Can you reverse sort with Arrays.sort()?

I know I could just iterate backwards, but I wanted to know if you could reverse sort using Arrays.sort() ?

[114 byte] By [tvance929a] at [2007-11-26 20:50:18]

# 1

Yes.

You need to provide a Comparator that provides the opposite results fro the "normal" order. I think Collections has one called ReverseOrder.

[url=http://www.onjava.com/lpt/a/3286]Making Java Objects Comparable[/url]

http://java.sun.com/docs/books/tutorial/collections/interfaces/order.html

http://www.javaworld.com/javaworld/jw-12-2002/jw-1227-sort.html

jverda at 2007-7-10 2:14:48 >

# 2

import java.util.*;

public class SortExample {

public static void main(String[] args) {

String[] data = {"Hey", "ho", "here", "We", "go"};

Arrays.sort(data, Collections.reverseOrder());

System.out.println(Arrays.toString(data));

Arrays.sort(data, Collections.reverseOrder(String.CASE_INSENSITIVE_ORDER));

System.out.println(Arrays.toString(data));

}

DrLaszloJamfa at 2007-7-10 2:14:48 >

# 3

this is giving me compilation errors as below:

C:\TEMP\SortExample.java:7: toString() in java.lang.Object cannot be applied to (java.lang.String[])

System.out.println(Arrays.toString(data));

C:\TEMP\SortExample.java:8: reverseOrder() in java.util.Collections cannot be applied to (java.util.Comparator)

Arrays.sort(data, Collections.reverseOrder(String.CASE_INSENSITIVE_ORDER));

C:\TEMP\SortExample.java:9: toString() in java.lang.Object cannot be applied to (java.lang.String[])

System.out.println(Arrays.toString(data));

3 errors

any help.

ayusman_dikshita at 2007-7-10 2:14:48 >

# 4

You are getting those errors on methods introduced in version 5. The currentversion is now 6, so may I suggest you upgrade?

DrLaszloJamfa at 2007-7-10 2:14:48 >

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