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Comment imprimer l'extension ASCII code en Java à partir d'une valeur entière

public static void main(String[] args) 
{
int i=153;
int j=63;
System.out.println((char)i);
System.out.println((char)j);
}


OUTPUT:-
?
?

J'ai quelques idées sur la raison de cette sortie étrange. Mais quelqu'un peut-il me donner une idée afin que je puisse aussi imprimer les ASCII étendus?.

13
Swayambhu

ASCII 153 (0x99) est différent de Unicode U+0099 (caractère de contrôle).

Solution

Ce programme devrait faire ce que vous avez l'intention de faire:

public class ExtendedAscii {
    public static final char[] EXTENDED = { 0x00C7, 0x00FC, 0x00E9, 0x00E2,
            0x00E4, 0x00E0, 0x00E5, 0x00E7, 0x00EA, 0x00EB, 0x00E8, 0x00EF,
            0x00EE, 0x00EC, 0x00C4, 0x00C5, 0x00C9, 0x00E6, 0x00C6, 0x00F4,
            0x00F6, 0x00F2, 0x00FB, 0x00F9, 0x00FF, 0x00D6, 0x00DC, 0x00A2,
            0x00A3, 0x00A5, 0x20A7, 0x0192, 0x00E1, 0x00ED, 0x00F3, 0x00FA,
            0x00F1, 0x00D1, 0x00AA, 0x00BA, 0x00BF, 0x2310, 0x00AC, 0x00BD,
            0x00BC, 0x00A1, 0x00AB, 0x00BB, 0x2591, 0x2592, 0x2593, 0x2502,
            0x2524, 0x2561, 0x2562, 0x2556, 0x2555, 0x2563, 0x2551, 0x2557,
            0x255D, 0x255C, 0x255B, 0x2510, 0x2514, 0x2534, 0x252C, 0x251C,
            0x2500, 0x253C, 0x255E, 0x255F, 0x255A, 0x2554, 0x2569, 0x2566,
            0x2560, 0x2550, 0x256C, 0x2567, 0x2568, 0x2564, 0x2565, 0x2559,
            0x2558, 0x2552, 0x2553, 0x256B, 0x256A, 0x2518, 0x250C, 0x2588,
            0x2584, 0x258C, 0x2590, 0x2580, 0x03B1, 0x00DF, 0x0393, 0x03C0,
            0x03A3, 0x03C3, 0x00B5, 0x03C4, 0x03A6, 0x0398, 0x03A9, 0x03B4,
            0x221E, 0x03C6, 0x03B5, 0x2229, 0x2261, 0x00B1, 0x2265, 0x2264,
            0x2320, 0x2321, 0x00F7, 0x2248, 0x00B0, 0x2219, 0x00B7, 0x221A,
            0x207F, 0x00B2, 0x25A0, 0x00A0 };

    public static final char getAscii(int code) {
        if (code >= 0x80 && code <= 0xFF) {
            return EXTENDED[code - 0x7F];
        }
        return (char) code;
    }

    public static final void printChar(int code) {
        System.out.printf("%c%n", getAscii(code));
    }

    public static void main(String[] args) {
        printChar(153);
        printChar(63);
    }
}

Sortie:

Ü
?

Comme vous pouvez le voir ci-dessus, le caractère voulu est imprimé correctement.


Extension du concept

De plus, j’ai écrit un programme qui affiche les valeurs Unicode de l’ascii étendu. Comme vous pouvez le voir dans le résultat ci-dessous, beaucoup de caractères ont du mal à s'afficher en tant que variable char.

