Array Class in Java

A component of the collections framework in Java Collection called as Arrays class is included in the java.util package. To dynamically construct and retrieve Java arrays, this class offers static methods. It only includes static methods and Object class methods. This class's name itself can use any of its methods. In this article, we will be discussing the array class in detail, the need for an array class, and a few examples of methods present in the array class.

Introduction Of Array Class in Java

An array is often a group of similar-type elements with a single contiguous memory address. The initial element of an array is placed at index 0, the second member is kept at index 1, and so forth. Arrays in Java are index-based. The Arrays class provides only static methods, which are all members of the 'Object' class. Since the array methods are static in nature, the class name itself can be used to access them.

The user must be perplexed as to why we require the array class in Java though we can declare, initialize, and compute array-related actions. The answer to this, however, is found in given class methods, which we will cover in more detail since realistically speaking, these functions assist programmers in broadening their usage of arrays. For instance, loops are frequently used to perform certain activities on an array like:

Give a specific value to an array as:

  • Sort the Arrays.
  • Search in the Arrays.

The hierarchy of the class is stated as follows: 

java.lang.Object

java.util.Arrays

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Methods of Array Class in Java 

There are a number of static methods in the Arrays class in the java.util package that could be used for filling, searching, sorting, etc. in arrays. Let us now have a look at the methods of an array class in Java below. 

1. asList() - A fixed-size list supported by the provided Arrays is returned.

2. binarySearch() - uses the algorithm of the Binary Search Algorithm to look for any provided element in the array.

3. binarySearch(array, fromIndex, toIndex, key, Comparator) - utilizes the algorithm of Binary Search to search a portion of the supplied array for the desired object.

4. compare(array1, array2) - lexicographically compares two arrays that are supplied as parameters

5. copyOf(OriginalArray, newLength) - Duplicates the provided array, trimming or padding as necessary to make the clone the desired length.

6. copyOf(OriginalArray, fromIndex, endIndex) - creates a new Array by copying the desired range of the supplied array.

7. deepEquals(Object[ ] x1, Object[ ] x2) - If the two supplied arrays are truly similar to one another, the function returns true.

8. deepHashCode(Object[ ] x) - based on the "deep contents" of the supplied Arrays, returns a hash code.

9. deeptoString(Object[ ] x) - provides the representation of a string of the Arrays' "deep contents" in response.

10.  equals(Array1, array2) - determines whether or not the two arrays are equal.

11. Fill (OriginalArray, fillValue) - This fill value is assigned to each index in the array.

12. hashCode(originalArray) - returns the array instance's integer hashCode.

13. mismatch(array1, array2) - determines the position of the first element among the two supplied arrays that is not a match.

14. parallelPrefix(originalArray, fromIndex, endIndex, functionalOperator) - parallelPrefix is executed for the array's specified range using the given functional operator.

15. parallelPrefix(originalArray, operator) - Prefixes an entire array in parallel using the supplied functional operator.

16. parallelSetAll(originalArray, functionalGenerator) - utilizing the generator function that is provided, sets every element of this array simultaneously.

17. parallelSort(originalArray) -  uses parallel sort to order the given array.

18. setAll(originalArray, functionalGenerator) - utilizes the provided generating function to set every element of the defined array.

19.  sort(originalArray) - The entire array is sorted in ascending order.

20. sort(originalArray, fromIndex, endIndex) - Sorts an array's provided range in ascending order.

21. sort(T[ ] x, int fromIndex, int toIndex, Comparator< super T> c) - Sorts the range of the supplied array of objects in the order that the specified comparator has produced.

22. sort(T[ ] x, Comparator< super T> c) - Sorts the objects in the supplied array in the order that the specified comparator has produced.

23.  spliterator(originalArray) - Returns a Spliterator that includes every Array given.

24. spliterator(originalArray, fromIndex, endIndex) - gives back a Spliterator of the requested array type that covers the length of the given arrays.

25. stream(originalArray) - gives back a stream of sequential data with the given array as the source.

26. toString(originalArray) - The values of the array are displayed as a string in the response. The array's elements are listed in the string representation between square brackets ("[]"). A comma and a space are used to denote the separation of adjacent components. The String.valueOf() method converts elements to strings.

