Java Array

An array in Java is a container object that holds a fixed number of elements of the same type. It is a data structure used to store multiple values in a single variable, making it easier to manage collections of data.

Types of Arrays

One-Dimensional Array: A list of elements in a single row.
Multi-Dimensional Array: Arrays with multiple rows and columns (e.g., 2D arrays).

One-Dimensional Array:

Syntax:

dataType[] arrayName = newdataType[size];

Example

// Declare and initialize an array

int[] numbers = new int[5]; // Array with 5 elements

// Assign values to the array

numbers[0] = 10;

numbers[1] = 20;

numbers[2] = 30;

numbers[3] = 40;

numbers[4] = 50;

// Access and print elements

System.out.println("First element: " + numbers[0]);

System.out.println("Third element: " + numbers[2]);

// Loop through the array

System.out.println("Array elements:");

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

System.out.println(numbers[i]);

}

Try it yourself

Multi-Dimensional Array:

Syntax:

dataType[][] arrayName = new dataType[rows][columns];

Example

// Declare and initialize a 2D array

int[][] matrix = {

{1, 2, 3},

{4, 5, 6},

{7, 8, 9}

};

// Access and print elements

System.out.println("Element at (0, 1): " + matrix[0][1]); // 2

System.out.println("Element at (2, 2): " + matrix[2][2]); // 9

// Loop through the 2D array

System.out.println("Matrix:");

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

for (int j = 0; j < matrix[i].length; j++) {

System.out.print(matrix[i][j] + " ");

}

System.out.println();

}

Try it yourself

Enhanced For Loop (For-Each Loop):

The for-each loop is used to iterate over arrays or collections without using an index. It's simpler and avoids potential errors with index handling.

Example

int[] numbers = {10, 20, 30, 40};

for (int num : numbers) {

System.out.println(num);

}

Try it yourself

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