Advertisement
Google Ad Slot: content-top
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 |
|---|---|---|
Returns the number of elements in the array |
int[] arr = {10, 20, 30, 40, 50};
System.out.println(arr.length); // Output: 5
|
|
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]
|
|
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
|
|
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
|
|
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
|
|
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] |
|
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]
|
|
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.
Converting Array to String:
Converts an array to a string.
Searching in an Array:
Searches for a key in a sorted array.
Comparing Arrays:
Arrays.equals()→ Compares two arrays for equality.Arrays.deepEquals()→ Compares two multi-dimensional arrays for equality.
Filling an Array:
Fills an array with a specific value.
Sorting an Array:
Sorts an array in ascending order.
Copying Arrays:
Copies an array to a new array.