How to sort an ArrayList in Ascending Order in Java

Last Updated : 19 Apr, 2023

Given an unsorted ArrayList, the task is to sort this ArrayList in ascending order in Java. Examples:

Input: Unsorted ArrayList: [Geeks, For, ForGeeks, GeeksForGeeks, A computer portal] Output: Sorted ArrayList: [A computer portal, For, ForGeeks, Geeks, GeeksForGeeks] Input: Unsorted ArrayList: [Geeks, For, ForGeeks] Output: Sorted ArrayList: [For, ForGeeks, Geeks]

Approach: An ArrayList can be Sorted by using the sort() method of the Collections Class in Java. This sort() method takes the collection to be sorted as the parameter and returns a Collection sorted in the Ascending Order by default. Syntax:

Collections.sort(ArrayList);

Below is the implementation of the above approach:

Java

// Java program to demonstrate
// How to sort ArrayList in ascending order

import java.util.*;

public class GFG {
    public static void main(String args[])
    {

        // Get the ArrayList
        ArrayList<String>
            list = new ArrayList<String>();

        // Populate the ArrayList
        list.add("Geeks");
        list.add("For");
        list.add("ForGeeks");
        list.add("GeeksForGeeks");
        list.add("A computer portal");

        // Print the unsorted ArrayList
        System.out.println("Unsorted ArrayList: "
                           + list);

        // Sorting ArrayList in ascending Order
        // using Collection.sort() method
        Collections.sort(list);

        // Print the sorted ArrayList
        System.out.println("Sorted ArrayList "
                           + "in Ascending order : "
                           + list);
    }
}

Output:

Unsorted ArrayList: [Geeks, For, ForGeeks, GeeksForGeeks, A computer portal]
Sorted ArrayList in Ascending order : [A computer portal, For, ForGeeks, Geeks, GeeksForGeeks]