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FloatBuffer (Java SE 21 & JDK 21)

All Implemented Interfaces:

Comparable<FloatBuffer>

A float buffer.

This class defines four categories of operations upon float buffers:

• Absolute and relative get and put methods that read and write single floats;

• Absolute and relative bulk get methods that transfer contiguous sequences of floats from this buffer into an array;

• Absolute and relative bulk put methods that transfer contiguous sequences of floats from a float array or some other float buffer into this buffer;

• A method for compacting a float buffer.

Float buffers can be created either by allocation, which allocates space for the buffer's content, by wrapping an existing float array into a buffer, or by creating a view of an existing byte buffer.

Like a byte buffer, a float buffer is either direct or non-direct. A float buffer created via the wrap methods of this class will be non-direct. A float buffer created as a view of a byte buffer will be direct if, and only if, the byte buffer itself is direct. Whether or not a float buffer is direct may be determined by invoking the isDirect method.

Methods in this class that do not otherwise have a value to return are specified to return the buffer upon which they are invoked. This allows method invocations to be chained.

Methods specified as

throw a

when invoked on a

FloatBuffer. The methods

and

throw an

if the FloatBuffer is not backed by an

(irrespective of whether the FloatBuffer is read-only).

Since:

1.4

• Method Summary

  Allocates a new float buffer.

  final float[]

  Returns the float array that backs this buffer  (optional operation).

  final int

  Returns the offset within this buffer's backing array of the first element of the buffer  (optional operation).

  Creates a new, read-only float buffer that shares this buffer's content.

  Compacts this buffer  (optional operation).

  int

  Compares this buffer to another.

  Creates a new float buffer that shares this buffer's content.

  boolean

  Tells whether or not this buffer is equal to another object.

  abstract float

  Relative bulk get method.

  get(float[] dst, int offset, int length)

  Relative bulk get method.

  abstract float

  get(int index, float[] dst)

  Absolute bulk get method.

  get(int index, float[] dst, int offset, int length)

  Absolute bulk get method.

  final boolean

  Tells whether or not this buffer is backed by an accessible float array.

  int

  Returns the current hash code of this buffer.

  abstract boolean

  Tells whether or not this float buffer is direct.

  Sets this buffer's limit.

  Sets this buffer's mark at its position.

  int

  Finds and returns the relative index of the first mismatch between this buffer and a given buffer.

  Retrieves this buffer's byte order.

  Sets this buffer's position.

  Relative put method  (optional operation).

  Relative bulk put method  (optional operation).

  put(float[] src, int offset, int length)

  Relative bulk put method  (optional operation).

  Absolute put method  (optional operation).

  put(int index, float[] src)

  Absolute bulk put method  (optional operation).

  put(int index, float[] src, int offset, int length)

  Absolute bulk put method  (optional operation).

  Absolute bulk put method  (optional operation).

  Relative bulk put method  (optional operation).

  Resets this buffer's position to the previously-marked position.

  Creates a new float buffer whose content is a shared subsequence of this buffer's content.

  slice(int index, int length)

  Creates a new float buffer whose content is a shared subsequence of this buffer's content.

  Returns a string summarizing the state of this buffer.

  Wraps a float array into a buffer.

  wrap(float[] array, int offset, int length)

  Wraps a float array into a buffer.

• Method Details
  • allocate

    The new buffer's position will be zero, its limit will be its capacity, its mark will be undefined, each of its elements will be initialized to zero, and its byte order will be the native order of the underlying hardware. It will have a backing array, and its array offset will be zero.

    Parameters:

    capacity - The new buffer's capacity, in floats

    Returns:

    The new float buffer

    Throws:

    IllegalArgumentException - If the capacity is a negative integer

  • wrap public static FloatBuffer wrap(float[] array, int offset, int length)

    The new buffer will be backed by the given float array; that is, modifications to the buffer will cause the array to be modified and vice versa. The new buffer's capacity will be array.length, its position will be offset, its limit will be offset + length, its mark will be undefined, and its byte order will be the native order of the underlying hardware. Its backing array will be the given array, and its array offset will be zero.

