java.lang.Object | ||
↳ | java.nio.Buffer | |
↳ | java.nio.DoubleBuffer |
A buffer of doubles.
A double buffer can be created in either one of the following ways:
Allocate
a new double array and create a buffer
based on it;Wrap
an existing double array to create a new
buffer;ByteBuffer.asDoubleBuffer
to
create a double buffer based on a byte buffer.Public Methods | |||||||||||
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Creates a double buffer based on a newly allocated double 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 double buffer.
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Compare the remaining doubles of this buffer to another double buffer's
remaining doubles.
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Returns a duplicated buffer that shares its content with this buffer.
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Checks whether this double buffer is equal to another object.
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Returns a double at the specified index; the position is not changed.
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Reads doubles from the current position into the specified double array,
starting from the specified offset, and increases the position by the
number of doubles read.
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Reads doubles from the current position into the specified double array
and increases the position by the number of doubles read.
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Returns the double at the current position and increases 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 doubles
from/to bytes.
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Writes doubles from the given double array, starting from the specified
offset, to the current position and increases the position by the number
of doubles written.
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Writes all the remaining doubles of the
src double buffer to this
buffer's current position, and increases both buffers' position by the
number of doubles copied. | |||||||||||
Write a double to the specified index of this buffer and the position is
not changed.
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Writes doubles from the given double array to the current position and
increases the position by the number of doubles written.
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Writes the given double 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 double buffer by wrapping the given double array.
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Creates a new double buffer by wrapping the given double 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 double buffer based on a newly allocated double 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 that 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 double buffer.
The remaining doubles 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 doubles of this buffer to another double buffer's remaining doubles.
otherBuffer | another double buffer. |
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other
; 0 if this
equals to other
; a positive value if this is greater
than other
.ClassCastException | if other is not a double 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's. The duplicated buffer's read-only property and byte order are the 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 double buffer is equal to another object. If other
is not a DoubleBuffer
then false
is returned.
Two double buffers are equal if their remaining doubles are equal. Position, limit, capacity and mark are not considered.
This method considers two doubles a
and b
to be equal
if a == b
or if a
and b
are both NaN
.
Unlike equals(Object)
, this method considers -0.0
and
+0.0
to be equal.
other | the object to compare with this double buffer. |
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true
if this double buffer is equal to other
,
false
otherwise.
Returns a double 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 doubles from the current position into the specified double array, starting from the specified offset, and increases the position by the number of doubles read.
dst | the target double array. |
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dstOffset | the offset of the double array, must not be negative and not
greater than dst.length . |
doubleCount | the number of doubles to read, must be no less than zero and
not greater than dst.length - dstOffset . |
IndexOutOfBoundsException | if either dstOffset or doubleCount is invalid. |
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BufferUnderflowException | if doubleCount is greater than remaining() .
|
Reads doubles from the current position into the specified double array and increases the position by the number of doubles read.
Calling this method has the same effect as
get(dst, 0, dst.length)
.
dst | the destination double array. |
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BufferUnderflowException | if dst.length is greater than remaining() .
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Returns the double at the current position and increases 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 double 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 doubles from/to bytes.
If this buffer is not based on a byte buffer, then this always returns the platform's native byte order.
Writes doubles from the given double array, starting from the specified offset, to the current position and increases the position by the number of doubles written.
src | the source double array. |
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srcOffset | the offset of double array, must not be negative and not
greater than src.length . |
doubleCount | the number of doubles to write, must be no less than zero and
not greater than src.length - srcOffset . |
BufferOverflowException | if remaining() is less than doubleCount . |
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IndexOutOfBoundsException | if either srcOffset or doubleCount is invalid. |
ReadOnlyBufferException | if no changes may be made to the contents of this buffer. |
Writes all the remaining doubles of the src
double buffer to this
buffer's current position, and increases both buffers' position by the
number of doubles copied.
src | the source double 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. |
Write a double to the specified index of this buffer and the position is not changed.
index | the index, must not be negative and less than the limit. |
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d | the double 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 doubles from the given double array to the current position and increases the position by the number of doubles written.
Calling this method has the same effect as
put(src, 0, src.length)
.
src | the source double 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 the given double to the current position and increases the position by 1.
d | the double 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
the 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 double buffer by wrapping the given double array.
The new buffer's position will be start
, limit will be
start + doubleCount
, capacity will be the length of the array.
array | the double 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 . |
doubleCount | the length, must not be negative and not greater than
array.length - start . |
IndexOutOfBoundsException | if either start or doubleCount is invalid.
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Creates a new double buffer by wrapping the given double array.
Calling this method has the same effect as
wrap(array, 0, array.length)
.
array | the double array which the new buffer will be based on. |
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