public abstract classByteBufferextendsBufferimplementsComparable<ByteBuffer>
This class defines six categories of operations upon byte buffers:
Absolute and relativeget andput methods that read and write single bytes;
Relativebulk get methods that transfer contiguous sequences of bytes from this buffer into an array;
Relativebulk put methods that transfer contiguous sequences of bytes from a byte array or some other byte buffer into this buffer;
Absolute and relativeget andput methods that read and write values of other primitive types, translating them to and from sequences of bytes in a particular byte order;
Methods for creatingview buffers, which allow a byte buffer to be viewed as a buffer containing values of some other primitive type; and
Methods forcompacting,duplicating, andslicing a byte buffer.
Byte buffers can be created either byallocation, which allocates space for the buffer's content, or bywrapping an existing byte array into a buffer.
A byte buffer is eitherdirect ornon-direct. Given a direct byte buffer, the Java virtual machine will make a best effort to perform native I/O operations directly upon it. That is, it will attempt to avoid copying the buffer's content to (or from) an intermediate buffer before (or after) each invocation of one of the underlying operating system's native I/O operations.
A direct byte buffer may be created by invoking theallocateDirect factory method of this class. The buffers returned by this method typically have somewhat higher allocation and deallocation costs than non-direct buffers. The contents of direct buffers may reside outside of the normal garbage-collected heap, and so their impact upon the memory footprint of an application might not be obvious. It is therefore recommended that direct buffers be allocated primarily for large, long-lived buffers that are subject to the underlying system's native I/O operations. In general it is best to allocate direct buffers only when they yield a measureable gain in program performance.
A direct byte buffer may also be created bymapping a region of a file directly into memory. An implementation of the Java platform may optionally support the creation of direct byte buffers from native code via JNI. If an instance of one of these kinds of buffers refers to an inaccessible region of memory then an attempt to access that region will not change the buffer's content and will cause an unspecified exception to be thrown either at the time of the access or at some later time.
Whether a byte buffer is direct or non-direct may be determined by invoking itsisDirect method. This method is provided so that explicit buffer management can be done in performance-critical code.
This class defines methods for reading and writing values of all other primitive types, exceptboolean. Primitive values are translated to (or from) sequences of bytes according to the buffer's current byte order, which may be retrieved and modified via theorder methods. Specific byte orders are represented by instances of theByteOrder class. The initial order of a byte buffer is alwaysBIG_ENDIAN.
For access to heterogeneous binary data, that is, sequences of values of different types, this class defines a family of absolute and relativeget andput methods for each type. For 32-bit floating-point values, for example, this class defines:
floatgetFloat()floatgetFloat(int index)voidputFloat(float f)voidputFloat(int index, float f)
Corresponding methods are defined for the typeschar,short,int,long, anddouble. The index parameters of the absoluteget andput methods are in terms of bytes rather than of the type being read or written.
For access to homogeneous binary data, that is, sequences of values of the same type, this class defines methods that can createviews of a given byte buffer. Aview buffer is simply another buffer whose content is backed by the byte buffer. Changes to the byte buffer's content will be visible in the view buffer, and vice versa; the two buffers' position, limit, and mark values are independent. TheasFloatBuffer method, for example, creates an instance of theFloatBuffer class that is backed by the byte buffer upon which the method is invoked. Corresponding view-creation methods are defined for the typeschar,short,int,long, anddouble.
View buffers have three important advantages over the families of type-specificget andput methods described above:
A view buffer is indexed not in terms of bytes but rather in terms of the type-specific size of its values;
A view buffer provides relative bulkget andput methods that can transfer contiguous sequences of values between a buffer and an array or some other buffer of the same type; and
A view buffer is potentially much more efficient because it will be direct if, and only if, its backing byte buffer is direct.
The byte order of a view buffer is fixed to be that of its byte buffer at the time that the view is created.
