Java Utililty Methods BigInteger Calculate

List of utility methods to do BigInteger Calculate

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Description

The list of methods to do BigInteger Calculate are organized into topic(s).

Method

Stringint2zpBin(BigInteger num, int len)
intzp Bin 
final String zeroPadding = rep('0', len);
final String numString = num.toString(2);
return (zeroPadding.substring(numString.length()) + numString);
StringintegerToString(BigInteger value)
integer To String 
StringBuilder s = new StringBuilder();
while (value.bitLength() > 0) {
    BigInteger[] result = value.divideAndRemainder(BigInteger.valueOf(62));
    value = result[0];
    char c = intToChar(result[1].intValue());
    s.insert(0, c);
return s.toString();
...
intintValue(BigInteger bi)
Converts a BigInteger to an integer, if the BigInteger is in the correct range. 
if (bi.compareTo(MIN_INT_BIG_INTEGER) < 0)
    throw new IllegalArgumentException("BigInteger [" + bi + "] is too small to convert to int.");
if (bi.compareTo(MAX_INT_BIG_INTEGER) > 0)
    throw new IllegalArgumentException("BigInteger [" + bi + "] is too big to convert to int.");
return bi.intValue();
intintValueExact(BigInteger bigint)
int Value Exact 
if (bigint == null || bigint.bitLength() > 31) {
    throw new ArithmeticException();
return bigint.intValue();
BigIntegerjsonBigInteger(JsonValue value)
json Big Integer 
if (value == null || value.getValueType() == JsonValue.ValueType.NULL)
    return null;
if (value.getValueType() == JsonValue.ValueType.NUMBER && (value instanceof JsonNumber))
    return ((JsonNumber) value).bigIntegerValue();
if (value.getValueType() == JsonValue.ValueType.STRING && (value instanceof JsonString)) {
    try {
        return new BigInteger(((JsonString) value).getString());
    } catch (NumberFormatException ex) {
...
intlength(BigInteger bi)
length 
int length = 0;
while (bi.compareTo(BigInteger.ZERO) > 0) {
    bi = bi.divide(BigInteger.TEN);
    length++;
return length;
BigIntegerlistToBigInteger(List list)
Transforms a List of Integer s representing non-zero bits into a BigInteger of the represented value. 
if (list == null || list.isEmpty()) {
    return BigInteger.ZERO;
list.sort((i1, i2) -> i1 > i2 ? 1 : -1);
int max = list.get(list.size() - 1);
StringBuilder buffer = new StringBuilder();
for (int i = 0; i < max; ++i) {
    buffer.append('0');
...
intlog2(BigInteger x)
log 
return x.bitLength() - 1;
BigIntegermaskBits(BigInteger value, int bits)
mask Bits 
BigInteger mask = BigInteger.ONE.shiftLeft(bits).subtract(BigInteger.ONE);
return value.and(mask);
BigIntegermin(BigInteger a, BigInteger b)
Since Math.max() doesn't handle BigInteger 
if (a == null)
    return b;
if (b == null)
    return a;
int c = a.compareTo(b);
return c > 0 ? b : a;