Java Utililty Methods BigInteger Value Check

List of utility methods to do BigInteger Value Check

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Description

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

Method

booleanisPowerOfTwo(BigInteger bintValue)
is Power Of Two 
int bitIndex = bintValue.getLowestSetBit();
if (bitIndex < 0) {
    return false;
return bintValue.clearBit(bitIndex).equals(BigInteger.ZERO);
booleanisPowerOfTwo(BigInteger x)
is Power Of Two 
return x.signum() > 0 && x.getLowestSetBit() == x.bitLength() - 1;
booleanisRootInQuadraticResidues(BigInteger n, BigInteger p)
is Root In Quadratic Residues 
BigInteger tow = BigInteger.valueOf(2);
BigInteger x = n.mod(p);
if (p.equals(tow)) {
    return x.mod(tow).equals(BigInteger.ONE);
BigInteger exponent = p.subtract(BigInteger.ONE).divide(tow);
return x.modPow(exponent, p).equals(BigInteger.ONE);
booleanisSqrtXXX(BigInteger n, BigInteger root)
is Sqrt XXX 
final BigInteger lowerBound = root.pow(2);
final BigInteger upperBound = root.add(BigInteger.ONE).pow(2);
return lowerBound.compareTo(n) <= 0 && n.compareTo(upperBound) < 0;
booleanisZero(BigInteger value)
is Zero 
return value.compareTo(BigInteger.ZERO) == 0;