    Parameters:

    array - The array that will back the new buffer

    offset - The offset of the subarray to be used; must be non-negative and no larger than array.length. The new buffer's position will be set to this value.

    length - The length of the subarray to be used; must be non-negative and no larger than array.length - offset. The new buffer's limit will be set to offset + length.

    Returns:

    The new float buffer

    Throws:

    IndexOutOfBoundsException - If the preconditions on the offset and length parameters do not hold

  • wrap

    The new buffer will be backed by the given float array; that is, modifications to the buffer will cause the array to be modified and vice versa. The new buffer's capacity and limit will be array.length, its position will be zero, its mark will be undefined, and its byte order will be the native order of the underlying hardware. Its backing array will be the given array, and its array offset will be zero.

    Parameters:

    array - The array that will back this buffer

    Returns:

    The new float buffer

  • slice

    Creates a new float buffer whose content is a shared subsequence of this buffer's content.

    The content of the new buffer will start at this buffer's current position. Changes to this buffer's content will be visible in the new buffer, and vice versa; the two buffers' position, limit, and mark values will be independent.

    The new buffer's position will be zero, its capacity and its limit will be the number of floats remaining in this buffer, its mark will be undefined, and its byte order will be identical to that of this buffer. The new buffer will be direct if, and only if, this buffer is direct, and it will be read-only if, and only if, this buffer is read-only.

    Specified by:

    slice in class Buffer

    Returns:

    The new float buffer

  • slice public abstract FloatBuffer slice(int index, int length)

    Creates a new float buffer whose content is a shared subsequence of this buffer's content.

    The content of the new buffer will start at position index in this buffer, and will contain length elements. Changes to this buffer's content will be visible in the new buffer, and vice versa; the two buffers' position, limit, and mark values will be independent.

    The new buffer's position will be zero, its capacity and its limit will be length, its mark will be undefined, and its byte order will be identical to that of this buffer. The new buffer will be direct if, and only if, this buffer is direct, and it will be read-only if, and only if, this buffer is read-only.

    Specified by:

    slice in class Buffer

    Parameters:

    index - The position in this buffer at which the content of the new buffer will start; must be non-negative and no larger than limit()

    length - The number of elements the new buffer will contain; must be non-negative and no larger than limit() - index

    Returns:

    The new buffer

    Throws:

    IndexOutOfBoundsException - If index is negative or greater than limit(), length is negative, or length > limit() - index

    Since:

    13

  • duplicate

    Creates a new float buffer that shares this buffer's content.

    The content of the new buffer will be that of this buffer. Changes to this buffer's content will be visible in the new buffer, and vice versa; the two buffers' position, limit, and mark values will be independent.

    The new buffer's capacity, limit, position, mark values, and byte order will be identical to those of this buffer. The new buffer will be direct if, and only if, this buffer is direct, and it will be read-only if, and only if, this buffer is read-only.

    Specified by:

    duplicate in class Buffer

    Returns:

    The new float buffer

  • asReadOnlyBuffer

    Creates a new, read-only float buffer that shares this buffer's content.

    The content of the new buffer will be that of this buffer. Changes to this buffer's content will be visible in the new buffer; the new buffer itself, however, will be read-only and will not allow the shared content to be modified. The two buffers' position, limit, and mark values will be independent.

    The new buffer's capacity, limit, position, mark values, and byte order will be identical to those of this buffer.

    If this buffer is itself read-only then this method behaves in exactly the same way as the duplicate method.

    Returns:

    The new, read-only float buffer

  • get

    public abstract float get()

    Relative get method. Reads the float at this buffer's current position, and then increments the position.

    Returns:

    The float at the buffer's current position

    Throws:

    BufferUnderflowException - If the buffer's current position is not smaller than its limit

  • put

    Relative

    put

    method

    (optional operation)

    .

    Writes the given float into this buffer at the current position, and then increments the position.

    Parameters:

    f - The float to be written

    Returns:

    This buffer

    Throws:

    BufferOverflowException - If this buffer's current position is not smaller than its limit

    ReadOnlyBufferException - If this buffer is read-only

  • get

    public abstract float get(int index)

    Absolute get method. Reads the float at the given index.

    Parameters:

    index - The index from which the float will be read

    Returns:

    The float at the given index

    Throws:

    IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit

  • put

    Absolute

    put

    method

    (optional operation)

    .

