iterate through ArrayLists using for loops, while loops, and enhanced for loops.
  • Practice using ArrayList methods like size() to control loops.

• Lesson 7: Searching and Sorting Arrays and ArrayLists

  • Learn and implement searching algorithms like linear search for arrays and ArrayLists.
  • Learn and implement sorting algorithms like Arrays.sort() and Collections.sort() for arrays and ArrayLists.

Assessments:

• Formative Assessments:

  • Code reviews and peer assessments to encourage collaboration and feedback.

• Summative Assessment:

  • A final project where students apply array and ArrayList concepts to develop a program that manipulates and processes data collections.

Resources:

• College Board's AP Computer Science A Course and Exam Description for guidance and alignment.
• Java textbooks or online tutorials for reference and additional practice.
• Practice problems and exercises from various sources to reinforce learning.

Differentiation:

• Provide additional challenges for advanced students, such as implementing custom sorting algorithms or optimizing search algorithms.
• Offer extra support and resources for students who need it, such as additional practice problems, one-on-one assistance, or small group sessions.

Reflection and Adjustment:

• Encourage students to reflect on their learning and identify areas for improvement.
• Adjust the pace and content of the unit based on student feedback and performance on assessments.