Appendable, CharSequence, Comparable<CharBuffer>, Readable
A char buffer.
This class defines four categories of operations upon char buffers:
Absolute and relative get and put methods that read and write single chars;
Absolute and relative bulk get methods that transfer contiguous sequences of chars from this buffer into an array; and
Absolute and relative bulk put methods that transfer contiguous sequences of chars from a char array{#if[char]?, a string,} or some other char buffer into this buffer;{#if[!byte]? and}
A method for compacting a char buffer.
Char buffers can be created either by allocation, which allocates space for the buffer's content, by wrapping an existing char array {#if[char]?or string} into a buffer, or by creating a view of an existing byte buffer.
Like a byte buffer, a char buffer is either direct or non-direct. A char buffer created via the wrap methods of this class will be non-direct. A char 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 char buffer is direct may be determined by invoking the isDirect method.
This class implements the CharSequence interface so that character buffers may be used wherever character sequences are accepted, for example in the regular-expression package java.util.regex. The methods defined by CharSequence operate relative to the current position of the buffer when they are invoked.
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
cb.put("text/");
cb.put(subtype);
cb.put("; charset=");
cb.put(enc);
can, for example, be replaced by the single statement
cb.put("text/").put(subtype).put("; charset=").put(enc);
Allocates a new char buffer.
Appends the specified char to this buffer (optional operation).
Appends the specified character sequence to this buffer (optional operation).
Appends a subsequence of the specified character sequence to this buffer (optional operation).
char[]
Returns the char array that backs this buffer (optional operation).
int
Returns the offset within this buffer's backing array of the first element of the buffer (optional operation).
Creates a new, read-only char buffer that shares this buffer's content.
char
Reads the character at the given index relative to the current position.
Compacts this buffer (optional operation).
int
Compares this buffer to another.
Creates a new char buffer that shares this buffer's content.
boolean
Tells whether or not this buffer is equal to another object.
abstract char
Relative bulk get method.
get(char[] dst, int offset, int length)
Relative bulk get method.
abstract char
get(int index, char[] dst)
Absolute bulk get method.
get(int index, char[] dst, int offset, int length)
Absolute bulk get method.
boolean
Tells whether or not this buffer is backed by an accessible char array.
int
Returns the current hash code of this buffer.
abstract boolean
Tells whether or not this char buffer is direct.
boolean
Returns true if this character buffer is empty.
int
Returns the length of this character buffer.
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(char[] src, int offset, int length)
Relative bulk put method (optional operation).
Absolute put method (optional operation).
put(int index, char[] src)
Absolute bulk put method (optional operation).
put(int index, char[] src, int offset, int length)
Absolute bulk put method (optional operation).
Absolute bulk put method (optional operation).
Relative bulk put method (optional operation).
Relative bulk put method (optional operation).
Relative bulk put method (optional operation).
int
Attempts to read characters into the specified character buffer.
Resets this buffer's position to the previously-marked position.
Creates a new char buffer whose content is a shared subsequence of this buffer's content.
slice(int index, int length)
Creates a new char buffer whose content is a shared subsequence of this buffer's content.
Creates a new character buffer that represents the specified subsequence of this buffer, relative to the current position.
Returns a string containing the characters in this buffer.
Wraps a char array into a buffer.
wrap(char[] array, int offset, int length)
Wraps a char array into a buffer.
Wraps a character sequence into a buffer.
Wraps a character sequence into a buffer.
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.
capacity - The new buffer's capacity, in chars
IllegalArgumentException - If the capacity is a negative integer
The new buffer will be backed by the given char 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.
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.
IndexOutOfBoundsException - If the preconditions on the offset and length parameters do not hold
The new buffer will be backed by the given char 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.
array - The array that will back this buffer
Attempts to read characters into the specified character buffer. The buffer is used as a repository of characters as-is: the only changes made are the results of a put operation. No flipping or rewinding of the buffer is performed.
read in interface Readable
target - the buffer to read characters into
IOException - if an I/O error occurs
ReadOnlyBufferException - if target is a read only buffer
The content of the new, read-only buffer will be the content of the given character sequence. The buffer's capacity will be csq.length(), its position will be start, its limit will be end, and its mark will be undefined.
csq - The character sequence from which the new character buffer is to be created
start - The index of the first character to be used; must be non-negative and no larger than csq.length(). The new buffer's position will be set to this value.
end - The index of the character following the last character to be used; must be no smaller than start and no larger than csq.length(). The new buffer's limit will be set to this value.
