Re: Stranger compiler error?

From:
Knute Johnson <nospam@rabbitbrush.frazmtn.com>
Newsgroups:
comp.lang.java.programmer
Date:
Sat, 11 Nov 2006 10:00:53 -0800
Message-ID:
<sdo5h.217905$Ry4.204029@newsfe10.phx>
Patricia Shanahan wrote:

Knute Johnson wrote:

Patricia Shanahan wrote:

Knute Johnson wrote:
...

        for (Enumeration<Integer> e=hash.keys(); e.hasMoreElements();)
            String[] array = hash.get(e.nextElement()); // <---- error

...

You are confusing two very different entities, a statement and a
variable declaration.

The for MUST be followed by a statement.

You have a local variable declaration, which is not itself a statement
but can appear in a compound statement, such as a brace-enclosed block.


I understand the issue here I just can't find in the JLS where it is
not a statement. In fact, JLS 14.4.4 Execution of Local Variable
Declarations "A local variable declaration statement is an executable
statement.", would seem to say otherwise.


ASCII does not work well for some of this, because it lacks distinct
fonts. Also I should have capitalized "Statement". I meant the syntax
element "Statement", not the English word "statement".

Section 14.5 Statements lists all the productions for the syntax element
Statement. It does not include the syntax element
LocalVariableDeclarationStatement.

The production:

IfThenStatement:
if ( Expression ) Statement

definitely requires a syntax element Statement.

Patricia


Patricia:

So do you think this was an arbitrary distinction or is there some
reason that a LocalVariableDeclarationStatement had to be immediately
contained by a block (read that braces). Is it because of the
possibility of multiple execution within the containing block of a 'for'
or other loop?

I found this by accident debugging some code. It would probably never
come up in normal usage. I do find I learn a lot about the subtleties
of the language though when you answer my questions.

Thanks,

--

Knute Johnson
email s/nospam/knute/

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