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From: Stanimir Stamenkov <s7an10@netscape.net>
Newsgroups: comp.lang.java.programmer
Subject: Re: I don't why I get 'not a statement' error in the following code...
Date: Wed, 05 Oct 2011 01:19:17 +0300
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Tue, 4 Oct 2011 14:55:12 -0700 (PDT), /Chad/:
> On Oct 4, 11:33 am, Patricia Shanahan wrote:
>
>> See the JLS,http://java.sun.com/docs/books/jls/third_edition/html/statements.html...
>>
>> Only certain types of expressions can be turned into a statement by
>> adding a semicolon. They all have at least potential for side-effects at
>> the top level.
>>
>> May I ask why you need to execute Test.x without doing anything with the
>> result?
> 
> I still don't see why this expression can't be turned into a
> statement.

Because it doesn't match any of the syntax constructions given in 
the Java Language Specification referenced above (learn to read):

        LocalVariableDeclarationStatement
        ClassDeclaration
        Statement

Your statement |Test.x;| is obviously not a local variable 
declaration nor class declaration, further:

Statement:
        StatementWithoutTrailingSubstatement
        LabeledStatement
        IfThenStatement
        IfThenElseStatement
        WhileStatement
        ForStatement

Yours is none of labeled, if-then, if-then-else, while or for 
statement, so:

StatementWithoutTrailingSubstatement:
        Block
        EmptyStatement
        ExpressionStatement
        AssertStatement
        SwitchStatement
        DoStatement
        BreakStatement
        ContinueStatement
        ReturnStatement
        SynchronizedStatement
        ThrowStatement
        TryStatement

The only posibility here is expression statement:

ExpressionStatement:
        StatementExpression ;

StatementExpression:
        Assignment
        PreIncrementExpression
        PreDecrementExpression
        PostIncrementExpression
        PostDecrementExpression
        MethodInvocation
        ClassInstanceCreationExpression

Which of the given above should match your statement?  Yours is 
neither assignment nor pre-increment, nor pre-decrement, nor 
post-increment, nor post-decrement, nor method invocation, nor 
class instance creation.

-- 
Stanimir