IndexOutOfBoundsException - If the preconditions on the start and end parameters do not hold
The content of the new, read-only buffer will be the content of the given character sequence. The new buffer's capacity and limit will be csq.length(), its position will be zero, and its mark will be undefined.
csq - The character sequence from which the new character buffer is to be created
Creates a new char 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 chars 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.
Creates a new char 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.
slice in class Buffer
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
IndexOutOfBoundsException - If index is negative or greater than limit(), length is negative, or length > limit() - index
Creates a new char 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.
Creates a new, read-only char 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.
public abstract char get()
Relative get method. Reads the char at this buffer's current position, and then increments the position.
BufferUnderflowException - If the buffer's current position is not smaller than its limit
Relative
putmethod
(optional operation).
Writes the given char into this buffer at the current position, and then increments the position.
c - The char to be written
BufferOverflowException - If this buffer's current position is not smaller than its limit
ReadOnlyBufferException - If this buffer is read-only
public abstract char get(int index)
Absolute get method. Reads the char at the given index.
index - The index from which the char will be read
IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit
Absolute
putmethod
(optional operation).
Writes the given char into this buffer at the given index.
index - The index at which the char will be written
c - The char value to be written
IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit
ReadOnlyBufferException - If this buffer is read-only
Relative bulk
getmethod.
This method transfers chars from this buffer into the given destination array. If there are fewer chars remaining in the buffer than are required to satisfy the request, that is, if length > remaining(), then no chars are transferred and a BufferUnderflowException is thrown.
Otherwise, this method copies length chars 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 chars in this buffer and it is potentially much more efficient.
dst - The array into which chars are to be written
offset - The offset within the array of the first char to be written; must be non-negative and no larger than dst.length
length - The maximum number of chars to be written to the given array; must be non-negative and no larger than dst.length - offset
BufferUnderflowException - If there are fewer than length chars remaining in this buffer
IndexOutOfBoundsException - If the preconditions on the offset and length parameters do not hold
Relative bulk
getmethod.
This method transfers chars 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
src.get(a, 0, a.length)
dst - The destination array
BufferUnderflowException - If there are fewer than length chars remaining in this buffer
Absolute bulk
getmethod.
This method transfers length chars 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);
index - The index in this buffer from which the first char will be read; must be non-negative and less than limit()
dst - The destination array
offset - The offset within the array of the first char to be written; must be non-negative and less than dst.length
length - The number of chars to be written to the given array; must be non-negative and no larger than the smaller of limit() - index and dst.length - offset
IndexOutOfBoundsException - If the preconditions on the index, offset, and length parameters do not hold
Absolute bulk
getmethod.
This method transfers chars 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)
index - The index in this buffer from which the first char will be read; must be non-negative and less than limit()
dst - The destination array
IndexOutOfBoundsException - If index is negative, not smaller than limit(), or limit() - index < dst.length
Relative bulk
putmethod
(optional operation).
This method transfers the chars remaining in the given source buffer into this buffer. If there are more chars remaining in the source buffer than in this buffer, that is, if src.remaining() > remaining(), then no chars are transferred and a BufferOverflowException is thrown.
Otherwise, this method copies n = src.remaining() chars 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.
src - The source buffer from which chars are to be read; must not be this buffer
BufferOverflowException - If there is insufficient space in this buffer for the remaining chars in the source buffer
IllegalArgumentException - If the source buffer is this buffer
ReadOnlyBufferException - If this buffer is read-only
Absolute bulk
putmethod
(optional operation).