Code:

public class ExtendedAscii {
    public static final char[] EXTENDED = { 0x00C7, 0x00FC, 0x00E9, 0x00E2,
            0x00E4, 0x00E0, 0x00E5, 0x00E7, 0x00EA, 0x00EB, 0x00E8, 0x00EF,
            0x00EE, 0x00EC, 0x00C4, 0x00C5, 0x00C9, 0x00E6, 0x00C6, 0x00F4,
            0x00F6, 0x00F2, 0x00FB, 0x00F9, 0x00FF, 0x00D6, 0x00DC, 0x00A2,
            0x00A3, 0x00A5, 0x20A7, 0x0192, 0x00E1, 0x00ED, 0x00F3, 0x00FA,
            0x00F1, 0x00D1, 0x00AA, 0x00BA, 0x00BF, 0x2310, 0x00AC, 0x00BD,
            0x00BC, 0x00A1, 0x00AB, 0x00BB, 0x2591, 0x2592, 0x2593, 0x2502,
            0x2524, 0x2561, 0x2562, 0x2556, 0x2555, 0x2563, 0x2551, 0x2557,
            0x255D, 0x255C, 0x255B, 0x2510, 0x2514, 0x2534, 0x252C, 0x251C,
            0x2500, 0x253C, 0x255E, 0x255F, 0x255A, 0x2554, 0x2569, 0x2566,
            0x2560, 0x2550, 0x256C, 0x2567, 0x2568, 0x2564, 0x2565, 0x2559,
            0x2558, 0x2552, 0x2553, 0x256B, 0x256A, 0x2518, 0x250C, 0x2588,
            0x2584, 0x258C, 0x2590, 0x2580, 0x03B1, 0x00DF, 0x0393, 0x03C0,
            0x03A3, 0x03C3, 0x00B5, 0x03C4, 0x03A6, 0x0398, 0x03A9, 0x03B4,
            0x221E, 0x03C6, 0x03B5, 0x2229, 0x2261, 0x00B1, 0x2265, 0x2264,
            0x2320, 0x2321, 0x00F7, 0x2248, 0x00B0, 0x2219, 0x00B7, 0x221A,
            0x207F, 0x00B2, 0x25A0, 0x00A0 };

    public static void main(String[] args) {
        for (char c : EXTENDED) {
            System.out.printf("%s, ", new String(Character.toChars(c)));
        }
    }
}

Sortie:

Ç, ü, â, â, ä, à, å, ç, ê, ë, è, ï, ì, Ä, Ä, Å, É, æ, æ, ô, ô, ò, û, ù, Ö, Ü, ¢, £, ¥,?, Ƒ, á, í, ó, ñ, Ñ, Ñ, ª, º, ¿,?, ½, ¼, ¡, «,»,?,?,?, , -, -, -, -, -, -, -, -, -, -, -, -, -, -, -, -, -, -, -, -, -, -, -, ?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?, ?,?, µ,?,?,?,?,?,?,?,?,?,?,?, ±,?,?,?,?,?,?,?, °,?, °,?,?,?, ²,?, 

Table de référence: ( source )

