[Bluej-discuss] Ex 9.7

[John Simonds]

 Thank you, I discovered this already, shortly after I sent the message, I remembered there was a difference between print and println
one generating a new line and one not. 




John Simonds
Systems Technologist
simonj2 at sage.edu
(518)244-3111
(518)292-1734

 
 
 
--------------------------------------- 
Original E-mail 
From: Colleen Penrowley  
Sent: 11/12/2006 02:22 PM  
To: General discussion for users of BlueJ  
Subject: Re: [Bluej-discuss] Ex 9.7 
 
John, 
 
Try: 
System.out.print(" CD:  "  + artist) ; 
 
Colleen 
 
 
At 11:55 AM 11/12/2006 -0500, John Simonds wrote: 
>  Thank you for your prompt reply.  My question was a bit more specific  
> than that.  I unsderstand that when printing from CD, for instance that  
> the print method will execute CD's print method and wherever  
> super.print();  is placed, Items print method's will execute in the order  
> they are placed.  My question is that in the book, question 9.7 wants you  
> to print 
> 
> 
>CD:  Frank  Sinatra:  A Swingin'  Affair  * 
> 
>64 minutes 
> 
>my favorite Sinatra album 
> 
>tracks: 16 
> 
>Now, the code I have in Item, looks like this: 
> 
>public void print( ) 
>{ 
>     System.out.print(title + " ( " + playingTime + minutes)"); 
>     if (got It)   { 
>       System.out.println(" * "); 
>       }  else { 
>             System.out.println( ) ; 
>      } 
>      System.out.println("  "  + comment); 
> 
>   } 
> 
>} 
> 
>The CD class has this print method: 
> 
>public void print( ) 
>{ 
>     System.out.println(" CD:  "  + artist) ; 
>     super.print( ) ; 
>     System.out.println("   tracks:  + numberOfTracks); 
> 
>} 
> 
>What I get looks like this: 
> 
>CD : Frank Sinatra 
>A Swingin' Affair (64 minutes)* 
>great album 
>tracks 16 
> 
> 
>I can't seem to get CD: Frank Sinatra A Swingin' Affair (64 minutes)*  all  
>on the same line, which is what the exercise calls for. 
> 
> 
>John Simonds 
>Systems Technologist 
>simonj2 at sage.edu 
>(518)244-3111 
>(518)292-1734 
> 
> 
> 
> 
>--------------------------------------- 
>Original E-mail 
>From: Davin McCall 
>Sent: 11/12/2006 02:19 AM 
>To: John Simonds , General discussion for users of BlueJ 
>Subject: Re: [Bluej-discuss] Ex 9.7 
> 
>Hi John, 
> 
>I don't happen to have a copy of the book handy at the moment, but: 
> 
>What determines "what prints where" is simply a matter of the order in  
>which things print - and that is the same order as the relevant print  
>statements in your code are executed. This order is of course determined  
>solely by the structure of your program. Understanding how the structure  
>and the execution order are related is critical to understanding how to  
>program. 
> 
>I suggest you need to look at your program and - in your head - follow the  
>execution path to see when each statement will be executed. Then you  
>should be able to see why some things are printed before others, and  
>hopefully also where you need to put your own print statements to get the  
>desired behaviour. 
> 
>If this is too difficult (the execution path may be very complex) you can  
>use the debugger to step through your program's execution line by line.  
>You just need to set a breakpoint at the beginning of the method you are  
>going to call interactively, then call the method. Use the "Step" or "Step  
>into" buttons in the debugger window to see how your program runs ("Step"  
>will step over method calls, so I recommend using "Step into" unless the  
>call is trivial and you already understand what it does). 
> 
>There should be more information on how to use the debugger in the  
>tutorial, or at least in the reference manual, which you can download from  
>the web site. 
> 
>I hope this is helpful & I apologise if I have oversimplified due to  
>misunderstanding your question, 
> 
>Davin 
> 
> 
> 
>On Sat, 11 Nov 2006 20:04:19 -0500 (EST) 
>John Simonds wrote: 
> 
> > I am having a problem with Ex 9.7 and the problem is, I don't know how  
> to get it to print in a specific order. 
> > I did the super.print(); method.  I discovered that, depending on where  
> that is placed in one of the other classes, things print out differently,  
> put I don't know how to get contol over what prints where. 
> > 
> > 
> > John Simonds 
> > Systems Technologist 
> > simonj2 at sage.edu 
> > (518)244-3111 
> > (518)292-1734 
> > 
> > 
> > 
> > 
> > 
> > 
> 
> 
> 
> 
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