Java Arrays

Arrays are used to store multiple values in a single variable, instead of declaring separate variables for each value.

To declare an array, define the variable type with square brackets

Example

 
String[ ] phones; 
String[] phones = {"Vivo", "Samsung", "Apple", "Nokia"}; 
                  
 Output: Vivo

-Array in Java is index-based, the first element of the array is stored at the 0th index, 2nd element is stored on 1st index and so on.

-We can store only a fixed set of elements in a Java array.

Types of Array in java:-

Single Dimensional Array
Multidimensional Array

Single Dimensional Array:-

-A single dimensional array in Java is a collection of elements of the same type that are stored in a sequential manner.

Here are some of the things you can do with single dimensional arrays:

Store data.
Access data.
Sort data.
Search data.
Loop through data.
Manipulate data.

Example

 String[] cars = {"Volvo", "BMW", "Ford", "Mazda"}; 
 cars[0] = "Opel"; 
System.out.println(cars[0]); 
 // Now outputs Opel instead of Volvo

Multidimensional Array:-

In such case, data is stored in row and column based index (also known as matrix form).

Example

                 int[ ][ ] array = new int[3][4];

This code declares a multidimensional array of 3 rows and 4 columns. Each element in the array is an integer.

Example

public class Main { 
 public static void main(String[] args) { 
 int[][] myNumbers = { {1, 2, 3, 4}, {5, 6, 7} }; 
 System.out.println(myNumbers[1][2]); 
 } 
 } 
 Output: 7

Java Array Using for-each loop Java Array Using for-each loop

The Java for-each loop prints the array elements one by one. It holds an array element in a variable, then executes the body of the loop.

Example

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

 for (int number : numbers) {
System.out.println(number);
}
 Output:
    1
    2
    3
    4
    5