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. 7 25970
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: 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.
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Kathy Benson <fo***********@ yahoo.com> wrote in message news:<3F******* *****@yahoo.com >... 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:
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.
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You can use java.io.LineNum berReader of LineNumberInput Stream. Both
class has getLineNumber() method.
On 2 Oct 2003 20:32:13 -0700, HG******@nifty. ne.jp (hiwa) wrote: >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' ?
You can use java.io.LineNum berReader of LineNumberInput Stream. Both class has getLineNumber() method.
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.
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)" <sp******@berze rker-soft.com> wrote in message
news:ik******** *************** *********@4ax.c om... On 2 Oct 2003 20:32:13 -0700, HG******@nifty. ne.jp (hiwa) wrote:
>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' ?
You can use java.io.LineNum berReader of LineNumberInput Stream. Both class has getLineNumber() method.
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.
On Fri, 3 Oct 2003 11:34:01 -0400, "Charles" <cs*@rogers.com > wrote: 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.
Then the answer is no.
"Bryce (Work)" <sp******@berze rker-soft.com> wrote in message news:ik******* *************** **********@4ax. com... On 2 Oct 2003 20:32:13 -0700, HG******@nifty. ne.jp (hiwa) wrote:
>> >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' ? > >You can use java.io.LineNum berReader of LineNumberInput Stream. Both >class has getLineNumber() method.
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 wrote: 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.
[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
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);
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--
-----------------------------------
Ken Varn
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varnk@diebold.com
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