Java : CharBuffer 示例

Java 中的 CharBuffer (Java SE 22 & JDK 22) 及其示例。
您将找到大多数 CharBuffer 方法的代码示例。

注解 :

本文可能使用了翻译软件以方便阅读。另请查看英文原文。

简介

一个字符缓冲区。 (机器翻译)

Class diagram

final var buffer = CharBuffer.allocate(5);

System.out.println(buffer.capacity()); // 5
System.out.println(buffer.limit()); // 5
System.out.println(buffer.position()); // 0

buffer.put('a');
System.out.println(buffer.position()); // 1

buffer.put('b');
System.out.println(buffer.position()); // 2

buffer.put('c');
System.out.println(buffer.position()); // 3

if (buffer.hasArray()) {
    final var ret = buffer.array();
    System.out.println(Arrays.toString(ret)); // [a, b, c,  ,  ]
}

final char[] array = {'a', 'b', 'c'};
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.capacity()); // 3
System.out.println(buffer.limit()); // 3
System.out.println(buffer.position()); // 0

System.out.println(buffer.get()); // a
System.out.println(buffer.position()); // 1

System.out.println(buffer.get()); // b
System.out.println(buffer.position()); // 2

System.out.println(buffer.get()); // c
System.out.println(buffer.position()); // 3

Methods

static CharBuffer allocate (int capacity)

分配一个新的字符缓冲区。 (机器翻译)

final var buffer = CharBuffer.allocate(5);

System.out.println(buffer.capacity()); // 5
System.out.println(buffer.limit()); // 5
System.out.println(buffer.position()); // 0

if (buffer.hasArray()) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [ ,  ,  ,  ,  ]
}

CharBuffer append (char c)

将指定的字符附加到此缓冲区（可选操作）。 (机器翻译)

final var buffer = CharBuffer.allocate(3);

System.out.println(buffer.capacity()); // 3
System.out.println(buffer.position()); // 0

final var ret1 = buffer.append('a');
System.out.println(ret1.position()); // 1

final var ret2 = buffer.append('b');
System.out.println(ret2.position()); // 2

final var ret3 = buffer.append('c');
System.out.println(ret3.position()); // 3

if (buffer.hasArray()) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [a, b, c]
}

CharBuffer append (CharSequence csq)

将指定的字符序列附加到此缓冲区（可选操作）。 (机器翻译)

final var buffer = CharBuffer.allocate(6);

System.out.println(buffer.capacity()); // 6
System.out.println(buffer.position()); // 0

final var ret1 = buffer.append("a");
System.out.println(ret1.position()); // 1

final var ret2 = buffer.append("bc");
System.out.println(ret2.position()); // 3

final var ret3 = buffer.append("XYZ");
System.out.println(ret3.position()); // 6

if (buffer.hasArray()) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [a, b, c, X, Y, Z]
}

CharBuffer append (CharSequence csq, int start, int end)

将指定字符序列的子序列附加到此缓冲区（可选操作）。 (机器翻译)

final var array = new char[6];
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.capacity()); // 6
System.out.println(buffer.position()); // 0

final var csq = "abcXYZ";

final var ret1 = buffer.append(csq, 0, 1);
System.out.println(ret1.position()); // 1
System.out.println(Arrays.toString(array)); // [a,  ,  ,  ,  ,  ]

final var ret2 = buffer.append(csq, 1, 3);
System.out.println(ret2.position()); // 3
System.out.println(Arrays.toString(array)); // [a, b, c,  ,  ,  ]

final var ret3 = buffer.append(csq, 3, 6);
System.out.println(ret3.position()); // 6
System.out.println(Arrays.toString(array)); // [a, b, c, X, Y, Z]

final char[] array ()

返回支持此缓冲区的字符数组（可选操作）。 (机器翻译)

final var buffer = CharBuffer.allocate(5)
        .put('a')
        .put('b')
        .put('c');

if (buffer.hasArray()) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [a, b, c,  ,  ]
}

final int arrayOffset ()

返回此缓冲区的支持数组中缓冲区第一个元素的偏移量（可选操作）。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e'};
final var buffer = CharBuffer.wrap(array);

final var sliced = buffer.slice(2, 3);

System.out.println(buffer); // abcde
if (buffer.hasArray()) {
    System.out.println(buffer.arrayOffset()); // 0
    System.out.println(buffer.get()); // a
    System.out.println(buffer.get()); // b
    System.out.println(buffer.get()); // c
    System.out.println(buffer.get()); // d
    System.out.println(buffer.get()); // e
}

System.out.println(sliced); // cde
if (sliced.hasArray()) {
    System.out.println(sliced.arrayOffset()); // 2
    System.out.println(sliced.get()); // c
    System.out.println(sliced.get()); // d
    System.out.println(sliced.get()); // e
}

abstract CharBuffer asReadOnlyBuffer ()

创建一个新的、只读的字符缓冲区，并共享此缓冲区的内容。 (机器翻译)

final var buffer = CharBuffer.allocate(3);
buffer.put('a');

final var readOnlyBuffer = buffer.asReadOnlyBuffer();

