java.lang.Object | ||
↳ | java.nio.Buffer | |
↳ | java.nio.LongBuffer |
A buffer of longs.
A long buffer can be created in either of the following ways:
Allocate
a new long array and create a buffer
based on it;Wrap
an existing long array to create a new
buffer;ByteBuffer.asLongBuffer
to create a long buffer based on a byte buffer.Public Methods | |||||||||||
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Creates a long buffer based on a newly allocated long array.
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Returns the array that backs this buffer (optional operation).
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Returns the offset into the array returned by
array of the first
element of the buffer (optional operation). | |||||||||||
Returns a read-only buffer that shares its content with this buffer.
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Compacts this long buffer.
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Compare the remaining longs of this buffer to another long buffer's
remaining longs.
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Returns a duplicated buffer that shares its content with this buffer.
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Checks whether this long buffer is equal to another object.
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Returns the long at the specified index; the position is not changed.
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Reads longs from the current position into the specified long array and
increases the position by the number of longs read.
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Reads longs from the current position into the specified long array,
starting from the specified offset, and increase the position by the
number of longs read.
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Returns the long at the current position and increase the position by 1.
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Returns true if
array and arrayOffset won't throw. | |||||||||||
Calculates this buffer's hash code from the remaining chars.
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Indicates whether this buffer is direct.
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Returns the byte order used by this buffer when converting longs from/to
bytes.
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Writes longs from the given long array, starting from the specified
offset, to the current position and increases the position by the number
of longs written.
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Writes longs from the given long array to the current position and
increases the position by the number of longs written.
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Writes all the remaining longs of the
src long buffer to this
buffer's current position, and increases both buffers' position by the
number of longs copied. | |||||||||||
Writes a long to the specified index of this buffer; the position is not
changed.
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Writes the given long to the current position and increases the position
by 1.
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Returns a sliced buffer that shares its content with this buffer.
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Creates a new long buffer by wrapping the given long array.
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Creates a new long buffer by wrapping the given long array.
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[Expand]
Inherited Methods | |||||||||||
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From class
java.nio.Buffer
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From class
java.lang.Object
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From interface
java.lang.Comparable
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Creates a long buffer based on a newly allocated long array.
capacity | the capacity of the new buffer. |
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IllegalArgumentException | if capacity is less than zero.
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Returns the array that backs this buffer (optional operation). The returned value is the actual array, not a copy, so modifications to the array write through to the buffer.
Subclasses should override this method with a covariant return type to provide the exact type of the array.
Use hasArray
to ensure this method won't throw.
(A separate call to isReadOnly
is not necessary.)
Returns the offset into the array returned by array
of the first
element of the buffer (optional operation). The backing array (if there is one)
is not necessarily the same size as the buffer, and position 0 in the buffer is
not necessarily the 0th element in the array. Use
buffer.array()[offset + buffer.arrayOffset()
to access element offset
in buffer
.
Use hasArray
to ensure this method won't throw.
(A separate call to isReadOnly
is not necessary.)
Returns a read-only buffer that shares its content with this buffer.
The returned buffer is guaranteed to be a new instance, even if this buffer is read-only itself. The new buffer's position, limit, capacity and mark are the same as this buffer's.
The new buffer shares its content with this buffer, which means this buffer's change of content will be visible to the new buffer. The two buffer's position, limit and mark are independent.
Compacts this long buffer.
The remaining longs will be moved to the head of the buffer, staring from
position zero. Then the position is set to remaining()
; the
limit is set to capacity; the mark is cleared.
ReadOnlyBufferException | if no changes may be made to the contents of this buffer. |
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Compare the remaining longs of this buffer to another long buffer's remaining longs.
otherBuffer | another long buffer. |
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otherBuffer
; 0 if
this equals to otherBuffer
; a positive value if this is
greater than otherBuffer
ClassCastException | if otherBuffer is not a long buffer.
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Returns a duplicated buffer that shares its content with this buffer.
The duplicated buffer's position, limit, capacity and mark are the same as this buffer. The duplicated buffer's read-only property and byte order are same as this buffer's, too.
The new buffer shares its content with this buffer, which means either buffer's change of content will be visible to the other. The two buffers' position, limit and mark are independent.
Checks whether this long buffer is equal to another object.
If other
is not a long buffer then false
is returned. Two
long buffers are equal if and only if their remaining longs are exactly
the same. Position, limit, capacity and mark are not considered.
other | the object to compare with this long buffer. |
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true
if this long buffer is equal to other
,
false
otherwise.