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. The sequence of statements
can, for example, be replaced by the single statementbb.putInt(0xCAFEBABE); bb.putShort(3); bb.putShort(45);
bb.putInt(0xCAFEBABE).putShort(3).putShort(45);
| Modifier and Type | Method | Description |
|---|---|---|
staticByteBuffer | allocate(int capacity) | Allocates a new byte buffer. |
staticByteBuffer | allocateDirect(int capacity) | Allocates a new direct byte buffer. |
byte[] | array() | Returns the byte array that backs this buffer (optional operation). |
int | arrayOffset() | Returns the offset within this buffer's backing array of the first element of the buffer (optional operation). |
abstractCharBuffer | asCharBuffer() | Creates a view of this byte buffer as a char buffer. |
abstractDoubleBuffer | asDoubleBuffer() | Creates a view of this byte buffer as a double buffer. |
abstractFloatBuffer | asFloatBuffer() | Creates a view of this byte buffer as a float buffer. |
abstractIntBuffer | asIntBuffer() | Creates a view of this byte buffer as an int buffer. |
abstractLongBuffer | asLongBuffer() | Creates a view of this byte buffer as a long buffer. |
abstractByteBuffer | asReadOnlyBuffer() | Creates a new, read-only byte buffer that shares this buffer's content. |
abstractShortBuffer | asShortBuffer() | Creates a view of this byte buffer as a short buffer. |
abstractByteBuffer | compact() | Compacts this buffer (optional operation). |
int | compareTo(ByteBuffer that) | Compares this buffer to another. |
abstractByteBuffer | duplicate() | Creates a new byte buffer that shares this buffer's content. |
boolean | equals(Object ob) | Tells whether or not this buffer is equal to another object. |
abstract byte | get() | Relativeget method. |
ByteBuffer | get(byte[] dst) | Relative bulkget method. |
ByteBuffer | get(byte[] dst, int offset, int length) | Relative bulkget method. |
abstract byte | get(int index) | Absoluteget method. |
abstract char | getChar() | Relativeget method for reading a char value. |
abstract char | getChar(int index) | Absoluteget method for reading a char value. |
abstract double | getDouble() | Relativeget method for reading a double value. |
abstract double | getDouble(int index) | Absoluteget method for reading a double value. |
abstract float | getFloat() | Relativeget method for reading a float value. |
abstract float | getFloat(int index) | Absoluteget method for reading a float value. |
abstract int | getInt() | Relativeget method for reading an int value. |
abstract int | getInt(int index) | Absoluteget method for reading an int value. |
abstract long | getLong() | Relativeget method for reading a long value. |
abstract long | getLong(int index) | Absoluteget method for reading a long value. |
abstract short | getShort() | Relativeget method for reading a short value. |
abstract short | getShort(int index) | Absoluteget method for reading a short value. |
boolean | hasArray() | Tells whether or not this buffer is backed by an accessible byte array. |
int | hashCode() | Returns the current hash code of this buffer. |
abstract boolean | isDirect() | Tells whether or not this byte buffer is direct. |
ByteOrder | order() | Retrieves this buffer's byte order. |
ByteBuffer | order(ByteOrder bo) | Modifies this buffer's byte order. |
abstractByteBuffer | put(byte b) | Relativeput method (optional operation). |
ByteBuffer | put(byte[] src) | Relative bulkput method (optional operation). |
ByteBuffer | put(byte[] src, int offset, int length) | Relative bulkput method (optional operation). |
ByteBuffer | put(ByteBuffer src) | Relative bulkput method (optional operation). |
abstractByteBuffer | put(int index, byte b) | Absoluteput method (optional operation). |
abstractByteBuffer | putChar(char value) | Relativeput method for writing a char value (optional operation). |
abstractByteBuffer | putChar(int index, char value) | Absoluteput method for writing a char value (optional operation). |
abstractByteBuffer | putDouble(double value) | Relativeput method for writing a double value (optional operation). |
abstractByteBuffer | putDouble(int index, double value) | Absoluteput method for writing a double value (optional operation). |
abstractByteBuffer | putFloat(float value) | Relativeput method for writing a float value (optional operation). |
abstractByteBuffer | putFloat(int index, float value) | Absoluteput method for writing a float value (optional operation). |
abstractByteBuffer | putInt(int value) | Relativeput method for writing an int value (optional operation). |
abstractByteBuffer | putInt(int index, int value) | Absoluteput method for writing an int value (optional operation). |
abstractByteBuffer | putLong(int index, long value) | Absoluteput method for writing a long value (optional operation). |
abstractByteBuffer | putLong(long value) | Relativeput method for writing a long value (optional operation). |
abstractByteBuffer | putShort(int index, short value) | Absoluteput method for writing a short value (optional operation). |
abstractByteBuffer | putShort(short value) | Relativeput method for writing a short value (optional operation). |
abstractByteBuffer | slice() | Creates a new byte buffer whose content is a shared subsequence of this buffer's content. |
String | toString() | Returns a string summarizing the state of this buffer. |
staticByteBuffer | wrap(byte[] array) | Wraps a byte array into a buffer. |
staticByteBuffer | wrap(byte[] array, int offset, int length) | Wraps a byte array into a buffer. |
public static ByteBuffer allocateDirect(int capacity)
The new buffer's position will be zero, its limit will be its capacity, its mark will be undefined, and each of its elements will be initialized to zero. Whether or not it has abacking array is unspecified.