    Writes the given float into this buffer at the given index.

    Parameters:

    index - The index at which the float will be written

    f - The float value to be written

    Returns:

    This buffer

    Throws:

    IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit

    ReadOnlyBufferException - If this buffer is read-only

  • get public FloatBuffer get(float[] dst, int offset, int length)

    Relative bulk

    get

    method.

    This method transfers floats from this buffer into the given destination array. If there are fewer floats remaining in the buffer than are required to satisfy the request, that is, if length > remaining(), then no floats are transferred and a BufferUnderflowException is thrown.

    Otherwise, this method copies length floats from this buffer into the given array, starting at the current position of this buffer and at the given offset in the array. The position of this buffer is then incremented by length.

    In other words, an invocation of this method of the form src.get(dst, off, len) has exactly the same effect as the loop

        for (int i = off; i < off + len; i++)
            dst[i] = src.get();
    

    except that it first checks that there are sufficient floats in this buffer and it is potentially much more efficient.

    Parameters:

    dst - The array into which floats are to be written

    offset - The offset within the array of the first float to be written; must be non-negative and no larger than dst.length

    length - The maximum number of floats to be written to the given array; must be non-negative and no larger than dst.length - offset

    Returns:

    This buffer

    Throws:

    BufferUnderflowException - If there are fewer than length floats remaining in this buffer

    IndexOutOfBoundsException - If the preconditions on the offset and length parameters do not hold

  • get

    Relative bulk

    get

    method.

    This method transfers floats from this buffer into the given destination array. An invocation of this method of the form src.get(a) behaves in exactly the same way as the invocation

    Parameters:

    dst - The destination array

    Returns:

    This buffer

    Throws:

    BufferUnderflowException - If there are fewer than length floats remaining in this buffer

  • get public FloatBuffer get(int index, float[] dst, int offset, int length)

    Absolute bulk

    get

    method.

    This method transfers length floats from this buffer into the given array, starting at the given index in this buffer and at the given offset in the array. The position of this buffer is unchanged.

    An invocation of this method of the form src.get(index, dst, offset, length) has exactly the same effect as the following loop except that it first checks the consistency of the supplied parameters and it is potentially much more efficient:

        for (int i = offset, j = index; i < offset + length; i++, j++)
            dst[i] = src.get(j);
    

    Parameters:

    index - The index in this buffer from which the first float will be read; must be non-negative and less than limit()

    dst - The destination array

    offset - The offset within the array of the first float to be written; must be non-negative and less than dst.length

    length - The number of floats to be written to the given array; must be non-negative and no larger than the smaller of limit() - index and dst.length - offset

    Returns:

    This buffer

    Throws:

    IndexOutOfBoundsException - If the preconditions on the index, offset, and length parameters do not hold

    Since:

    13

  • get

    Absolute bulk

    get

    method.

    This method transfers floats from this buffer into the given destination array. The position of this buffer is unchanged. An invocation of this method of the form src.get(index, dst) behaves in exactly the same way as the invocation:

        src.get(index, dst, 0, dst.length)
    

    Parameters:

    index - The index in this buffer from which the first float will be read; must be non-negative and less than limit()

    dst - The destination array

    Returns:

    This buffer

    Throws:

    IndexOutOfBoundsException - If index is negative, not smaller than limit(), or limit() - index < dst.length

    Since:

    13

  • put

    Relative bulk

    put

    method

    (optional operation)

    .

    This method transfers the floats remaining in the given source buffer into this buffer. If there are more floats remaining in the source buffer than in this buffer, that is, if src.remaining() > remaining(), then no floats are transferred and a BufferOverflowException is thrown.

    Otherwise, this method copies n = src.remaining() floats from the given buffer into this buffer, starting at each buffer's current position. The positions of both buffers are then incremented by n.

    In other words, an invocation of this method of the form dst.put(src) has exactly the same effect as the loop

        while (src.hasRemaining())
            dst.put(src.get());
    

    except that it first checks that there is sufficient space in this buffer and it is potentially much more efficient. If this buffer and the source buffer share the same backing array or memory, then the result will be as if the source elements were first copied to an intermediate location before being written into this buffer.