This method transfers length chars 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.
index - The index in this buffer at which the first char will be written; must be non-negative and less than limit()
src - The buffer from which chars are to be read
offset - The index within the source buffer of the first char to be read; must be non-negative and less than src.limit()
length - The number of chars to be read from the given buffer; must be non-negative and no larger than the smaller of limit() - index and src.limit() - offset
IndexOutOfBoundsException - If the preconditions on the index, offset, and length parameters do not hold
ReadOnlyBufferException - If this buffer is read-only
Relative bulk
putmethod
(optional operation).
This method transfers chars into this buffer from the given source array. If there are more chars to be copied from the array than remain in this buffer, that is, if length > remaining(), then no chars are transferred and a BufferOverflowException is thrown.
Otherwise, this method copies length chars 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.
src - The array from which chars are to be read
offset - The offset within the array of the first char to be read; must be non-negative and no larger than src.length
length - The number of chars to be read from the given array; must be non-negative and no larger than src.length - offset
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
Relative bulk
putmethod
(optional operation).
This method transfers the entire content of the given source char array into this buffer. An invocation of this method of the form dst.put(a) behaves in exactly the same way as the invocation
dst.put(a, 0, a.length)
src - The source array
BufferOverflowException - If there is insufficient space in this buffer
ReadOnlyBufferException - If this buffer is read-only
Absolute bulk
putmethod
(optional operation).
This method transfers length chars 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]);
index - The index in this buffer at which the first char will be written; must be non-negative and less than limit()
src - The array from which chars are to be read
offset - The offset within the array of the first char to be read; must be non-negative and less than src.length
length - The number of chars to be read from the given array; must be non-negative and no larger than the smaller of limit() - index and src.length - offset
IndexOutOfBoundsException - If the preconditions on the index, offset, and length parameters do not hold
ReadOnlyBufferException - If this buffer is read-only
Absolute bulk
putmethod
(optional operation).
This method copies chars 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);
index - The index in this buffer at which the first char will be written; must be non-negative and less than limit()
src - The array from which chars are to be read
IndexOutOfBoundsException - If index is negative, not smaller than limit(), or limit() - index < src.length
ReadOnlyBufferException - If this buffer is read-only
Relative bulk
putmethod
(optional operation).
This method transfers chars from the given string into this buffer. If there are more chars to be copied from the string than remain in this buffer, that is, if end - start > remaining(), then no chars are transferred and a BufferOverflowException is thrown.
Otherwise, this method copies n = end - start chars from the given string into this buffer, starting at the given start index and at the current position of this buffer. The position of this buffer is then incremented by n.
In other words, an invocation of this method of the form dst.put(src, start, end) has exactly the same effect as the loop
for (int i = start; i < end; i++)
dst.put(src.charAt(i));
except that it first checks that there is sufficient space in this buffer and it is potentially much more efficient.
src - The string from which chars are to be read
start - The offset within the string of the first char to be read; must be non-negative and no larger than string.length()
end - The offset within the string of the last char to be read, plus one; must be non-negative and no larger than string.length()
BufferOverflowException - If there is insufficient space in this buffer
IndexOutOfBoundsException - If the preconditions on the start and end parameters do not hold
ReadOnlyBufferException - If this buffer is read-only
Relative bulk
putmethod
(optional operation).
This method transfers the entire content of the given source string into this buffer. An invocation of this method of the form dst.put(s) behaves in exactly the same way as the invocation
dst.put(s, 0, s.length())
src - The source string
BufferOverflowException - If there is insufficient space in this buffer
ReadOnlyBufferException - If this buffer is read-only
public final boolean hasArray()
If this method returns true then the array and arrayOffset methods may safely be invoked.
public final char[] array()
Returns the char 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.
array in class Buffer
ReadOnlyBufferException - If this buffer is backed by an array but is read-only
UnsupportedOperationException - If this buffer is not backed by an accessible array
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.
arrayOffset in class Buffer
ReadOnlyBufferException - If this buffer is backed by an array but is read-only
UnsupportedOperationException - If this buffer is not backed by an accessible array
Sets this buffer's position. If the mark is defined and larger than the new position then it is discarded.
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.
Sets this buffer's mark at its position.
Invoking this method neither changes nor discards the mark's value.
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.
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.
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
Compacts this buffer
(optional operation).
