How to remove all white spaces in java

Question

I have a programming assignment and part of it requires me to make code that reads a line from the user and removes all the white space within that line   the line can consist of one word or more       What I was trying to do with this program is have it analyze each character until it finds a space and then save that substring as the first token  then loop again until it reaches no more tokens or the end of the line    I keep on getting this when I try to compile it   Exception in thread  main  java lang StringIndexOutOfBoundsException  String index   out of range  1     at java lang String charAt String java 694      at trim main trim java 23    Here is the code   import java util Scanner   import java lang Character  import java lang String   public class trim           public static void main  String  args                     String a            String b            String c           char aChar           int i   0            Scanner scan   new Scanner System in            a   scan nextLine            a  a trim                for     i  gt   0   i                           aChar   a charAt i               if  aChar    32                           a   a substring 0 i 1                           else                          b   a substring i 160                b  b trim                c   c   a               c   c trim                 a   b               i   0                           if  b equals null                            i   -1                                         easier ways to do this is appreciated  but I still want to get this program working   and I can t use sentinels in the input     Thanks everybody for all the help    I will use the simpler method   and will read the javadoc

User · Answer

package com infy test   import java util Scanner   import java lang String    public class Test1         public static void main  String  args                 String a   null            Scanner scan   new Scanner System in           System out println           White Space Remover Program             n            System out println  Enter your string n        a   scan nextLine            System out println  Input String is    n  a             String b  a replaceAll    s                 System out println   nOutput String is    n  b

User · Answer

trim java 30  cannot find symbol symbol    method substr int int  location  class java lang String b   a substr i 160      There is no method like substr in String class   use String substring   method

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Why not use a regex for this   a   a replaceAll    s         In the context of a regex   s will remove anything that is a space character  including space  tab characters etc    You need to escape the backslash in Java so the regex turns into   s   Also  since Strings are immutable it is important that you assign the return value of the regex to a

User · Answer

Cant you just use String replace

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Replace all the spaces in the String with empty character   String lineWithoutSpaces   line replaceAll    s

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The most intuitive way of doing this without using literals or regular expressions   yourString replaceAll

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You can use a regular expression to delete white spaces   try that snippet   Scanner scan   new Scanner System in       System out println scan nextLine   replaceAll

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String a  string with                multi spaces     String b  a replace             replace            replace           replace            replace                it work fine with any spaces

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Try this   String str    Your string with     spaces   str   str replace

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String a  string with                multi spaces      or this  String b  a replaceAll    s          String c  a replace             replace            replace           replace            replace                it work fine with any spaces   don t forget space in sting b

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Try     string output   YourString replaceAll    s        s - indicates space character  tab characters etc

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java lang String class has method substring not substr   thats the error in your program   Moreover you can do this in one single line if you are ok in using regular expression   a replaceAll    s

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boolean flag   true  while flag        s   s replaceAll               if   s contains               flag   false    return s

User · Answer

public static String removeSpace String s        String withoutspaces           for  int i   0  i  lt  s length    i              if  s charAt i                      withoutspaces    s charAt i              return withoutspaces       This is the easiest and most straight forward method to remove spaces from a String

[java] How to remove all white spaces in java

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