pl. anyone can provide ans for the following code

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gandhi.pathik@gmail.com - 25 Jan 2006 08:58 GMT

pl. look at the code first

public class Experiment
{
    static
    {
        System.out.println("1");
    }
    //don't touch it
    public static void main(String[] a)
    {
        System.out.println("2");

    }
    //don't touch it
}

In the above code i want to print output as (in order)1,2,3 without
modifying the block which is marked as don't touch it...

can anyone pl. give me suggestion how i can do it?

Regards,
pathik s gandhi

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Francesco Devittori - 25 Jan 2006 09:04 GMT

> pl. look at the code first
>
[quoted text clipped - 20 lines]
> Regards,
> pathik s gandhi

You can add a shutdown hook, i.e. a thread that will be called before
your program ends.

Francesco

public class Experiment
{
     static
     {
         System.out.println("1");
        Thread shutDown = new Thread(new ShutDownThread());
        Runtime.getRuntime().addShutdownHook(shutDown);
     }
     //don't touch it
     public static void main(String[] a)
     {
         System.out.println("2");

     }
     //don't touch it
}

public class ShutDownThread implements Runnable {
     public void run() {
        System.out.println("3");
    }
}

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shruds - 25 Jan 2006 09:06 GMT

try this :
public class Experiment {

    static{
    System.out.println("1");
    }
    public static void main(String[] args) {
        System.out.println("2");
    }
    static{
        main(null);
        System.out.println("3");
        System.exit(0);
    }
}

hope this helps

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gandhi.pathik@gmail.com - 25 Jan 2006 09:15 GMT

thanks a lot this worked

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Chris Uppal - 25 Jan 2006 13:01 GMT

> static{
> main(null);
> System.out.println("3");
> System.exit(0);
> }

Clever.

How about:

===========
import java.io.*;

public class Test
{
static
{
System.setOut(new Hack(System.out));
}

public static void
main(String[] args)
{
System.out.println("2");
}
}

class Hack
extends PrintStream
{
Hack(PrintStream out)
{
super(out);
}

public void
println(String string)
{
boolean hackit = "2".equals(string);
if (hackit) super.println("1");
super.println(string);
if (hackit) super.println("3");
}
}
===========

I think one could find an even more obscure solution by hacking the system
default charset, but I can't be bothered to turn the idea into code.

-- chris

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Marcin Krzysztof Dąbrowski - 25 Jan 2006 09:08 GMT

gandhi.pathik@gmail.com napisał(a):

> public class Experiment
> {
[quoted text clipped - 13 lines]
> In the above code i want to print output as (in order)1,2,3 without
> modifying the block which is marked as don't touch it...

To see 1, 2 execute following code:

new Experiment();
Experiment.main(null);

I don't see where is System.out.println("3");

Regards
Dabek

Reply to this Message

Chris Smith - 25 Jan 2006 09:10 GMT

> pl. look at the code first
>
[quoted text clipped - 12 lines]
> //don't touch it
> }

Looks like some kind of puzzle. I've got a couple good answers, but I
won't give it away to give others a chance to try it.

Where did you get this?

Signature

www.designacourse.com
The Easiest Way To Train Anyone... Anywhere.

Chris Smith - Lead Software Developer/Technical Trainer
MindIQ Corporation

Reply to this Message

Joe Attardi - 25 Jan 2006 16:36 GMT

> Where did you get this?

Perhaps from his homework assignment? :-)

Reply to this Message

Chris Uppal - 25 Jan 2006 16:48 GMT

> Perhaps from his homework assignment? :-)

If it is, and he's handed in any of the actual code that's been shown so far,
then he's in deep sh.t ;-)

-- chris

Reply to this Message

Thomas Hawtin - 25 Jan 2006 18:05 GMT

My preferred solution:

> public class Experiment
> {
[quoted text clipped - 9 lines]
> }
> //don't touch it

static Experiment System;
static Experiment out;

static void println(String text) {
java.lang.System.out.println("1\n2\n3");
}

> }
>
> In the above code i want to print output as (in order)1,2,3 without
> modifying the block which is marked as don't touch it...

http://jroller.com/page/tackline?entry=let_s_start_with_a

Tom Hawtin

Signature

Unemployed English Java programmer
http://jroller.com/page/tackline/

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Chris Uppal - 25 Jan 2006 18:28 GMT

> static void println(String text) {
> java.lang.System.out.println("1\n2\n3");
> }

Tut tut! Platform dependent line delimiters...

-- chris

Reply to this Message

Thomas Hawtin - 25 Jan 2006 20:49 GMT

>> static void println(String text) {
>> java.lang.System.out.println("1\n2\n3");
>> }
>
> Tut tut! Platform dependent line delimiters...

Yup. Me forgetting the mind bogglingness of PrintStream. It'll
auto-flush (it does not appear documented whether System.out has
auto-flushing enabled) on the new line character (and undocumented
places besides), but that doesn't mean it'll be treated as a line separator.

Tom Hawtin

Signature

Unemployed English Java programmer
http://jroller.com/page/tackline/

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Francesco Devittori - 26 Jan 2006 07:37 GMT

Thomas Hawtin wrote:

> gandhi.pathik@gmail.com wrote:
>
[quoted text clipped - 28 lines]
>
> Tom Hawtin

Now that's a nice solution!

Francesco

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Vova Reznik - 26 Jan 2006 21:55 GMT

> pl. look at the code first
>
> public class Experiment
> {
> static
> {

System.setOut(new MyPrinter(System.out));

>         System.out.println("1");
>     }
[quoted text clipped - 6 lines]
>     //don't touch it
> }

static class MyPrinter extends PrintStream{
        private static boolean printed = false;

        public MyPrinter(OutputStream out) {
            super(out);
        }

        public void println(String str){
            if(!printed){
                printed = true;
                super.println("1");
                super.println("2");
                super.println("3");
            }
        }
    }

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pl. anyone can provide ans for the following code

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