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Java Forum / General / October 2007split query
I know that the split method is used to produce an array of strings separated by the argument. I'm confused about the split string method in the following cases. String test = "ABC"; String[] arr = test.split(","); What's the value of arr? Is it null or it has arr[0] with the value of "ABC"? String test2 = ""; String[] arr2 = test2.split(","); What's the value of arr2? Is it null or it has arr[0] with the value of ""? >I know that the split method is used to produce an array of strings >separated by the argument. > >I'm confused about the split string method in the following cases. Somebody posting to c.l.j.p. would normally be expected to have enough nouse to write a short test program that could answer the very questions you ask. Why not try that?  SignatureAndrew Thompson http://www.athompson.info/andrew/ > ... a short test program that could > answer the very questions you ask. > > Why not try that? One of the benefits of writing and deploying an SSCCE <http://www.physci.org/codes/sscce.html> is that it very often answers the question for you. SignatureLew >> ... a short test program that could >> answer the very questions you ask. [quoted text clipped - 4 lines] ><http://www.physci.org/codes/sscce.html> >is that it very often answers the question for you. An excellent point. SignatureAndrew Thompson http://www.athompson.info/andrew/ > have enough nouse "nous" (or "νους"). Greek word. SignatureJohn W. Kennedy "But now is a new thing which is very old-- that the rich make themselves richer and not poorer, which is the true Gospel, for the poor's sake." -- Charles Williams. "Judgement at Chelmsford" > > have enough nouse > > "nous" (or " "). Greek word. Oops! My bad. Bad enough that I am using obscure words, worse that they are neither English*, nor correctly spelt! Since the definitions point out that the word 'nous' has many different meanings, I will clarify that I actually meant 'common sense'. * If only for the reason that people might be expecting 'English' here. Andrew T. > Since the definitions point out that the word > 'nous' has many different meanings, I will > clarify that I actually meant 'common sense'. If you don't get /nous/ into your head, you might get your head into a noose. SignatureLew >>> have enough nouse >> "nous" (or " "). Greek word. [quoted text clipped - 9 lines] > * If only for the reason that people might be > expecting 'English' here. The sense you meant is sufficiently known (as a British slang expression) to be in larger dictionaries, and I, though an 'umble Yank, already knew it from somewhere or other. SignatureJohn W. Kennedy "You can, if you wish, class all science-fiction together; but it is about as perceptive as classing the works of Ballantyne, Conrad and W. W. Jacobs together as the 'sea-story' and then criticizing _that_." -- C. S. Lewis. "An Experiment in Criticism" >>>> have enough nouse >>> "nous" (or " "). Greek word. [quoted text clipped - 13 lines] > expression) to be in larger dictionaries, and I, though an 'umble Yank, > already knew it from somewhere or other. Yeah, but you're into reading lit., so you have a wider experience than the average American. (Doesn't Yank mean something else in British en_UK?) From context, I simply took it as a word I didn't understand that meant something that someone *should* have. Being clarified as common sense, it turns out I was right. SignatureDaniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/> >I'm confused about the split string method in the following cases. > >String test = "ABC"; >String[] arr = test.split(","); The usual problem people have with split in this: The split argument is NOT a simple String, but rather a regex expression. $ ( ) * + - . < = ? [ \ ] ^ { | } characters have magic meaning. They need to be quoted when you mean them literally. See http://mindprod.com/jgloss/regex.html#QUOTING This baffles people. However, your question >String test = "ABC"; >String[] arr = test.split(","); >What's the value of arr? Is it null or it has arr[0] with the value of >"ABC"? Should be solved easily with a simple experiment. It baffles me when people ask questions like yours. It would be less work, less typing and much faster to do the experiment than to post a question. I wonder what inhibits people from experimenting. 1. too many Star Trek episodes where computers explode given the "wrong" inputs. 2. punishment as a child for asking questions. 3. punishment as a child for curiosity. 4. lack of confidence in your ability to perform experiments or lack of confidence in the generality of experimental results. You prefer the authority of another human. I recall teaching a computer course to some women reentering the work force as part of a government program. I asked them to pound some random keys to prove to themselves the computer would not explode. I meant this as a joke, and to ease the fear of making mistakes. One woman asked "Which key should I hit". I said, "Any you like.. Close your eyes. Just hit any keys you like." She burst into tears. She then reported me for abusing her by giving her inadequate direction on what to do. She was an extreme example of someone afraid to experiment, someone terrified of making a mistake or doing something without explicit permission. At the opposite end are kids who are itching to press every button to see if they can figure out what it does. The kindest thing a parent can do is avoid squashing his children's curiosity. That was one thing my parents did well. "The reason is, that I'm doubtful about the temper of your flamingo. Shall I try the experiment?'" ~ The Dutchess, Alice In Wonderland. