Running EncodingSampler.java with CP1252 Encoding

JDK Tutorials - Herong's Tutorial Examples

∟Character Set Encoding Classes and Methods

∟Running EncodingSampler.java with CP1252 Encoding

This section provides a tutorial example on how to run the character encoding sample program with CP1252 encoding for character value range of 0x0000 - 0x00FF.

First, let's run my sample program, EncodingSampler.java, without any argument will use the JVM's default encoding:

herong> java EncodingSampler.java

Default (Cp1252) encoding:
Char, String, Writer, Charset, Encoder
0000, 00, 00, 00, 00
003F, 3F, 3F, 3F, 3F
0040, 40, 40, 40, 40
007F, 7F, 7F, 7F, 7F
0080, 3F, 3F, 3F, 00
00BF, BF, BF, BF, BF
00C0, C0, C0, C0, C0
00FF, FF, FF, FF, FF
0100, 3F, 3F, 3F, 00
3FFF, 3F, 3F, 3F, 00
4000, 3F, 3F, 3F, 00
7FFF, 3F, 3F, 3F, 00
8000, 3F, 3F, 3F, 00
BFFF, 3F, 3F, 3F, 00
C000, 3F, 3F, 3F, 00
EFFF, 3F, 3F, 3F, 00
F000, 3F, 3F, 3F, 00
FFFF, 3F, 3F, 3F, 00

The results shows that:

The default encoding of the String class seems to be the same as OutputStreamWriter: Cp1252.
There are a number of characters that cannot be encoded by Cp1252. The String, OutputStreamWriter, and Charset classes are returning 0x3F for those non-encodable characters.
It's obvious that Cp1252 works on a character set in the 0x0000 - 0x00FF range.

To confirm that JDK default encoding is Cp1252, let's run the sample program again with 'CP1252' as argument. The result should be the same as the previous test:

herong> java EncodingSampler.java CP1252

CP1252 encoding:
Char, String, Writer, Charset, Encoder
0000, 00, 00, 00, 00
003F, 3F, 3F, 3F, 3F
0040, 40, 40, 40, 40
007F, 7F, 7F, 7F, 7F
0080, 3F, 3F, 3F, 00
00BF, BF, BF, BF, BF
00C0, C0, C0, C0, C0
00FF, FF, FF, FF, FF
0100, 3F, 3F, 3F, 00
3FFF, 3F, 3F, 3F, 00
4000, 3F, 3F, 3F, 00
7FFF, 3F, 3F, 3F, 00
8000, 3F, 3F, 3F, 00
BFFF, 3F, 3F, 3F, 00
C000, 3F, 3F, 3F, 00
EFFF, 3F, 3F, 3F, 00
F000, 3F, 3F, 3F, 00
FFFF, 3F, 3F, 3F, 00

However, if you are using macOS computer, the default encoding is UTF-8:

herong$ java EncodingSampler.java

Default (UTF8) encoding:
Char, String, Writer, Charset, Encoder
0000, 00, 00, 00, 00
003F, 3F, 3F, 3F, 3F
0040, 40, 40, 40, 40
007F, 7F, 7F, 7F, 7F
0080, C2 80, C2 80, C2 80, C2 80
00BF, C2 BF, C2 BF, C2 BF, C2 BF
00C0, C3 80, C3 80, C3 80, C3 80
00FF, C3 BF, C3 BF, C3 BF, C3 BF
0100, C4 80, C4 80, C4 80, C4 80
3FFF, E3 BF BF, E3 BF BF, E3 BF BF, E3 BF BF
4000, E4 80 80, E4 80 80, E4 80 80, E4 80 80
7FFF, E7 BF BF, E7 BF BF, E7 BF BF, E7 BF BF
8000, E8 80 80, E8 80 80, E8 80 80, E8 80 80
BFFF, EB BF BF, EB BF BF, EB BF BF, EB BF BF
C000, EC 80 80, EC 80 80, EC 80 80, EC 80 80
EFFF, EE BF BF, EE BF BF, EE BF BF, EE BF BF
F000, EF 80 80, EF 80 80, EF 80 80, EF 80 80
FFFF, EF BF BF, EF BF BF, EF BF BF, EF BF BF