System.out.println(buffer.position()); // 1
System.out.println(readOnlyBuffer.position()); // 1

readOnlyBuffer.clear();
System.out.println(readOnlyBuffer.get()); // a
System.out.println(readOnlyBuffer.get() == '\0'); // true
System.out.println(readOnlyBuffer.get() == '\0'); // true

buffer.put('b');

readOnlyBuffer.clear();
System.out.println(readOnlyBuffer.get()); // a
System.out.println(readOnlyBuffer.get()); // b
System.out.println(readOnlyBuffer.get() == '\0'); // true

try {
    var _ = readOnlyBuffer.put('c');
} catch (ReadOnlyBufferException e) {
    System.out.println("ReadOnlyBufferException!");
}

// Result
// ↓
//ReadOnlyBufferException!

final char charAt (int index)

读取相对于当前位置的给定索引处的字符。 (机器翻译)

final var buffer = CharBuffer.wrap("abcXYZ");

System.out.println(buffer.capacity()); // 6
System.out.println(buffer.position()); // 0

System.out.println(buffer.charAt(0)); // a
System.out.println(buffer.charAt(1)); // b
System.out.println(buffer.charAt(2)); // c
System.out.println(buffer.charAt(3)); // X
System.out.println(buffer.charAt(4)); // Y
System.out.println(buffer.charAt(5)); // Z

System.out.println(buffer.position()); // 0
buffer.position(3);

System.out.println(buffer.charAt(0)); // X
System.out.println(buffer.charAt(1)); // Y
System.out.println(buffer.charAt(2)); // Z

System.out.println(buffer.position()); // 3

final CharBuffer clear ()

清除此缓冲区。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e'};
final var buffer = CharBuffer.wrap(array);

buffer.limit(4);
buffer.position(2);

System.out.println(buffer.capacity()); // 5
System.out.println(buffer.limit()); // 4
System.out.println(buffer.position()); // 2

System.out.println(buffer.get()); // c
System.out.println(buffer.get()); // d
System.out.println(buffer.hasRemaining()); // false

final var ret = buffer.clear();
System.out.println(ret.capacity()); // 5
System.out.println(ret.limit()); // 5
System.out.println(ret.position()); // 0

System.out.println(buffer.get()); // a
System.out.println(buffer.get()); // b
System.out.println(buffer.get()); // c
System.out.println(buffer.get()); // d
System.out.println(buffer.get()); // e
System.out.println(buffer.hasRemaining()); // false

abstract CharBuffer compact ()

压缩此缓冲区（可选操作）。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'X', 'Y', 'Z'};
final var buffer = CharBuffer.wrap(array);

buffer.position(3);

final var ret = buffer.compact();
System.out.println(ret.position()); // 3

System.out.println(Arrays.toString(array)); // [X, Y, Z, X, Y, Z]

final char[] array = {'a', 'b', 'c', 'X', 'Y', 'Z'};
final var buffer = CharBuffer.wrap(array);

buffer.position(2);

final var ret = buffer.compact();
System.out.println(ret.position()); // 4

System.out.println(Arrays.toString(array)); // [c, X, Y, Z, Y, Z]

final char[] array = {'a', 'b', 'c', 'X', 'Y', 'Z'};
final var buffer = CharBuffer.wrap(array);

buffer.position(4);

final var ret = buffer.compact();
System.out.println(ret.position()); // 2

System.out.println(Arrays.toString(array)); // [Y, Z, c, X, Y, Z]

int compareTo (CharBuffer that)

将此缓冲区与另一个缓冲区进行比较。 (机器翻译)

final var buffer1 = CharBuffer.allocate(3)
        .put('a')
        .put('b')
        .put('c');

final var buffer2 = CharBuffer.allocate(3)
        .put('a')
        .put('b')
        .put('c');

buffer1.clear();
buffer2.clear();

System.out.println(buffer1.compareTo(buffer2)); // 0

final var buffer1 = CharBuffer.allocate(3)
        .put('b')
        .put('c')
        .put('d');

final var buffer2 = CharBuffer.allocate(3)
        .put('a')
        .put('x')
        .put('y');

final var buffer3 = CharBuffer.allocate(3)
        .put('d')
        .put('c')
        .put('b');

buffer1.clear();
buffer2.clear();
buffer3.clear();

System.out.println(buffer1.compareTo(buffer2)); // 1
System.out.println(buffer1.compareTo(buffer3)); // -2

abstract CharBuffer duplicate ()

创建一个共享此缓冲区内容的新字符缓冲区。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e'};
final var buffer = CharBuffer.wrap(array);

buffer.limit(4);
buffer.position(1);

final var duplicated = buffer.duplicate();

System.out.println(buffer.capacity()); // 5
System.out.println(buffer.limit()); // 4
System.out.println(buffer.position()); // 1

System.out.println(duplicated.capacity()); // 5
System.out.println(duplicated.limit()); // 4
System.out.println(duplicated.position()); // 1

System.out.println(buffer.get()); // b
System.out.println(buffer.get()); // c
System.out.println(buffer.get()); // d

System.out.println(duplicated.get()); // b
System.out.println(duplicated.get()); // c
System.out.println(duplicated.get()); // d

boolean equals (Object ob)