capacity - The new buffer's capacity, in bytesIllegalArgumentException - If thecapacity is a negative integerpublic static ByteBuffer allocate(int capacity)
The new buffer's position will be zero, its limit will be its capacity, its mark will be undefined, and each of its elements will be initialized to zero. It will have abacking array, and itsarray offset will be zero.
capacity - The new buffer's capacity, in bytesIllegalArgumentException - If thecapacity is a negative integerpublic static ByteBuffer wrap(byte[] array, int offset, int length)
The new buffer will be backed by the given byte array; that is, modifications to the buffer will cause the array to be modified and vice versa. The new buffer's capacity will bearray.length, its position will beoffset, its limit will beoffset + length, and its mark will be undefined. Itsbacking array will be the given array, and itsarray offset will be zero.
array - The array that will back the new bufferoffset - The offset of the subarray to be used; must be non-negative and no larger thanarray.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 thanarray.length - offset. The new buffer's limit will be set tooffset + length.IndexOutOfBoundsException - If the preconditions on theoffset andlength parameters do not holdpublic static ByteBuffer wrap(byte[] array)
The new buffer will be backed by the given byte 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 bearray.length, its position will be zero, and its mark will be undefined. Itsbacking array will be the given array, and itsarray offset> will be zero.
array - The array that will back this bufferpublic abstract ByteBuffer slice()
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 bytes remaining in this buffer, and its mark will be undefined. 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.
public abstract ByteBuffer duplicate()
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, and mark values 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.
public abstract ByteBuffer asReadOnlyBuffer()
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, and mark values 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 theduplicate method.
public abstract byte get()
BufferUnderflowException - If the buffer's current position is not smaller than its limitpublic abstract ByteBuffer put(byte b)
Writes the given byte into this buffer at the current position, and then increments the position.
b - The byte to be writtenBufferOverflowException - If this buffer's current position is not smaller than its limitReadOnlyBufferException - If this buffer is read-onlypublic abstract byte get(int index)
index - The index from which the byte will be readIndexOutOfBoundsException - Ifindex is negative or not smaller than the buffer's limitpublic abstract ByteBuffer put(int index, byte b)
Writes the given byte into this buffer at the given index.
index - The index at which the byte will be writtenb - The byte value to be writtenIndexOutOfBoundsException - Ifindex is negative or not smaller than the buffer's limitReadOnlyBufferException - If this buffer is read-onlypublic ByteBuffer get(byte[] dst, int offset, int length)
This method transfers bytes from this buffer into the given destination array. If there are fewer bytes remaining in the buffer than are required to satisfy the request, that is, iflength > remaining(), then no bytes are transferred and aBufferUnderflowException is thrown.
Otherwise, this method copieslength bytes 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 bylength.
In other words, an invocation of this method of the formsrc.get(dst, off, len) has exactly the same effect as the loop
for (int i = off; i < off + len; i++) dst[i] = src.get():dst - The array into which bytes are to be writtenoffset - The offset within the array of the first byte to be written; must be non-negative and no larger thandst.lengthlength - The maximum number of bytes to be written to the given array; must be non-negative and no larger thandst.length - offsetBufferUnderflowException - If there are fewer thanlength bytes remaining in this bufferIndexOutOfBoundsException - If the preconditions on theoffset andlength parameters do not holdpublic ByteBuffer get(byte[] dst)
This method transfers bytes from this buffer into the given destination array. An invocation of this method of the formsrc.get(a) behaves in exactly the same way as the invocation
src.get(a, 0, a.length)
dst - The destination arrayBufferUnderflowException - If there are fewer thanlength bytes remaining in this bufferpublic ByteBuffer put(ByteBuffer src)
This method transfers the bytes remaining in the given source buffer into this buffer. If there are more bytes remaining in the source buffer than in this buffer, that is, ifsrc.remaining() > remaining(), then no bytes are transferred and aBufferOverflowException is thrown.
