ArrayList
The ArrayList class in Java is a resizable array implementation of the List interface. It provides various methods that allow you to add, remove, and access elements in the ArrayList.
To use the ArrayList class, you need to import the java.util.ArrayList package.
Here's an example that demonstrates the usage of the ArrayList class:
TEXT/X-JAVA
1import java.util.ArrayList;
2
3public class Main {
4
5 public static void main(String[] args) {
6 // Create an ArrayList
7 ArrayList<String> arrayList = new ArrayList<>();
8
9 // Add elements to the ArrayList
10 arrayList.add("Element 1");
11 arrayList.add("Element 2");
12 arrayList.add("Element 3");
13
14 // Access elements in the ArrayList
15 String element = arrayList.get(1);
16 System.out.println("Element at index 1: " + element);
17
18 // Update an element
19 arrayList.set(0, "Updated Element");
20
21 // Remove an element
22 arrayList.remove(2);
23
24 // Check if an element exists
25 boolean exists = arrayList.contains("Element 2");
26 System.out.println("Element 2 exists: " + exists);
27
28 // Get the size of the ArrayList
29 int size = arrayList.size();
30 System.out.println("Size of the ArrayList: " + size);
31 }
32
33}xxxxxxxxxx33
}import java.util.ArrayList;public class Main { public static void main(String[] args) { // Create an ArrayList ArrayList<String> arrayList = new ArrayList<>(); // Add elements to the ArrayList arrayList.add("Element 1"); arrayList.add("Element 2"); arrayList.add("Element 3"); // Access elements in the ArrayList String element = arrayList.get(1); System.out.println("Element at index 1: " + element); // Update an element arrayList.set(0, "Updated Element"); // Remove an element arrayList.remove(2); // Check if an element exists boolean exists = arrayList.contains("Element 2"); System.out.println("Element 2 exists: " + exists); // Get the size of the ArrayList int size = arrayList.size();OUTPUT
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