判断该缓冲区是否等于另一个对象。 (机器翻译)

final var buffer1 = CharBuffer.allocate(3)
        .put('a')
        .put('b')
        .put('c');

final var buffer2 = CharBuffer.allocate(3)
        .put('a')
        .put('b')
        .put('c');

buffer1.clear();
buffer2.clear();

System.out.println(buffer1.equals(buffer2)); // true

final var buffer1 = CharBuffer.allocate(3)
        .put('b')
        .put('c')
        .put('d');

final var buffer2 = CharBuffer.allocate(3)
        .put('a')
        .put('x')
        .put('y');

final var buffer3 = CharBuffer.allocate(3)
        .put('d')
        .put('c')
        .put('b');

buffer1.clear();
buffer2.clear();
buffer3.clear();

System.out.println(buffer1.equals(buffer2)); // false
System.out.println(buffer1.equals(buffer3)); // false

final CharBuffer flip ()

翻转此缓冲区。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e'};
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.capacity()); // 5
System.out.println(buffer.limit()); // 5
System.out.println(buffer.position()); // 0

System.out.println(buffer.get()); // a
System.out.println(buffer.get()); // b
System.out.println(buffer.get()); // c

System.out.println(buffer.limit()); // 5
System.out.println(buffer.position()); // 3

final var ret = buffer.flip();
System.out.println(ret.limit()); // 3
System.out.println(ret.position()); // 0

System.out.println(buffer.get()); // a
System.out.println(buffer.get()); // b
System.out.println(buffer.get()); // c

abstract char get ()

相对获取方法。 (机器翻译)

final char[] array = {'a', 'b', 'c'};
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.capacity()); // 3
System.out.println(buffer.position()); // 0

System.out.println(buffer.get()); // a
System.out.println(buffer.get()); // b
System.out.println(buffer.get()); // c

System.out.println(buffer.position()); // 3

CharBuffer get (char[] dst)

相对批量获取方法。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e', 'f', 'g'};
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.capacity()); // 7
System.out.println(buffer.position()); // 0

{
    final var dst = new char[3];
    System.out.println(Arrays.toString(dst)); // [ ,  ,  ]

    final var ret = buffer.get(dst);
    System.out.println(ret.position()); // 3

    System.out.println(Arrays.toString(dst)); // [a, b, c]
}
{
    final var dst = new char[3];
    System.out.println(Arrays.toString(dst)); // [ ,  ,  ]

    final var ret = buffer.get(dst);
    System.out.println(ret.position()); // 6

    System.out.println(Arrays.toString(dst)); // [d, e, f]
}

try {
    final var dst = new char[3];
    var _ = buffer.get(dst);
} catch (BufferUnderflowException e) {
    System.out.println("BufferUnderflowException!");
}

// Result
// ↓
//BufferUnderflowException!

CharBuffer get (char[] dst, int offset, int length)

相对批量获取方法。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'};
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.capacity()); // 8
System.out.println(buffer.position()); // 0

{
    final var dst = new char[5];
    System.out.println(Arrays.toString(dst)); // [ ,  ,  ,  ,  ]

    final var ret = buffer.get(dst, 0, 3);
    System.out.println(ret.position()); // 3

    System.out.println(Arrays.toString(dst)); // [a, b, c,  ,  ]
}
{
    final var dst = new char[5];
    System.out.println(Arrays.toString(dst)); // [ ,  ,  ,  ,  ]

    final var ret = buffer.get(dst, 1, 3);
    System.out.println(ret.position()); // 6

    System.out.println(Arrays.toString(dst)); // [ , d, e, f,  ]
}
{
    final var dst = new char[5];
    System.out.println(Arrays.toString(dst)); // [ ,  ,  ,  ,  ]

    final var ret = buffer.get(dst, 3, 2);
    System.out.println(ret.position()); // 8

    System.out.println(Arrays.toString(dst)); // [ ,  ,  , g, h]
}

abstract char get (int index)

绝对获取方法。 (机器翻译)

final char[] array = {'a', 'b', 'c'};
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.capacity()); // 3
System.out.println(buffer.position()); // 0

System.out.println(buffer.get(0)); // a
System.out.println(buffer.get(1)); // b
System.out.println(buffer.get(2)); // c

System.out.println(buffer.position()); // 0

CharBuffer get (int index, char[] dst)

绝对批量获取方法。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e'};
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.capacity()); // 5
System.out.println(buffer.position()); // 0

{
    final var dst = new char[3];
    System.out.println(Arrays.toString(dst)); // [ ,  ,  ]

    final var ret = buffer.get(0, dst);
    System.out.println(ret.position()); // 0

    System.out.println(Arrays.toString(dst)); // [a, b, c]
}
{
    final var dst = new char[3];
    System.out.println(Arrays.toString(dst)); // [ ,  ,  ]

    final var ret = buffer.get(1, dst);
    System.out.println(ret.position()); // 0

    System.out.println(Arrays.toString(dst)); // [b, c, d]
}
{
    final var dst = new char[3];
    System.out.println(Arrays.toString(dst)); // [ ,  ,  ]

    final var ret = buffer.get(2, dst);
    System.out.println(ret.position()); // 0

    System.out.println(Arrays.toString(dst)); // [c, d, e]
}

CharBuffer get (int index, char[] dst, int offset, int length)

