# BitSet
public class **BitSet** extends [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)
implements [Cloneable](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Cloneable.html) [Serializable](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/Serializable.html) This class implements a vector of bits that grows as needed. Each
component of the bit set has a `boolean` value. The
bits of a `BitSet` are indexed by nonnegative integers.
Individual indexed bits can be examined, set, or cleared. One
`BitSet` may be used to modify the contents of another
`BitSet` through logical AND, logical inclusive OR, and
logical exclusive OR operations.
By default, all bits in the set initially have the value
`false`.
Every bit set has a current size, which is the number of bits
of space currently in use by the bit set. Note that the size is
related to the implementation of a bit set, so it may change with
implementation. The length of a bit set relates to logical length
of a bit set and is defined independently of implementation.
Unless otherwise noted, passing a null parameter to any of the
methods in a `BitSet` will result in a
`NullPointerException`.
A `BitSet` is not safe for multithreaded use without
external synchronization.
### Public Constructor Summary
|---|---|
| | [BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#BitSet())() Creates a new bit set. |
| | [BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#BitSet(int))(int nbits) Creates a bit set whose initial size is large enough to explicitly represent bits with indices in the range `0` through `nbits-1`. |
### Public Method Summary
|---|---|
| void | [and](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#and(java.util.BitSet))([BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html) set) Performs a logical **AND** of this target bit set with the argument bit set. |
| void | [andNot](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#andNot(java.util.BitSet))([BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html) set) Clears all of the bits in this `BitSet` whose corresponding bit is set in the specified `BitSet`. |
| int | [cardinality](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#cardinality())() Returns the number of bits set to `true` in this `BitSet`. |
| void | [clear](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#clear(int,%20int))(int fromIndex, int toIndex) Sets the bits from the specified `fromIndex` (inclusive) to the specified `toIndex` (exclusive) to `false`. |
| void | [clear](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#clear(int))(int bitIndex) Sets the bit specified by the index to `false`. |
| void | [clear](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#clear())() Sets all of the bits in this BitSet to `false`. |
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [clone](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#clone())() Cloning this `BitSet` produces a new `BitSet` that is equal to it. |
| boolean | [equals](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#equals(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) obj) Compares this object against the specified object. |
| void | [flip](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#flip(int))(int bitIndex) Sets the bit at the specified index to the complement of its current value. |
| void | [flip](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#flip(int,%20int))(int fromIndex, int toIndex) Sets each bit from the specified `fromIndex` (inclusive) to the specified `toIndex` (exclusive) to the complement of its current value. |
| boolean | [get](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#get(int))(int bitIndex) Returns the value of the bit with the specified index. |
| [BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html) | [get](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#get(int,%20int))(int fromIndex, int toIndex) Returns a new `BitSet` composed of bits from this `BitSet` from `fromIndex` (inclusive) to `toIndex` (exclusive). |
| int | [hashCode](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#hashCode())() Returns the hash code value for this bit set. |
| boolean | [intersects](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#intersects(java.util.BitSet))([BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html) set) Returns true if the specified `BitSet` has any bits set to `true` that are also set to `true` in this `BitSet`. |
| boolean | [isEmpty](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#isEmpty())() Returns true if this `BitSet` contains no bits that are set to `true`. |
| int | [length](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#length())() Returns the "logical size" of this `BitSet`: the index of the highest set bit in the `BitSet` plus one. |
| int | [nextClearBit](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#nextClearBit(int))(int fromIndex) Returns the index of the first bit that is set to `false` that occurs on or after the specified starting index. |
| int | [nextSetBit](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#nextSetBit(int))(int fromIndex) Returns the index of the first bit that is set to `true` that occurs on or after the specified starting index. |
| void | [or](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#or(java.util.BitSet))([BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html) set) Performs a logical **OR** of this bit set with the bit set argument. |
| int | [previousClearBit](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#previousClearBit(int))(int fromIndex) Returns the index of the nearest bit that is set to `false` that occurs on or before the specified starting index. |
| int | [previousSetBit](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#previousSetBit(int))(int fromIndex) Returns the index of the nearest bit that is set to `true` that occurs on or before the specified starting index. |
| void | [set](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#set(int,%20int,%20boolean))(int fromIndex, int toIndex, boolean value) Sets the bits from the specified `fromIndex` (inclusive) to the specified `toIndex` (exclusive) to the specified value. |
| void | [set](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#set(int,%20int))(int fromIndex, int toIndex) Sets the bits from the specified `fromIndex` (inclusive) to the specified `toIndex` (exclusive) to `true`. |
| void | [set](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#set(int))(int bitIndex) Sets the bit at the specified index to `true`. |
| void | [set](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#set(int,%20boolean))(int bitIndex, boolean value) Sets the bit at the specified index to the specified value. |