    Parameters:

    src - The source buffer from which floats are to be read; must not be this buffer

    Returns:

    This buffer

    Throws:

    BufferOverflowException - If there is insufficient space in this buffer for the remaining floats in the source buffer

    IllegalArgumentException - If the source buffer is this buffer

    ReadOnlyBufferException - If this buffer is read-only

  • put

    Absolute bulk

    put

    method

    (optional operation)

    .

    This method transfers length floats into this buffer from the given source buffer, starting at the given offset in the source buffer and the given index in this buffer. The positions of both buffers are unchanged.

    In other words, an invocation of this method of the form dst.put(index, src, offset, length) has exactly the same effect as the loop

        for (int i = offset, j = index; i < offset + length; i++, j++)
            dst.put(j, src.get(i));
    

    except that it first checks the consistency of the supplied parameters and it is potentially much more efficient. If this buffer and the source buffer share the same backing array or memory, then the result will be as if the source elements were first copied to an intermediate location before being written into this buffer.

    Parameters:

    index - The index in this buffer at which the first float will be written; must be non-negative and less than limit()

    src - The buffer from which floats are to be read

    offset - The index within the source buffer of the first float to be read; must be non-negative and less than src.limit()

    length - The number of floats to be read from the given buffer; must be non-negative and no larger than the smaller of limit() - index and src.limit() - offset

    Returns:

    This buffer

    Throws:

    IndexOutOfBoundsException - If the preconditions on the index, offset, and length parameters do not hold

    ReadOnlyBufferException - If this buffer is read-only

    Since:

    16

  • put public FloatBuffer put(float[] src, int offset, int length)

    Relative bulk

    put

    method

    (optional operation)

    .

    This method transfers floats into this buffer from the given source array. If there are more floats to be copied from the array than remain in this buffer, that is, if length > remaining(), then no floats are transferred and a BufferOverflowException is thrown.

    Otherwise, this method copies length floats from the given array into this buffer, starting at the given offset in the array and at the current position of this buffer. The position of this buffer is then incremented by length.

    In other words, an invocation of this method of the form dst.put(src, off, len) has exactly the same effect as the loop

        for (int i = off; i < off + len; i++)
            dst.put(src[i]);
    

    except that it first checks that there is sufficient space in this buffer and it is potentially much more efficient.

    Parameters:

    src - The array from which floats are to be read

    offset - The offset within the array of the first float to be read; must be non-negative and no larger than src.length

    length - The number of floats to be read from the given array; must be non-negative and no larger than src.length - offset

    Returns:

    This buffer

    Throws:

    BufferOverflowException - If there is insufficient space in this buffer

    IndexOutOfBoundsException - If the preconditions on the offset and length parameters do not hold

    ReadOnlyBufferException - If this buffer is read-only

  • put

    Relative bulk

    put

    method

    (optional operation)

    .

    This method transfers the entire content of the given source float array into this buffer. An invocation of this method of the form dst.put(a) behaves in exactly the same way as the invocation

    Parameters:

    src - The source array

    Returns:

    This buffer

    Throws:

    BufferOverflowException - If there is insufficient space in this buffer

    ReadOnlyBufferException - If this buffer is read-only

  • put public FloatBuffer put(int index, float[] src, int offset, int length)

    Absolute bulk

    put

    method

    (optional operation)

    .

    This method transfers length floats from the given array, starting at the given offset in the array and at the given index in this buffer. The position of this buffer is unchanged.

    An invocation of this method of the form dst.put(index, src, offset, length) has exactly the same effect as the following loop except that it first checks the consistency of the supplied parameters and it is potentially much more efficient:

        for (int i = offset, j = index; i < offset + length; i++, j++)
            dst.put(j, src[i]);
    

    Parameters:

    index - The index in this buffer at which the first float will be written; must be non-negative and less than limit()

    src - The array from which floats are to be read

    offset - The offset within the array of the first float to be read; must be non-negative and less than src.length

    length - The number of floats to be read from the given array; must be non-negative and no larger than the smaller of limit() - index and src.length - offset

    Returns:

    This buffer

    Throws:

    IndexOutOfBoundsException - If the preconditions on the index, offset, and length parameters do not hold

    ReadOnlyBufferException - If this buffer is read-only

    Since:

    13

  • put

    Absolute bulk

    put

    method

    (optional operation)

    .

    This method copies floats into this buffer from the given source array. The position of this buffer is unchanged. An invocation of this method of the form dst.put(index, src) behaves in exactly the same way as the invocation:

        dst.put(index, src, 0, src.length);
    

    Parameters:

    index - The index in this buffer at which the first float will be written; must be non-negative and less than limit()

    src - The array from which floats are to be read

    Returns:

    This buffer

    Throws:

    IndexOutOfBoundsException - If index is negative, not smaller than limit(), or limit() - index < src.length

    ReadOnlyBufferException - If this buffer is read-only

    Since:

    13

  • hasArray

    public final boolean hasArray()

    If this method returns true then the array and arrayOffset methods may safely be invoked.

    Specified by:

    hasArray in class Buffer

    Returns:

    true if, and only if, this buffer is backed by an array and is not read-only

  • array

    public final float[] array()

    Returns the float array that backs this buffer

    (optional operation)

    .

    Modifications to this buffer's content will cause the returned array's content to be modified, and vice versa.

    Invoke the hasArray method before invoking this method in order to ensure that this buffer has an accessible backing array.

    Specified by:

    array in class Buffer

    Returns:

    The array that backs this buffer

    Throws:

    ReadOnlyBufferException - If this buffer is backed by an array but is read-only

    UnsupportedOperationException - If this buffer is not backed by an accessible array

  • arrayOffset

    public final int arrayOffset()

    Returns the offset within this buffer's backing array of the first element of the buffer

    (optional operation)

    .

    If this buffer is backed by an array then buffer position p corresponds to array index p + arrayOffset().

    Invoke the hasArray method before invoking this method in order to ensure that this buffer has an accessible backing array.

    Specified by:

    arrayOffset in class Buffer

    Returns:

    The offset within this buffer's array of the first element of the buffer

    Throws:

    ReadOnlyBufferException - If this buffer is backed by an array but is read-only

    UnsupportedOperationException - If this buffer is not backed by an accessible array

  • position

    Sets this buffer's position. If the mark is defined and larger than the new position then it is discarded.

    Overrides:

    position in class Buffer

    Parameters:

    newPosition - The new position value; must be non-negative and no larger than the current limit

    Returns:

    This buffer

    Since:

    9

  • limit

    Sets this buffer's limit. If the position is larger than the new limit then it is set to the new limit. If the mark is defined and larger than the new limit then it is discarded.

    Overrides:

    limit in class Buffer

    Parameters:

    newLimit - The new limit value; must be non-negative and no larger than this buffer's capacity

    Returns:

    This buffer

    Since:

    9

  • mark

    Sets this buffer's mark at its position.

    Overrides:

    mark in class Buffer

    Returns:

    This buffer

    Since:

    9

  • reset

    Invoking this method neither changes nor discards the mark's value.

    Overrides:

    reset in class Buffer

    Returns:

    This buffer

    Since:

    9

  • clear

    Clears this buffer. The position is set to zero, the limit is set to the capacity, and the mark is discarded.

    Invoke this method before using a sequence of channel-read or put operations to fill this buffer. For example:

        buf.clear();     // Prepare buffer for reading
        in.read(buf);    // Read data
    

    This method does not actually erase the data in the buffer, but it is named as if it did because it will most often be used in situations in which that might as well be the case.

    Overrides:

    clear in class Buffer

    Returns:

    This buffer

    Since:

    9

  • flip

    Flips this buffer. The limit is set to the current position and then the position is set to zero. If the mark is defined then it is discarded.

    After a sequence of channel-read or put operations, invoke this method to prepare for a sequence of channel-write or relative get operations. For example:

        buf.put(magic);    // Prepend header
        in.read(buf);      // Read data into rest of buffer
        buf.flip();        // Flip buffer
        out.write(buf);    // Write header + data to channel
    

    This method is often used in conjunction with the compact method when transferring data from one place to another.

    Overrides:

    flip in class Buffer

    Returns:

    This buffer

    Since:

    9

  • rewind

    Rewinds this buffer. The position is set to zero and the mark is discarded.

