How to sort an ArrayList? java

How to sort an ArrayList? 

Collection class defines the following two sort methods

   1)public static void sort(list l)

    to sort acc. to default natural sorting order

    in this list should contains homogeneous object and comparable object otherwise we will

    get classCastexception

    list should not contain null otherwise we will get nullPointerException

    2)public static void sort(List l,Comparator c)

    to sort based on customized sorting

Do Check My Video On Utility Classes:

Example:

import java.util.ArrayList;

import java.util.Collection;

import java.util.Collections;

public class Test{

    

    public static void main(String[] args) {

        ArrayList<String> l = new ArrayList<>();

        l.add("z");

        l.add("a");

        l.add("k");

        l.add("n");

        // l.add(new Integer(10));//CCE

        //l.add(null);//NPE

        System.out.println("Before Sorting: "+l);//[z, a, k, n]

        Collections.sort(l);

        System.out.println("After Sorting: "+l);//[a, k, n, z]

    }

}

o/p:Before Sorting: [z, a, k, n]

      After Sorting: [a, k, n, z]