Java Array Methods

In Java, arrays themselves are not objects with built-in methods, but you can use methods from utility classes like java.util.Arrays to manipulate arrays. Here's a list of basic operations and common methods used with arrays in Java:

Method	Description	Example
length	Returns the number of elements in the array	int[] arr = {10, 20, 30, 40, 50}; System.out.println(arr.length); // Output: 5
Arrays.toString()	Converts an array to a string.	import java.util.Arrays; int[] arr = {10, 20, 30}; System.out.println(Arrays.toString(arr)); // Output: [10, 20, 30]
Arrays.binarySearch()	Searches for a key in a sorted array.	import java.util.Arrays; int[] arr = {10, 20, 30, 40}; int index = Arrays.binarySearch(arr, 30); System.out.println(index); // Output: 2
Arrays.equals()	Compares two arrays for equality.	import java.util.Arrays; int[] arr1 = {10, 20, 30}; int[] arr2 = {10, 20, 30}; System.out.println(Arrays.equals(arr1, arr2)); // Output: true
Arrays.deepEquals()	Compares two multi-dimensional arrays for equality.	import java.util.Arrays; int[][] arr1 = {{1, 2}, {3, 4}}; int[][] arr2 = {{1, 2}, {3, 4}}; System.out.println(Arrays.deepEquals(arr1, arr2)); // Output: true
Arrays.fill()	Fills an array with a specific value.	import java.util.Arrays; int[] arr = new int[5]; Arrays.fill(arr, 7); System.out.println(Arrays.toString(arr)); // Output: [7, 7, 7, 7, 7]
Arrays.sort()	Sorts an array in ascending order.	import java.util.Arrays; int[] arr = {30, 10, 20, 50}; Arrays.sort(arr); System.out.println(Arrays.toString(arr)); // Output: [10, 20, 30, 50]
Arrays.copyOf()	Copies an array to a new array.	import java.util.Arrays; int[] original = {1, 2, 3}; int[] copy = Arrays.copyOf(original, original.length); System.out.println(Arrays.toString(copy)); // Output: [1, 2, 3]

length:

The length property is used to find the size of an array.

Example

int[] arr = {10, 20, 30, 40, 50};

System.out.println("Length of the array: " + arr.length); // Output: 5

Try it yourself

Converting Array to String:

Converts an array to a string.

Example

import java.util.Arrays;

int[] arr = {10, 20, 30};

System.out.println(Arrays.toString(arr)); // Output: [10, 20, 30]

Try it yourself

Searching in an Array:

Searches for a key in a sorted array.

Example

import java.util.Arrays;

int[] arr = {10, 20, 30, 40};

int index = Arrays.binarySearch(arr, 30);

System.out.println(index); // Output: 2

Try it yourself

Comparing Arrays:

Arrays.equals() → Compares two arrays for equality.
Arrays.deepEquals() → Compares two multi-dimensional arrays for equality.

Arrays.equals()

import java.util.Arrays;

int[] arr1 = {10, 20, 30};

int[] arr2 = {10, 20, 30};

System.out.println(Arrays.equals(arr1, arr2)); // Output: true

Try it yourself

Arrays.deepEquals()

import java.util.Arrays;

int[][] arr1 = {{1, 2}, {3, 4}};

int[][] arr2 = {{1, 2}, {3, 4}};

System.out.println(Arrays.deepEquals(arr1, arr2)); // Output: true

Try it yourself

Filling an Array:

Fills an array with a specific value.

Example

import java.util.Arrays;

int[] arr = new int[5];

Arrays.fill(arr, 7);

System.out.println(Arrays.toString(arr)); // Output: [7, 7, 7, 7, 7]

Try it yourself

Sorting an Array:

Sorts an array in ascending order.

Example

import java.util.Arrays;

int[] arr = {30, 10, 20, 50};

Arrays.sort(arr);

System.out.println(Arrays.toString(arr)); // Output: [10, 20, 30, 50]

Try it yourself

Copying Arrays:

Copies an array to a new array.

Example

import java.util.Arrays;

int[] original = {1, 2, 3};

int[] copy = Arrays.copyOf(original, original.length);

System.out.println(Arrays.toString(copy)); // Output: [1, 2, 3]

Try it yourself

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Method

Description

Example

length:

Converting Array to String:

Searching in an Array:

Comparing Arrays:

Filling an Array:

Sorting an Array:

Copying Arrays: