/* * Copyright (C) 2014 The Android Open Source Project * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ // -- This file was mechanically generated: Do not edit! -- // package java.nio; import java.io.IOException; import java.util.Spliterator; import java.util.stream.StreamSupport; import java.util.stream.IntStream; /** * A char buffer. * *

This class defines four categories of operations upon * char buffers: * *

* *

Char buffers can be created either by {@link #allocate * allocation}, which allocates space for the buffer's * content, by {@link #wrap(char[]) wrapping} an existing * char array 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 {@link * #isDirect isDirect} method.

* *

This class implements the {@link CharSequence} interface so that * character buffers may be used wherever character sequences are accepted, for * example in the regular-expression package {@link java.util.regex}. *

* *

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);
* * @author Mark Reinhold * @author JSR-51 Expert Group * @since 1.4 */ public abstract class CharBuffer extends Buffer implements Comparable, Appendable, CharSequence, Readable { // These fields are declared here rather than in Heap-X-Buffer in order to // reduce the number of virtual method invocations needed to access these // values, which is especially costly when coding small buffers. // final char[] hb; // Non-null only for heap buffers final int offset; boolean isReadOnly; // Valid only for heap buffers // Creates a new buffer with the given mark, position, limit, capacity, // backing array, and array offset // CharBuffer(int mark, int pos, int lim, int cap, // package-private char[] hb, int offset) { super(mark, pos, lim, cap, 1); this.hb = hb; this.offset = offset; } // Creates a new buffer with the given mark, position, limit, and capacity // CharBuffer(int mark, int pos, int lim, int cap) { // package-private this(mark, pos, lim, cap, null, 0); } /** * Allocates a new char buffer. * *

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 a {@link #array * backing array}, and its {@link #arrayOffset array * offset} will be zero. * * @param capacity The new buffer's capacity, in chars * @return The new char buffer * @throws IllegalArgumentException If the capacity is a negative integer */ public static CharBuffer allocate(int capacity) { if (capacity < 0) throw new IllegalArgumentException(); return new HeapCharBuffer(capacity, capacity); } /** * Wraps a char array into a buffer. * *

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, and its mark will be undefined. Its * {@link #array backing array} will be the given array, and * its {@link #arrayOffset array offset} will be zero.

* * @param array The array that will back the new buffer * @param 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. * @param 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. * @return The new char buffer * @throws IndexOutOfBoundsException If the preconditions on the offset and * length * parameters do not hold */ public static CharBuffer wrap(char[] array, int offset, int length) { try { return new HeapCharBuffer(array, offset, length); } catch (IllegalArgumentException x) { throw new IndexOutOfBoundsException(); } } /** * Wraps a char array into a buffer. * *

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, and its mark will be * undefined. Its {@link #array backing array} will be the * given array, and its {@link #arrayOffset array offset} will * be zero.

* * @param array The array that will back this buffer * @return The new char buffer */ public static CharBuffer wrap(char[] array) { return wrap(array, 0, array.length); } /** * 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. * * @param target the buffer to read characters into * @return The number of characters added to the buffer, or * -1 if this source of characters is at its end * @throws IOException if an I/O error occurs * @throws NullPointerException if target is null * @throws ReadOnlyBufferException if target is a read only buffer * @since 1.5 */ public int read(CharBuffer target) throws IOException { // Determine the number of bytes n that can be transferred int targetRemaining = target.remaining(); int remaining = remaining(); if (remaining == 0) return -1; int n = Math.min(remaining, targetRemaining); int limit = limit(); // Set source limit to prevent target overflow if (targetRemaining < remaining) limit(position() + n); try { if (n > 0) target.put(this); } finally { limit(limit); // restore real limit } return n; } /** * Wraps a character sequence into a 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.

* * @param csq The character sequence from which the new character buffer is to * be created * @param 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. * @param 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. * @return The new character buffer * @throws IndexOutOfBoundsException If the preconditions on the start and * end * parameters do not hold */ public static CharBuffer wrap(CharSequence csq, int start, int end) { try { return new StringCharBuffer(csq, start, end); } catch (IllegalArgumentException x) { throw new IndexOutOfBoundsException(); } } /** * Wraps a character sequence into a buffer. * *

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.

* * @param csq The character sequence from which the new character buffer is to * be created * @return The new character buffer */ public static CharBuffer wrap(CharSequence csq) { return wrap(csq, 0, csq.length()); } /** * 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, 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.

* * @return The new char buffer */ public abstract CharBuffer slice(); /** * 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, 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.

* * @return The new char buffer */ public abstract CharBuffer duplicate(); /** * 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, 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 the {@link #duplicate duplicate} method.

* * @return The new, read-only char buffer */ public abstract CharBuffer asReadOnlyBuffer(); // -- Singleton get/put methods -- /** * Relative get method. Reads the char at this buffer's * current position, and then increments the position.

* * @return The char at the buffer's current position * @throws BufferUnderflowException If the buffer's current position is not smaller than its * limit */ public abstract char get(); /** * Relative put method  (optional operation). * *

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

* * @param c The char to be written * @return This buffer * @throws BufferOverflowException If this buffer's current position is not smaller than its * limit * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract CharBuffer put(char c); /** * Absolute get method. Reads the char at the given * index.

* * @param index The index from which the char will be read * @return The char at the given index * @throws IndexOutOfBoundsException If index is negative * or not smaller than the buffer's limit */ public abstract char get(int index); /** * Absolute get method. Reads the char at the given * index without any validation of the index. * * @param index * The index from which the char will be read * * @return The char at the given index */ abstract char getUnchecked(int index); // package-private /** * Absolute put method  (optional operation). * *

Writes the given char into this buffer at the given * index.

* * @param index The index at which the char will be written * @param c The char value to be written * @return This buffer * @throws IndexOutOfBoundsException If index is negative * or not smaller than the buffer's limit * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract CharBuffer put(int index, char c); // -- Bulk get operations -- /** * Relative bulk get method. * *

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 {@link 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.

* * @param dst The array into which chars are to be written * @param offset The offset within the array of the first char to be * written; must be non-negative and no larger than * dst.length * @param length The maximum number of chars to be written to the given * array; must be non-negative and no larger than * dst.length - offset * @return This buffer * @throws BufferUnderflowException If there are fewer than length chars * remaining in this buffer * @throws IndexOutOfBoundsException If the preconditions on the offset and * length * parameters do not hold */ public CharBuffer get(char[] dst, int offset, int length) { checkBounds(offset, length, dst.length); if (length > remaining()) throw new BufferUnderflowException(); int end = offset + length; for (int i = offset; i < end; i++) dst[i] = get(); return this; } /** * Relative bulk get method. * *

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)
* * @return This buffer * @throws BufferUnderflowException If there are fewer than length chars * remaining in this buffer */ public CharBuffer get(char[] dst) { return get(dst, 0, dst.length); } // -- Bulk put operations -- /** * Relative bulk put method  (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 {@link * 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.

* * @param src The source buffer from which chars are to be read; * must not be this buffer * @return This buffer * @throws BufferOverflowException If there is insufficient space in this buffer * for the remaining chars in the source buffer * @throws IllegalArgumentException If the source buffer is this buffer * @throws ReadOnlyBufferException If this buffer is read-only */ public CharBuffer put(CharBuffer src) { if (src == this) throw new IllegalArgumentException(); int n = src.remaining(); if (n > remaining()) throw new BufferOverflowException(); for (int i = 0; i < n; i++) put(src.get()); return this; } /** * Relative bulk put method  (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 {@link 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(a[i]);
* * except that it first checks that there is sufficient space in this * buffer and it is potentially much more efficient.

* * @param src The array from which chars are to be read * @param offset The offset within the array of the first char to be read; * must be non-negative and no larger than array.length * @param length The number of chars to be read from the given array; * must be non-negative and no larger than * array.length - offset * @return This buffer * @throws BufferOverflowException If there is insufficient space in this buffer * @throws IndexOutOfBoundsException If the preconditions on the offset and * length * parameters do not hold * @throws ReadOnlyBufferException If this buffer is read-only */ public CharBuffer put(char[] src, int offset, int length) { checkBounds(offset, length, src.length); if (length > remaining()) throw new BufferOverflowException(); int end = offset + length; for (int i = offset; i < end; i++) this.put(src[i]); return this; } /** * Relative bulk put method  (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)
* * @return This buffer * @throws BufferOverflowException If there is insufficient space in this buffer * @throws ReadOnlyBufferException If this buffer is read-only */ public final CharBuffer put(char[] src) { return put(src, 0, src.length); } /** * Relative bulk put method  (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 {@link * 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.

* * @param src The string from which chars are to be read * @param start The offset within the string of the first char to be read; * must be non-negative and no larger than * string.length() * @param 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() * @return This buffer * @throws BufferOverflowException If there is insufficient space in this buffer * @throws IndexOutOfBoundsException If the preconditions on the start and * end * parameters do not hold * @throws ReadOnlyBufferException If this buffer is read-only */ public CharBuffer put(String src, int start, int end) { checkBounds(start, end - start, src.length()); // Android changed : Don't bother making changes to the buffer if there's nothing // to write. This is questionable behaviour but code expects it. if (start == end) { return this; } // Android changed : Throw ReadOnlyBufferException as soon as possible. if (isReadOnly()) { throw new ReadOnlyBufferException(); } // Android changed : Throw as early as we can if there isn't enough space. if ((end - start) > remaining()) { throw new BufferOverflowException(); } for (int i = start; i < end; i++) this.put(src.charAt(i)); return this; } /** * Relative bulk put method  (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())
* * @return This buffer * @throws BufferOverflowException If there is insufficient space in this buffer * @throws ReadOnlyBufferException If this buffer is read-only */ public final CharBuffer put(String src) { return put(src, 0, src.length()); } // -- Other stuff -- /** * Tells whether or not this buffer is backed by an accessible char * array. * *

If this method returns true then the {@link #array() array} * and {@link #arrayOffset() arrayOffset} methods may safely be invoked. *

* * @return true if, and only if, this buffer * is backed by an array and is not read-only */ public final boolean hasArray() { return (hb != null) && !isReadOnly; } /** * 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 {@link #hasArray hasArray} method before invoking this * method in order to ensure that this buffer has an accessible backing * array.

* * @return The array that backs this buffer * @throws ReadOnlyBufferException If this buffer is backed by an array but is read-only * @throws UnsupportedOperationException If this buffer is not backed by an accessible array */ public final char[] array() { if (hb == null) throw new UnsupportedOperationException(); if (isReadOnly) throw new ReadOnlyBufferException(); return hb; } /** * 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 {@link #hasArray hasArray} method before invoking this * method in order to ensure that this buffer has an accessible backing * array.

* * @return 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 * @throws UnsupportedOperationException If this buffer is not backed by an accessible array */ public final int arrayOffset() { if (hb == null) throw new UnsupportedOperationException(); if (isReadOnly) throw new ReadOnlyBufferException(); return offset; } /** * 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.

* * @return This buffer * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract CharBuffer compact(); /** * Tells whether or not this char buffer is direct.

* * @return true if, and only if, this buffer is direct */ public abstract boolean isDirect(); /** * 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.

* * @return The current hash code of this buffer */ public int hashCode() { int h = 1; int p = position(); for (int i = limit() - 1; i >= p; i--) h = 31 * h + (int) get(i); return h; } /** * Tells whether or not this buffer is equal to another object. * *

Two char buffers are equal if, and only if, * *

    * *

  1. They have the same element type,

    2. * *

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

    3. * *

  3. The two sequences of remaining elements, considered * independently of their starting positions, are pointwise equal. * * * * * * * *

    4. * *
* *

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

* * @param ob The object to which this buffer is to be compared * @return true if, and only if, this buffer is equal to the * given object */ public boolean equals(Object ob) { if (this == ob) return true; if (!(ob instanceof CharBuffer)) return false; CharBuffer that = (CharBuffer) ob; if (this.remaining() != that.remaining()) return false; int p = this.position(); for (int i = this.limit() - 1, j = that.limit() - 1; i >= p; i--, j--) if (!equals(this.get(i), that.get(j))) return false; return true; } private static boolean equals(char x, char y) { return x == y; } /** * 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 {@code char} elements are compared as if by invoking * {@link Character#compare(char, char)}. * * *

A char buffer is not comparable to any other type of object. * * @return A negative integer, zero, or a positive integer as this buffer * is less than, equal to, or greater than the given buffer */ public int compareTo(CharBuffer that) { int n = this.position() + Math.min(this.remaining(), that.remaining()); for (int i = this.position(), j = that.position(); i < n; i++, j++) { int cmp = compare(this.get(i), that.get(j)); if (cmp != 0) return cmp; } return this.remaining() - that.remaining(); } private static int compare(char x, char y) { return Character.compare(x, y); } // -- Other char stuff -- /** * Returns a string containing the characters in 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.

* * @return The specified string */ public String toString() { return toString(position(), limit()); } abstract String toString(int start, int end); // package-private // --- Methods to support CharSequence --- /** * Returns the length of this character buffer. * *

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().

* * @return The length of this character buffer */ public final int length() { return remaining(); } /** * Reads the character at the given index relative to the current * position.

* * @param index The index of the character to be read, relative to the position; * must be non-negative and smaller than remaining() * @return The character at index * position() + index * @throws IndexOutOfBoundsException If the preconditions on index do not hold */ public final char charAt(int index) { return get(position() + checkIndex(index, 1)); } /** * Creates a new character buffer that represents the specified subsequence * of this buffer, relative to the current position. * *

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.

* * @param start The index, relative to the current position, of the first * character in the subsequence; must be non-negative and no larger * than remaining() * @param 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() * @return The new character buffer * @throws IndexOutOfBoundsException If the preconditions on start and end * do not hold */ public abstract CharBuffer subSequence(int start, int end); // --- Methods to support Appendable --- /** * 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 {@link CharBuffer#toString() * toString} method of a character buffer will return a subsequence whose * content depends upon the buffer's position and limit. * * @param csq The character sequence to append. If csq is * null, then the four characters "null" are * appended to this character buffer. * @return This buffer * @throws BufferOverflowException If there is insufficient space in this buffer * @throws ReadOnlyBufferException If this buffer is read-only * @since 1.5 */ public CharBuffer append(CharSequence csq) { if (csq == null) return put("null"); else return put(csq.toString()); } /** * 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())
* * @param 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". * @return This buffer * @throws BufferOverflowException If there is insufficient space in this buffer * @throws IndexOutOfBoundsException If start or end are negative, * start * is greater than end, or end is greater * than * csq.length() * @throws ReadOnlyBufferException If this buffer is read-only * @since 1.5 */ public CharBuffer append(CharSequence csq, int start, int end) { CharSequence cs = (csq == null ? "null" : csq); return put(cs.subSequence(start, end).toString()); } /** * 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)
* * @param c The 16-bit char to append * @return This buffer * @throws BufferOverflowException If there is insufficient space in this buffer * @throws ReadOnlyBufferException If this buffer is read-only * @since 1.5 */ public CharBuffer append(char c) { return put(c); } // -- Other byte stuff: Access to binary data -- /** * Retrieves this buffer's byte order. * *

The byte order of a char buffer created by allocation or by * wrapping an existing char array is the {@link * ByteOrder#nativeOrder 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.

* * @return This buffer's byte order */ public abstract ByteOrder order(); @Override public IntStream chars() { CharBuffer self = this; return StreamSupport.intStream(() -> new CharBufferSpliterator(self), Buffer.SPLITERATOR_CHARACTERISTICS, false); } }