How to get the line number in the code?

[Charles]

Is there a way to obtain the line number in my code? For example:
1 public class MyClass {
2 int a = 5;
3 System.out.prin tln("Integer variable a was set on line number: " + x);
4 etc.
Where x is equal to '2'.

How can I obtain 'x' ?

Thanks.

[Kathy Benson]

Re: How to get the line number in the code?

You cannot do that in Java. The only way to get line number is by
creating a Throwable object and then extracting the stack trace. You
cannot find the line number at compile time.

Regards,
KB





Charles wrote:
[color=blue]
>Is there a way to obtain the line number in my code? For example:
>1 public class MyClass {
>2 int a = 5;
>3 System.out.prin tln("Integer variable a was set on line number: " + x);
>4 etc.
>Where x is equal to '2'.
>
>How can I obtain 'x' ?
>
>Thanks.
>
>
>
>[/color]

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[hiwa]

Re: How to get the line number in the code?

Kathy Benson <fornewsgroups@ yahoo.com> wrote in message news:<3F7C995C. 90602@yahoo.com >...[color=blue]
> You cannot do that in Java. The only way to get line number is by
> creating a Throwable object and then extracting the stack trace. You
> cannot find the line number at compile time.
>
> Regards,
> KB
>
>
>
>
>
> Charles wrote:
>[color=green]
> >Is there a way to obtain the line number in my code? For example:
> >1 public class MyClass {
> >2 int a = 5;
> >3 System.out.prin tln("Integer variable a was set on line number: " + x);
> >4 etc.
> >Where x is equal to '2'.
> >
> >How can I obtain 'x' ?
> >
> >Thanks.
> >
> >
> >
> >[/color]
>
> --
> ------------------------------------------------------------------------
> This email is certified to be Spam free by Spam Marshall
>
> You don't pay to get spam, why pay to clean it?
> Visit http://www.spammarshall.com to create an account for free
> <http://www.spammarshal l.com>
>
> ------------------------------------------------------------------------
>
>
> --[/color]

You can use java.io.LineNum berReader of LineNumberInput Stream. Both
class has getLineNumber() method.

[Bryce (Work)]

Re: How to get the line number in the code?

On 2 Oct 2003 20:32:13 -0700, HGA03630@nifty. ne.jp (hiwa) wrote:
[color=blue][color=green][color=darkred]
>> >Is there a way to obtain the line number in my code? For example:
>> >1 public class MyClass {
>> >2 int a = 5;
>> >3 System.out.prin tln("Integer variable a was set on line number: " + x);
>> >4 etc.
>> >Where x is equal to '2'.
>> >
>> >How can I obtain 'x' ?[/color][/color]
>
>You can use java.io.LineNum berReader of LineNumberInput Stream. Both
>class has getLineNumber() method.[/color]

Actually, the original poster wanted to do this at runtime. I suppose
you could do some fiddling by reading the .java file into
LineNumberReade r, and locating the code you were executing.

[Charles]

Re: How to get the line number in the code?

Correct, I wish to be able to do this at runtime. I was hoping for a quick
and easy way to do this with minimum overhead.

"Bryce (Work)" <spamtrap@berze rker-soft.com> wrote in message
news:ik0rnv0eq9 orokfhniq29l43q emfirrkta@4ax.c om...[color=blue]
> On 2 Oct 2003 20:32:13 -0700, HGA03630@nifty. ne.jp (hiwa) wrote:
>[color=green][color=darkred]
> >> >Is there a way to obtain the line number in my code? For example:
> >> >1 public class MyClass {
> >> >2 int a = 5;
> >> >3 System.out.prin tln("Integer variable a was set on line number: "[/color][/color][/color]
+ x);[color=blue][color=green][color=darkred]
> >> >4 etc.
> >> >Where x is equal to '2'.
> >> >
> >> >How can I obtain 'x' ?[/color]
> >
> >You can use java.io.LineNum berReader of LineNumberInput Stream. Both
> >class has getLineNumber() method.[/color]
>
> Actually, the original poster wanted to do this at runtime. I suppose
> you could do some fiddling by reading the .java file into
> LineNumberReade r, and locating the code you were executing.[/color]

[Bryce (Work)]

Re: How to get the line number in the code?

On Fri, 3 Oct 2003 11:34:01 -0400, "Charles" <csw@rogers.com > wrote:
[color=blue]
>Correct, I wish to be able to do this at runtime. I was hoping for a quick
>and easy way to do this with minimum overhead.[/color]

Then the answer is no.
[color=blue]
>"Bryce (Work)" <spamtrap@berze rker-soft.com> wrote in message
>news:ik0rnv0eq 9orokfhniq29l43 qemfirrkta@4ax. com...[color=green]
>> On 2 Oct 2003 20:32:13 -0700, HGA03630@nifty. ne.jp (hiwa) wrote:
>>[color=darkred]
>> >> >Is there a way to obtain the line number in my code? For example:
>> >> >1 public class MyClass {
>> >> >2 int a = 5;
>> >> >3 System.out.prin tln("Integer variable a was set on line number: "[/color][/color]
>+ x);[color=green][color=darkred]
>> >> >4 etc.
>> >> >Where x is equal to '2'.
>> >> >
>> >> >How can I obtain 'x' ?
>> >
>> >You can use java.io.LineNum berReader of LineNumberInput Stream. Both
>> >class has getLineNumber() method.[/color]
>>
>> Actually, the original poster wanted to do this at runtime. I suppose
>> you could do some fiddling by reading the .java file into
>> LineNumberReade r, and locating the code you were executing.[/color]
>[/color]

[Raymond DeCampo]

Re: How to get the line number in the code?

Charles wrote:[color=blue]
> Correct, I wish to be able to do this at runtime. I was hoping for a quick
> and easy way to do this with minimum overhead.
>[/color]

[Java purists look away.]
The easiest way would be to use the C precompiler. Or you could even
write your own precompiler (perhaps even in Java, to satisfy the purists).

Ray

[jmgonzal]

Charles wrote:[color=blue]
> Correct, I wish to be able to do this at runtime. I was hoping for a quick
> and easy way to do this with minimum overhead.
>[/color]

[Java purists look away.]
The easiest way would be to use the C precompiler. Or you could even
write your own precompiler (perhaps even in Java, to satisfy the purists).

Ray

------------------
This is the answer for jdk 1.4


String linenumber = new Exception().get StackTrace()[0].getLineNumber( );
System.out.prin tln("The line number is " + linenumber);