绝对批量获取方法。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e', 'f'};
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.capacity()); // 6
System.out.println(buffer.position()); // 0

{
    final var dst = new char[5];
    System.out.println(Arrays.toString(dst)); // [ ,  ,  ,  ,  ]

    final var ret = buffer.get(0, dst, 0, 3);
    System.out.println(ret.position()); // 0

    System.out.println(Arrays.toString(dst)); // [a, b, c,  ,  ]
}
{
    final var dst = new char[5];
    System.out.println(Arrays.toString(dst)); // [ ,  ,  ,  ,  ]

    final var ret = buffer.get(2, dst, 1, 3);
    System.out.println(ret.position()); // 0

    System.out.println(Arrays.toString(dst)); // [ , c, d, e,  ]
}
{
    final var dst = new char[5];
    System.out.println(Arrays.toString(dst)); // [ ,  ,  ,  ,  ]

    final var ret = buffer.get(4, dst, 3, 2);
    System.out.println(ret.position()); // 0

    System.out.println(Arrays.toString(dst)); // [ ,  ,  , e, f]
}

final boolean hasArray ()

告知此缓冲区是否由可访问的字符数组支持。 (机器翻译)

final var buffer = CharBuffer.allocate(5)
        .put('a')
        .put('b')
        .put('c');

final var ret = buffer.hasArray();
System.out.println(ret); // true

if (ret) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [a, b, c,  ,  ]
}

final var buffer = CharBuffer.allocate(5)
        .put('a')
        .put('b')
        .put('c')
        .asReadOnlyBuffer();

System.out.println(buffer.hasArray()); // false
try {
    var _ = buffer.array();
} catch (UnsupportedOperationException e) {
    System.out.println("UnsupportedOperationException!");
}

// Result
// ↓
//UnsupportedOperationException!

int hashCode ()

返回此缓冲区的当前哈希码。 (机器翻译)

final var buffer = CharBuffer.allocate(0);
System.out.println(buffer.hashCode()); // 1

final var buffer = CharBuffer.allocate(3)
        .put('a')
        .put('b')
        .put('c')
        .clear();

System.out.println(buffer.hashCode()); // 128065

final var buffer = CharBuffer.allocate(3)
        .put('X')
        .put('Y')
        .put('Z')
        .clear();

System.out.println(buffer.hashCode()); // 119128

abstract boolean isDirect ()

告知该字符缓冲区是否是直接的。 (机器翻译)

final var buffer = CharBuffer.allocate(5);
System.out.println(buffer.isDirect()); // false

final char[] array = {'a', 'b', 'c'};
final var buffer = CharBuffer.wrap(array);
System.out.println(buffer.isDirect()); // false

final var buffer = ByteBuffer.allocateDirect(12).asCharBuffer();
System.out.println(buffer.isDirect()); // true

final boolean isEmpty ()

如果此字符缓冲区为空，则返回 true。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd'};
final var buffer = CharBuffer.wrap(array);

buffer.limit(3);

System.out.println(buffer.capacity()); // 4
System.out.println(buffer.limit()); // 3
System.out.println(buffer.position()); // 0

System.out.println(buffer.remaining()); // 3
System.out.println(buffer.length()); // 3
System.out.println(buffer.isEmpty()); // false

System.out.println(buffer.get()); // a
System.out.println(buffer.position()); // 1

System.out.println(buffer.remaining()); // 2
System.out.println(buffer.length()); // 2
System.out.println(buffer.isEmpty()); // false

System.out.println(buffer.get()); // b
System.out.println(buffer.position()); // 2

System.out.println(buffer.remaining()); // 1
System.out.println(buffer.length()); // 1
System.out.println(buffer.isEmpty()); // false

System.out.println(buffer.get()); // c
System.out.println(buffer.position()); // 3

System.out.println(buffer.remaining()); // 0
System.out.println(buffer.length()); // 0
System.out.println(buffer.isEmpty()); // true

final int length ()

返回此字符缓冲区的长度。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd'};
final var buffer = CharBuffer.wrap(array);

buffer.limit(3);

System.out.println(buffer.capacity()); // 4
System.out.println(buffer.limit()); // 3
System.out.println(buffer.position()); // 0

System.out.println(buffer.remaining()); // 3
System.out.println(buffer.length()); // 3
System.out.println(buffer.isEmpty()); // false

System.out.println(buffer.get()); // a
System.out.println(buffer.position()); // 1

System.out.println(buffer.remaining()); // 2
System.out.println(buffer.length()); // 2
System.out.println(buffer.isEmpty()); // false

System.out.println(buffer.get()); // b
System.out.println(buffer.position()); // 2

System.out.println(buffer.remaining()); // 1
System.out.println(buffer.length()); // 1
System.out.println(buffer.isEmpty()); // false

System.out.println(buffer.get()); // c
System.out.println(buffer.position()); // 3

System.out.println(buffer.remaining()); // 0
System.out.println(buffer.length()); // 0
System.out.println(buffer.isEmpty()); // true

final CharBuffer limit (int newLimit)

