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The ArrayList class in Java is a resizable array that is part of the java.util package. Unlike a built-in array, the size of an ArrayList can be modified dynamically, allowing elements to be added or removed as needed. This makes ArrayList a flexible and powerful tool for managing collections of data.
Creating an ArrayList
To create an ArrayList, you need to import the ArrayList class from the java.util package and then instantiate it. Here is an example of creating an ArrayList to store strings:
import java.util.ArrayList;public class Main {public static void main(String[] args) {ArrayList<String> cars = new ArrayList<String>();}}Cóipeáilte!✕CóipeáilAdding Elements
You can add elements to an ArrayList using the add() method. You can also specify the position where the element should be added by providing an index:
cars.add("Volvo");cars.add("BMW");cars.add("Ford");cars.add(0, "Mazda"); // Insert element at the beginningCóipeáilte!✕CóipeáilAccessing Elements
Java ArrayList - W3Schools
An ArrayList keeps elements in the same order you add them, so the first item you add will be at index 0, the next at index 1, and so on.
Sampla de chód
// Create an ArrayList object called cars that will store stringsimport java.util.ArrayList; // import the ArrayList classArrayList<String> cars = new ArrayList<String>(); // Create an ArrayList objectArrayList in Java - GeeksforGeeks
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