RevStrSort

/**
 * Sort an array of strings in reverse order. 
 */

package StrRegex;

import java.util.*;

/**
 * Create a comparator that returns the outcome
 * of a reverse string comparison.
 */
class RevStrComp implements Comparator< String > {
	
	/**
	 * Implement the compare() method so that it
	 * reverses the order of the string comparison.
	 */
	public int compare(String strA, String strB) {
		//  Compare strB to strA, rather than strA to strB.
		return strB.compareTo(strA);
	}
}

/**
 * Demonstrate the reverse string comparator.
 */
public class RevStrSort {

	/**
	 * @param args
	 */
	public static void main(String[] args) {

		// Create a sample array of strings.
		String strs[] = { "dog", "horse", "zebra", "cow", "cat" };

		// Show the initial order.
		System.out.print("Initial order : ");
		for (String s : strs) {
			System.out.print(s + " ");
		}

		System.out.println("\n");

		// Sort the array in reverse order.
		// Begin by creating a reverse string comparator.
		RevStrComp rsc = new RevStrComp();
		// Now, sort the strings using the reverse comparator.
		Arrays.sort(strs, rsc);

		// Show the reverse sorted order.
		System.out.print("Sorted in reverse order : ");
		for (String s : strs) {
			System.out.print(s + " ");
		}

		System.out.println("\n");

		// For comparison, sort the strings in natural order.
		Arrays.sort(strs);

		// Show the natural sorted order.
		System.out.print("Sorted in natural order : ");
		for (String s : strs) {
			System.out.print(s + " ");
		}

		System.out.println("\n");
	}
}