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From: =?UTF-8?Q?Arne_Vajh=c3=b8j?= <arne@vajhoej.dk>
Newsgroups: comp.lang.java.programmer
Subject: Re: Comparison structure?
Date: Tue, 4 Oct 2016 22:29:42 -0400
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On 10/4/2016 8:16 PM, Arne Vajhøj wrote:
> Well - if one is competing in a code obfuscation contest then I will
> suggest:
>
>     int compareMe = 1;
>     final int assignMe = cases[Integer.signum(compareMe - compareTo) +
> 1].option(compareMe, compareTo);
>     int compareTo = 2;
>
> with:
>
>     @FunctionalInterface
>     private interface Case {
>         public int option(int compareMe, int compareTo);
>     }
>     private static Case[] cases = { (me,to) -> me, (me,to) -> 4, (me,to)
> -> me + 2 };
>
> :-)

Well - I think the concept can actually be twisted into something
that is almost readable!

     @FunctionalInterface
     private static interface Case {
         public int option(int compareMe, int compareTo);
     }

     public static abstract class Comparison {
         protected Case lt;
         protected Case eq;
         protected Case gt;
         private int compareMe;
         private int compareTo;
         public Comparison(int compareMe, int compareTo) {
             this.compareMe = compareMe;
             this.compareTo = compareTo;
         }
         public int execute() {
             switch(Integer.signum(compareMe - compareTo)) {
                 case -1:
                     return lt.option(compareMe, compareTo);
                 case 0:
                     return eq.option(compareMe, compareTo);
                 case 1:
                     return gt.option(compareMe, compareTo);
                 default:
                     throw new RuntimeException("Bye bye");
             }
         }
     }

     int compareMe = 1;
     int compareTo = 2;
     final int assignMe = new Comparison(compareMe, compareTo) {
             {
                 lt = (me,to) -> me;
                 eq = (me,to) -> 4;
                 gt = (me,to) -> me + 2;
             }
         }.execute();

Arne