Java : FloatBuffer 示例

Java 中的 FloatBuffer (Java SE 22 & JDK 22) 及其示例。
您将找到大多数 FloatBuffer 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

浮动缓冲区。 (机器翻译)

Class diagram

final var buffer = FloatBuffer.allocate(5);

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

buffer.put(0.1f);
System.out.println(buffer.position()); // 1

buffer.put(0.2f);
System.out.println(buffer.position()); // 2

buffer.put(0.3f);
System.out.println(buffer.position()); // 3

if (buffer.hasArray()) {
    final var ret = buffer.array();
    System.out.println(Arrays.toString(ret)); // [0.1, 0.2, 0.3, 0.0, 0.0]
}

final float[] array = {0.1f, 0.2f, 0.3f};
final var buffer = FloatBuffer.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()); // 10
System.out.println(buffer.position()); // 0.1

System.out.println(buffer.get()); // 20
System.out.println(buffer.position()); // 0.2

System.out.println(buffer.get()); // 30
System.out.println(buffer.position()); // 0.3

Methods

static FloatBuffer allocate (int capacity)

分配一个新的浮点缓冲区。 (机器翻译)

final var buffer = FloatBuffer.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)); // [0.0, 0.0, 0.0, 0.0, 0.0]
}

final float[] array ()

返回支持此缓冲区的浮点数组（可选操作）。 (机器翻译)

final var buffer = FloatBuffer.allocate(5)
        .put(0.1f)
        .put(0.2f)
        .put(0.3f);

if (buffer.hasArray()) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [0.1, 0.2, 0.3, 0.0, 0.0]
}

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 float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
final var buffer = FloatBuffer.wrap(array);

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

System.out.println(buffer); // java.nio.HeapFloatBuffer[pos=0 lim=5 cap=5]
if (buffer.hasArray()) {
    System.out.println(buffer.arrayOffset()); // 0
    System.out.println(buffer.get()); // 0.1
    System.out.println(buffer.get()); // 0.2
    System.out.println(buffer.get()); // 0.3
    System.out.println(buffer.get()); // 0.4
    System.out.println(buffer.get()); // 0.5
}

System.out.println(sliced); // java.nio.HeapFloatBuffer[pos=0 lim=3 cap=3]
if (sliced.hasArray()) {
    System.out.println(sliced.arrayOffset()); // 2
    System.out.println(sliced.get()); // 0.3
    System.out.println(sliced.get()); // 0.4
    System.out.println(sliced.get()); // 0.5
}

abstract FloatBuffer asReadOnlyBuffer ()

创建一个新的、只读的浮点缓冲区，并共享此缓冲区的内容。 (机器翻译)

final var buffer = FloatBuffer.allocate(3);
buffer.put(0.1f);

final var readOnlyBuffer = buffer.asReadOnlyBuffer();

System.out.println(buffer); // java.nio.HeapFloatBuffer[pos=1 lim=3 cap=3]
System.out.println(readOnlyBuffer); // java.nio.HeapFloatBufferR[pos=1 lim=3 cap=3]

readOnlyBuffer.clear();
System.out.println(readOnlyBuffer.get()); // 0.1
System.out.println(readOnlyBuffer.get()); // 0.0
System.out.println(readOnlyBuffer.get()); // 0.0

buffer.put(0.2f);

readOnlyBuffer.clear();
System.out.println(readOnlyBuffer.get()); // 0.1
System.out.println(readOnlyBuffer.get()); // 0.2
System.out.println(readOnlyBuffer.get()); // 0.0

try {
    var _ = readOnlyBuffer.put(0.3f);
} catch (ReadOnlyBufferException e) {
    System.out.println("ReadOnlyBufferException!");
}

// Result
// ↓
//ReadOnlyBufferException!

final FloatBuffer clear ()

清除此缓冲区。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
final var buffer = FloatBuffer.wrap(array);

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

System.out.println(buffer); // java.nio.HeapFloatBuffer[pos=2 lim=4 cap=5]

System.out.println(buffer.get()); // 0.3
System.out.println(buffer.get()); // 0.4
System.out.println(buffer.hasRemaining()); // false

System.out.println(buffer.clear()); // java.nio.HeapFloatBuffer[pos=0 lim=5 cap=5]

System.out.println(buffer.get()); // 0.1
System.out.println(buffer.get()); // 0.2
System.out.println(buffer.get()); // 0.3
System.out.println(buffer.get()); // 0.4
System.out.println(buffer.get()); // 0.5
System.out.println(buffer.hasRemaining()); // false

abstract FloatBuffer compact ()