| int | [size](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#size())() Returns the number of bits of space actually in use by this `BitSet` to represent bit values. |
| [IntStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/stream/IntStream.html) | [stream](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#stream())() Returns a stream of indices for which this `BitSet` contains a bit in the set state. |
| byte\[\] | [toByteArray](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#toByteArray())() Returns a new byte array containing all the bits in this bit set. |
| long\[\] | [toLongArray](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#toLongArray())() Returns a new long array containing all the bits in this bit set. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [toString](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#toString())() Returns a string representation of this bit set. |
| static [BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html) | [valueOf](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#valueOf(long[]))(long\[\] longs) Returns a new bit set containing all the bits in the given long array. |
| static [BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html) | [valueOf](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#valueOf(byte[]))(byte\[\] bytes) Returns a new bit set containing all the bits in the given byte array. |
| static [BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html) | [valueOf](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#valueOf(java.nio.ByteBuffer))([ByteBuffer](https://developers.google.com/j2objc/javadoc/jre/reference/java/nio/ByteBuffer.html) bb) Returns a new bit set containing all the bits in the given byte buffer between its position and limit. |
| static [BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html) | [valueOf](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#valueOf(java.nio.LongBuffer))([LongBuffer](https://developers.google.com/j2objc/javadoc/jre/reference/java/nio/LongBuffer.html) lb) Returns a new bit set containing all the bits in the given long buffer between its position and limit. |
| void | [xor](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#xor(java.util.BitSet))([BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html) set) Performs a logical **XOR** of this bit set with the bit set argument. |
### Inherited Method Summary
From class [java.lang.Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)
|---|---|
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [clone](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#clone())() Creates and returns a copy of this `Object`. |
| boolean | [equals](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#equals(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) obj) Compares this instance with the specified object and indicates if they are equal. |
| void | [finalize](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#finalize())() Invoked when the garbage collector has detected that this instance is no longer reachable. |
| final [Class](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Class.html)\ | [getClass](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#getClass())() Returns the unique instance of `https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Class.html` that represents this object's class. |
| int | [hashCode](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#hashCode())() Returns an integer hash code for this object. |
| final void | [notify](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#notify())() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up. |
| final void | [notifyAll](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#notifyAll())() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [toString](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#toString())() Returns a string containing a concise, human-readable description of this object. |
| final void | [wait](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#wait(long,%20int))(long timeout, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires. |
| final void | [wait](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#wait(long))(long timeout) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires. |
| final void | [wait](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#wait())() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object. |
## Public Constructors
#### public
**BitSet**
()
Creates a new bit set. All bits are initially `false`.
#### public
**BitSet**
(int nbits)
Creates a bit set whose initial size is large enough to explicitly
represent bits with indices in the range `0` through
`nbits-1`. All bits are initially `false`.
##### Parameters
| nbits | the initial size of the bit set |
|---|---|
##### Throws
| [NegativeArraySizeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/NegativeArraySizeException.html) | if the specified initial size is negative |
|---|---|
## Public Methods
#### public void
**and**
([BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html) set)
Performs a logical **AND** of this target bit set with the
argument bit set. This bit set is modified so that each bit in it
has the value `true` if and only if it both initially
had the value `true` and the corresponding bit in the
bit set argument also had the value `true`.
##### Parameters
| set | a bit set |
|---|---|
#### public void
**andNot**
([BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html) set)
Clears all of the bits in this `BitSet` whose corresponding
bit is set in the specified `BitSet`.
##### Parameters
| set | the `BitSet` with which to mask this `BitSet` |
|---|---|
#### public int
**cardinality**
()
Returns the number of bits set to `true` in this `BitSet`.
##### Returns
- the number of bits set to `true` in this `BitSet`
#### public void
**clear**
(int fromIndex, int toIndex)
Sets the bits from the specified `fromIndex` (inclusive) to the
specified `toIndex` (exclusive) to `false`.
##### Parameters
| fromIndex | index of the first bit to be cleared |
| toIndex | index after the last bit to be cleared |
|---|---|
##### Throws
| [IndexOutOfBoundsException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IndexOutOfBoundsException.html) | if `fromIndex` is negative, or `toIndex` is negative, or `fromIndex` is larger than `toIndex` |
|---|---|
#### public void
**clear**
(int bitIndex)
Sets the bit specified by the index to `false`.
##### Parameters
| bitIndex | the index of the bit to be cleared |
|---|---|
##### Throws
| [IndexOutOfBoundsException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IndexOutOfBoundsException.html) | if the specified index is negative |
|---|---|
#### public void
**clear**
()
Sets all of the bits in this BitSet to `false`.