    Invoke this method before a sequence of channel-write or get operations, assuming that the limit has already been set appropriately. For example:

        out.write(buf);    // Write remaining data
        buf.rewind();      // Rewind buffer
        buf.get(array);    // Copy data into array
    

    Overrides:

    rewind in class Buffer

    Returns:

    This buffer

    Since:

    9

  • compact

    Compacts this buffer

    (optional operation)

    .

    The floats between the buffer's current position and its limit, if any, are copied to the beginning of the buffer. That is, the float at index p = position() is copied to index zero, the float at index p + 1 is copied to index one, and so forth until the float at index limit() - 1 is copied to index n = limit() - 1 - p. The buffer's position is then set to n+1 and its limit is set to its capacity. The mark, if defined, is discarded.

    The buffer's position is set to the number of floats copied, rather than to zero, so that an invocation of this method can be followed immediately by an invocation of another relative put method.

    Returns:

    This buffer

    Throws:

    ReadOnlyBufferException - If this buffer is read-only

  • isDirect

    public abstract boolean isDirect()

    Tells whether or not this float buffer is direct.

    Specified by:

    isDirect in class Buffer

    Returns:

    true if, and only if, this buffer is direct

  • toString

    Returns a string summarizing the state of this buffer.

    Overrides:

    toString in class Object

    Returns:

    A summary string

  • hashCode

    public int hashCode()

    Returns the current hash code of this buffer.

    The hash code of a float buffer depends only upon its remaining elements; that is, upon the elements from position() up to, and including, the element at limit() - 1.

    Because buffer hash codes are content-dependent, it is inadvisable to use buffers as keys in hash maps or similar data structures unless it is known that their contents will not change.

    Overrides:

    hashCode in class Object

    Returns:

    The current hash code of this buffer

    See Also:

    • Object.equals(java.lang.Object)
    • System.identityHashCode(java.lang.Object)

  • equals public boolean equals(Object ob)

    Tells whether or not this buffer is equal to another object.

    Two float buffers are equal if, and only if,

    1. They have the same element type,

    2. They have the same number of remaining elements, and

    3. The two sequences of remaining elements, considered independently of their starting positions, are pointwise equal. This method considers two float elements a and b to be equal if (a == b) || (Float.isNaN(a) && Float.isNaN(b)). The values -0.0 and +0.0 are considered to be equal, unlike Float.equals(Object).

    A float buffer is not equal to any other type of object.

    Overrides:

    equals in class Object

    Parameters:

    ob - The object to which this buffer is to be compared

    Returns:

    true if, and only if, this buffer is equal to the given object

    See Also:

    • Object.hashCode()
    • HashMap

  • compareTo

    Compares this buffer to another.

    Two float buffers are compared by comparing their sequences of remaining elements lexicographically, without regard to the starting position of each sequence within its corresponding buffer. Pairs of float elements are compared as if by invoking Float.compare(float,float), except that -0.0 and 0.0 are considered to be equal. Float.NaN is considered by this method to be equal to itself and greater than all other float values (including Float.POSITIVE_INFINITY).

    A float buffer is not comparable to any other type of object.

    Specified by:

    compareTo in interface Comparable<FloatBuffer>

    Parameters:

    that - the object to be compared.

    Returns:

    A negative integer, zero, or a positive integer as this buffer is less than, equal to, or greater than the given buffer

  • mismatch

    Finds and returns the relative index of the first mismatch between this buffer and a given buffer. The index is relative to the

    position

    of each buffer and will be in the range of 0 (inclusive) up to the smaller of the

    remaining

    elements in each buffer (exclusive).

    If the two buffers share a common prefix then the returned index is the length of the common prefix and it follows that there is a mismatch between the two buffers at that index within the respective buffers. If one buffer is a proper prefix of the other then the returned index is the smaller of the remaining elements in each buffer, and it follows that the index is only valid for the buffer with the larger number of remaining elements. Otherwise, there is no mismatch.

    Parameters:

    that - The byte buffer to be tested for a mismatch with this buffer

    Returns:

    The relative index of the first mismatch between this and the given buffer, otherwise -1 if no mismatch.

    Since:

    11

  • order

    The byte order of a float buffer created by allocation or by wrapping an existing float array is the native order of the underlying hardware. The byte order of a float buffer created as a view of a byte buffer is that of the byte buffer at the moment that the view is created.

    Returns:

    This buffer's byte order

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