The chars between the buffer's current position and its limit, if any, are copied to the beginning of the buffer. That is, the char at index p = position() is copied to index zero, the char at index p + 1 is copied to index one, and so forth until the char 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 chars copied, rather than to zero, so that an invocation of this method can be followed immediately by an invocation of another relative put method.
ReadOnlyBufferException - If this buffer is read-only
public abstract boolean isDirect()
Tells whether or not this char buffer is direct.
public int hashCode()
Returns the current hash code of this buffer.
The hash code of a char 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.
hashCode in class Object
Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
Tells whether or not this buffer is equal to another object.
Two char 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 char buffer is not equal to any other type of object.
equals in class Object
ob - The object to which this buffer is to be compared
true if, and only if, this buffer is equal to the given object
Object.hashCode(), HashMap
Compares this buffer to another.
Two char 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 char elements are compared as if by invoking Character.compare(char,char).
A char buffer is not comparable to any other type of object.
compareTo in interface Comparable<CharBuffer>
that - the object to be compared.
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.
that - The byte buffer to be tested for a mismatch with this buffer
The first character of the resulting string will be the character at this buffer's position, while the last character will be the character at index limit() - 1. Invoking this method does not change the buffer's position.
toString in interface CharSequence
toString in class Object
public final int length()
When viewed as a character sequence, the length of a character buffer is simply the number of characters between the position (inclusive) and the limit (exclusive); that is, it is equivalent to remaining().
length in interface CharSequence
public final boolean isEmpty()
Returns true if this character buffer is empty.
isEmpty in interface CharSequence
true if there are 0 remaining characters, otherwise false
public final char charAt(int index)
Reads the character at the given index relative to the current position.
charAt in interface CharSequence
index - The index of the character to be read, relative to the position; must be non-negative and smaller than remaining()
position() + index
IndexOutOfBoundsException - If the preconditions on index do not hold
The new buffer will share this buffer's content; that is, if the content of this buffer is mutable then modifications to one buffer will cause the other to be modified. The new buffer's capacity will be that of this buffer, its position will be position() + start, and its limit will be position() + end. 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.
subSequence in interface CharSequence
start - The index, relative to the current position, of the first character in the subsequence; must be non-negative and no larger than remaining()
end - The index, relative to the current position, of the character following the last character in the subsequence; must be no smaller than start and no larger than remaining()
IndexOutOfBoundsException - If the preconditions on start and end do not hold
Appends the specified character sequence to this buffer
(optional operation).
An invocation of this method of the form dst.append(csq) behaves in exactly the same way as the invocation
dst.put(csq.toString())
Depending on the specification of toString for the character sequence csq, the entire sequence may not be appended. For instance, invoking the toString method of a character buffer will return a subsequence whose content depends upon the buffer's position and limit.
append in interface Appendable
csq - The character sequence to append. If csq is null, then the four characters "null" are appended to this character buffer.
BufferOverflowException - If there is insufficient space in this buffer
ReadOnlyBufferException - If this buffer is read-only
Appends a subsequence of the specified character sequence to this buffer
(optional operation).
An invocation of this method of the form dst.append(csq, start, end) when csq is not null, behaves in exactly the same way as the invocation
dst.put(csq.subSequence(start, end).toString())
append in interface Appendable
csq - The character sequence from which a subsequence will be appended. If csq is null, then characters will be appended as if csq contained the four characters "null".
start - The index of the first character in the subsequence
end - The index of the character following the last character in the subsequence
BufferOverflowException - If there is insufficient space in this buffer
IndexOutOfBoundsException - If start or end are negative, start is greater than end, or end is greater than csq.length()
ReadOnlyBufferException - If this buffer is read-only
Appends the specified char to this buffer
(optional operation).
An invocation of this method of the form dst.append(c) behaves in exactly the same way as the invocation
dst.put(c)
append in interface Appendable
c - The 16-bit char to append
BufferOverflowException - If there is insufficient space in this buffer
ReadOnlyBufferException - If this buffer is read-only
The byte order of a char buffer created by allocation or by wrapping an existing char array is the native order of the underlying hardware. The byte order of a char buffer created as a view of a byte buffer is that of the byte buffer at the moment that the view is created.
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