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

booleanfirstLtSecond(BigInteger first, BigInteger second)
first Lt Second 
return first.compareTo(second) == -1;
BigIntegergcd(BigInteger a, BigInteger b)
gcd 
if (a.compareTo(b) < 0) {
    BigInteger t = b;
    b = a;
    a = t;
BigInteger r = null;
do {
    r = a.mod(b);
...
BigIntegerGCD(BigInteger x, BigInteger y)
GCD 
if (x.equals(BigInteger.ZERO)) {
    return y;
} else if (y.equals(BigInteger.ZERO)) {
    return x;
} else if (isEven(x) && isEven(y)) {
    x = x.shiftRight(1);
    y = y.shiftRight(1);
    return GCD(x, y).shiftLeft(1);
...
BigIntegergcd(BigInteger... values)
Calculates the greatest common divisor of the specified BigInteger big integer numbers. 
if (values.length == 0)
    return BigInteger.ONE;
int allSgn = values[0].signum();
BigInteger gcd = values[0];
for (int i = 1; i < values.length; i++) {
    if (allSgn != values[i].signum())
        allSgn = 1;
    if (gcd.signum() == 0 || gcd.equals(BigInteger.ONE))
...
BigIntegergcd(Iterable nums)
gcd 
BigInteger ret = null;
for (BigInteger num : nums) {
    if (ret == null) {
        ret = num;
    } else {
        ret = ret.gcd(num);
return ret;
BigIntegergcdEuclides(BigInteger a, BigInteger b)
gcd Euclides 
if (b.equals(BigInteger.ZERO)) {
    return a;
return gcdEuclides(b, a.mod(b));
BigInteger[]gcdExtended(BigInteger p, BigInteger q)
gcd Extended 
if (q.equals(BigInteger.ZERO))
    return new BigInteger[] { p, BigInteger.ONE, BigInteger.ZERO };
BigInteger[] vector = gcdExtended(q, p.mod(q));
BigInteger d = vector[0];
BigInteger a = vector[2];
BigInteger b = vector[1].subtract(p.divide(q).multiply(vector[2]));
return new BigInteger[] { d, a, b };
StringgetAddressText(BigInteger address)
get Address Text 
if (address == null) {
    return "<null>"; 
if (address.compareTo(BigInteger.ZERO) < 0) {
    return address.toString();
String hex = address.toString(16);
return "0x" + "0000000000000000".substring(hex.length() + (address.bitLength() <= 32 ? 8 : 0)) + hex; 
...
byte[]getByteArrayFromBigIntegerArray(Object value)
Convert an instance of our value class into a byte[]. 
if (value == null) {
    return null;
BigInteger[] a = (BigInteger[]) value;
long[] d = new long[a.length];
for (int i = 0; i < a.length; i++) {
    d[i] = a[i].longValue();
return getByteArrayFromLongArray(d);
byte[]getBytes(BigInteger bi, int minLen)
get Bytes 
byte[] ret = bi.toByteArray();
if (ret[0] == 0) {
    byte copy[] = new byte[ret.length - 1];
    System.arraycopy(ret, 1, copy, 0, copy.length);
    ret = copy;
byte copy[] = new byte[minLen];
if (bi.compareTo(BigInteger.ZERO) < 0) {
...