Created: 2023-09-02 18:47
Status: #concept
Subject: Programming
Tags: Java Class java.util Java Package

java.util.Arrays

This class contains various static methods for manipulating primitive T[] arrays (such as sorting and searching).

Common Methods

These are all static, so all we need is to import java.util.Arrays before using a Arrays.method().

sort(T[] arr): void sorts an array.
- sort(T[] arr, int from, int to) sorts a specific from and to range (exclusive).
equals(T[] arr1, T[] arr2): boolean checks if arrays are equal.
binarySearch(T[] arr, T value): int searches for a value using the Binary Search Algorithm.
- binarySearch(T[] arr, int from, int to, int value) does the same as above, but narrows the search in a specific from index and a to (exclusive).
toString(T[] arr): String serializes the array into a "[ ... ]" Java String.

int[] numbers = {8, 3, 7, 9, 1, 2, 4};
System.out.println(Arrays.toString(numbers));
Arrays.sort(numbers);
System.out.println(Arrays.toString(numbers));

[8, 3, 7, 9, 1, 2, 4]
[1, 2, 3, 4, 7, 8, 9]

References

Oracle Documentation