Otherwise, this method copiesn = src.remaining() bytes from the given buffer into this buffer, starting at each buffer's current position. The positions of both buffers are then incremented byn.
In other words, an invocation of this method of the formdst.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.
src - The source buffer from which bytes are to be read; must not be this bufferBufferOverflowException - If there is insufficient space in this buffer for the remaining bytes in the source bufferIllegalArgumentException - If the source buffer is this bufferReadOnlyBufferException - If this buffer is read-onlypublic ByteBuffer put(byte[] src, int offset, int length)
This method transfers bytes into this buffer from the given source array. If there are more bytes to be copied from the array than remain in this buffer, that is, iflength > remaining(), then no bytes are transferred and aBufferOverflowException is thrown.
Otherwise, this method copieslength bytes 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 bylength.
In other words, an invocation of this method of the formdst.put(src, off, len) has exactly the same effect as the loop
for (int i = off; i < off + len; i++) dst.put(a[i]);src - The array from which bytes are to be readoffset - The offset within the array of the first byte to be read; must be non-negative and no larger thanarray.lengthlength - The number of bytes to be read from the given array; must be non-negative and no larger thanarray.length - offsetBufferOverflowException - If there is insufficient space in this bufferIndexOutOfBoundsException - If the preconditions on theoffset andlength parameters do not holdReadOnlyBufferException - If this buffer is read-onlypublic final ByteBuffer put(byte[] src)
This method transfers the entire content of the given source byte array into this buffer. An invocation of this method of the formdst.put(a) behaves in exactly the same way as the invocation
dst.put(a, 0, a.length)
src - The source arrayBufferOverflowException - If there is insufficient space in this bufferReadOnlyBufferException - If this buffer is read-onlypublic final boolean hasArray()
If this method returnstrue then thearray andarrayOffset methods may safely be invoked.
public final byte[] array()
Modifications to this buffer's content will cause the returned array's content to be modified, and vice versa.
Invoke thehasArray method before invoking this method in order to ensure that this buffer has an accessible backing array.
array in class BufferReadOnlyBufferException - If this buffer is backed by an array but is read-onlyUnsupportedOperationException - If this buffer is not backed by an accessible arraypublic final int arrayOffset()
If this buffer is backed by an array then buffer positionp corresponds to array indexp + arrayOffset().
Invoke thehasArray method before invoking this method in order to ensure that this buffer has an accessible backing array.
arrayOffset in class BufferReadOnlyBufferException - If this buffer is backed by an array but is read-onlyUnsupportedOperationException - If this buffer is not backed by an accessible arraypublic abstract ByteBuffer compact()
The bytes between the buffer's current position and its limit, if any, are copied to the beginning of the buffer. That is, the byte at indexp = position() is copied to index zero, the byte at indexp + 1 is copied to index one, and so forth until the byte at indexlimit() - 1 is copied to indexn = limit() - 1 - p. The buffer's position is then set ton+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 bytes copied, rather than to zero, so that an invocation of this method can be followed immediately by an invocation of another relativeput method.
Invoke this method after writing data from a buffer in case the write was incomplete. The following loop, for example, copies bytes from one channel to another via the bufferbuf:
buf.clear(); // Prepare buffer for use while (in.read(buf) >= 0 || buf.position != 0) { buf.flip(); out.write(buf); buf.compact(); // In case of partial write }
ReadOnlyBufferException - If this buffer is read-onlypublic abstract boolean isDirect()
public String toString()
public int hashCode()
The hash code of a byte buffer depends only upon its remaining elements; that is, upon the elements fromposition() up to, and including, the element atlimit() - 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.
hashCode in class ObjectObject.equals(java.lang.Object),System.identityHashCode(java.lang.Object)public boolean equals(Object ob)
Two byte buffers are equal if, and only if,
They have the same element type,
They have the same number of remaining elements, and
The two sequences of remaining elements, considered independently of their starting positions, are pointwise equal.
