Take a char input from the Scanner

Question

I am trying to find a way to take a char input from the keyboard   I tried using   Scanner reader   new Scanner System in   char c   reader nextChar      This method doesn t exist   I tried taking c as a String  Yet  it would not always work in every case  since the other method I am calling from my method requires a char as an input  Therefore I have to find a way to explicitly take a char as an input   Any help

User · Answer

The easiest way is  first change the variable to a String and accept the input as a string   Then you can control based on the input variable with an if-else or switch statement as follows   Scanner reader   new Scanner System in    String c   reader nextLine    switch  c        case  a            lt your code here gt          break      case  b            lt your code here gt          break      default            lt your code here gt

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Simple solution to read a charachter from user input  Read a String  Then use charAt 0  over String Scanner reader   new Scanner System in   String str   reader next    char c   str charAt 0    That s it

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Use a BufferedReader to read characters from the console  import java io    class BRRead   public static void main String args    throws IOException   char c  BufferedReader br   new BufferedReader new InputStreamReader System in    System out println  Enter characters   q  to quit        read characters do   c    char  br read    System out println c     while c     q

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Just use    Scanner keyboard   new Scanner System in   char c   keyboard next   charAt 0    This gets the first character of the next input

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You should use your custom input reader for faster results instead of extracting first character from reading String   Link for Custom ScanReader and explanation  https   gist github com nik1010 5a90fa43399c539bb817069a14c3c5a8  Code for scanning Char     BufferedInputStream br new BufferedInputStream System in   char a   char br read

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To find the index of a character in a given sting  you can use this code   package stringmethodindexof   import java util Scanner  import javax swing JOptionPane              author ASUS  VERY VERY IMPORTANT     public class StringMethodIndexOf                    param args the command line arguments             public static void main String   args               TODO code application logic here         String email          String any            char any     any JOptionPane showInputDialog null  Enter any character or string to find out its INDEX NUMBER   charAt 0            THE AVOBE LINE IS FOR CHARACTER INPUT LOL   System out println  Enter any character or string to find out its INDEX NUMBER             Scanner r new Scanner System in            any r nextChar            email   JOptionPane showInputDialog null  Enter any string or anything you want              any JOptionPane showInputDialog null  Enter any character or string to find out its INDEX NUMBER            int result          result email indexOf any           JOptionPane showMessageDialog null  result

User · Answer

This actually doesn t work   char c   reader next   charAt 0     There are some good explanations and references in this question  Why doesn  39 t the Scanner class have a nextChar method   A Scanner breaks its input into tokens using a delimiter pattern   which is pretty open ended  For example when using this  c   lineScanner next   charAt 0     for this line of input    1   9     3 - 1    6 - 2  the call to next returns   1   c will be set to      and you ll end up losing the  1  on the next call to next    Typically when you want to get a character you would like to ignore whitespace   This worked for me   c   lineScanner findInLine      s    charAt 0     Reference  regex to match a single character that is anything but a space

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Try this  char c S nextLine   charAt 0

User · Answer

Try this  Scanner scanner new Scanner System in   String s scanner next    char c s charAt 0

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There are two approaches  you can either take exactly one character or strictly one character   When you use exactly  the reader will take only the first character  irrespective of how many characters you input    For example   import java util Scanner     public class ReaderExample          public static void main String   args               try              Scanner reader   new Scanner System in            char c   reader findInLine      charAt 0                reader close                   System out print c              catch  Exception ex                   System out println ex getMessage                                    When you give a set of characters as input  say  abcd   the reader will consider only the first character i e   the letter  a   But when you use strictly  the input should be just one character  If the input is more than one character  then the reader will not take the input  import java util Scanner     public class ReaderExample          public static void main String   args               try              Scanner reader   new Scanner System in            char c   reader next      charAt 0                reader close                   System out print c              catch  Exception ex                   System out println ex getMessage                                    Suppose you give input  abcd   no input is taken  and the variable c will have Null value

User · Answer

You could use typecasting   Scanner sc  new Scanner System in   char a  char  sc next      This way you will take input in String due to the function  next    but then it will be converted into character due to the  char  mentioned in the brackets   This method of conversion of data type  by mentioning the destination data type in brackets is called typecating  It works for me  I hope it works for u

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import java util Scanner   public class userInput      public static void main String   args              Creating your scanner with name kb as for keyBoard         Scanner kb   new Scanner System in            String name          int age          char bloodGroup          float height              Accepting Inputs from user         System out println  Enter Your Name            name   kb nextLine       for entire line of String including spaces         System out println  Enter Your Age            age   kb nextInt       for taking Int         System out println  Enter Your BloodGroup   A B O only            bloodGroup    kb next   charAt 0      For character at position 0         System out println  Enter Your Height in Meters            height   kb nextFloat       for taking Float value             closing your scanner object         kb close                Outputting All         System out println  Name      name           System out println  Age      age           System out println  BloodGroup      bloodGroup           System out println  Height      height   m