设置此缓冲区的限制。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e'};
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.position()); // 0
System.out.println(buffer.limit()); // 5

buffer.limit(3);

System.out.println(buffer.position()); // 0
System.out.println(buffer.limit()); // 3

buffer.clear();

System.out.println(buffer.position()); // 0
System.out.println(buffer.limit()); // 5

final char[] array = {'a', 'b', 'c', 'd', 'e'};
final var buffer = CharBuffer.wrap(array);

final var ret1 = buffer.limit(3);
System.out.println(ret1.limit()); // 3

System.out.println(buffer.get()); // a
System.out.println(buffer.get()); // b
System.out.println(buffer.get()); // c

try {
    var _ = buffer.get();
} catch (BufferUnderflowException e) {
    System.out.println("BufferUnderflowException!");
}

// Result
// ↓
//BufferUnderflowException!

final CharBuffer mark ()

在此缓冲区的位置设置其标记。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e'};
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.get()); // a
System.out.println(buffer.get()); // b

System.out.println(buffer.position()); // 2

final var ret1 = buffer.mark();
System.out.println(ret1.position()); // 2

System.out.println(buffer.get()); // c
System.out.println(buffer.get()); // d
System.out.println(buffer.get()); // e

System.out.println(buffer.position()); // 5

final var ret2 = buffer.reset();
System.out.println(ret2.position()); // 2

System.out.println(buffer.get()); // c
System.out.println(buffer.get()); // d
System.out.println(buffer.get()); // e

int mismatch (CharBuffer that)

查找并返回此缓冲区与给定缓冲区之间第一个不匹配的相对索引。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd'};
final var buffer = CharBuffer.wrap(array);

{
    final char[] a = {'a'};
    final var that = CharBuffer.wrap(a);

    System.out.println(buffer.mismatch(that)); // 1
}
{
    final char[] a = {'a', 'b'};
    final var that = CharBuffer.wrap(a);

    System.out.println(buffer.mismatch(that)); // 2
}
{
    final char[] a = {'a', 'b', 'c'};
    final var that = CharBuffer.wrap(a);

    System.out.println(buffer.mismatch(that)); // 3
}
{
    final char[] a = {'a', 'b', 'c', 'd'};
    final var that = CharBuffer.wrap(a);

    System.out.println(buffer.mismatch(that)); // -1
}
{
    final char[] a = {'a', 'b', 'c', 'd', 'e'};
    final var that = CharBuffer.wrap(a);

    System.out.println(buffer.mismatch(that)); // 4
}
{
    final char[] a = {'a', 'b', 'X'};
    final var that = CharBuffer.wrap(a); // 2

    System.out.println(buffer.mismatch(that));
}
{
    final char[] a = {'Y', 'Z'};
    final var that = CharBuffer.wrap(a);

    System.out.println(buffer.mismatch(that)); // 0
}

abstract ByteOrder order ()

检索此缓冲区的字节顺序。 (机器翻译)

final var os = System.getProperty("os.name");
System.out.println(os); // Windows 10

final var buffer = CharBuffer.allocate(5);
System.out.println(buffer.order()); // LITTLE_ENDIAN

final CharBuffer position (int newPosition)

设置此缓冲区的位置。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e'};
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.position()); // 0

System.out.println(buffer.get()); // a
System.out.println(buffer.position()); // 1

System.out.println(buffer.get()); // b
System.out.println(buffer.position()); // 2

System.out.println(buffer.get()); // c
System.out.println(buffer.position()); // 3

System.out.println(buffer.get()); // d
System.out.println(buffer.position()); // 4

System.out.println(buffer.get()); // e
System.out.println(buffer.position()); // 5

final var ret = buffer.position(3);
System.out.println(ret.position()); // 3

System.out.println(buffer.get()); // d
System.out.println(buffer.position()); // 4

System.out.println(buffer.get()); // e
System.out.println(buffer.position()); // 5

abstract CharBuffer put (char c)

相对放置方法（可选操作）。 (机器翻译)

final var buffer = CharBuffer.allocate(3);

System.out.println(buffer.capacity()); // 3
System.out.println(buffer.position()); // 0

final var ret1 = buffer.put('a');
System.out.println(ret1.position()); // 1

final var ret2 = buffer.put('b');
System.out.println(ret2.position()); // 2

final var ret3 = buffer.put('c');
System.out.println(ret3.position()); // 3

if (buffer.hasArray()) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [a, b, c]
}

final CharBuffer put (char[] src)

相对批量放入方法（可选操作）。 (机器翻译)

final var buffer = CharBuffer.allocate(6);

System.out.println(buffer.capacity()); // 6
System.out.println(buffer.position()); // 0

{
    final char[] src = {'a'};

    final var ret = buffer.put(src);
    System.out.println(ret.position()); // 1
}
{
    final char[] src = {'b', 'c'};

    final var ret = buffer.put(src);
    System.out.println(ret.position()); // 3
}
{
    final char[] src = {'d', 'e', 'f'};

    final var ret = buffer.put(src);
    System.out.println(ret.position()); // 6
}

if (buffer.hasArray()) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [a, b, c, d, e, f]
}

CharBuffer put (char[] src, int offset, int length)

