How to determine the length or size of an array in Java?

In Java, one of the convenient ways to determine the length or size of an array is by using its length property. It counts the number of stored elements in an array and returns the count . Finding the length of an array is one of the common yet crucial operation as it is used to find the number of elements of an array, append new elements into it and retrieve stored items. This article aims to explain the various ways to get the length or size of an array.

Java Program to determine the length or size of an Array

The following example will help us understand how to find the size of an array.

The Chinese translation of

Example 1

is:

Example 1

The following example illustrates the use of length property with an array of type integer.

import java.util.*;
public class Example1 {
   public static void main(String[] args) {
      int[] aray = new int[5]; // declaring array of size 5
      // initializing the array
      aray[0] = 11;
      aray[1] = 21;
      aray[2] = 13;
      aray[3] = 23;
      aray[4] = 30;
      // printing the elements of array
	  System.out.println("Elements of the given array: ");
	  for(int elm : aray) {
	     System.out.print(elm + " "); 
	  }
	  System.out.println();
	  // printing the length of array
      System.out.println("Length of the given array: " + aray.length); 
   }
}   

Output

Elements of the given array: 
11 21 13 23 30 
Length of the given array: 5

In the above code, we have declared an array of size 5, which means it can store up to 5 elements. Then, using a for-each loop, we retrieved all the elements and determined the size of the given array with the help of the length property.

The Chinese translation of

Example 2

is:

Example 2

In this example, we will declare and initialize a String array. Then, using a for-each loop, we will print its element. In the end, with the help length property, we determine the size of given array.

import java.util.*;
public class Example2 {
   public static void main(String[] args) {
      // declaration and initialization of the array
      String[] aray = { "Tutorix", "Tutorials", "Point", "Simply", "Easy",
         "Learning"            
         }; 
	  // printing the elements of array
	  System.out.println("Elements of the given array: ");
	  for(String elm : aray) {
	     System.out.print(elm + " "); 
      }
	  System.out.println();
	  // printing the length of array
      System.out.println("Length of the given array: " + aray.length); 
   }
}

Output

Elements of the given array: 
Tutorix Tutorials Point Simply Easy Learning 
Length of the given array: 6

Example 3

This is another example where we will find the size of an array without using any in-built property or method of Java.

method

• Declare and initialize two arrays. One is a string array and the other is an integer array

• Then, define two count variables of integer type to store the number of elements of the two arrays.

• Now, use the for-each loop to iterate and increment the counter variable by one with each iteration.

• Finally, print the results and exit.

import java.util.*;
public class Example3 {
   public static void main(String[] args) {
      // declaration and initialization of the arrays
      String[] aray1 = { "Tutorix", "Tutorials", "Point", "Simply", "Easy",
         "Learning"            
         }; 
      int[] aray2 = {58, 66, 74, 55, 62};
      // initial counter variable to store the count of elements
      int countr1 = 0;
      int countr2 = 0;
	  // printing the length of both arrays
	  for(String elm : aray1) {
	     countr1++;
	  }
	  for(int elm : aray2) {
	     countr2++;
	  }
      System.out.println("Length of the String array: " + countr1); 
      System.out.println("Length of the integer array: " + countr2); 
   }
}

Output

Length of the String array: 6
Length of the integer array: 5

in conclusion

In this article, we learned to use the length property to determine the size of a given array through a sample program. Additionally, we also discussed a way to find the length of an array without using any built-in methods and properties.

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