How to sort an Array of Strings in Java
Last Updated :
16 Feb, 2024
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Array Of Strings
To sort an array of strings in Java, we can use Arrays.sort() function.
Java
// A sample Java program to// sort an array of strings// in ascending and descending// orders using Arrays.sort().import java.util.Arrays;import java.util.Collections;// Driver Classpublic class SortExample { // main method public static void main(String[] args) { String arr[] = { "practice.geeksforgeeks.org", "www.geeksforgeeks.org", "code.geeksforgeeks.org" }; // Sorts arr[] in ascending order Arrays.sort(arr); System.out.printf("Modified arr[] : \n%s\n\n", Arrays.toString(arr)); // Sorts arr[] in descending order Arrays.sort(arr, Collections.reverseOrder()); System.out.printf("Modified arr[] : \n%s\n\n", Arrays.toString(arr)); }} |
Output
Modified arr[] : Modified arr[] : [www.geeksforgeeks.org, practice.geeksforgeeks.org, code.geeksforgeeks.org]
ArrayList Of Strings
We have an ArrayList to sort, we can use Collections.sort()
Java
// A sample Java program to sort// an arrayList of strings// in ascending and descending// orders using Collections.sort().import java.util.ArrayList;import java.util.Collections;// Driver Classpublic class SortExample { // main method public static void main(String[] args) { ArrayList<String> al = new ArrayList<String>(); al.add("practice.geeksforgeeks.org"); al.add("www.geeksforgeeks.org"); al.add("code.geeksforgeeks.org"); // Sorts ArrayList in ascending order Collections.sort(al); System.out.println("Modified ArrayList : \n" + al); // Sorts arr[] in descending order Collections.sort(al, Collections.reverseOrder()); System.out.println("Modified ArrayList : \n" + al); }} |
Output
Modified ArrayList : Modified ArrayList : [www.geeksforgeeks.org, practice.geeksforgeeks.org, code.geeksforgeeks.org]
Sort an array of strings using a custom comparator
Java
// Java Program to Sort an array of strings// Using a custom comparatorimport java.io.*;import java.util.Arrays;import java.util.Comparator;// Driver Classclass SortStrings { // main method public static void main(String[] args) { String[] fruits = { "apple", "orange", "banana", "pear", "kiwi" }; // Sort the array of strings by length Arrays.sort(fruits, Comparator.comparing(String::length)); // Print statement System.out.println("Sorted fruits by length:"); for (String fruit : fruits) { System.out.println(fruit); } }} |
Output
Sorted fruits by length: pear kiwi apple orange banana
Java 8 Streams to sort an array of strings
In this method, the Arrays.stream(arrayOfStrings) creates a stream of strings from the array. The sorted() operation is then applied to the stream, which sorts the elements in their natural order (lexicographical order for strings). Finally, the forEach method is used to print each element of the sorted stream. This method leverages the functional programming features introduced in Java 8 with the Stream API.
Below is the Implementation of the above approach:
Java
// Java program for the above approachimport java.util.Arrays;import java.util.stream.Stream;public class StringArraySorting { public static void main(String[] args) { // Sample array of strings String[] arrayOfStrings = { "banana", "apple", "orange", "grape" }; // Using Java 8 Streams to sort the array Arrays .stream(arrayOfStrings) // Creating a stream // from the array .sorted() // Sorting the stream of strings .forEach(System.out::println); // Printing each // sorted element }}// This code is contributed by Susobhan Akhuli |
Output
apple banana grape orange
Time Complexity: O(NlogN)
Space Complexity: O(1)
