this works, but sometimes it cause memory problem for huge array ?!
Thanks
Kevin
On Wednesday, August 29, 2001, at 09:43 AM, Mark Phelps wrote:
> Store the information in memory using a class that implements the
> Collection
> interface. A Collection is simply a class that stores lists of things.
> ArrayList is an example of a class that allows you to store as many
> objects
> of any type as you want. It implements the Collection interface.
>
> Then retrieve or create an instance of a class that implements the
> Comparator interface. A comparator class is a class that can compare
> two of
> the objects you have stored in your collection. If you are just storing
> Strings then use the static getInstance() method of the Collator class
> to
> retrieve a comparator. It will give you a comparator object that knows
> how
> to sort Strings in a locale, (or geographic location), specific way.
> If you
> are storing custom objects then you may need to write your own class to
> do
> the comparison and have it implement the Comparator interface.
>
> You can then sort the collection using a single call to
> Collections.sort().
> This is a static method that takes a collection and a comparator as
> parameters. When the call finishes, the collection is sorted.
>
> Here is an example of some code that stores a list of Strings in an
> ArrayList and then sorts them using locale specific String comparisons.
>
> import java.util.*;
> import java.text.*;
>
> public class sorttest
> {
> static public void main( String[] args )
> {
> //Instantiate the collection class that will store the Strings.
> ArrayList myCollection = new ArrayList();
>
> //Put the Strings in the collection.
> myCollection.add("Phelps, Mark");
> myCollection.add("Jones, Fred");
> myCollection.add("Adams, Sally");
> myCollection.add("Gonzales, Jose");
>
> //Get a Collator object that is specific to this JVMs default locale.
> Collator myComparator = Collator.getInstance();
>
> //Call a static method in the Collections class to sort the
> collection.
> Collections.sort( myCollection, myComparator );
>
> //Print out the sorted Strings
> for( int loop = 0; loop < myCollection.size(); loop++ )
> {
> System.out.println( (String)myCollection.get( loop ) );
> }
> }
> }
>
> -----Original Message-----
> From: JustinMacCarthy [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, August 29, 2001 4:09 AM
> To: JRun-Talk
> Subject: Java Sorting
>
>
> What the best ways to sort somthing like these (eg by firstname ,
> surname
> ,position) but for 20000 rows ?.
>
> Assuming worst case ordering
>
> String[][] data =
>
> { "Stephen", "Cheng", "Vice President" },
> { "Joe", "Berrey", "Intern" },
> { "Adam", "Lipinski", "Director" },
> { "Lynne", "Teague", "Developer" }
> {..... etc }
>
> }
>
> Can do it Perl etc , but Im a Java newbie.
> Thanks
>
> J
>
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