相对批量放入方法（可选操作）。 (机器翻译)

final var array = new char[6];
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.capacity()); // 6
System.out.println(buffer.position()); // 0

final char[] src = {'a', 'b', 'c', 'd', 'e', 'f'};

final var ret1 = buffer.put(src, 0, 1);
System.out.println(ret1.position()); // 1
System.out.println(Arrays.toString(array)); // [a,  ,  ,  ,  ,  ]

final var ret2 = buffer.put(src, 1, 2);
System.out.println(ret2.position()); // 3
System.out.println(Arrays.toString(array)); // [a, b, c,  ,  ,  ]

final var ret3 = buffer.put(src, 3, 3);
System.out.println(ret3.position()); // 6
System.out.println(Arrays.toString(array)); // [a, b, c, d, e, f]

abstract CharBuffer put (int index, char c)

绝对put方法（可选操作）。 (机器翻译)

final var buffer = CharBuffer.allocate(3);

System.out.println(buffer.capacity()); // 3
System.out.println(buffer.position()); // 0

final var ret1 = buffer.put(0, 'a');
System.out.println(ret1.position()); // 0

final var ret2 = buffer.put(1, 'b');
System.out.println(ret2.position()); // 0

final var ret3 = buffer.put(2, 'c');
System.out.println(ret3.position()); // 0

if (buffer.hasArray()) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [a, b, c]
}

CharBuffer put (int index, char[] src)

绝对批量放入方法（可选操作）。 (机器翻译)

final var buffer = CharBuffer.allocate(6);

System.out.println(buffer.capacity()); // 6
System.out.println(buffer.position()); // 0

{
    final char[] src = {'a'};

    final var ret = buffer.put(0, src);
    System.out.println(ret.position()); // 0
}
{
    final char[] src = {'b', 'c'};

    final var ret = buffer.put(1, src);
    System.out.println(ret.position()); // 0
}
{
    final char[] src = {'d', 'e', 'f'};

    final var ret = buffer.put(3, src);
    System.out.println(ret.position()); // 0
}

if (buffer.hasArray()) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [a, b, c, d, e, f]
}

CharBuffer put (int index, char[] src, int offset, int length)

绝对批量放入方法（可选操作）。 (机器翻译)

final var array = new char[6];
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.capacity()); // 6
System.out.println(buffer.position()); // 0

final char[] src = {'a', 'b', 'c', 'd', 'e', 'f'};

final var ret1 = buffer.put(0, src, 0, 1);
System.out.println(ret1.position()); // 0
System.out.println(Arrays.toString(array)); // [a,  ,  ,  ,  ,  ]

final var ret2 = buffer.put(1, src, 1, 2);
System.out.println(ret2.position()); // 0
System.out.println(Arrays.toString(array)); // [a, b, c,  ,  ,  ]

final var ret3 = buffer.put(3, src, 3, 3);
System.out.println(ret3.position()); // 0
System.out.println(Arrays.toString(array)); // [a, b, c, d, e, f]

CharBuffer put (int index, CharBuffer src, int offset, int length)

绝对批量放入方法（可选操作）。 (机器翻译)

final var array = new char[6];
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.capacity()); // 6
System.out.println(buffer.position()); // 0

final char[] srcArray = {'a', 'b', 'c', 'd', 'e', 'f'};
final var src = CharBuffer.wrap(srcArray);

final var ret1 = buffer.put(0, src, 0, 1);
System.out.println(ret1.position()); // 0
System.out.println(Arrays.toString(array)); // [a,  ,  ,  ,  ,  ]

final var ret2 = buffer.put(1, src, 1, 2);
System.out.println(ret2.position()); // 0
System.out.println(Arrays.toString(array)); // [a, b, c,  ,  ,  ]

final var ret3 = buffer.put(3, src, 3, 3);
System.out.println(ret3.position()); // 0
System.out.println(Arrays.toString(array)); // [a, b, c, d, e, f]

final CharBuffer put (String src)

相对批量放入方法（可选操作）。 (机器翻译)

final var buffer = CharBuffer.allocate(6);

System.out.println(buffer.capacity()); // 6
System.out.println(buffer.position()); // 0

final var ret1 = buffer.put("a");
System.out.println(ret1.position()); // 1

final var ret2 = buffer.put("bc");
System.out.println(ret2.position()); // 3

final var ret3 = buffer.put("XYZ");
System.out.println(ret3.position()); // 6

if (buffer.hasArray()) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [a, b, c, X, Y, Z]
}

CharBuffer put (String src, int start, int end)

相对批量放入方法（可选操作）。 (机器翻译)

final var array = new char[6];
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.capacity()); // 6
System.out.println(buffer.position()); // 0

final var src = "abcXYZ";

final var ret1 = buffer.put(src, 0, 1);
System.out.println(ret1.position()); // 1
System.out.println(Arrays.toString(array)); // [a,  ,  ,  ,  ,  ]

final var ret2 = buffer.put(src, 1, 3);
System.out.println(ret2.position()); // 3
System.out.println(Arrays.toString(array)); // [a, b, c,  ,  ,  ]

final var ret3 = buffer.put(src, 3, 6);
System.out.println(ret3.position()); // 6
System.out.println(Arrays.toString(array)); // [a, b, c, X, Y, Z]