A byte buffer is not equal to any other type of object.
equals in class Objectob - The object to which this buffer is to be comparedObject.hashCode(),HashMappublic int compareTo(ByteBuffer that)
Two byte 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 ofbyte elements are compared as if by invokingByte.compare(byte,byte).
A byte buffer is not comparable to any other type of object.
compareTo in interface Comparable<ByteBuffer>that - the object to be compared.public final ByteOrder order()
The byte order is used when reading or writing multibyte values, and when creating buffers that are views of this byte buffer. The order of a newly-created byte buffer is alwaysBIG_ENDIAN.
public final ByteBuffer order(ByteOrder bo)
bo - The new byte order, eitherBIG_ENDIAN orLITTLE_ENDIANpublic abstract char getChar()
Reads the next two bytes at this buffer's current position, composing them into a char value according to the current byte order, and then increments the position by two.
BufferUnderflowException - If there are fewer than two bytes remaining in this bufferpublic abstract ByteBuffer putChar(char value)
Writes two bytes containing the given char value, in the current byte order, into this buffer at the current position, and then increments the position by two.
value - The char value to be writtenBufferOverflowException - If there are fewer than two bytes remaining in this bufferReadOnlyBufferException - If this buffer is read-onlypublic abstract char getChar(int index)
Reads two bytes at the given index, composing them into a char value according to the current byte order.
index - The index from which the bytes will be readIndexOutOfBoundsException - Ifindex is negative or not smaller than the buffer's limit, minus onepublic abstract ByteBuffer putChar(int index, char value)
Writes two bytes containing the given char value, in the current byte order, into this buffer at the given index.
index - The index at which the bytes will be writtenvalue - The char value to be writtenIndexOutOfBoundsException - Ifindex is negative or not smaller than the buffer's limit, minus oneReadOnlyBufferException - If this buffer is read-onlypublic abstract CharBuffer asCharBuffer()
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 bytes remaining in this buffer divided by two, and its mark will be undefined. 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.
public abstract short getShort()
Reads the next two bytes at this buffer's current position, composing them into a short value according to the current byte order, and then increments the position by two.
BufferUnderflowException - If there are fewer than two bytes remaining in this bufferpublic abstract ByteBuffer putShort(short value)
Writes two bytes containing the given short value, in the current byte order, into this buffer at the current position, and then increments the position by two.
value - The short value to be writtenBufferOverflowException - If there are fewer than two bytes remaining in this bufferReadOnlyBufferException - If this buffer is read-onlypublic abstract short getShort(int index)
Reads two bytes at the given index, composing them into a short value according to the current byte order.
index - The index from which the bytes will be readIndexOutOfBoundsException - Ifindex is negative or not smaller than the buffer's limit, minus onepublic abstract ByteBuffer putShort(int index, short value)
Writes two bytes containing the given short value, in the current byte order, into this buffer at the given index.
index - The index at which the bytes will be writtenvalue - The short value to be writtenIndexOutOfBoundsException - Ifindex is negative or not smaller than the buffer's limit, minus oneReadOnlyBufferException - If this buffer is read-onlypublic abstract ShortBuffer asShortBuffer()
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 bytes remaining in this buffer divided by two, and its mark will be undefined. 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.
public abstract int getInt()
Reads the next four bytes at this buffer's current position, composing them into an int value according to the current byte order, and then increments the position by four.
BufferUnderflowException - If there are fewer than four bytes remaining in this bufferpublic abstract ByteBuffer putInt(int value)
Writes four bytes containing the given int value, in the current byte order, into this buffer at the current position, and then increments the position by four.
value - The int value to be writtenBufferOverflowException - If there are fewer than four bytes remaining in this bufferReadOnlyBufferException - If this buffer is read-onlypublic abstract int getInt(int index)
Reads four bytes at the given index, composing them into a int value according to the current byte order.
index - The index from which the bytes will be readIndexOutOfBoundsException - Ifindex is negative or not smaller than the buffer's limit, minus threepublic abstract ByteBuffer putInt(int index, int value)
Writes four bytes containing the given int value, in the current byte order, into this buffer at the given index.
index - The index at which the bytes will be writtenvalue - The int value to be writtenIndexOutOfBoundsException - Ifindex is negative or not smaller than the buffer's limit, minus threeReadOnlyBufferException - If this buffer is read-onlypublic abstract IntBuffer asIntBuffer()
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 bytes remaining in this buffer divided by four, and its mark will be undefined. 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.
public abstract long getLong()
Reads the next eight bytes at this buffer's current position, composing them into a long value according to the current byte order, and then increments the position by eight.
