Reading a single char in Java

Question

How can a char be entered in Java from keyboard

User · Answer

i found this way worked nice             char    a      String temp      Scanner keyboard   new Scanner System in       System out println  please give the first integer          temp keyboard next        a temp toCharArray            you can also get individual one with String charAt

User · Answer

Using nextline and System in read as often proposed requires the user to hit enter after typing a character  However  people searching for an answer to this question  may also be interested in directly respond to a key press in a console   I found a solution to do so using jline3  wherein we first change the terminal into rawmode to directly respond to keys  and then wait for the next entered character   var terminal   TerminalBuilder terminal   terminal enterRawMode   var reader   terminal reader    var c   reader read      lt dependency gt       lt groupId gt org jline lt  groupId gt       lt artifactId gt jline lt  artifactId gt       lt version gt 3 12 3 lt  version gt   lt  dependency gt

User · Answer

You can use a Scanner for this  It s not clear what your exact requirements are  but here s an example that should be illustrative       Scanner sc   new Scanner System in  useDelimiter    s         while   sc hasNext  z              char ch   sc next   charAt 0           System out print       ch                  If you give this input   123 a b c x   y   z   The output is    1   2   3   a   b   c   x   y     So what happens here is that the Scanner uses  s  as delimiter  which is the regex for  zero or more whitespace characters   This skips spaces etc in the input  so you only get non-whitespace characters  one at a time

User · Answer

You can either scan an entire line   Scanner s   new Scanner System in   String str   s nextLine      Or you can read a single char  given you know what encoding you re dealing with   char c    char  System in read

User · Answer

char ch      ch scan next   charAt 0       It s the easy way to get character

User · Answer

You can use Scanner like so   Scanner s  new Scanner System in   char x   s next   charAt 0     By using the charAt function you are able to get the value of the first char without using external casting

User · Answer

Maybe you could try this code   import java io    public class Test   public static void main String   args    try       BufferedReader in   new BufferedReader new InputStreamReader System in      String userInput   in readLine      System out println   n nUser entered - gt      userInput         catch IOException e        System out println  IOException has been caught

User · Answer

Here is a class  getJ  with a static function  chr      This function reads one char   import java io InputStreamReader  import java io BufferedReader  import java io IOException   class getJ       static char  chr  throws IOException            BufferedReader bufferReader  new BufferedReader new InputStreamReader System in            return bufferReader readLine   charAt 0             In order to read a char use this   anyFunc  throws IOException          char c getJ chr        Because of  chr    is static  you don t have to create   getJ  by  new      I mean you don t need to do   getJ ob   new getJ  c ob chr      You should remember to add  throws IOException  to the function s head        If it s impossible  use try   catch  as follows   anyFunc      if it s impossible to add  throws IOException  here     try   char c getJ chr      reads a char into c    catch IOException e    System out println  IOException has been caught        Credit to  tutorialspoint com  See also  geeksforgeeks   java bufferedreader input getchar char

[java] Reading a single char in Java

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