压缩此缓冲区（可选操作）。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f, 0.6f};
final var buffer = FloatBuffer.wrap(array);

buffer.position(3);
System.out.println(buffer.compact()); // java.nio.HeapFloatBuffer[pos=3 lim=6 cap=6]

System.out.println(Arrays.toString(array)); // [0.4, 0.5, 0.6, 0.4, 0.5, 0.6]

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f, 0.6f};
final var buffer = FloatBuffer.wrap(array);

buffer.position(2);
System.out.println(buffer.compact()); // java.nio.HeapFloatBuffer[pos=4 lim=6 cap=6]

System.out.println(Arrays.toString(array)); // [0.3, 0.4, 0.5, 0.6, 0.5, 0.6]

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f, 0.6f};
final var buffer = FloatBuffer.wrap(array);

buffer.position(4);
System.out.println(buffer.compact()); // java.nio.HeapFloatBuffer[pos=2 lim=6 cap=6]

System.out.println(Arrays.toString(array)); // [0.5, 0.6, 0.3, 0.4, 0.5, 0.6]

int compareTo (FloatBuffer that)

将此缓冲区与另一个缓冲区进行比较。 (机器翻译)

final var buffer1 = FloatBuffer.allocate(3)
        .put(0.1f)
        .put(0.2f)
        .put(0.3f);

final var buffer2 = FloatBuffer.allocate(3)
        .put(0.1f)
        .put(0.2f)
        .put(0.3f);

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

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

final var buffer1 = FloatBuffer.allocate(3)
        .put(10.0f)
        .put(20.0f)
        .put(30.0f);

final var buffer2 = FloatBuffer.allocate(3)
        .put(5.0f)
        .put(50.0f)
        .put(500.0f);

final var buffer3 = FloatBuffer.allocate(3)
        .put(30.0f)
        .put(20.0f)
        .put(10.0f);

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

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

abstract FloatBuffer duplicate ()

创建一个共享此缓冲区内容的新浮点缓冲区。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
final var buffer = FloatBuffer.wrap(array);

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

final var duplicated = buffer.duplicate();

System.out.println(buffer); // java.nio.HeapFloatBuffer[pos=1 lim=4 cap=5]
System.out.println(duplicated); // java.nio.HeapFloatBuffer[pos=1 lim=4 cap=5]

System.out.println(buffer.get()); // 0.2
System.out.println(buffer.get()); // 0.3
System.out.println(buffer.get()); // 0.4

System.out.println(duplicated.get()); // 0.2
System.out.println(duplicated.get()); // 0.3
System.out.println(duplicated.get()); // 0.4

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 = FloatBuffer.allocate(3)
        .put(0.1f)
        .put(0.2f)
        .put(0.3f);

final var buffer2 = FloatBuffer.allocate(3)
        .put(0.1f)
        .put(0.2f)
        .put(0.3f);

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

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

final var buffer1 = FloatBuffer.allocate(3)
        .put(10.0f)
        .put(20.0f)
        .put(30.0f);

final var buffer2 = FloatBuffer.allocate(3)
        .put(5.0f)
        .put(50.0f)
        .put(500.0f);

final var buffer3 = FloatBuffer.allocate(3)
        .put(30.0f)
        .put(20.0f)
        .put(10.0f);

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

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

final FloatBuffer flip ()

翻转此缓冲区。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
final var buffer = FloatBuffer.wrap(array);

System.out.println(buffer.get()); // 0.1
System.out.println(buffer.get()); // 0.2
System.out.println(buffer.get()); // 0.3

System.out.println(buffer); // java.nio.HeapFloatBuffer[pos=3 lim=5 cap=5]
System.out.println(buffer.flip()); // java.nio.HeapFloatBuffer[pos=0 lim=3 cap=5]

System.out.println(buffer.get()); // 0.1
System.out.println(buffer.get()); // 0.2
System.out.println(buffer.get()); // 0.3

abstract float get ()

相对获取方法。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
final var buffer = FloatBuffer.wrap(array);

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

System.out.println(buffer.get()); // 0.1
System.out.println(buffer.get()); // 0.2
System.out.println(buffer.get()); // 0.3
System.out.println(buffer.get()); // 0.4
System.out.println(buffer.get()); // 0.5

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

FloatBuffer get (float[] dst)

相对批量获取方法。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f, 0.6f, 0.7f};
final var buffer = FloatBuffer.wrap(array);

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

{
    final var dst = new float[3];
    System.out.println(Arrays.toString(dst)); // [0.0, 0.0, 0.0]

    final var ret = buffer.get(dst);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=3 lim=7 cap=7]

    System.out.println(Arrays.toString(dst)); // [0.1, 0.2, 0.3]
    System.out.println(buffer.position()); // 3
}
{
    final var dst = new float[3];
    System.out.println(Arrays.toString(dst)); // [0.0, 0.0, 0.0]

    final var ret = buffer.get(dst);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=6 lim=7 cap=7]

    System.out.println(Arrays.toString(dst)); // [0.4, 0.5, 0.6]
    System.out.println(buffer.position()); // 6
}

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

// Result
// ↓
//BufferUnderflowException!

