Converting stream of int s to char s in java

Question

This has probably been answered else where but how do you get the character value of an int value   Specifically I m reading a from a tcp stream and the readers  read   method returns an int   How do I get a char from this

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int i   7      char number   Integer toString i  charAt 0       System out println number

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If you want to simply convert int 5 to char  5    Only for integers 0 - 9   int i   5  char c    char    0    i      c is now  5

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It depends on what you mean by  convert an int to char    If you simply want to cast the value in the int  you can cast it using Java s typecast notation   int i   97     97 is  a  in ASCII char c    char  i     c is now  a    If you mean transforming the integer 1 into the character  1   you can do it like this   if  i  gt   0  amp  amp  i  lt   9    char c   Character forDigit i  10

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Most answers here propose shortcuts  which can bring you in big problems if you have no idea what you are doing  If you want to take shortcuts  then you have to know exactly what encoding your data is in   UTF-16  Whenever java talks about characters in its documentation  it talks about 16-bit characters   You can use a DataInputStream  which has convenient methods  For efficiency  wrap it in a BufferedReader      e g  for sockets DataInputStream in   new DataInputStream new BufferedInputStream socket getInputStream      char character   readChar       no need to cast   The thing is that each readChar   will actually perform 2 read s and combine them to one 16-bit character   US-ASCII  US-ASCII reserves 8 bits to encode 1 character  The ASCII table only describes 128 possible characters though  so 1 bit is always unused    You can simply perform a cast in this case   int input   stream read    if  input  lt  0  throw new EOFException    char character    char  input    Extended ASCII  UTF-8  Latin-1  ANSI and many other encodings use all 8-bits  The first 7-bit follow the ASCII table and are identical to the ones of the US-ASCII encoding  However  the 8th bit offers characters that are different in all these encodings  So  here things get interesting   If you are a cowboy  and you think that the 8th bit does not matter  i e  you don t care about characters like                          then you can get away with a simple cast   However  if you want to do this professionally  you should really ALWAYS specify a charset whenever you import export text  e g  sockets  files        Always use charsets  Let s get serious  All the above options are cheap tricks  If you want to write flexible software you need to support a configurable charset to import export your data  Here s a generic solution   Read your data using a byte   buffer and to convert that to a String using a charset parameter   byte   buffer   new byte 1024   int nrOfBytes   stream read buffer   String result   new String buffer  nrOfBytes  charset     You can also use an InputStreamReader which can be instantiated with a charset parameter   Just one more golden rule  don t ever directly cast a byte to a character  That s always a mistake

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maybe not the fastest one     for example there is an integer with the value of 5  int i   5     getting the char  5  out of it  char c   String format   s  i  charAt 0

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This is entirely dependent on the encoding of the incoming data

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Maybe you are asking for   Character toChars 65     returns   A     More info  Character toChars int codePoint      Converts the specified character  Unicode code point  to its UTF-16 representation stored in a char array  If the specified code point is a BMP  Basic Multilingual Plane or Plane 0  value  the resulting char array has the same value as codePoint  If the specified code point is a supplementary code point  the resulting char array has the corresponding surrogate pair

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Basing my answer on assumption that user just wanted to literaaly convert an int to char   for example   Input   int i   5   Output  char c    5    This has been already answered above  however if the integer value i   gt  10  then need to use char array   char   c   String valueOf i  toCharArray

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This solution works for Integer length size  1   Integer input   9  Character valueOf  char  input toString   charAt 0    if size  1 we need to use for loop and iterate through

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If you re trying to convert a stream into text  you need to be aware of which encoding you want to use  You can then either pass an array of bytes into the String constructor and provide a Charset  or use InputStreamReader with the appropriate Charset instead   Simply casting from int to char only works if you want ISO-8859-1  if you re reading bytes from a stream directly   EDIT  If you are already using a Reader  then casting the return value of read   to char is the right way to go  after checking whether it s -1 or not     but it s normally more efficient and convenient to call read char    int  int  to read a whole block of text at a time  Don t forget to check the return value though  to see how many characters have been read

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Simple casting   int a   99  char c    char  a    Is there any reason this is not working for you

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The answer for conversion of char to int or long is simple casting   For example - if you would like to convert Char  0  into long   Follow simple cast  Char ch  0   String convertedChar  Character toString ch      Convert Char to String  Long finalLongValue Long parseLong convertedChar     Done

[java] Converting stream of int's to char's in java

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