Java get size of array

How to Find Array Length in Java with Examples

In this blog post, we are going to learn an important topic pertaining to Java i.e Array length.

Java is a high-end programming language by accompanying robustness, security, and greater performance.

How to Find Array Length in Java?

An array length in Java represents a series of elements that an array could really hold. There really is no predetermined method for determining an object’s length. In Java, developers can discover its array length with the help of array attribute length. One such attribute is used in conjunction with array names. To gain deeper insights into this programming language, java training is compulsory. Therefore in this blog post, we’ll look at how to calculate the size as well as the length of the arrays in Java.

Length Attribute in Java

The length attribute throughout Java represents the size of the array. Each array has a length property, for which the value seems to be the array’s size. The overall quantity of elements that the array can encompass is denoted by its size. In order to access the length property, use dot (.) operator which is accompanied by an array name. Also we can determine the length of int[ ]double[] and String[]. As an example:

In the above sample code, arr represents the array type and it is the int with a capacity of 5 elements. In simple terms array Length perhaps is the variable that keeps track of the length of an array. An array name (arr) is accompanied by a dot operator as well as the length attribute to determine the length of the array. It defines the array’s size.

Array length = Array’s last Index+1

It is important to note that such length of the array defines the upper limit number of the elements that can hold or its capacity. This does not include the elements which are added to the array. It is, length comes back the array’s total size. The length and size of arrays for whom the elements have been configured just at the time of their establishment were the same.

However, if we’re talking well about an array’s logical size or index, after which merely int arrayLength=arr.length-1, since an array index begins at 0. As a result, the logical, as well as an array index, was always one less than the real size.

In the above picture, 0 is the first index and the array length will be 10.

Now we will explore how to fetch the length of an array using an example.

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Java get size of array

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Java get size of array

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How to Find Size or Length of Array in Java

How to Find Size or Length of Array in Java | Array Programs in Java – 1 | In this post, we will discuss how to find the size or length of an array in Java? How to find the size or length of the multidimensional array in Java?

The length is an in-built property of the array variable, which stores the information about the number of elements in the array.

Whenever we initialize an array then by default length property is assigned to the array and we can access them through arrayVariable.length

Java program to display size or length of an array in Java

public class ArrayLength < public static void main(String[] args) < // declare and initialize an array int arr[] = ; // display array length System.out.print("The length of the given array = "); System.out.println(arr.length); > >

The length of the given array = 5

Using the length property we can iterate through the array,

class TestArray< public static void main(String[] args) < // defining array int[] a = ; // display size of array System.out.println("Size = "+ a.length); // display array using length property System.out.println("Array elements:"); for(int i=0; i < a.length; i++)< System.out.print(a[i]+"\t"); >> >

Size = 5
Array elements:
10 20 30 40 50

How to Find the length of Multidimensional Array in Java

Java Multidimensional arrays have multiple length properties, each for every dimension basis. For example, if we have a two-dimensional array arr then we can find parent length using arr.length, and child length using arr[index].length

public class ArrayLength < public static void main(String[] args) < // declare and initialize an array int arr[][] = ,,>; // display array length System.out.print("The length of the given array = "); System.out.println(arr.length); System.out.println("arr[0] length = " + arr[0].length); System.out.println("arr[1] length = " + arr[0].length); System.out.println("arr[2] length = " + arr[0].length); > >

The length of the given array = 3
arr[0] length = 2
arr[1] length = 2
arr[2] length = 2

It can be also displayed as:-

// display array length System.out.print("The length of the given array = "); System.out.println(arr.length); for(int i=0; i

The above length property can be used to manipulate the multi-dimensional array-like to display the multi-dimensional array.

// display 2D array using for loop for(int i=0; i >

Java program to demonstrate these above points,

class TestArray< public static void main(String[] args) < // 2d array int[][] a = ,,>; // display size of array System.out.println("2D array size = "+ a.length); System.out.println("First row size = "+ a[0].length); System.out.println("Second row size = "+ a[1].length); // display array using length property System.out.println("Array elements:"); for(int i=0; i < a.length; i++)< for (int j=0; j < a[i].length; j++) < System.out.print(a[i][j]+"\t"); >System.out.println(); > > >

2D array size = 3
First row size = 2
Second row size = 2
Array elements:
10 20
30 40
50 60

Size of Jagged Array in Java

Jagged Array in Java:- A multi-dimensional array with different sizes child array is called a Jagged array. It creates a table with different sizes of columns in a row.

class TestArray< public static void main(String[] args) < int[][] a = ,,,>; // display size of array System.out.println("Array size = "+ a.length); System.out.println("First row size = "+ a[0].length); System.out.println("Second row size = "+ a[1].length); // display array using length property System.out.println("Array elements:"); for(int i=0; i < a.length; i++)< for (int j=0; j < a[i].length; j++) < System.out.print(a[i][j] + "\t"); >System.out.println(); > > >

Array size = 4
First row size = 2
Second row size = 1
Array elements:
10 20
30
50 60 70
80 90

Size of Three Dimensional Java Array

Three dimensional (3D) array contains three properties:- arr.length, arr[index].length, and arr[index-1][index-2].length. Below program demonstrate it,

public class ArrayLength < public static void main(String[] args) < // declare and initialize an array int[][][] arr = < ,,>, ,,> >; // display array length System.out.print("The length of the given array = "); System.out.println(arr.length); System.out.println("arr[0] length = " + arr[0].length); System.out.println("arr[0][0] length = " + arr[0][0].length); System.out.println("arr[0][1] length = " + arr[0][1].length); System.out.println("arr[0][2] length = " + arr[0][2].length); > >

The length of the given array = 2
arr[0] length = 3
arr[0][0] length = 2
arr[0][1] length = 2
arr[0][2] length = 2

We can use these length properties to display the three-dimensional array,

// displaying three dimension array in Java // using for loop and length property for(int i=0; i < arr.length; i++)< for(int j=0; j < arr[i].length; j++)< for(int k=0; k < arr[i][j].length; k++)< System.out.print( arr[i][j][k] + "\t"); >> >

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