Thread.sleep alters the output!

[John Eipe]

Hi,

I have got the below piece of code
When it's run it produces output line by line. I wonder why?

String s = "***Welcome to the MTH junior CAT***";
char[] welcome = s.toCharArray();
      
for(char c:welcome){
try{
            Thread.sleep(5000);
            }catch(Exception e){
            System.out.println(e.getMessage());
    System.out.print(c);
}

[Saifuddin Merchant]

Works perfectly on my computer. Produces the entire message on just a single line!

[David Newton]

What output does it produce?

[Campbell Ritchie]

Read the method you are calling on System.out and see what it does. I shall remind you of the location of its API documentation: here. Look through that API page and you will find other methods; I think one with a rather similar name will help your problem.

[David Newton]

(OT: The program as written doesn't produce any output at all for me. Not sure why it would.)

[Saifuddin Merchant]

David Newton wrote:(OT: The program as written doesn't produce any output at all for me. Not sure why it would.)

Yes right. I think I moved a closing braces (unintentionally).

Even when that mistake is corrected there is no reason why the code should ever produce output on a new line :)

[Saifuddin Merchant]

David Newton wrote:(OT:

Ehh..what does OT stand for?

[David Newton]

Off-Topic

[Campbell Ritchie]

Have I made a mistake and read println() when he said print()? If so, sorry for confusing everybody.

[John Eipe]

Hi Sam,

How did you get it working? I tried it separately in a new class and still no use!

 
public class TestAll {
    public static void main(String[] args){
        String s = "***Welcome to the MTH junior CAT***";
        char[] welcome = s.toCharArray();
      
        for(char c:welcome){
            try{
                Thread.sleep(1000);
                }catch(Exception e){
                    System.out.println(e.getMessage());
                }
            System.out.print(c);
        }    

    }
    
}

Without the sleep method it works fine.

[David Newton]

I don't see how that's possible; are you getting an exception?

[Henry Wong]

Interestingly, John's first code listing, and John's most recent code listing are not the same.

In the first listing, the sysout is in the catch block, and hence, won't print anything unless an exception is thrown. In the most recent listing, it should work.

Henry

[John Eipe]

This is how the output comes:

*
*
*
W
e
l
c
o
m
e

t
o
.
.
. ....

strange
I don't get any exceptions.

[Saifuddin Merchant]

Henry Wong wrote:
Interestingly, John's first code listing, and John's most recent code listing are not the same.

In the first listing, the sysout is in the catch block, and hence, won't print anything unless an exception is thrown. In the most recent listing, it should work.

Henry

Yep I agree. That's all I did. Move the System.out.print(c); outside the catch. As Henry says this code should work fine.
What happens in your case? No output at all? You do need to wait for a couple of seconds before the output starts showing of course!

P:S -> The code you posted works fine. I did try it out once more with no changes at all

[Saifuddin Merchant]

john eipe wrote:This is how the output comes:

*
*
*
W
e
l
c
o
m
e

t
o
.
.
. ....

strange
I don't get any exceptions.

Nopes I get a straight line,
***Welcome to the MTH junior CAT***Press any key to continue . . .

Not sure why you are getting it on a different line .. Beats me!!

[John Eipe]

When I ran this from Command Line it worked!
But when I try this in NetBeans I get the previous output. I tried resizing the Output window et all but to no use.

[John Eipe]

I ran this in Netbeans with 100 millisec sleep time and it works. But if I increase it, gives the old one.

[Saifuddin Merchant]

Yep really strange! Probably something with the ide..Hard to say why though