Collections.sort(List, Comparator) in Java

Collections.sort(List, Comparator): This method is available in java.util.Collections class of Java.

Syntax:

<E> void java.util.Collections.sort(List<E> list, Comparator<? super E> c)

This method takes two arguments. This method sorts the specified list according to the order induced by the specified comparator.

Parameters: Two parameters are required for this method.

list: the list to be sorted.

c: the comparator to determine the order of the list. A null value indicates that the elements' natural ordering should be used.

Throws:

1. ClassCastException - if the list contains elements that are not mutually comparable using the specified comparator.

2. UnsupportedOperationException - if the specified list'slist-iterator does not support the set operation.

3. IllegalArgumentException - if the comparator is found to violate the Comparator contract.

Approach

Java

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Collectionssort2 {
    public static void main(String[] args) {

        List<Integer> arrlist = new ArrayList<Integer>();

        arrlist.add(12);
        arrlist.add(56);
        arrlist.add(899);
        arrlist.add(65);
        arrlist.add(5);

        Collections.sort(arrlist, Collections.reverseOrder());
        System.out.println(arrlist);

    }
}

Output:

[899, 65, 56, 12, 5]