#### public [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)
**clone**
()
Cloning this `BitSet` produces a new `BitSet`
that is equal to it.
The clone of the bit set is another bit set that has exactly the
same bits set to `true` as this bit set.
##### Returns
- a clone of this bit set
##### See Also
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#size()`
#### public boolean
**equals**
([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) obj)
Compares this object against the specified object.
The result is `true` if and only if the argument is
not `null` and is a `Bitset` object that has
exactly the same set of bits set to `true` as this bit
set. That is, for every nonnegative `int` index `k`,
```
((BitSet)obj).get(k) == this.get(k)
```
must be true. The current sizes of the two bit sets are not compared.
##### Parameters
| obj | the object to compare with |
|---|---|
##### Returns
- `true` if the objects are the same; `false` otherwise
##### See Also
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#size()`
#### public void
**flip**
(int bitIndex)
Sets the bit at the specified index to the complement of its
current value.
##### Parameters
| bitIndex | the index of the bit to flip |
|---|---|
##### Throws
| [IndexOutOfBoundsException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IndexOutOfBoundsException.html) | if the specified index is negative |
|---|---|
#### public void
**flip**
(int fromIndex, int toIndex)
Sets each bit from the specified `fromIndex` (inclusive) to the
specified `toIndex` (exclusive) to the complement of its current
value.
##### Parameters
| fromIndex | index of the first bit to flip |
| toIndex | index after the last bit to flip |
|---|---|
##### Throws
| [IndexOutOfBoundsException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IndexOutOfBoundsException.html) | if `fromIndex` is negative, or `toIndex` is negative, or `fromIndex` is larger than `toIndex` |
|---|---|
#### public boolean
**get**
(int bitIndex)
Returns the value of the bit with the specified index. The value
is `true` if the bit with the index `bitIndex`
is currently set in this `BitSet`; otherwise, the result
is `false`.
##### Parameters
| bitIndex | the bit index |
|---|---|
##### Returns
- the value of the bit with the specified index
##### Throws
| [IndexOutOfBoundsException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IndexOutOfBoundsException.html) | if the specified index is negative |
|---|---|
#### public [BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html)
**get**
(int fromIndex, int toIndex)
Returns a new `BitSet` composed of bits from this `BitSet`
from `fromIndex` (inclusive) to `toIndex` (exclusive).
##### Parameters
| fromIndex | index of the first bit to include |
| toIndex | index after the last bit to include |
|---|---|
##### Returns
- a new `BitSet` from a range of this `BitSet`
##### Throws
| [IndexOutOfBoundsException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IndexOutOfBoundsException.html) | if `fromIndex` is negative, or `toIndex` is negative, or `fromIndex` is larger than `toIndex` |
|---|---|
#### public int
**hashCode**
()
Returns the hash code value for this bit set. The hash code depends
only on which bits are set within this `BitSet`.
The hash code is defined to be the result of the following
calculation:
public int hashCode() {
long h = 1234;
long[] words = toLongArray();
for (int i = words.length; --i >= 0; )
h ^= words[i] * (i + 1);
return (int)((h >> 32) ^ h);
}
Note that the hash code changes if the set of bits is altered.
##### Returns
- the hash code value for this bit set
#### public boolean
**intersects**
([BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html) set)
Returns true if the specified `BitSet` has any bits set to
`true` that are also set to `true` in this `BitSet`.
##### Parameters
| set | `BitSet` to intersect with |
|---|---|
##### Returns
- boolean indicating whether this `BitSet` intersects the specified `BitSet`
#### public boolean
**isEmpty**
()
Returns true if this `BitSet` contains no bits that are set
to `true`.
##### Returns
- boolean indicating whether this `BitSet` is empty
#### public int
**length**
()
Returns the "logical size" of this `BitSet`: the index of
the highest set bit in the `BitSet` plus one. Returns zero
if the `BitSet` contains no set bits.
##### Returns
- the logical size of this `BitSet`
#### public int
**nextClearBit**
(int fromIndex)
Returns the index of the first bit that is set to `false`
that occurs on or after the specified starting index.
##### Parameters
| fromIndex | the index to start checking from (inclusive) |
|---|---|
##### Returns
- the index of the next clear bit
##### Throws
| [IndexOutOfBoundsException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IndexOutOfBoundsException.html) | if the specified index is negative |
|---|---|
#### public int
**nextSetBit**
(int fromIndex)
Returns the index of the first bit that is set to `true`
that occurs on or after the specified starting index. If no such
bit exists then `-1` is returned.
