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What is an Array Class in Java and How to Implement it?

Published on Oct 15,2019 4.8K Views

22 / 72 Blog from Java Core Concepts

I am sure that many of you are already familiar with the term Array! In this tutorial, we are going to learn about the array class in Java. The Array class in java.util.package is a part of the Java collection framework. Let us study this topic in detail.
The agenda for this article is:

What is an Array class in Java?

The Array class is contained in java.util.package. Java Arrays are created and accessed through the static methods that are provided by this class. The methods of this class can be accessed by the class name. Only static methods are present and the methods of the object class.
This class contains various methods for manipulating arrays.

Class declaration
Here is how you can declare the class.

public class Arrays
extends Object

Class hierarchy


Method inherited
The method inherited is Java.util object

Moving ahead, let’s see the syntax of this class.


Arrays.<function name>;

There are several methods that are used in this class. Have a look at them!


Methods in Array class

static int binarySearch(elementToBeSearched)This method uses a binary search algorithm to search the specified element in the array.
compare(array 1, array 2)It compares two arrays passed as parameters.
compareUnsigned(array 1, array 2)It compares two arrays, numerically treating elements as unsigned.
static boolean deepEquals(Object[] a, Object[] b)It returns true if the two specified arrays are deeply equal to one another
static int deepHashCode(Object[] a)It returns a hash code based on the “deep contents” of the specified Arrays
equals(array1, array2)It checks if both the arrays are equal or not
fill(originalArray, fillValue)It assigns this fillValue to each index of this Array
hashCode(originalArray)It returns an integer hashCode of the specified array.
mismatch(array1, array2)It searches and returns the index of the first unmatched element between the two specified arrays.
static List asList(T… a)It returns a fixed-size list backed by the specified Array
copyOf(originalArray, newLength)It copies the specified array, truncating the default value (if required) so the copy has the specified length.
parallelSort(originalArray)It sorts the specified array using parallel sort.

Now, let talk about the need for this specific class!


Why do we need an Array Java class?

I’m enlisting a few points to answer this question. You will encounter several situations where you have to apply the concept of loops but array Java class provides you with several static methods. These methods can help you to perform the task without the use of loops! You can sort arrays, search arrays, modify them and so on!

With this, we come to the end of this article. I hope you have understood the Array class in Java, their types, importance and their implementation through some real-time examples.

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What is an Array Class in Java and How to Implement it?