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Java 8 closures vs. anonymous inner classes

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Someone made a passing comment in another thread to the effect that Java 
8 lambdas ("closures") were nothing but syntactic sugar for (anonymous) 
inner classes. Here are a three differences:

1) lambdas can only instantiate "functional" (single abstract method) 
interfaces

2) lambdas have different scoping rules ("this" means different things)

3) lambdas perform better due to the use of the invokedynamic JVM 
instruction. Type representation, instance creation, and invocation 
strategy are decided at runtime. This offers optimization potentials,
because evaluating a lambda expression need not create a new instance 
each time. There could be „shared lambdas“ through use of a constant 
static method in a constant pool, needing no new class and/or new object.

This is quite a bit more than what I'd call "syntactic sugar".

-- Sebastian

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Java 8 closures vs. anonymous inner classes Sebastian <news@seyweiler.dyndns.org> - 2013-12-04 20:07 +0100
  Re: Java 8 closures vs. anonymous inner classes Sven Köhler <remove-sven.koehler@gmail.com> - 2013-12-04 22:27 +0200
    Re: Java 8 closures vs. anonymous inner classes Patrick Roemer <sangamon@netcologne.de> - 2013-12-05 00:38 +0100
    Re: Java 8 closures vs. anonymous inner classes v_borchert@despammed.com (Volker Borchert) - 2013-12-04 23:45 +0000
  Re: Java 8 closures vs. anonymous inner classes Roedy Green <see_website@mindprod.com.invalid> - 2013-12-06 13:28 -0800
    Re: Java 8 closures vs. anonymous inner classes Arne Vajhøj <arne@vajhoej.dk> - 2013-12-14 16:46 -0500
  Re: Java 8 closures vs. anonymous inner classes Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-12-14 03:13 -0400
    Re: Java 8 closures vs. anonymous inner classes "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2013-12-14 12:03 +0000
      Re: Java 8 closures vs. anonymous inner classes Arne Vajhøj <arne@vajhoej.dk> - 2013-12-14 17:02 -0500
        Re: Java 8 closures vs. anonymous inner classes Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-12-15 14:33 -0400
    Re: Java 8 closures vs. anonymous inner classes Arne Vajhøj <arne@vajhoej.dk> - 2013-12-14 17:00 -0500
      Re: Java 8 closures vs. anonymous inner classes Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-12-15 15:05 -0400
        Re: Java 8 closures vs. anonymous inner classes Wanja Gayk <brixomatic@yahoo.com> - 2013-12-17 20:09 +0100
          Re: Java 8 closures vs. anonymous inner classes Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-12-20 22:28 -0400
            Re: Java 8 closures vs. anonymous inner classes lipska the kat <"lipskathekat at yahoo dot co dot uk"> - 2013-12-21 11:54 +0000
              Re: Java 8 closures vs. anonymous inner classes Joerg Meier <joergmmeier@arcor.de> - 2013-12-21 18:27 +0100
                Re: Java 8 closures vs. anonymous inner classes lipska the kat <"lipskathekat at yahoo dot co dot uk"> - 2013-12-21 18:23 +0000
                Re: Java 8 closures vs. anonymous inner classes Tim Slattery <tim@risingdove.com> - 2013-12-21 14:56 -0500
                Re: Java 8 closures vs. anonymous inner classes lipska the kat <"lipskathekat at yahoo dot co dot uk"> - 2013-12-21 20:10 +0000
                Re: Java 8 closures vs. anonymous inner classes lipska the kat <"lipskathekat at yahoo dot co dot uk"> - 2013-12-21 21:18 +0000
              Re: Java 8 closures vs. anonymous inner classes Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-12-21 14:52 -0400
                Re: Java 8 closures vs. anonymous inner classes lipska the kat <"lipskathekat at yahoo dot co dot uk"> - 2013-12-21 19:35 +0000
                Re: Java 8 closures vs. anonymous inner classes Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-12-21 19:34 -0400
                Re: Java 8 closures vs. anonymous inner classes leif.roar@invalid.com (Leif Roar Moldskred) - 2013-12-22 05:02 -0600
                Re: Java 8 closures vs. anonymous inner classes lipska the kat <"lipskathekat at yahoo dot co dot uk"> - 2013-12-22 11:12 +0000
                Re: Java 8 closures vs. anonymous inner classes Wanja Gayk <brixomatic@yahoo.com> - 2013-12-22 21:24 +0100

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