How to Find Array Length in Java

In Java, the array length is the number of elements that an array can holds. There is no predefined method to obtain the length of an array. We can find the array length in Java by using the array attribute length. We use this attribute with the array name. In this section, we will learn how to find the length or size of an array in Java.

Array length Attribute

Java provides an attribute length that determines the length of an array. Every array has an in-built length property whose value is the size of the array. Size implies the total number of elements that an array can contain. The length property can be invoked by using the dot (.) operator followed by the array name. We can find the length of int[], double[], String[], etc. For example:

In the above code snippet, arr is an array of type int that can hold 5 elements. The arrayLength is a variable that stores the length of an array. To find the length of the array, we have used array name (arr) followed by the dot operator and length attribute, respectively. It determines the size of the array.

Note that length determines the maximum number of elements that the array can contain or the capacity of the array. It does not count the elements that are inserted into the array. That is, length returns the total size of the array. For arrays whose elements are initialized at the time of its creation, length and size are the same.

If we talk about the logical size, the index of the array, then simply int arrayLength=arr.length-1, because the array index starts from 0. So, the logical or array index will always be less than the actual size by 1.

How to Find Array Length in Java

Let’s find the length of the array through an example.

ArrayLengthExample1.java

  public class ArrayLengthExample1  {   public static void main(String[] args)   {   //defining an array of type int named num  //the square bracket contain the length of an array  int[] num = new int[10];   //length is an Array attribute that determines the array length   int arrayLength=num.length;  //prints array length  System.out.println(“The length of the array is: “+ arrayLength);   }   }  

Output:

The length of the array is: 10

ArrayLengthExample2.java

  public class ArrayLengthExample2   {   public static void main(String[] args)   {   //initializing an array of type String named country   String[] country = { “India”, “Australia”, “Japan”, “USA”, “UAE”, “Canada”, “Brazil”};  //length is an Array attribute that determines the array length   int arrayLength=country.length;   //prints array length  System.out.println(“The size of the array is: ” + arrayLength);   }   }  

Output:

The size of the array is: 7

ArrayLengthExample3.java

  public class ArrayLengthExample3   {  private static void LengthOfArray(String[] array)   {  //checks array is empty or not      if (array == null)   {  //if the array is empty prints the following statement  System.out.println(“The array is empty, can’t be determined length.”);  }   else   {  //length attribute of the Array class determines the length of an array  int arrayLength = array.length;  //prints the array length  System.out.println(“The length of the array is: “+arrayLength);  }  }  public static void main(String[] args)   {  String[] fruits = { “Guava”, “Banana”, “Apple”, “Papaya”, “Melon”, “Strawberry”};  String[] alphabets = { “m”, “p”, “k”, “l”, “t” };  String[] numbers = { “12”, “25”, “63”, “84”, “90”, “11”, “54”};  //passing null value to the function  LengthOfArray(null);  //passing fruits array to the function  LengthOfArray(fruits);  //passing alphabets array to the function  LengthOfArray(alphabets);  //passing numbers array to the function  LengthOfArray(numbers);  }  }  

Output:

The array is empty, can't be determined length.  The length of the array is: 6  The length of the array is: 5  The length of the array is: 7

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