Java Utililty Methods BitSet to

List of utility methods to do BitSet to

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Description

The list of methods to do BitSet to are organized into topic(s).

Method

StringBitset2BitString(BitSet bitset, int length)
Converts the given BitSet to a {0,1}-String of the given length. 
if (bitset.size() < length) {
    throw new IllegalArgumentException("length if longer than the bitset lenght");
StringBuilder builder = new StringBuilder(length);
for (int i = length - 1; i >= 0; i--) {
    if (bitset.get(i)) {
        builder.append("1");
    } else {
...
byte[]bitSet2byte(BitSet b, int bytes)
converts a BitSet into a binary field used in pack routines 
int len = bytes * 8;
byte[] d = new byte[bytes];
for (int i = 0; i < len; i++) {
    if (b.get(i + 1)) {
        d[i >> 3] |= (0x80 >> (i % 8));
if (len > 64) {
...
bytebitset2bytes(BitSet bits, byte[] bytes)
bitsetbytes 
byte nbyte = (byte) (bits.length() / 8 + 1);
if (bytes.length < nbyte) {
    bytes = new byte[nbyte];
for (int i = 0; i < bits.length(); i++) {
    if (bits.get(i)) {
        bytes[nbyte - i / 8 - 1] |= 1 << (i % 8);
return nbyte;
byte[]bitSet2extendedByte(BitSet b)
Converts a BitSet into an extended binary field used in pack routines. 
int len = 128;
byte[] d = new byte[len >> 3];
for (int i = 0; i < len; i++)
    if (b.get(i + 1))
        d[i >> 3] |= (0x80 >> (i % 8));
d[0] |= 0x80;
return d;
intbitSet2Int(BitSet bs)
bit Set Int 
int total = 0;
int b = bs.length() - 1;
if (b > 0) {
    int value = (int) Math.pow(2, b);
    for (int i = 0; i <= b; i++) {
        if (bs.get(i))
            total += value;
        value = value >> 1;
...
double[]bitsetToDoubleArray(BitSet bs, int n)
Create an n-element array of doubles (0s and 1s) from a BitSet. 
int i;
double res[] = new double[n];
for (i = 0; i < n; i++)
    res[i] = bs.get(i) ? 1.0 : 0.0;
return res;
int[]bitsetToIndices(BitSet bits)
Returns a newly constructed array containing the indices of the non-zero bits. 
final int[] indices = new int[bits.cardinality()];
for (int i = 0, index = -1, end = indices.length; i < end; ++i) {
    index = bits.nextSetBit(++index);
    indices[i] = index;
return indices;
intbitSetToInt(final BitSet bitSet)
Gets the integer value from a given Bitset. 
int bitInteger = 0;
for (int i = 0; i < 32; i++) {
    if (bitSet.get(i)) {
        bitInteger |= 1 << i;
return bitInteger;
longbitSetToLong(BitSet set)
bit Set To Long 
int max = set.length();
long bits = 0;
for (int count = 0; count < max; count++) {
    if (set.get(count))
        bits |= (1L << count);
return bits;
MapbitSetToMap(Map map, String key, BitSet bits, int length)
Stores a BitSet object as a string in a map. 
map.put(key, bitSetToString(bits, length));
return map;