AlgoDaily - Collections Framework

Home > Backend Devlopement Learning > Backend Devlopement Learning > Collections Framework

The List interface is a fundamental part of the Java Collections Framework and provides an ordered collection of elements. It allows elements to be inserted, accessed, and removed based on their position in the list.

As a senior engineer with experience in Java and Spring Boot, you might be familiar with the concept of arrays. The List interface is similar to arrays, but with added flexibility and functionality.

One of the most commonly used implementations of the List interface is the ArrayList class. The ArrayList class provides a resizable array-like structure that can dynamically grow or shrink based on the number of elements it contains.

Let's take a look at an example of using the List interface with the ArrayList class:

TEXT/X-JAVA

1import java.util.ArrayList;
2import java.util.List;
3
4public class Main {
5    public static void main(String[] args) {
6        // Creating an ArrayList
7        List<String> fruits = new ArrayList<>();
8
9        // Adding elements to the ArrayList
10        fruits.add("Apple");
11        fruits.add("Banana");
12        fruits.add("Orange");
13
14        // Accessing elements in the ArrayList
15        String firstFruit = fruits.get(0);
16        String lastFruit = fruits.get(fruits.size() - 1);
17
18        // Removing an element from the ArrayList
19        fruits.remove(1);
20
21        // Printing the elements
22        System.out.println("First Fruit: " + firstFruit);
23        System.out.println("Last Fruit: " + lastFruit);
24        System.out.println("Updated ArrayList: " + fruits);
25    }
26}

xxxxxxxxxx
 
import java.util.ArrayList;
import java.util.List;
​
public class Main {
    public static void main(String[] args) {
        // Creating an ArrayList
        List<String> fruits = new ArrayList<>();
​
        // Adding elements to the ArrayList
        fruits.add("Apple");
        fruits.add("Banana");
        fruits.add("Orange");
​
        // Accessing elements in the ArrayList
        String firstFruit = fruits.get(0);
        String lastFruit = fruits.get(fruits.size() - 1);
​
        // Removing an element from the ArrayList
        fruits.remove(1);
​
        // Printing the elements
        System.out.println("First Fruit: " + firstFruit);
        System.out.println("Last Fruit: " + lastFruit);
        System.out.println("Updated ArrayList: " + fruits);
    }
}

Programming Categories

Popular Lessons