To print a line number of the source code in runtime

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Can any one help me in printing the line number of the source code while running the program in java.

eg., in php we can use macro __LINE__ to get the line number of the source code.

Posted 28-Mar-12 23:41pm

Loke.mysore

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TorstenH. 29-Mar-12 5:53am

??? what? Do you have an exception popping up or what?

You can use an IDE, that one will show line numbers if told to do so.

Loke.mysore 29-Mar-12 6:02am

Yes to show a exception with the line number so it can be debug easily

TorstenH. 29-Mar-12 6:39am

both answers are correct and therefor +5 but you are also taking on to a rocket science kind of thing! How about the good old e.printStackTrace() ?

Loke.mysore 29-Mar-12 6:45am

of course solution 1 was correct, Solution 2 helped me more..

TorstenH. 29-Mar-12 9:56am

you can accept both I think.

2 solutions

Solution 1

Refer this link. It has a example source in java for the line number where exception occurs

http://www.dreamincode.net/forums/topic/22661-exception-basics-try-catch-finally/[^]

Posted 29-Mar-12 0:07am

bbirajdar

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Fredrik Bornander · Accepted Answer · 2012-03-29T00:13:00

The the StackTraceElement that you can get out of the exception holds this information, like in this example:

Java

package my.company;

public class Program {


    public void foo(boolean a) throws Exception{
        bar(a);
    }
    
    public void bar(boolean a) throws Exception {
        if (a)
            throw new Exception("I was told to throw!");
    }

    public static void main(String[] args) {
        try {
            Program p = new Program();
            p.foo(true);
        }
        catch(Exception e) {
            System.out.println("Error caught:");
            System.out.println("\t" + e.getMessage());
            System.out.println("\tThrown in file " + e.getStackTrace()[0].getFileName());
            System.out.println("\tThrown on line " + e.getStackTrace()[0].getLineNumber());
        }
        
    }
}

Hope this helps,
Fredrik