CharBuffer put (CharBuffer src)

相对批量放入方法（可选操作）。 (机器翻译)

final var buffer = CharBuffer.allocate(5);

System.out.println(buffer.capacity()); // 5
System.out.println(buffer.position()); // 0

{
    final char[] array = {'a', 'b'};
    final var src = CharBuffer.wrap(array);

    final var ret = buffer.put(src);
    System.out.println(ret.position()); // 2
}
{
    final char[] array = {'c', 'd', 'e'};
    final var src = CharBuffer.wrap(array);

    final var ret = buffer.put(src);
    System.out.println(ret.position()); // 5
}

if (buffer.hasArray()) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [a, b, c, d, e]
}

int read (CharBuffer target)

尝试将字符读入指定的字符缓冲区。 (机器翻译)

final var buffer = CharBuffer.wrap("abcde");

System.out.println(buffer.capacity()); // 5
System.out.println(buffer.position()); // 0

{
    final var array = new char[2];
    final var target = CharBuffer.wrap(array);

    System.out.println(buffer.read(target)); // 2
    System.out.println(buffer.position()); // 2
    System.out.println(Arrays.toString(array)); // [a, b]
}
{
    final var array = new char[3];
    final var target = CharBuffer.wrap(array);

    System.out.println(buffer.read(target)); // 3
    System.out.println(buffer.position()); // 5
    System.out.println(Arrays.toString(array)); // [c, d, e]
}

final CharBuffer reset ()

将此缓冲区的位置重置为先前标记的位置。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e'};
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.get()); // a
System.out.println(buffer.get()); // b

System.out.println(buffer.position()); // 2

final var ret1 = buffer.mark();
System.out.println(ret1.position()); // 2

System.out.println(buffer.get()); // c
System.out.println(buffer.get()); // d
System.out.println(buffer.get()); // e

System.out.println(buffer.position()); // 5

final var ret2 = buffer.reset();
System.out.println(ret2.position()); // 2

System.out.println(buffer.get()); // c
System.out.println(buffer.get()); // d
System.out.println(buffer.get()); // e

final CharBuffer rewind ()

倒回此缓冲区。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e'};
final var buffer = CharBuffer.wrap(array);

buffer.limit(4);
buffer.position(2);

System.out.println(buffer.limit()); // 4
System.out.println(buffer.position()); // 2

final var ret = buffer.rewind();
System.out.println(ret.limit()); // 4
System.out.println(ret.position()); // 0

abstract CharBuffer slice ()

创建一个新的字符缓冲区，其内容是此缓冲区内容的共享子序列。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e'};
final var buffer = CharBuffer.wrap(array);

buffer.limit(4);
buffer.position(1);

final var sliced = buffer.slice();

System.out.println(buffer.capacity()); // 5
System.out.println(buffer.limit()); // 4
System.out.println(buffer.position()); // 1

System.out.println(sliced.capacity()); // 3
System.out.println(sliced.limit()); // 3
System.out.println(sliced.position()); // 0

System.out.println(buffer.get()); // b
System.out.println(buffer.get()); // c
System.out.println(buffer.get()); // d
System.out.println(buffer.hasRemaining()); // false

System.out.println(sliced.get()); // b
System.out.println(sliced.get()); // c
System.out.println(sliced.get()); // d
System.out.println(sliced.hasRemaining()); // false

abstract CharBuffer slice (int index, int length)

创建一个新的字符缓冲区，其内容是此缓冲区内容的共享子序列。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e'};
final var buffer = CharBuffer.wrap(array);

final var sliced = buffer.slice(2, 3);

System.out.println(buffer.capacity()); // 5
System.out.println(buffer.limit()); // 5
System.out.println(buffer.position()); // 0

System.out.println(sliced.capacity()); // 3
System.out.println(sliced.limit()); // 3
System.out.println(sliced.position()); // 0

System.out.println(buffer.get()); // a
System.out.println(buffer.get()); // b
System.out.println(buffer.get()); // c
System.out.println(buffer.get()); // d
System.out.println(buffer.get()); // e
System.out.println(buffer.hasRemaining()); // false

System.out.println(sliced.get()); // c
System.out.println(sliced.get()); // d
System.out.println(sliced.get()); // e
System.out.println(sliced.hasRemaining()); // false

abstract CharBuffer subSequence (int start, int end)

创建一个新的字符缓冲区，表示此缓冲区相对于当前位置的指定子序列。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e'};
final var buffer = CharBuffer.wrap(array);

{
    final var ret = buffer.subSequence(0, 2);
    System.out.println(ret.capacity()); // 5
    System.out.println(ret.limit()); // 2
    System.out.println(ret.position()); // 0

    System.out.println(ret.get()); // a
    System.out.println(ret.get()); // b
    System.out.println(ret.hasRemaining()); // false
}

System.out.println(buffer.position()); // 0

{
    final var ret = buffer.subSequence(2, 5);
    System.out.println(ret.capacity()); // 5
    System.out.println(ret.limit()); // 5
    System.out.println(ret.position()); // 2

