Arrays

In the world of programming, arrays are one of the most fundamental data structures. They provide a way to store and manipulate a fixed-size sequence of elements of the same type.

As a senior engineer with experience in Java, Spring Boot, and MySQL, you have likely encountered arrays in your coding journey. An array can be thought of as a collection of variables of the same type, where each variable, referred to as an element, is identified by its index.

Arrays in Java are zero-indexed, meaning the first element in the array has an index of 0, the second element has an index of 1, and so on.

1// Creating and initializing an array
2int[] numbers = {1, 2, 3, 4, 5};
3
4// Accessing elements of an array
5System.out.println("The first element is: " + numbers[0]);
6System.out.println("The last element is: " + numbers[numbers.length - 1]);
7
8// Updating an element of an array
9numbers[2] = 6;
10System.out.println("The updated element at index 2 is: " + numbers[2]);
11
12// Iterating over an array
13for (int i = 0; i < numbers.length; i++) {
14  System.out.println("Element at index " + i + ": " + numbers[i]);
15}

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class Main {

  public static void main(String[] args) {

    // replace with your Java logic here

    int[] numbers = {1, 2, 3, 4, 5};

​

    // Accessing elements of an array

    System.out.println("The first element is: " + numbers[0]);

    System.out.println("The last element is: " + numbers[numbers.length - 1]);

​

    // Updating an element of an array

    numbers[2] = 6;

    System.out.println("The updated element at index 2 is: " + numbers[2]);

​

    // Iterating over an array

    for (int i = 0; i < numbers.length; i++) {

      System.out.println("Element at index " + i + ": " + numbers[i]);

    }

  }

}