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// 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);

  }

}

// Sort an array of strings in reverse order.

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.

class RevStrSort {

  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");

  }

}

输出为：

Initial order: dog horse zebra cow cat

Sorted in reverse order: zebra horse dog cow cat

Sorted in natural order: cat cow dog horse zebra

 

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