Tendrías que crear un array con todos los caracteres extendidos. Ejemplo:
import java.util.Scanner;
public class Main {
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 getAsciiCharacter(int code) {
if (code >= 0x80 && code <= 0xFF) {
return EXTENDED[code - 0x7F];
}
return (char) code;
}
public static final int getAsciiCode(char character) {
int code = (int) character;
for(short i=0; i < EXTENDED.length; i++) {
if(EXTENDED[i] == character)
code = 128 + i;
}
return code;
}
public static final void printCharacter(int code) {
System.
out.
printf("%c%n", getAsciiCharacter
(code
)); }
public static void main
(String[] args
) { Scanner reader
= new Scanner
(System.
in);
System.
out.
print("Ingrese un carácter: "); char character = reader.next().charAt(0);
int asciiCode = getAsciiCode(character);
System.
out.
println("El carácter es "+ character
+" y su código ascii es: " + asciiCode
); }
}