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java Programming Glossary: bitsetMost elegant way to generate prime numbers http://stackoverflow.com/questions/1042902/most-elegant-way-to-generate-prime-numbers primes in about a second on a normal laptop public static BitSet computePrimes int limit final BitSet primes new BitSet primes.set.. laptop public static BitSet computePrimes int limit final BitSet primes new BitSet primes.set 0 false primes.set 1 false primes.set.. BitSet computePrimes int limit final BitSet primes new BitSet primes.set 0 false primes.set 1 false primes.set 2 limit true..
What would be the fastest method to test for primality in Java? http://stackoverflow.com/questions/2385909/what-would-be-the-fastest-method-to-test-for-primality-in-java certainty . So I performed a couple of tests. I created a BitSet of size Integer.MAX_VALUE 2 representing all uneven numbers.. my test rig import java.math.BigInteger import java.util.BitSet public class Main static BitSet primes static boolean isPrime.. import java.util.BitSet public class Main static BitSet primes static boolean isPrime int p return p 0 p 2 p 2 0 primes.get..
BitSet to and from integer/long http://stackoverflow.com/questions/2473597/bitset-to-and-from-integer-long to and from integer long If I have an integer that I'd like.. bit manipulation on how can I load it into a java.util.BitSet How can I convert it back to an int or long I'm not so concerned.. an int or long I'm not so concerned about the size of the BitSet it will always be 32 or 64 bits long. I'd just like to use the..
What is the memory consumption of an object in Java? http://stackoverflow.com/questions/258120/what-is-the-memory-consumption-of-an-object-in-java decide to store a boolean in 64 bit long chunks like a BitSet . It does not have to tell you so long as the program gives..
Java Array, Finding Duplicates http://stackoverflow.com/questions/3951547/java-array-finding-duplicates all over the place but here's the code import java.util.BitSet class Yuk static boolean duplicatesZero final int zipcodelist.. duplicatesTwo final int zipcodelist final int MAXZIP 99999 BitSet b new BitSet MAXZIP 1 b.set 0 MAXZIP false for int item zipcodelist.. final int zipcodelist final int MAXZIP 99999 BitSet b new BitSet MAXZIP 1 b.set 0 MAXZIP false for int item zipcodelist if b.get..
Boolean[] vs. BitSet: Which is more efficient? http://stackoverflow.com/questions/605226/boolean-vs-bitset-which-is-more-efficient vs. BitSet Which is more efficient What is more efficient in terms of.. in terms of memory and CPU usage an array of booleans or a BitSet Specific BitSet methods are not used only get set clear Arrays.fill.. and CPU usage an array of booleans or a BitSet Specific BitSet methods are not used only get set clear Arrays.fill respectively..
Java 7 language features with Android http://stackoverflow.com/questions/7153989/java-7-language-features-with-android .getDisplayName but without .getNumericCode BitSet .previousSetBit .previousClearBit .valueOf .toLongArray .toByteArray..
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