public static Comparator reverseOrder();

package in.bench.resources.java.collections;

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

public class SortingArrayListContentsInDescendingOrder {

	public static void main(String[] args) {

		// creating ArrayList object of type String
		ArrayList<String> companies = new ArrayList<String>();

		// adding elements to ArrayList object
		companies.add("LinkedIn");
		companies.add("Amazon");
		companies.add("Google");
		companies.add("Apple");
		companies.add("Facebook");
		companies.add("Oracle");
		companies.add("Microsoft");

		// Iterating using enhanced for-loop
		System.out.println("Before Sorting : Insertion Order\n");
		for(String company : companies) {
			System.out.println(company);
		}

		// to sort ArrayList contents in ascending order
		Collections.sort(companies);

		// reverse order of ArrayList contents
		System.out.println("\n\n\nAfter Sorting : "
				+ "ascending order\n");
		for(String company : companies) {
			System.out.println(company);
		}

		// to reverse sort ArrayList contents
		Collections.sort(companies, Collections.reverseOrder());

		// reverse order of ArrayList contents
		System.out.println("\n\n\nAfter reverseOrder : "
				+ "descending order\n");
		for(String company : companies) {
			System.out.println(company);
		}
	}
}

Before Sorting : Insertion Order

LinkedIn
Amazon
Google
Apple
Facebook
Oracle
Microsoft

After Sorting : ascending order

Amazon
Apple
Facebook
Google
LinkedIn
Microsoft
Oracle

After reverseOrder : descending order

Oracle
Microsoft
LinkedIn
Google
Facebook
Apple
Amazon