publicclassGFG{publicstaticvoidmain(String[]args){// 1. Declare and initialize an array of integersint[]numbers={10,20,30,40,50};// 2. Access and print each element using a loopSystem.out.println("Array elements are:");for(inti=0;i<numbers.length;i++){System.out.println(numbers[i]);}// 3. Access a single element directlySystem.out.println("First element is: "+numbers[0]);}}

Array elements are:1020304050First element is: 10

Declaring an Array

Before using an array, you must declare it by specifying the data type and the array name.

Syntax:

dataType[] arrayName;
dataType arrayName[];

Examples:

// Declares an integer array
int[] numbers;

// Declares a string array
String[] names;

// Declares a double array
double[] scores;

Initialize an Array in Java

After declaration, arrays must be initialized with values. There are several ways to do this:

1. Static Initialization

Values are assigned to the array at the time of declaration.

int[] numbers = {10, 20, 30, 40, 50};
String[] fruits = {"Apple", "Banana", "Mango"};

2. Dynamic Initialization

The array is created first with a specific size, and values are assigned later.

int[] numbers = new int[5]; // Array of size 5
numbers[0] = 10;
numbers[1] = 20;
numbers[2] = 30;
numbers[3] = 40;
numbers[4] = 50;

3. Initializing Using Loops

Ideal for larger arrays or sequential values:

int[] arr = new int[5];
for (int i = 0; i < arr.length; i++) {
arr[i] = i + 1; // Fills array with 1, 2, 3, 4, 5
}

4. Initialization Using Streams

Java 8 introduced IntStream to initialize integer arrays efficiently.