BufferUnderflowException - If there are fewer than eight bytes remaining in this bufferpublic abstract ByteBuffer putLong(long value)
Writes eight bytes containing the given long value, in the current byte order, into this buffer at the current position, and then increments the position by eight.
value - The long value to be writtenBufferOverflowException - If there are fewer than eight bytes remaining in this bufferReadOnlyBufferException - If this buffer is read-onlypublic abstract long getLong(int index)
Reads eight bytes at the given index, composing them into a long value according to the current byte order.
index - The index from which the bytes will be readIndexOutOfBoundsException - Ifindex is negative or not smaller than the buffer's limit, minus sevenpublic abstract ByteBuffer putLong(int index, long value)
Writes eight bytes containing the given long value, in the current byte order, into this buffer at the given index.
index - The index at which the bytes will be writtenvalue - The long value to be writtenIndexOutOfBoundsException - Ifindex is negative or not smaller than the buffer's limit, minus sevenReadOnlyBufferException - If this buffer is read-onlypublic abstract LongBuffer asLongBuffer()
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 bytes remaining in this buffer divided by eight, and its mark will be undefined. 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.
public abstract float getFloat()
Reads the next four bytes at this buffer's current position, composing them into a float value according to the current byte order, and then increments the position by four.
BufferUnderflowException - If there are fewer than four bytes remaining in this bufferpublic abstract ByteBuffer putFloat(float value)
Writes four bytes containing the given float value, in the current byte order, into this buffer at the current position, and then increments the position by four.
value - The float value to be writtenBufferOverflowException - If there are fewer than four bytes remaining in this bufferReadOnlyBufferException - If this buffer is read-onlypublic abstract float getFloat(int index)
Reads four bytes at the given index, composing them into a float value according to the current byte order.
index - The index from which the bytes will be readIndexOutOfBoundsException - Ifindex is negative or not smaller than the buffer's limit, minus threepublic abstract ByteBuffer putFloat(int index, float value)
Writes four bytes containing the given float value, in the current byte order, into this buffer at the given index.
index - The index at which the bytes will be writtenvalue - The float value to be writtenIndexOutOfBoundsException - Ifindex is negative or not smaller than the buffer's limit, minus threeReadOnlyBufferException - If this buffer is read-onlypublic abstract FloatBuffer asFloatBuffer()
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 bytes remaining in this buffer divided by four, and its mark will be undefined. 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.
public abstract double getDouble()
Reads the next eight bytes at this buffer's current position, composing them into a double value according to the current byte order, and then increments the position by eight.
BufferUnderflowException - If there are fewer than eight bytes remaining in this bufferpublic abstract ByteBuffer putDouble(double value)
Writes eight bytes containing the given double value, in the current byte order, into this buffer at the current position, and then increments the position by eight.
value - The double value to be writtenBufferOverflowException - If there are fewer than eight bytes remaining in this bufferReadOnlyBufferException - If this buffer is read-onlypublic abstract double getDouble(int index)
Reads eight bytes at the given index, composing them into a double value according to the current byte order.
index - The index from which the bytes will be readIndexOutOfBoundsException - Ifindex is negative or not smaller than the buffer's limit, minus sevenpublic abstract ByteBuffer putDouble(int index, double value)
Writes eight bytes containing the given double value, in the current byte order, into this buffer at the given index.
index - The index at which the bytes will be writtenvalue - The double value to be writtenIndexOutOfBoundsException - Ifindex is negative or not smaller than the buffer's limit, minus sevenReadOnlyBufferException - If this buffer is read-onlypublic abstract DoubleBuffer asDoubleBuffer()
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 bytes remaining in this buffer divided by eight, and its mark will be undefined. 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.