Re: Java 8 Lambda binary snapshot

From:
=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>
Newsgroups:
comp.lang.java.programmer
Date:
Sun, 13 Nov 2011 12:39:36 -0500
Message-ID:
<4ec000d8$0$293$14726298@news.sunsite.dk>
On 11/13/2011 12:12 PM, Roedy Green wrote:

On Fri, 11 Nov 2011 16:20:03 -0800 (PST), Lew<lewbloch@gmail.com>
wrote, quoted or indirectly quoted someone who said :

I look at Java closures as just syntactic sugar for anonymous interface implementations,
and conversely, as anonymous interface implementations as a poor-man's closure.


You would do the Java community a great service by posting two
snippets:

one coded the Smith Barney way with anonymous classes and another with
a rough approximation to the new closures.


Anonymous class:

         ArrayList<String> lst = new ArrayList<String>();
         lst.add("A");
         lst.add("BB");
         lst.add("CCC");
         Collections.sort(lst, new Comparator<String>() {
            public int compare(String s1, String s2) {
                return -s1.compareTo(s2);
            }
         });
         for(String s : lst) {
             System.out.println(s);
         }

Java 8 lambda:

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

public class Lambda {
     public static void main(String[] args) {
         ArrayList<String> lst = new ArrayList<String>();
         lst.add("A");
         lst.add("BB");
         lst.add("CCC");
         Collections.sort(lst, (s1,s2)-> -s1.compareTo(s2));
         for(String s : lst) {
             System.out.println(s);
         }
     }
}

Arne

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