    System.out.println(ret.get()); // c
    System.out.println(ret.get()); // d
    System.out.println(ret.get()); // e
    System.out.println(ret.hasRemaining()); // false
}

System.out.println(buffer.position()); // 0

String toString ()

返回包含此缓冲区中的字符的字符串。 (机器翻译)

final var buffer = CharBuffer.wrap("abcXYZ");
System.out.println(buffer.position()); // 0

final var str1 = buffer.toString();
System.out.println(str1); // abcXYZ

buffer.position(3);
System.out.println(buffer.position()); // 3

final var str2 = buffer.toString();
System.out.println(str2); // XYZ

static CharBuffer wrap (char[] array)

将字符数组包装到缓冲区中。 (机器翻译)

final char[] array = {'a', 'b', 'c'};
final var buffer = CharBuffer.wrap(array);

System.out.println(buffer.capacity()); // 3
System.out.println(buffer.limit()); // 3
System.out.println(buffer.position()); // 0

if (buffer.hasArray()) {
    System.out.println(buffer.arrayOffset()); // 0

    System.out.println(buffer.get()); // a
    System.out.println(buffer.get()); // b
    System.out.println(buffer.get()); // c
}

static CharBuffer wrap (char[] array, int offset, int length)

将字符数组包装到缓冲区中。 (机器翻译)

final char[] array = {'a', 'b', 'c', 'd', 'e', 'f', 'g'};
final var buffer = CharBuffer.wrap(array, 2, 4);

System.out.println(buffer.capacity()); // 7
System.out.println(buffer.limit()); // 6
System.out.println(buffer.position()); // 2

if (buffer.hasArray()) {
    System.out.println(buffer.arrayOffset()); // 0

    System.out.println(buffer.get()); // c
    System.out.println(buffer.get()); // d
    System.out.println(buffer.get()); // e
    System.out.println(buffer.get()); // f
}

static CharBuffer wrap (CharSequence csq)

将字符序列包装到缓冲区中。 (机器翻译)

final var buffer = CharBuffer.wrap("abc");

System.out.println(buffer.capacity()); // 3
System.out.println(buffer.limit()); // 3
System.out.println(buffer.position()); // 0

System.out.println(buffer.get()); // a
System.out.println(buffer.get()); // b
System.out.println(buffer.get()); // c

static CharBuffer wrap (CharSequence csq, int start, int end)

将字符序列包装到缓冲区中。 (机器翻译)

final var buffer = CharBuffer.wrap("abcdefg", 2, 6);

System.out.println(buffer.capacity()); // 7
System.out.println(buffer.limit()); // 6
System.out.println(buffer.position()); // 2

System.out.println(buffer.get()); // c
System.out.println(buffer.get()); // d
System.out.println(buffer.get()); // e
System.out.println(buffer.get()); // f

Methods declared in Buffer

capacity, hasRemaining, isReadOnly, limit, position, remaining

请参阅下面的链接。

Buffer 示例

Methods declared in CharSequence

chars, codePoints

请参阅下面的链接。

CharSequence 示例

API 示例
- Buffer

Java : CharBuffer 示例

简介

Methods

static CharBuffer allocate (int capacity)

CharBuffer append (char c)

CharBuffer append (CharSequence csq)

CharBuffer append (CharSequence csq, int start, int end)

final char[] array ()

final int arrayOffset ()

abstract CharBuffer asReadOnlyBuffer ()

final char charAt (int index)

final CharBuffer clear ()

abstract CharBuffer compact ()

int compareTo (CharBuffer that)

abstract CharBuffer duplicate ()

boolean equals (Object ob)

final CharBuffer flip ()

abstract char get ()

CharBuffer get (char[] dst)

CharBuffer get (char[] dst, int offset, int length)

abstract char get (int index)

CharBuffer get (int index, char[] dst)

CharBuffer get (int index, char[] dst, int offset, int length)

final boolean hasArray ()

int hashCode ()

abstract boolean isDirect ()

final boolean isEmpty ()

final int length ()

final CharBuffer limit (int newLimit)

final CharBuffer mark ()

int mismatch (CharBuffer that)

abstract ByteOrder order ()

final CharBuffer position (int newPosition)

abstract CharBuffer put (char c)

final CharBuffer put (char[] src)

CharBuffer put (char[] src, int offset, int length)

abstract CharBuffer put (int index, char c)

CharBuffer put (int index, char[] src)

CharBuffer put (int index, char[] src, int offset, int length)

CharBuffer put (int index, CharBuffer src, int offset, int length)

final CharBuffer put (String src)

CharBuffer put (String src, int start, int end)

CharBuffer put (CharBuffer src)

int read (CharBuffer target)

final CharBuffer reset ()

final CharBuffer rewind ()

abstract CharBuffer slice ()

abstract CharBuffer slice (int index, int length)

abstract CharBuffer subSequence (int start, int end)

String toString ()

static CharBuffer wrap (char[] array)

static CharBuffer wrap (char[] array, int offset, int length)

static CharBuffer wrap (CharSequence csq)

static CharBuffer wrap (CharSequence csq, int start, int end)

Methods declared in Buffer

capacity, hasRemaining, isReadOnly, limit, position, remaining

Methods declared in CharSequence

chars, codePoints

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