JetBrains IntelliJ IDEA Blog

14 Responses to “Check lambda support in IntelliJ IDEA 12 EAP build 122.202”

1. Dee Says:
   August 24th, 2012 at 12:48 pm

   No way. Just No way! Niice

2. jtonic Says:
   August 24th, 2012 at 7:55 pm

   Great news.

   I’ve created a java project with latest JDK8 and I didn’t managed to run it:
   error: lambda expressions are not supported in -source 1.8
   (use -source 8 or higher to enable lambda expressions)
   I’ve tried to configure the Java Compiler additional options without success.

   Also Idea complains about creating a new TreeSet passing an inline lambda expression. If I extract the lambda expression in a separate local variable the error has gone.

   Code:
   public class LambdaTest {
   public static void main(String[] args) {
   Comparator c = (o1, o2)->{
   return o2.compareToIgnoreCase(o1);
   };
   Set strs = new TreeSet(c);
   strs.add(”Roxana”);
   strs.add(”Antonel”);
   strs.add(”Tutye”);
   strs.add(”Irina”);

   for (String str : strs) {
   System.out.println(”str = ” + str);
   }
   }
   }

   Regards

3. Kon Soulianidis Says:
   August 25th, 2012 at 10:34 pm

   Hi jtonic
   Make sure you get the correct build of JDK8 with lambdas enabled. http://jdk8.java.net/lambda/
   The regular one does not have it
   Best
   Kon

4. Anna Kozlova Says:
   August 27th, 2012 at 3:50 am

   Hello,
   in order to get java build with lambda support you need to download it from http://jdk8.java.net/lambda/. It is not merged yet in the common repository, sorry not mentioned that.

5. Denny Says:
   August 27th, 2012 at 5:01 am

   What’s the font in the picture?

6. jtonic Says:
   August 27th, 2012 at 1:41 pm

   Thank you Anna

   It works.

   Regarding the other issue, is it a JDK-1.8 issue or IDE one?

   Regards

7. Anna Kozlova Says:
   August 28th, 2012 at 1:40 am

   Hi,
   actually this code
   {code}
   Set strs = new TreeSet();
   strs.add(”");
   for (String str : strs) {}
   {code}
   should not compile (and is highlighted in IDEA) as ’strs’ has raw type and cant be converted without cast to Set.
   On the other hand code
   {code}
   Set strs = new TreeSet((o1, o2) -> {
   return o2.compareToIgnoreCase(o1);
   });
   {code}
   compile but is highlighted in the IDE. Will investigate the problem. Thanks

8. Anna Kozlova Says:
   August 30th, 2012 at 12:57 pm

   The font is default (Tahoma 11)

9. JohnPaul Says:
   September 19th, 2012 at 3:34 am

   public class MyClassTest extends TestCase {
   public void testFoo() {
   Comparable integerComparable = new Comparable() {
   @Override
   public int compareTo(Integer o) {
   return 0;
   }
   };
   }
   }

   does not offer an intention.

   $ java -version
   openjdk version “1.8.0-ea”
   OpenJDK Runtime Environment (build 1.8.0-ea-lambda-nightly-h1171-20120911-b56-b00)
   OpenJDK Client VM (build 24.0-b21, mixed mode)

   Idea @IU-122.337

   Any ideas?

10. Anna Kozlova Says:
    September 21st, 2012 at 3:04 am

    Works here. Could you please check that your module has 1.8 language level. Otherwise IDEA would treat lambdas as unsupported feature, hence no intention would be suggested.
    Thanks

11. Davide Says:
    December 11th, 2012 at 10:57 am

    is there already also support for map, filter and reduce operations on collections? Looks great anyway! Great job.

12. Anna Kozlova Says:
    December 12th, 2012 at 5:38 am

    Davide, what support do you expect? Thanks

13. David Turanski Says:
    March 19th, 2013 at 9:16 am

    Re. Collections support. Basic lambda examples are working for me. When I tried to do something simple like List.forEach {} it doesn’t compile. It appears it’s not part of the latest jdk 8 build yet, but I may be missing something. Does this work today?

14. Anna Kozlova Says:
    March 19th, 2013 at 11:15 am

    To be sure you need to download java from http://jdk8.java.net/lambda/.