Dec Hex Unicode     Char    Description
--- --- -------     ----    -----------------------------------
128 80  U+00C7      Ç   latin capital letter c with cedilla
129 81  U+00FC      ü   latin small letter u with diaeresis
130 82  U+00E9      é   latin small letter e with acute
131 83  U+00E2      â   latin small letter a with circumflex
132 84  U+00E4      ä   latin small letter a with diaeresis
133 85  U+00E0      à   latin small letter a with Grave
134 86  U+00E5      å   latin small letter a with ring above
135 87  U+00E7      ç   latin small letter c with cedilla
136 88  U+00EA      ê   latin small letter e with circumflex
137 89  U+00EB      ë   latin small letter e with diaeresis
138 8A  U+00E8      è   latin small letter e with Grave
139 8B  U+00EF      ï   latin small letter i with diaeresis
140 8C  U+00EE      î   latin small letter i with circumflex
141 8D  U+00EC      ì   latin small letter i with Grave
142 8E  U+00C4      Ä   latin capital letter a with diaeresis
143 8F  U+00C5      Å   latin capital letter a with ring above
144 90  U+00C9      É   latin capital letter e with acute
145 91  U+00E6      æ   latin small ligature ae
146 92  U+00C6      Æ   latin capital ligature ae
147 93  U+00F4      ô   latin small letter o with circumflex
148 94  U+00F6      ö   latin small letter o with diaeresis
149 95  U+00F2      ò   latin small letter o with Grave
150 96  U+00FB      û   latin small letter u with circumflex
151 97  U+00F9      ù   latin small letter u with Grave
152 98  U+00FF      ÿ   latin small letter y with diaeresis
153 99  U+00D6      Ö   latin capital letter o with diaeresis
154 9A  U+00DC      Ü   latin capital letter u with diaeresis
155 9B  U+00A2      ¢   cent sign
156 9C  U+00A3      £   pound sign
157 9D  U+00A5      ¥   yen sign
158 9E  U+20A7      ₧   peseta sign
159 9F  U+0192      ƒ   latin small letter f with hook
160 A0  U+00E1      á   latin small letter a with acute
161 A1  U+00ED      í   latin small letter i with acute
162 A2  U+00F3      ó   latin small letter o with acute
163 A3  U+00FA      ú   latin small letter u with acute
164 A4  U+00F1      ñ   latin small letter n with tilde
165 A5  U+00D1      Ñ   latin capital letter n with tilde
166 A6  U+00AA      ª   feminine ordinal indicator
167 A7  U+00BA      º   masculine ordinal indicator
168 A8  U+00BF      ¿   inverted question mark
169 A9  U+2310      ⌐   reversed not sign
170 AA  U+00AC      ¬   not sign
171 AB  U+00BD      ½   vulgar fraction one half
172 AC  U+00BC      ¼   vulgar fraction one quarter
173 AD  U+00A1      ¡   inverted exclamation mark
174 AE  U+00AB      «   left-pointing double angle quotation mark
175 AF  U+00BB      »   right-pointing double angle quotation mark
176 B0  U+2591      ░   light shade
177 B1  U+2592      ▒   medium shade
178 B2  U+2593      ▓   dark shade
179 B3  U+2502      │   box drawings light vertical
180 B4  U+2524      ┤   box drawings light vertical and left
181 B5  U+2561      ╡   box drawings vertical single and left double
182 B6  U+2562      ╢   box drawings vertical double and left single
183 B7  U+2556      ╖   box drawings down double and left single
184 B8  U+2555      ╕   box drawings down single and left double
185 B9  U+2563      ╣   box drawings double vertical and left
186 BA  U+2551      ║   box drawings double vertical
187 BB  U+2557      ╗   box drawings double down and left
188 BC  U+255D      ╝   box drawings double up and left
189 BD  U+255C      ╜   box drawings up double and left single
190 BE  U+255B      ╛   box drawings up single and left double
191 BF  U+2510      ┐   box drawings light down and left
192 C0  U+2514      └   box drawings light up and right
193 C1  U+2534      ┴   box drawings light up and horizontal
194 C2  U+252C      ┬   box drawings light down and horizontal
195 C3  U+251C      ├   box drawings light vertical and right
196 C4  U+2500      ─   box drawings light horizontal
197 C5  U+253C      ┼   box drawings light vertical and horizontal
198 C6  U+255E      ╞   box drawings vertical single and right double
199 C7  U+255F      ╟   box drawings vertical double and right single
200 C8  U+255A      ╚   box drawings double up and right
201 C9  U+2554      ╔   box drawings double down and right
202 CA  U+2569      ╩   box drawings double up and horizontal
203 CB  U+2566      ╦   box drawings double down and horizontal
204 CC  U+2560      ╠   box drawings double vertical and right
205 CD  U+2550      ═   box drawings double horizontal
206 CE  U+256C      ╬   box drawings double vertical and horizontal
207 CF  U+2567      ╧   box drawings up single and horizontal double
208 D0  U+2568      ╨   box drawings up double and horizontal single
209 D1  U+2564      ╤   box drawings down single and horizontal double
210 D2  U+2565      ╥   box drawings down double and horizontal single
211 D3  U+2559      ╙   box drawings up double and right single
212 D4  U+2558      ╘   box drawings up single and right double
213 D5  U+2552      ╒   box drawings down single and right double
214 D6  U+2553      ╓   box drawings down double and right single
215 D7  U+256B      ╫   box drawings vertical double and horizontal single
216 D8  U+256A      ╪   box drawings vertical single and horizontal double
217 D9  U+2518      ┘   box drawings light up and left
218 DA  U+250C      ┌   box drawings light down and right
219 DB  U+2588      █   full block
220 DC  U+2584      ▄   lower half block
221 DD  U+258C      ▌   left half block
222 DE  U+2590      ▐   right half block
223 DF  U+2580      ▀   upper half block
224 E0  U+03B1      α   greek small letter alpha
225 E1  U+00DF      ß   latin small letter sharp s
226 E2  U+0393      Γ   greek capital letter gamma
227 E3  U+03C0      π   greek small letter pi
228 E4  U+03A3      Σ   greek capital letter sigma
229 E5  U+03C3      σ   greek small letter sigma
230 E6  U+00B5      µ   micro sign
231 E7  U+03C4      τ   greek small letter tau
232 E8  U+03A6      Φ   greek capital letter phi
233 E9  U+0398      Θ   greek capital letter theta
234 EA  U+03A9      Ω   greek capital letter omega
235 EB  U+03B4      δ   greek small letter delta
236 EC  U+221E      ∞   infinity
237 ED  U+03C6      φ   greek small letter phi
238 EE  U+03B5      ε   greek small letter epsilon
239 EF  U+2229      ∩   intersection
240 F0  U+2261      ≡   identical to
241 F1  U+00B1      ±   plus-minus sign
242 F2  U+2265      ≥   greater-than or equal to
243 F3  U+2264      ≤   less-than or equal to
244 F4  U+2320      ⌠   top half integral
245 F5  U+2321      ⌡   bottom half integral
246 F6  U+00F7      ÷   division sign
247 F7  U+2248      ≈   almost equal to
248 F8  U+00B0      °   degree sign
249 F9  U+2219      ∙   bullet operator
250 FA  U+00B7      ·   middle dot
251 FB  U+221A      √   square root
252 FC  U+207F      ⁿ   superscript latin small letter n
253 FD  U+00B2      ²   superscript two
254 FE  U+25A0      ■   black square
255 FF  U+00A0      no-break space
15
Mr. Polywhirl