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import java util Scanner   public class Test        public static void main String   args              Scanner reader   new Scanner System in           char c   reader next  quot   quot   charAt 0             To get only one character char c   reader next  quot   quot   charAt 0

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You could take the first character from Scanner next   char c   reader next   charAt 0     To consume exactly one character you could use   char c   reader findInLine      charAt 0     To consume strictly one character you could use   char c   reader next      charAt 0

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Setup scanner   reader useDelimiter        After this reader next   will return a single-character string

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import java io     class abc    enter class name  here abc is class name        public static void main String arg        throws IOException    can also use Exception               BufferedReader z               new BufferedReader new InputStreamReader System in             char ch    char  z read             PSVM      class

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You should get the String using scanner next   and invoke String charAt 0  method on the returned String  Exmple         import java util Scanner       public class InputC                public static void main String   args                       TODO Auto-generated method stub                       Declare the object and initialize with                       predefined standard input object                     Scanner scanner   new Scanner System in                       System out println  Enter a character                             Character input                     char c   scanner next   charAt 0                          Print the read value                     System out println  You have entered    c                               output   Enter a character   a You have entered  a

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There are three ways to approach this problem    Call next   on the Scanner  and extract the first character of the String   e g  charAt 0    If you want to read the rest of the line as characters  iterate over the remaining characters in the String   Other answers have this code  Use setDelimiter     to set the delimiter to an empty string   This will cause next   to tokenize into strings that are exactly one character long   So then you can repeatedly call next   charAt 0  to iterate the characters   You can then set the delimiter to its original value and resume scanning in the normal way  Use the Reader API instead of the Scanner API   The Reader read   method delivers a single character read from the input stream   For example   Reader reader   new InputStreamReader System in   int ch   reader read    if  ch    -1        check for EOF        we have a character            When you read from the console via System in  the input is typically buffered by the operating system  and only  released  to the application when the user types ENTER   So if you intend your application to respond to individual keyboard strokes  this is not going to work   You would need to do some OS-specific native code stuff to turn off or work around line-buffering for console at the OS level   Reference    How to read a single char from the console in Java  as the user types it

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you just need to write this for getting value in char type    char c   reader next   charAt 0

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You can solve this problem  of  grabbing keyboard input one char at a time  very simply  Without having to use a Scanner all and also not clearing the input buffer as a side effect  by using this    char c    char System in read      If all you need is the same functionality as the C language  getChar    function then this will work great  The Big advantage of the  System in read    is the buffer is not cleared out after each char your grab  So if you still need all the users input you can still get the rest of it from the input buffer  The  char c   scanner next   charAt 0    way does grab the char but will clear the buffer       Java program to read character without using Scanner public class Main       public static void main String   args                try               String input                      Grab the First char  also wait for user input if the buffer is empty                 Think of it as working just like getChar   does in C              char c    char System in read                while c      n                        lt do your magic you need to do with the char here gt                  input    c      lt my simple magic gt                     then grab the next char                 c    char System in read                                print back out all the users input             System out println input             catch  Exception e               System out println e                         Hope this helpful  and good luck  P S  Sorry i know this is an older post  but i hope that my answer bring new insight and could might help other people who also have this problem

User · Answer

The best way to take input of a character in Scanner class is   Scanner sca new Scanner System in   System out println  enter a character    char ch sca next   charAt 0

User · Answer

There is no API method to get a character from the Scanner  You should get the String using scanner next   and invoke String charAt 0  method on the returned String   Scanner reader   new Scanner System in   char c   reader next   charAt 0     Just to be safe with whitespaces you could also first call trim   on the string to remove any whitespaces   Scanner reader   new Scanner System in   char c   reader next   trim   charAt 0

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Scanner key   new Scanner System in     shortcut way  char firstChar key next   charAt 0       how it works    key next   takes a String as input then  charAt method is applied on that input  String  with a parameter of type int  position  that you give to get       that char at that position  You can simply read it out as   the char at position index 0 from the input String  through the Scanner object key  is stored in var  firstChar  type char        you can also do it in a bit elabortive manner to understand how it exactly works String input key next        you can also write key nextLine to take a String with spaces also char firstChar input charAt 0   char charAtAnyPos  input charAt pos       in pos you enter that index from where you want to get the char from   By the way  you can t take a char directly as an input  As you can see above  a String is first taken then the charAt 0   is found and stored

[java] Take a char input from the Scanner

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