Returns the long at the specified index; the position is not changed.
index | the index, must not be negative and less than limit. |
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IndexOutOfBoundsException | if index is invalid. |
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Reads longs from the current position into the specified long array and increases the position by the number of longs read.
Calling this method has the same effect as
get(dst, 0, dst.length)
.
dst | the destination long array. |
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BufferUnderflowException | if dst.length is greater than remaining() .
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Reads longs from the current position into the specified long array, starting from the specified offset, and increase the position by the number of longs read.
dst | the target long array. |
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dstOffset | the offset of the long array, must not be negative and not
greater than dst.length . |
longCount | the number of longs to read, must be no less than zero and not
greater than dst.length - dstOffset . |
IndexOutOfBoundsException | if either dstOffset or longCount is invalid. |
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BufferUnderflowException | if longCount is greater than remaining() .
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Returns the long at the current position and increase the position by 1.
BufferUnderflowException | if the position is equal or greater than limit. |
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Returns true if array
and arrayOffset
won't throw. This method does not
return true for buffers not backed by arrays because the other methods would throw
UnsupportedOperationException
, nor does it return true for buffers backed by
read-only arrays, because the other methods would throw ReadOnlyBufferException
.
Calculates this buffer's hash code from the remaining chars. The position, limit, capacity and mark don't affect the hash code.
Indicates whether this buffer is direct. A direct buffer will try its best to take advantage of native memory APIs and it may not stay in the Java heap, so it is not affected by garbage collection.
A long buffer is direct if it is based on a byte buffer and the byte buffer is direct.
true
if this buffer is direct, false
otherwise.
Returns the byte order used by this buffer when converting longs from/to bytes.
If this buffer is not based on a byte buffer, then always return the platform's native byte order.
Writes longs from the given long array, starting from the specified offset, to the current position and increases the position by the number of longs written.
src | the source long array. |
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srcOffset | the offset of long array, must not be negative and not greater
than src.length . |
longCount | the number of longs to write, must be no less than zero and
not greater than src.length - srcOffset . |
BufferOverflowException | if remaining() is less than longCount . |
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IndexOutOfBoundsException | if either srcOffset or longCount is invalid. |
ReadOnlyBufferException | if no changes may be made to the contents of this buffer. |
Writes longs from the given long array to the current position and increases the position by the number of longs written.
Calling this method has the same effect as
put(src, 0, src.length)
.
src | the source long array. |
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BufferOverflowException | if remaining() is less than src.length . |
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ReadOnlyBufferException | if no changes may be made to the contents of this buffer. |
Writes all the remaining longs of the src
long buffer to this
buffer's current position, and increases both buffers' position by the
number of longs copied.
src | the source long buffer. |
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BufferOverflowException | if src.remaining() is greater than this buffer's
remaining() . |
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IllegalArgumentException | if src is this buffer. |
ReadOnlyBufferException | if no changes may be made to the contents of this buffer. |
Writes a long to the specified index of this buffer; the position is not changed.
index | the index, must not be negative and less than the limit. |
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l | the long to write. |
IndexOutOfBoundsException | if index is invalid. |
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ReadOnlyBufferException | if no changes may be made to the contents of this buffer. |
Writes the given long to the current position and increases the position by 1.
l | the long to write. |
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BufferOverflowException | if position is equal or greater than limit. |
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ReadOnlyBufferException | if no changes may be made to the contents of this buffer. |
Returns a sliced buffer that shares its content with this buffer.
The sliced buffer's capacity will be this buffer's remaining()
,
and its zero position will correspond to this buffer's current position.
The new buffer's position will be 0, limit will be its capacity, and its
mark is cleared. The new buffer's read-only property and byte order are
same as this buffer's.
The new buffer shares its content with this buffer, which means either buffer's change of content will be visible to the other. The two buffers' position, limit and mark are independent.
Creates a new long buffer by wrapping the given long array.
The new buffer's position will be start
, limit will be
start + longCount
, capacity will be the length of the array.
array | the long array which the new buffer will be based on. |
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start | the start index, must not be negative and not greater than
array.length . |
longCount | the length, must not be negative and not greater than
array.length - start . |
IndexOutOfBoundsException | if either start or longCount is invalid.
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Creates a new long buffer by wrapping the given long array.
Calling this method has the same effect as
wrap(array, 0, array.length)
.
array | the long array which the new buffer will be based on. |
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