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the if loop

Chris Lenney
Greenhorn

Joined: Mar 01, 2006
Posts: 5
I have 2D array called grid which in column [0] has string in the format 01/03/2003, I don't want to deal with date formats as im only concentrated on the year, therefore i use substring and compare it to the year in question (as seen below).

My question is, how come the if statement only seems to iterate once? It should iterate a fair few times as the first 30 dates are "2003".

if (grid[row][0].substring(6,10).equals("2003")) {
out03.write(grid[row][1] + "\n");
System.out.println(row + "\n");
row ++;
}

Thanks, Chris
Kail Limas
Greenhorn

Joined: Jul 09, 2007
Posts: 24
There is a loop surrounding the if statement right?

Without a loop like for or while the if statement is only used once.
Peter Chase
Ranch Hand

Joined: Oct 30, 2001
Posts: 1970
If you (original poster) were expecting your posted code to iterate through a loop, I am interested to know from which other programming language you have come to Java. Something rather different, I guess!


Betty Rubble? Well, I would go with Betty... but I'd be thinking of Wilma.
Chris Lenney
Greenhorn

Joined: Mar 01, 2006
Posts: 5
lol no, java is my first language, im just a bit slow. Thanks for your help, i'll put it inside another loop. Cheers
Francesco Bianchi
Ranch Hand

Joined: Jun 22, 2007
Posts: 62
Two little hints:
1. About code readability and code reuse: use endsWith() instead of substring() followd by an equals()
2. About code reliability: what happens if for some reason you call the substring on a String which is long...let's say...4 chars?


SCJP 5 & 6, SCWCD 5, SCBCD 5
fred rosenberger
lowercase baba
Bartender

Joined: Oct 02, 2003
Posts: 11308
    
  16

Just to be sure we are clear... there is no such thing as an "if loop". the if is a conditional. IF something is true, do what's in the block. it is designed to only fire once.

if you want a loop, you need a for, a for-each, a while, or a do-while loop.


There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors
 
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subject: the if loop