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POSimple tutorial example (lambda expression) doesn't run
 

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  1. POSimple tutorial example (lambda expression) doesn't run
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    <p>Finally decided to start a bit of experimentation on the new features of jdk8, namely the <a href="http://docs.oracle.com/javase/tutorial/java/javaOO/lambdaexpressions.html" rel="nofollow">lambda expressions following the tutorial</a>. For convenience, I stripped-down the example, see SSCCE below. </p> <p>Typing out the predicate just runs fine, refactoring it to a lambda expression as suggested (and actually done) by Netbeans compiles (?) without errors, but doesn't run. The laconic console printout is </p> <blockquote> <p>Fehler: Hauptklasse simple.Simple konnte nicht gefunden oder geladen werden</p> </blockquote> <p>("Error: main class couldn't be found or loaded")</p> <p>Environment:</p> <ul> <li>jdk: jdk-8-ea-bin-b102-windows-i586-08_aug_2013.exe</li> <li>Netbeans 7.4 beta, bundle from 14.7.2013. Not sure if that's the latest, couldn't download from the Netbeans site (got a "content encoding error" when clicking on its download link)</li> </ul> <p>BTW, thought of using Netbeans only because it already has support for jdk8 (if not netbeans, who else ;-) - the eclipse beta preview from efxclipse has a similar issue (compiling but not running the example). So being definitely out off my comfort zone, possibly some very stupid mistake on my part... ? </p> <pre><code>package simple; import java.util.ArrayList; import java.util.List; import java.util.function.Predicate; public class Simple { /** * @param args the command line arguments */ public static void main(String[] args) { List&lt;Member&gt; members = createMembers(); // implement predicate directly, runs fine // Predicate&lt;Member&gt; predicate = new Predicate&lt;Member&gt;() { // public boolean test(Member member) { // return member.getAge() &gt;= 18; // } // }; // predicate converted to lambda, fails to run // "class couldn't be found" Predicate&lt;Member&gt; predicate = (Member member) -&gt; member.getAge() &gt;= 18; for (Member member : members) { if (predicate.test(member)) { member.printMember();; } } } public static class Member { private String name; private int age; public Member(String name, int age) { this.name = name; this.age = age; } public int getAge() { return age; } public void printMember() { System.out.println(name + ", " + getAge()); } } private static List&lt;Member&gt; createMembers() { List&lt;Member&gt; members = new ArrayList&lt;&gt;(); members.add(new Member("Mathilda", 45)); members.add(new Member("Clara", 15)); members.add(new Member("Gloria", 18)); return members; } } </code></pre>
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    1. USStuart Marks
    1. USkleopatra
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    1. CODid you try running it from Command line?
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      1. USRohit Jain
    2. CO@RohitJain no, I hate the command line even more than Netbeans ;-) Curious: does the example (using the lambda) run in your context, either IDE or commandline?
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    3. COIt runs fine on IntelliJIdea. Well, the problem is somewhere else. You are probably trying to run a different file. The error you got suggests this only. Make sure you are running the same file.
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