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Java Method Examples

1. Let us see a Java example below to understand asList() method:

import java.util.Arrays;


class HKR{

 

public static void main(String[] args)

{

int intArr[] = { 10, 20, 15, 22, 35 };


System.out.println("The integer Array as a List is: "

+ Arrays.asList(intArr));

}

}

The output of the Java program will be:

The integer Array as a List is: [[I@19469ea2]

2. Let us see a Java example below to understand binarySearch()  method:

import java.util.Arrays;


public class HKR {

public static void main(String[] args)

{


int intArr[] = { 100, 200, 150, 220, 305 };


Arrays.sort(intArr);


int intKey = 200;

System.out.println(

intKey + " found at an index = "

+ Arrays.binarySearch(intArr, intKey));

}

}

The output of the Java program will be:

200 found at an index = 2

3. Let us see a Java example below to understand binarySearch(array, fromIndex, toIndex, key, Comparator) method:

import java.util.Arrays;


public class Main {

public static void main(String[] args)

{


int intArr[] = { 100, 200, 150, 220, 305 };


Arrays.sort(intArr);

int intKey = 200;


System.out.println(

intKey

+ " is found an index = "

+ Arrays

.binarySearch(intArr, 2, 3, intKey));

}

}

The output of the Java program will be:

200 is found at an index = 2

4. Let us see a Java example below to understand compare(Array1, Array2) method:

import java.util.Arrays;


public class Main {

public static void main(String[] args)

{

int intArr[] = { 100, 200, 150, 220, 305 };


int intArr1[] = { 100, 150, 220 };

System.out.println("The integer Arrays on comparison is: "

+ Arrays.compare(intArr, intArr1));

}

}

The output of the Java program will be:

The integer Arrays on comparison is: 1

5. Let us see a Java example below to understand compareUnsingned(Array1, Array2) method:

import java.util.Arrays;


public class Main {

public static void main(String[] args)

{


int intArr[] = { 100, 200, 150, 220, 305 };


int intArr1[] = { 100, 150, 220 };


System.out.println("The integer Arrays on comparison is: "

+ Arrays.compareUnsigned(intArr, intArr1));

}

}

The output of the Java program will be:

The integer Arrays on comparison is: 1

6. Let us see a Java example below to understand copyOf(originalArray, newLength) method:


import java.util.Arrays;


public class Main {

public static void main(String[] args)

{

int intArr[] = { 100, 200, 150, 220, 305 };


System.out.println("The Integer Array: "

+ Arrays.toString(intArr));


System.out.println("\nThe New Arrays by copyOf:\n");

System.out.println("Integer Array: "

+ Arrays.toString(

Arrays.copyOf(intArr, 15)));

}

}

The output of the Java program will be:

The Integer Array: [100, 200, 150, 220, 305]

The New Arrays by copyOf: Integer Array: [100, 200, 150, 220, 305, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

Need of Array Class in Java

  • Java arrays can be created and accessed dynamically using static methods provided by this class.
  • Java arrays can be created and accessed dynamically using static methods provided by the Array class.
  • Java array class can be created and accessed dynamically using static methods provided by an array class
  • There is neither a memory deficit nor an overflow because the array is fixed in size and placed in adjacent memory locations. Any sort of data with a fixed size should be stored.

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Conclusion

In this article, we have talked about the Array class in Java. A component of the collections framework in Java Collection called as Arrays class is included in the java.util package. To dynamically construct and retrieve Java arrays, this class offers static methods. It only includes static methods and Object class methods. This class's name itself can use any of its methods. We have also discussed the need for an array class, and a few examples of methods present in the array class. 

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Amani
Amani
Research Analyst
As a content writer at HKR trainings, I deliver content on various technologies. I hold my graduation degree in Information technology. I am passionate about helping people understand technology-related content through my easily digestible content. My writings include Data Science, Machine Learning, Artificial Intelligence, Python, Salesforce, Servicenow and etc.

A component of the collections framework in Java Collection called as Arrays class is included in the java.util package. To dynamically construct and retrieve Java arrays, this class offers static methods

Array is actually an object in Java

Java arrays can be created and accessed dynamically using static methods provided by an array class

Array is a data type in Java 

The syntax is identical to that used for a regular variable declaration, but to define the size of each element of the array, subscripts should come after the variable name.

The ability to hold several items and values under a single identifier makes arrays the main reason they exist.

Multiple data of the same name and similar types are stored in arrays.

Only data from the ending of the array can be added to or removed.