Java Utililty Methods Digit From

List of utility methods to do Digit From

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Description

The list of methods to do Digit From are organized into topic(s).

Method

inttoDigit(char c)
to Digit 
if (c >= '0' && c <= '9')
    return c - '0';
if (c >= 'a' && c <= 'f')
    return c - 'a' + 10;
if (c >= 'A' && c <= 'F')
    return c - 'A' + 10;
return -1;
inttoDigit(char ch)
Converts the character to a digit, throws an IllegalStateException if it isn't a valid digit. 
if (('0' <= ch) && (ch <= '9')) {
    return ch - '0';
throw new IllegalStateException();
inttoDigit(char ch, int index)
to Digit 
int digit = Character.digit(ch, 16);
if (digit == -1)
    throw new IllegalStateException("Illegal hexadecimal charcter " + ch + " at index " + index);
return digit;
inttoDigit(final boolean bit)
Converts a boolean into a digit. 
return (bit) ? TRUE : FALSE;
inttoDigit(final char ch, final int index)
to Digit 
final int digit = fastDigit(ch);
if (digit == -1) {
    throw new RuntimeException("Illegal hexadecimal charcter " + ch + " at index " + index);
return digit;
inttoDigit(final char ch, final int index)
Converts a hexadecimal character to an integer. 
final int digit = Character.digit(ch, 16);
if (digit == -1) {
    throw new IllegalArgumentException("Illegal hexadecimal character " + ch + " at index " + index);
return digit;
chartoDigit(final int value)
to Digit 
assert 0 <= value && value < RADIX;
return Character.forDigit(value, RADIX);
inttoDigit(int c)
to Digit 
if (c > '9') {
    if (c > 'F') {
        if (c >= 'a' && c <= 'f') {
            return c - 'a' + 10;
    } else if (c >= 'A') {
        return c - 'A' + 10;
} else if (c >= '0') {
    return c - '0';
throw new IllegalArgumentException();
chartoDigit(int i)
Converts a digit to its char representation. 
if (i >= 0 && i <= 9) {
    return (char) ('0' + i);
} else if (i >= 10 && i < 36) {
    return (char) ('A' + i - 10);
} else {
    throw new IllegalArgumentException("i must be at least 0 and no greater than 35. Invalid i: " + i);
chartoDigit(int n)
Returns the hex digit corresponding to a number n, from 0 to 15. 
try {
    return hexDigits[n];
} catch (ArrayIndexOutOfBoundsException e) {
    throw new IllegalArgumentException(n + " is out of range for a hex digit");