Java Lesson 7 – ArrayList Explained (Dynamic Lists, Adding/Removing, Looping)
In Lesson 7 of the Java Beginner series, we introduce the ArrayList — a flexible, dynamic data structure that is used in most real Java applications. Unlike arrays, an ArrayList can grow and shrink automatically, making it ideal for lists, menus, inventories, user data, and more.
Through clear examples, we explore how to add elements, remove values, search for items, loop through the list, and avoid common mistakes.
What you will learn:
• What an ArrayList is and why it solves the limitations of arrays
• How to import and create ArrayLists
• Adding, accessing, modifying, and removing elements
• The difference between removing by index and by value
• Looping through ArrayLists (standard and enhanced for-loop)
• Checking size, searching with contains() and indexOf()
• Clearing the list
• A practical mini-example (shopping cart)
• Common errors like index-out-of-bounds and type misuse
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