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    <p>Guava's goal is not to provide functional idioms in Java. From the <a href="http://code.google.com/p/guava-libraries/wiki/FunctionalExplained" rel="nofollow noreferrer">Functional Explained </a> Guava wiki page:</p> <blockquote> <p>Excessive use of Guava's functional programming idioms can lead to verbose, confusing, unreadable, and inefficient code. These are by far the most easily (and most commonly) abused parts of Guava, and when you go to preposterous lengths to make your code "a one-liner," the Guava team weeps.</p> <p>Please be sure, when using Guava's functional utilities, that the traditional imperative way of doing things isn't more readable. Try writing it out. Was that so bad? Was that more readable than the preposterously awkward functional approach you were about to try?</p> </blockquote> <p>Leaning too heavily on functional idioms makes not too much sense up to Java 7 as the overhead is too high (see <a href="http://cr.openjdk.java.net/~briangoetz/lambda/lambda-state-4.html" rel="nofollow noreferrer">vertical problem</a>). This will change with Java 8 which will change the way Java libraries and programs are design on the detail level. Things that make sense in Java up to 7 will be discouraged to some extent in Java 8. This will motivate a new edition of Effective Java and a lot of new APIs.</p> <p>If you're trying to teach functional programming it's probably better to stick to a (more or less) pure functional language. Every language that is a melange (or emulation) of FP and OOP will be a distraction.</p>
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    1. POIs there a good comparison between Functional Java and Guava?
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    1. USShonzilla
    1. USThomas Jung
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    1. COI should also point out the preceding sentence in that article: "As of Java 7, functional programming in Java can only be approximated through awkward and verbose use of anonymous classes. This is expected to change in Java 8, but Guava is currently aimed at users of Java 5 and above."
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      1. USLouis Wasserman
 

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