 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Java Forum / General / April 2007String[] to String
/* I am writing this class to see the output of: args.toString(); I want to see if the toString() method on the String[] will convert the array contents into one string or it will write out it's type name, i.e. the <code>Class</code> class' name. As observed, the output is [java.lang.String@1693e2; which looks like the array's underlying type's name and the starting memory address. */ public class Ats /*implying Array To String */ { public static void main(String[] args) { if ( args.length == 0 ) System.out.println("Usage: ats arg1 [arg2 [arg3...]]"); else System.out.println(args.toString()); } } *RESOLVED* I am using jsdk 1.4.2, in which there is no method to convert an array to a string. We have to do it manually. >From v1.5.x onwards, there is a toString() override in java.utils.Arrays class that does it. http://java.sun.com/j2se/1.5.0/docs/api/java/util/Arrays.html#toString(java.lang .Object[]) It is amazing that java.lang.String class has a split method but no reverse mechanism for joining, like the "join" method some languages such as VB/VB.NET and the .NET framework support. http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html#split(java.lang.String) Hi! :-) My question was if there was a way to convert a String[] to a String. I wa writing small programs to try these basic things out and documenting them also for other users' benfit and for my own record sake. When I document things I am learning, I am able to retain them for longer and revisit them as and when I forget them. :-) Hope you are not angry about it? :-) > Hi! :-) > [quoted text clipped - 9 lines] > > Hope you are not angry about it? :-) I'm not angry about it. Sometimes we have people posting who have difficulty expressing themselves in English. They might make a post, and then wait a couple of days, before wondering why no one is answering their question, not realizing that nobody sees a question in the post that they made. So I was checking if you had a question or not. - Oliver > Hi! :-) > [quoted text clipped - 9 lines] > > Hope you are not angry about it? :-) Eh . . . I hope you are not planning on making comp.lang.java.programmer your notepad. hehe. Remember this is a discussion forum - if you want to make a collaboration of notes and hints you can make a website or blogsite for that. If you do want to post a tip or a hint, please indicate so in the subject line so it does not appear to be a question for those people who do not want to read it :) Take care! See ya! -- LTP :) > Remember this is a discussion forum - if you want to make a collaboration of > notes and hints you can make a website or blogsite for that. How is it that collaborations of notes and hints are not considered discussions?  SignatureLew >> Remember this is a discussion forum - if you want to make a collaboration >> of notes and hints you can make a website or blogsite for that. > > How is it that collaborations of notes and hints are not considered > discussions? It is my opinion that he should not post closed ended "hints" that out of context are not particularly useful. This is only my opinion - if you hadn't snipped my last paragraph you would see I did not tell him to not post tips. The problem with "beginners tips" is that beginners are not going to know what they are missing - and hence will not proactively seek it out. Posting a solution to a unique or interesting problem doesn't bother me. Four replies to yourself about all the trials and efforts of concatenating the strings in an array does not qualify in my book. I'm not opposed to tips - but it sounded like he wanted to use the NG as scratch paper which was in line with what I was seeing. -- LTP :) > It is amazing that java.lang.String class has a split method but no > reverse mechanism for joining, like the "join" method some languages > such as VB/VB.NET and the .NET framework support. > > http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html#split(java.lang.String) See java.util.Arrays.toString() and .deepToString() - Oliver >> http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html#split(java.lang.String) > > See java.util.Arrays.toString() and .deepToString() You get a load of unwanted characters in your string if you do that. I think you are still left with writing a little concatenation loop. Tom Hawtin > It is amazing that java.lang.String class has a split method but no > reverse mechanism for joining, like the "join" method some languages > such as VB/VB.NET and the .NET framework support. > > http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html#split(java.lang.String) What in the world are you talking about? Of course it does, and it's way older than the split() method! String [] a = some.split( regex ); String join = ""; for ( String s : a ) { join = join + s; } SignatureLew På Thu, 05 Apr 2007 23:46:21 +0200, skrev Lew <lew@nospam.lewscanon.com>: > String join = ""; > for ( String s : a ) > { > join = join + s; > } Oh, evil! Use a StringBuffer or StringBuilder, otherwise you create and discard a ton of String/StringBuffer objects in the loop. > På Thu, 05 Apr 2007 23:46:21 +0200, skrev Lew <lew@nospam.lewscanon.com>: > [quoted text clipped - 6 lines] > Oh, evil! Use a StringBuffer or StringBuilder, otherwise you create and > discard a ton of String/StringBuffer objects in the loop. I forget the original context for that, whether it was intentionally Evil or used to show the use of the '+' operator for Strings. Yes, very Evil! SignatureLew >>From v1.5.x onwards, there is a toString() override in > java.utils.Arrays class that does it. > > http://java.sun.com/j2se/1.5.0/docs/api/java/util/Arrays.html#toString(java.lang .Object[]) That is not an override. SignatureLew > /* I am writing this class to see the output of: > [quoted text clipped - 22 lines] > } > } Right. Did you have a question or concern, or were you just sharing the results of your experiment with the group? - Oliver > /* I am writing this class to see the output of: > [quoted text clipped - 25 lines] > > - Show quoted text - For the record, don't use "Ats" as the class name and then comment it saying, "It means Array to String." Just name the class ArrayToString. Variable names should mean something. >> /* I am writing this class to see the output of: >> [quoted text clipped - 29 lines] > saying, "It means Array to String." Just name the class > ArrayToString. Variable names should mean something. Or even better, ArrayToStringConverter or ArrayUtilities or something. It's usually good to have a descriptive noun in a class name (e.g. SomethingConverter, BlingConnector, AnimalWalker, etc.) lex 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 ...
|
Reply to this Message
|
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.