Java Utililty Methods BigInteger Value Check

boolean isBigger(final BigInteger big1, final BigInteger big2)
Returns whether the first BigInteger is bigger than the second.

final int compared = big1.compareTo(big2);
if (compared > 0) {
 return true;
return false;

boolean isCovers(BigInteger covers, BigInteger value)
is Covers

return covers.compareTo(value) > -1;

boolean isDefined(BigInteger no)
Checking if the BigInteger is set.

return no != null;

boolean isElementOfZn(BigInteger element, BigInteger n)
is Element Of Zn

return (element.compareTo(BigInteger.ZERO) != -1) && (element.compareTo(n) == -1);

boolean isEven(BigInteger x)
is Even

return !isOdd(x);

boolean isFermatNumber(BigInteger f)
Method to check if a given number is a Fermat number.

if (f.signum() <= 0)
 return false;
byte bytes[] = f.toByteArray();
int bLength = bytes.length - 1;
if (bLength == 0) {
 switch (bytes[0]) {
 case 3:
 case 5:
...

boolean isGoodGaAndGb(BigInteger g_a, BigInteger p)
is Good Ga And Gb

return !(g_a.compareTo(BigInteger.valueOf(1)) != 1
 || g_a.compareTo(p.subtract(BigInteger.valueOf(1))) != -1);

boolean isIn20PercentRange(BigInteger first, BigInteger second)
is In Percent Range

BigInteger five = BigInteger.valueOf(5);
BigInteger limit = first.add(first.divide(five));
return !isMoreThan(second, limit);

boolean isInRange(BigInteger in, int range, double eps)
Tests whether a given BigInteger is in the following range: [-2^range, 2^(eps * range)-1] (inclusive).

if (((in.signum() > 0) && (in.bitLength() > (int) (eps * range))
 && (in.compareTo(BigInteger.valueOf(1).shiftLeft(range)) > 0))
 || ((in.signum() < 0) && (in.bitLength() > range)
 && (in.compareTo(BigInteger.valueOf(-1).shiftLeft(range)) < 0)))
 return false;
return true;

boolean isInt(final BigInteger i)
is Int

return i.compareTo(MIN_INT) >= 0 && i.compareTo(MAX_INT) <= 0;