java arraylist examples
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Java ArrayList: A Comprehensive Tutorial with Examples
The `ArrayList` in Java is a resizable array implementation of the `List` interface. It's a powerful and versatile data structure that offers dynamic resizing and a wide range of methods for manipulating collections of objects. Unlike a traditional Java array which has a fixed size defined at creation, an `ArrayList` can grow or shrink as needed.
This tutorial will cover the basics of `ArrayList`, its core methods, and some advanced use cases, all illustrated with practical code examples.
*1. Understanding the Basics*
*What is an ArrayList?*
An `ArrayList` is a class within the `java.util` package. It's a dynamic array, meaning its size can change at runtime. It maintains the order of elements and allows duplicate values. It is implemented using a resizable array, which is a standard array that gets replaced with a larger one when it becomes full.
*Key Features:*
*Dynamic Size:* Automatically adjusts its capacity as elements are added or removed.
*Ordered Collection:* Elements are stored in the order they are added.
*Allows Duplicates:* Can contain multiple instances of the same object.
*Random Access:* Provides efficient access to elements using their index (like a regular array).
*Non-synchronized:* `ArrayList` is not thread-safe by default. If you need thread-safe access, consider using `Collections.synchronizedList(new ArrayList(...))` or `CopyOnWriteArrayList`.
*How it works internally (Simplified):*
Imagine a standard array. When you try to add an element and the array is full, `ArrayList` performs these steps:
1. *Creates a new array:* It creates a new array with a larger capacity (typically 1.5 times the old capacity, but this can vary by implementation).
2. *Copies elements:* It copies all the elements from the old array to the new array.
3. *Adds the new element:* The new element is added to the new array.
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