To iterate over the `true` bits in a `BitSet`,
use the following loop:
for (int i = bs.nextSetBit(0); i >= 0; i = bs.nextSetBit(i+1)) {
// operate on index i here
if (i == Integer.MAX_VALUE) {
break; // or (i+1) would overflow
}
}
##### Parameters
| fromIndex | the index to start checking from (inclusive) |
|---|---|
##### Returns
- the index of the next set bit, or `-1` if there is no such bit
##### Throws
| [IndexOutOfBoundsException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IndexOutOfBoundsException.html) | if the specified index is negative |
|---|---|
#### public void
**or**
([BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html) set)
Performs a logical **OR** of this bit set with the bit set
argument. This bit set is modified so that a bit in it has the
value `true` if and only if it either already had the
value `true` or the corresponding bit in the bit set
argument has the value `true`.
##### Parameters
| set | a bit set |
|---|---|
#### public int
**previousClearBit**
(int fromIndex)
Returns the index of the nearest bit that is set to `false`
that occurs on or before the specified starting index.
If no such bit exists, or if `-1` is given as the
starting index, then `-1` is returned.
##### Parameters
| fromIndex | the index to start checking from (inclusive) |
|---|---|
##### Returns
- the index of the previous clear bit, or `-1` if there is no such bit
##### Throws
| [IndexOutOfBoundsException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IndexOutOfBoundsException.html) | if the specified index is less than `-1` |
|---|---|
#### public int
**previousSetBit**
(int fromIndex)
Returns the index of the nearest bit that is set to `true`
that occurs on or before the specified starting index.
If no such bit exists, or if `-1` is given as the
starting index, then `-1` is returned.
To iterate over the `true` bits in a `BitSet`,
use the following loop:
for (int i = bs.length(); (i = bs.previousSetBit(i-1)) >= 0; ) {
// operate on index i here
}
##### Parameters
| fromIndex | the index to start checking from (inclusive) |
|---|---|
##### Returns
- the index of the previous set bit, or `-1` if there is no such bit
##### Throws
| [IndexOutOfBoundsException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IndexOutOfBoundsException.html) | if the specified index is less than `-1` |
|---|---|
#### public void
**set**
(int fromIndex, int toIndex, boolean value)
Sets the bits from the specified `fromIndex` (inclusive) to the
specified `toIndex` (exclusive) to the specified value.
##### Parameters
| fromIndex | index of the first bit to be set |
| toIndex | index after the last bit to be set |
| value | value to set the selected bits to |
|---|---|
##### Throws
| [IndexOutOfBoundsException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IndexOutOfBoundsException.html) | if `fromIndex` is negative, or `toIndex` is negative, or `fromIndex` is larger than `toIndex` |
|---|---|
#### public void
**set**
(int fromIndex, int toIndex)
Sets the bits from the specified `fromIndex` (inclusive) to the
specified `toIndex` (exclusive) to `true`.
##### Parameters
| fromIndex | index of the first bit to be set |
| toIndex | index after the last bit to be set |
|---|---|
##### Throws
| [IndexOutOfBoundsException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IndexOutOfBoundsException.html) | if `fromIndex` is negative, or `toIndex` is negative, or `fromIndex` is larger than `toIndex` |
|---|---|
#### public void
**set**
(int bitIndex)
Sets the bit at the specified index to `true`.
##### Parameters
| bitIndex | a bit index |
|---|---|
##### Throws
| [IndexOutOfBoundsException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IndexOutOfBoundsException.html) | if the specified index is negative |
|---|---|
#### public void
**set**
(int bitIndex, boolean value)
Sets the bit at the specified index to the specified value.
##### Parameters
| bitIndex | a bit index |
| value | a boolean value to set |
|---|---|
##### Throws
| [IndexOutOfBoundsException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IndexOutOfBoundsException.html) | if the specified index is negative |
|---|---|
#### public int
**size**
()
Returns the number of bits of space actually in use by this
`BitSet` to represent bit values.
The maximum element in the set is the size - 1st element.
##### Returns
- the number of bits currently in this bit set
#### public [IntStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/stream/IntStream.html)
**stream**
()
Returns a stream of indices for which this `BitSet`
contains a bit in the set state. The indices are returned
in order, from lowest to highest. The size of the stream
is the number of bits in the set state, equal to the value
returned by the `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html#cardinality()` method.
The bit set must remain constant during the execution of the
terminal stream operation. Otherwise, the result of the terminal
stream operation is undefined.
##### Returns
- a stream of integers representing set indices
#### public byte\[\]
**toByteArray**
()
Returns a new byte array containing all the bits in this bit set.
