Variable-Precision Numeric Data - JAVA Programming for Engineers - page 242

BigInteger(int numBits, Random rnd)
ConstructsarandomlygeneratedBigInteger,uniformlydistributedover
therange0to(2 numBits-1 ),inclusive.Inthisformoftheconstructorthebigin-
tegervalueisinitializedwithnumBitsnumberofrandombits.Theparame-
terrndisusedtogeneratetherandombits.Thevalueisnevernegative.

BigInteger(String val)
TranslatesthedecimalStringrepresentationofaBigIntegerintoa
BigInteger.Inthisformoftheconstructorvalisparsedasaradix10number
toobtainthebigintegervalue.Thefirstcharactercanoptionallybeanega-
tivesign.Theparametervalmustnotcontainspacesandmustincludeat
leastonedigit.Thisconstructorformiscompatiblewiththestringsgener-
atedbythetoString()method.

BigInteger(String val, int rdix)
TranslatestheStringrepresentationofaBigIntegerinthespecifiedradix
intoaBigInteger.Inthisformoftheconstructortheparametervalisparsed
asaradixrdixnumbertoobtainthebigintegervalue.Thefirstcharacter
canoptionallycanbeanegativesign.Thestringvalmustnotcontainspaces
andmustincludeatleastonedigit.

BigInteger methods
ThereareoverfortymethodsintheBigIntegerclass . Table22-3 i ssummary
of these methods.

Table 22-3
Methods in the BigInteger Class

RETURNS METHOD/ACTION

BigInteger abs()
Returns a BigInteger whose value is the
absolute value of this BigInteger
BigInteger add(BigInteger val)
Returns a BigInteger whose value is (this val)

BigInteger and(BigInteger val)

Returns a BigInteger whose value is (this & val)

BigInteger andNot(BigInteger val)

Returns a BigInteger whose value is (this &
~val)

int bitCount()

Returns the number of bits in the two's
complement representation of this BigInteger
that differfrom its sign bit

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