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com >> I'm confused about the split string method in the following cases. >> [quoted text clipped - 25 lines] > 1. too many Star Trek episodes where computers explode given the > "wrong" inputs. Hah, hadn't considered that. > 2. punishment as a child for asking questions. > > 3. punishment as a child for curiosity. me thinks 2 and 3 amount to the same thing. > 4. lack of confidence in your ability to perform experiments or lack > of confidence in the generality of experimental results. You prefer > the authority of another human. I'm mostly self taught. I always experimented with everything, except when I *first* started learning about multithreaded programming. I had heard so many people say that its so difficult to get right, and that the code could appear to work, but not be "correct". This put me off of the subject for a while until I realized that there was a finite (actually small) set of rules which you could reason with. This gave me the ability to "mentally" experiment with such scenarios. Experimentation is definitely an invaluable process. > I recall teaching a computer course to some women reentering the work > force as part of a government program. I asked them to pound some [quoted text clipped - 6 lines] > She burst into tears. She then reported me for abusing her by giving > her inadequate direction on what to do. This sounds like an exaggeration, but I believe it. Many of my past students have known the solution to a problem, but wouldn't attempt it until I told them it was correct. If someone has to tell you that you're correct, then you'll never produce anything original. > She was an extreme example of someone afraid to experiment, someone > terrified of making a mistake or doing something without explicit [quoted text clipped - 5 lines] > The kindest thing a parent can do is avoid squashing his children's > curiosity. That was one thing my parents did well. Agreed, There is a fine line between protecting the wellbeing of your children and possessions, and causing harm in the form of fear of experimenting. SignatureDaniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/> On Fri, 26 Oct 2007 12:03:22 -0700, Daniel Pitts <newsgroup.spamfilter@virtualinfinity.net> wrote, quoted or indirectly quoted someone who said : >> 2. punishment as a child for asking questions. >> >> 3. punishment as a child for curiosity. >me thinks 2 and 3 amount to the same thing. Curiosity would include taking things apart, poking around in parent's belongings, attempting to use tools, wandering off to explore, wanting to take large amounts of time to study interesting phenomena, interest in things parents consider morbid like insects, road kill, books of tropical diseases ... Asking questions can sometimes just be a way to pass time. The answers are not important. It is just something to do with a parent. I can remember asking questions I already knew the answers to when I ran out of new ones. It was almost like asking for a familiar bedtime story. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com On Fri, 26 Oct 2007 12:03:22 -0700, Daniel Pitts <newsgroup.spamfilter@virtualinfinity.net> wrote, quoted or indirectly quoted someone who said : >This sounds like an exaggeration, but I believe it. Strangely it is not. What is odd is the other women in the class chastised me as well. I was dumbfounded. Their point was I should have noticed how stressful this was for her and backed off, and that I should apologise for giving her an impossible ill-defined task. I gave her no algorithm to decide which key to kit. Her reluctance for me made no sense. It was not as though I was asking her to jump out of a plane. I had taught university level and children before, but never a group such as this. It was completely different. I talked about this with various people trying to understand what was happening. One person said, that older adults are extremely afraid of making a mistake, especially a public mistake.. They would find it humiliating. (I had noticed teaching university students a few would refuse to work at the black board.) They want to know exactly what to do. They want assurance the odds of making a mistake are extremely low. It seems to me, you can't learn anything in computers until you are willing to make hundreds of mistakes. You have to keep trying thing after thing until you find something that works. If you punish yourself for failing to guess the right answer the first time, you will become paralysed and incapable of solving any but the simplest problems. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com ... > It seems to me, you can't learn anything in computers until you are > willing to make hundreds of mistakes. You have to keep trying thing > after thing until you find something that works. If you punish > yourself for failing to guess the right answer the first time, you > will become paralysed and incapable of solving any but the simplest > problems. ... I would delete "in computers" from the first sentence of this paragraph. Learning almost any skill involves trying to exercise the skill before you have acquired it. Patricia > On Fri, 26 Oct 2007 12:03:22 -0700, Daniel Pitts > <newsgroup.spamfilter@virtualinfinity.net> wrote, quoted or indirectly [quoted text clipped - 27 lines] > will become paralysed and incapable of solving any but the simplest > problems. Man, I would have apologized. I'm sorry you're too stupid to learn computers. Just kidding. Although, my with my personality I would have apologized, not for my methodology, but because I didn't notice/realize the distress I was causing. I can see how most people in your situation wouldn't apologize. I don't think you're wrong. I also agree that the fear of mistakes is debilitating to would-be students. Even I fall prey to that fear at times. As soon as I get over it, I tend to do better than many of my peers. SignatureDaniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/> On Fri, 26 Oct 2007 12:03:22 -0700, Daniel Pitts <newsgroup.spamfilter@virtualinfinity.net> wrote, quoted or indirectly quoted someone who said : >This sounds like an exaggeration, but I believe it. The fact I left out was these women had been out of the work force for a very long time, and were having minor psychological problems reintegrating. They were a very timid group, possibly abuse survivors. My course was supposed to give them a gentle, low-pressure introduction to computers. I was known for teaching in a light humorous way. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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