Collections.sort() in Java

Collections.sort()
The Collections.sort() method in Java is used to sort elements of a List in ascending order. It is part of the java.util.Collections class and works with List implementations like ArrayList and LinkedList. It simplifies sorting by providing a built-in mechanism.

• Sorts elements based on natural ordering or custom Comparator
• Works with List implementations, not arrays
• Modifies the list in-place without creating a new list

Example: Sorting an ArrayList in ascending order

import java.util.*; 

public class Collectionsorting 
{ 
    public static void main(String[] args) 
    { 
        // Create a list of strings 
        ArrayList<String> al = new ArrayList<String>(); 
        al.add("Geeks For Geeks"); 
        al.add("Friends"); 
        al.add("Dear"); 
        al.add("Is"); 
        al.add("Superb"); 

        /* Collections.sort method is sorting the 
        elements of ArrayList in ascending order. */
        Collections.sort(al); 

        // Let us print the sorted list 
        System.out.println("List after the use of" + 
                        " Collection.sort() :\n" + al); 
    } 
}
//List after the use of Collection.sort() :
[Dear, Friends, Geeks For Geeks, Is, Superb]

Custom Sorting
Sorting an ArrayList according to user defined criteria. We can use Comparator Interface for this purpose.

References
https://www.geeksforgeeks.org/java/collections-sort-java-examples/