/ 写在前面 – 我热爱技术、热爱开源。我也相信开源能使技术变得更好、共享能使知识传播得更远。但是开源并不意味着某些商业机构/个人可以为了自身的利益而一味地索取，甚至直接剽窃大家曾为之辛勤付出的知识成果，所以本文未经允许，不得转载，谢谢。/

Introduction

ASCII stands for American Standard Code for Information Interchange. Below is the ASCII character table, including descriptions of the first 32 characters. ASCII was originally designed for use with teletypes, and so the descriptions are somewhat obscure and their use is frequently not as intended.

Java actually uses Unicode, which includes ASCII and other characters from languages around the world.

  1. Dec  = Decimal Value
  2. Hex  = Hexadecimal Value
  3. Char = Character
  5. '5' has the int value 53.
  6. If we write '5'-'0' it evaluates to 53-48, or the int 5.
  7. If we write char c = 'B'+32, then c stores 'b'.

High Frequency

  1. Dec  Hex   Char
  2. ---------------
  3.  10    A   LF
  4.  13    D   CR
  5.  32   20   SPACE
  6.  48   30   0
  7.  65   41   A
  8.  90   5A   Z
  9.  97   61   a
  10. 122   7A   z

All

  1. Dec  Hex   Char                           Dec  Hex   Char     Dec  Hex   Char     Dec  Hex   Char
  2. ---------------                           ---------------     ---------------     ---------------
  3.   0    0   NUL (null)                      32   20   SPACE     64   40   @         96   60   `
  4.   1    1   SOH (start of heading)          33   21   !         65   41   A         97   61   a
  5.   2    2   STX (start of text)             34   22   "         66   42   B         98   62   b
  6.   3    3   ETX (end of text)               35   23   #         67   43   C         99   63   c
  7.   4    4   EOT (end of transmission)       36   24   $         68   44   D        100   64   d
  8.   5    5   ENQ (enquiry)                   37   25   %         69   45   E        101   65   e
  9.   6    6   ACK (acknowledge)               38   26   &         70   46   F        102   66   f
  10.   7    7   BEL (bell)                      39   27   '         71   47   G        103   67   g
  11.   8    8   BS  (backspace)                 40   28   (         72   48   H        104   68   h
  12.   9    9   TAB (horizontal tab)            41   29   )         73   49   I        105   69   i
  13.  10    A   LF  (NL line feed, new line)    42   2A   *         74   4A   J        106   6A   j
  14.  11    B   VT  (vertical tab)              43   2B   +         75   4B   K        107   6B   k
  15.  12    C   FF  (NP form feed, new page)    44   2C   ,         76   4C   L        108   6C   l
  16.  13    D   CR  (carriage return)           45   2D   -         77   4D   M        109   6D   m
  17.  14    E   SO  (shift out)                 46   2E   .         78   4E   N        110   6E   n
  18.  15    F   SI  (shift in)                  47   2F   /         79   4F   O        111   6F   o
  19.  16   10   DLE (data link escape)          48   30   0         80   50   P        112   70   p
  20.  17   11   DC1 (device control 1)          49   31   1         81   51   Q        113   71   q
  21.  18   12   DC2 (device control 2)          50   32   2         82   52   R        114   72   r
  22.  19   13   DC3 (device control 3)          51   33   3         83   53   S        115   73   s
  23.  20   14   DC4 (device control 4)          52   34   4         84   54   T        116   74   t
  24.  21   15   NAK (negative acknowledge)      53   35   5         85   55   U        117   75   u
  25.  22   16   SYN (synchronous idle)          54   36   6         86   56   V        118   76   v
  26.  23   17   ETB (end of trans. block)       55   37   7         87   57   W        119   77   w
  27.  24   18   CAN (cancel)                    56   38   8         88   58   X        120   78   x
  28.  25   19   EM  (end of medium)             57   39   9         89   59   Y        121   79   y
  29.  26   1A   SUB (substitute)                58   3A   :         90   5A   Z        122   7A   z
  30.  27   1B   ESC (escape)                    59   3B   ;         91   5B   [        123   7B   {
  31.  28   1C   FS  (file separator)            60   3C   <         92   5C   \        124   7C   |
  32.  29   1D   GS  (group separator)           61   3D   =         93   5D   ]        125   7D   }
  33.  30   1E   RS  (record separator)          62   3E   >         94   5E   ^        126   7E   ~
  34.  31   1F   US  (unit separator)            63   3F   ?         95   5F   _        127   7F   DEL