Re: refactoring problem

From:
Robert Klemme <shortcutter@googlemail.com>
Newsgroups:
comp.lang.java.programmer
Date:
Sun, 03 Feb 2013 21:38:27 +0100
Message-ID:
<an8067F49jkU1@mid.individual.net>
On 03.02.2013 19:50, Peter Duniho wrote:

On Sun, 03 Feb 2013 13:32:08 -0500, Arne Vajh=F8j wrote:

[...]

(int a; double b; String c) = multiReturnValueMethod();

sure does look funky!


Perl does it.


How do I phrase this to avoid a language war.

Hm.

Perl is not designed to make it difficult to write funky code.


Well put, Arne! ;-)

On the other hand, F# is designed that way and it supports tuple return=

values as well.

I doubt we'll ever see the feature in C-based languages like Java and C=

#,

but there are other languages that support it, and in at least some of
those examples, they do it gracefully.


If you want a language that does it gracefully and runs on the JVM you
can pick JRuby.

That said, it seems perfectly fine to me in Java to declare a container=

type to allow multiple values to be returned. It's a common enough idio=

m

and works well.


Absolutely!

And if it was as easy as in (J)Ruby to declare a simple data container
class it would even be convenient.

# Ruby (without final though)
FooBar = Struct.new :name, :length, :color

// Java
public struct FooBar {
   final String name;
   int length;
   Color color;
}

could generate

public class FooBar {
   private final String name;
   private int length;
   private Color color;

   public(String name) {
     this.name = name;
   }

   public(String name, int length, Color color) {
     this.name = name;
     this.length = length;
     this.color = color;
   }

   public String getName() { return name; }
   // ...

   @Override
   public int hashCode() {...}

   @Override
   public boolean equals(Object o) {...}

}

Cheers

    robert

--
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