"Extended ASCII" est nébuleux. Il existe de nombreuses extensions de ASCII qui définissent des glyphes pour les valeurs d'octet comprises entre 127 et 255. Celles-ci sont appelées pages de code . Certains des plus communs incluent:

  • CP437 , le standard sur les PC IBM d'origine
  • ISO 8859-1 aussi appelée Page de code 1252 , le codage utilisé par la plupart des versions de Windows en langues occidentales occidentales pour tout sauf la console

Vous devez vraiment savoir ce que le codage de caractères votre terminal attend, sinon vous allez imprimer garbage . En Java, vous devriez pouvoir vérifier la valeur de Charset.defaultCharset() ( Charset documentation ).

Il existe bien plus de moyens de coder des caractères que des pages de code "ASCII étendu" à un octet. Unicode nécessite beaucoup plus de points de code que 255, il existe donc divers codages à largeur fixe et à largeur variable fréquemment utilisés. Cette page semble être un bon guide pour l’encodage de caractères en Java .

4
bonsaiviking
String iChar = new Character((char)i).toString(); 
String jChar = new Character((char)j).toString(); 

System.out.println(iChar);
System.out.println(jChar);
0
Zhenxiao Hao

S'il s'agit d'un problème d'encodage de terminal, je pense que cette réponse https://stackoverflow.com/a/362006/4828060

est un moyen simple et rapide de contourner le problème. Ajoutez simplement - Dfile.encoding = some_encoding aux paramètres de la commande Java, 

par exemple . Java -Dfile.encoding = UTF-8… MainClass

0
João Matos