More precisely, if
`byte[] bytes = s.toByteArray();`
then `bytes.length == (s.length()+7)/8` and
`s.get(n) == ((bytes[n/8] & (1<<(n%8))) != 0)`
for all `n < 8 * bytes.length`.
##### Returns
- a byte array containing a little-endian representation of all the bits in this bit set
#### public long\[\]
**toLongArray**
()
Returns a new long array containing all the bits in this bit set.
More precisely, if
`long[] longs = s.toLongArray();`
then `longs.length == (s.length()+63)/64` and
`s.get(n) == ((longs[n/64] & (1L<<(n%64))) != 0)`
for all `n < 64 * longs.length`.
##### Returns
- a long array containing a little-endian representation of all the bits in this bit set
#### public [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)
**toString**
()
Returns a string representation of this bit set. For every index
for which this `BitSet` contains a bit in the set
state, the decimal representation of that index is included in
the result. Such indices are listed in order from lowest to
highest, separated by ", " (a comma and a space) and
surrounded by braces, resulting in the usual mathematical
notation for a set of integers.
Example:
```
BitSet drPepper = new BitSet();
```
Now `drPepper.toString()` returns "`{}`".
```
drPepper.set(2);
```
Now `drPepper.toString()` returns "`{2}`".
```
drPepper.set(4);
drPepper.set(10);
```
Now `drPepper.toString()` returns "`{2, 4, 10}`".
##### Returns
- a string representation of this bit set
#### public static [BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html)
**valueOf**
(long\[\] longs)
Returns a new bit set containing all the bits in the given long array.
More precisely,
`BitSet.valueOf(longs).get(n) == ((longs[n/64] & (1L<<(n%64))) != 0)`
for all `n < 64 * longs.length`.
This method is equivalent to
`BitSet.valueOf(LongBuffer.wrap(longs))`.
##### Parameters
| longs | a long array containing a little-endian representation of a sequence of bits to be used as the initial bits of the new bit set |
|---|---|
##### Returns
- a `BitSet` containing all the bits in the long array
#### public static [BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html)
**valueOf**
(byte\[\] bytes)
Returns a new bit set containing all the bits in the given byte array.
More precisely,
`BitSet.valueOf(bytes).get(n) == ((bytes[n/8] & (1<<(n%8))) != 0)`
for all `n < 8 * bytes.length`.
This method is equivalent to
`BitSet.valueOf(ByteBuffer.wrap(bytes))`.
##### Parameters
| bytes | a byte array containing a little-endian representation of a sequence of bits to be used as the initial bits of the new bit set |
|---|---|
##### Returns
- a `BitSet` containing all the bits in the byte array
#### public static [BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html)
**valueOf**
([ByteBuffer](https://developers.google.com/j2objc/javadoc/jre/reference/java/nio/ByteBuffer.html) bb)
Returns a new bit set containing all the bits in the given byte
buffer between its position and limit.
More precisely,
`BitSet.valueOf(bb).get(n) == ((bb.get(bb.position()+n/8) & (1<<(n%8))) != 0)`
for all `n < 8 * bb.remaining()`.
The byte buffer is not modified by this method, and no
reference to the buffer is retained by the bit set.
##### Parameters
| bb | a byte buffer containing a little-endian representation of a sequence of bits between its position and limit, to be used as the initial bits of the new bit set |
|---|---|
##### Returns
- a `BitSet` containing all the bits in the buffer in the specified range
#### public static [BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html)
**valueOf**
([LongBuffer](https://developers.google.com/j2objc/javadoc/jre/reference/java/nio/LongBuffer.html) lb)
Returns a new bit set containing all the bits in the given long
buffer between its position and limit.
More precisely,
`BitSet.valueOf(lb).get(n) == ((lb.get(lb.position()+n/64) & (1L<<(n%64))) != 0)`
for all `n < 64 * lb.remaining()`.
The long buffer is not modified by this method, and no
reference to the buffer is retained by the bit set.
##### Parameters
| lb | a long buffer containing a little-endian representation of a sequence of bits between its position and limit, to be used as the initial bits of the new bit set |
|---|---|
##### Returns
- a `BitSet` containing all the bits in the buffer in the specified range
#### public void
**xor**
([BitSet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/BitSet.html) set)
Performs a logical **XOR** of this bit set with the bit set
argument. This bit set is modified so that a bit in it has the
value `true` if and only if one of the following
statements holds:
- The bit initially has the value `true`, and the corresponding bit in the argument has the value `false`.
- The bit initially has the value `false`, and the corresponding bit in the argument has the value `true`.
##### Parameters
| set | a bit set |
|---|---|