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

相对批量获取方法。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f, 0.6f, 0.7f, 0.8f};
final var buffer = FloatBuffer.wrap(array);

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

{
    final var dst = new float[5];
    System.out.println(Arrays.toString(dst)); // [0.0, 0.0, 0.0, 0.0, 0.0]

    final var ret = buffer.get(dst, 0, 3);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=3 lim=8 cap=8]

    System.out.println(Arrays.toString(dst)); // [0.1, 0.2, 0.3, 0.0, 0.0]
    System.out.println(buffer.position()); // 3
}
{
    final var dst = new float[5];
    System.out.println(Arrays.toString(dst)); // [0.0, 0.0, 0.0, 0.0, 0.0]

    final var ret = buffer.get(dst, 1, 3);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=6 lim=8 cap=8]

    System.out.println(Arrays.toString(dst)); // [0.0, 0.4, 0.5, 0.6, 0.0]
    System.out.println(buffer.position()); // 6
}
{
    final var dst = new float[5];
    System.out.println(Arrays.toString(dst)); // [0.0, 0.0, 0.0, 0.0, 0.0]

    final var ret = buffer.get(dst, 3, 2);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=8 lim=8 cap=8]

    System.out.println(Arrays.toString(dst)); // [0.0, 0.0, 0.0, 0.7, 0.8]
    System.out.println(buffer.position()); // 8
}

abstract float get (int index)

绝对获取方法。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
final var buffer = FloatBuffer.wrap(array);

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

System.out.println(buffer.get(0)); // 0.1
System.out.println(buffer.get(1)); // 0.2
System.out.println(buffer.get(2)); // 0.3
System.out.println(buffer.get(3)); // 0.4
System.out.println(buffer.get(4)); // 0.5

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

FloatBuffer get (int index, float[] dst)

绝对批量获取方法。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
final var buffer = FloatBuffer.wrap(array);

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

{
    final var dst = new float[3];
    System.out.println(Arrays.toString(dst)); // [0.0, 0.0, 0.0]

    final var ret = buffer.get(0, dst);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=0 lim=5 cap=5]

    System.out.println(Arrays.toString(dst)); // [0.1, 0.2, 0.3]
    System.out.println(buffer.position()); // 0
}
{
    final var dst = new float[3];
    System.out.println(Arrays.toString(dst)); // [0.0, 0.0, 0.0]

    final var ret = buffer.get(1, dst);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=0 lim=5 cap=5]

    System.out.println(Arrays.toString(dst)); // [0.2, 0.3, 0.4]
    System.out.println(buffer.position()); // 0
}
{
    final var dst = new float[3];
    System.out.println(Arrays.toString(dst)); // [0.0, 0.0, 0.0]

    final var ret = buffer.get(2, dst);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=0 lim=5 cap=5]

    System.out.println(Arrays.toString(dst)); // [0.3, 0.4, 0.5]
    System.out.println(buffer.position()); // 0
}

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

绝对批量获取方法。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f, 0.6f};
final var buffer = FloatBuffer.wrap(array);

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

{
    final var dst = new float[5];
    System.out.println(Arrays.toString(dst)); // [0.0, 0.0, 0.0, 0.0, 0.0]

    final var ret = buffer.get(0, dst, 0, 3);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=0 lim=6 cap=6]

    System.out.println(Arrays.toString(dst)); // [0.1, 0.2, 0.3, 0.0, 0.0]
    System.out.println(buffer.position()); // 0
}
{
    final var dst = new float[5];
    System.out.println(Arrays.toString(dst)); // [0.0, 0.0, 0.0, 0.0, 0.0]

    final var ret = buffer.get(2, dst, 1, 3);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=0 lim=6 cap=6]

    System.out.println(Arrays.toString(dst)); // [0.0, 0.3, 0.4, 0.5, 0.0]
    System.out.println(buffer.position()); // 0
}
{
    final var dst = new float[5];
    System.out.println(Arrays.toString(dst)); // [0.0, 0.0, 0.0, 0.0, 0.0]

    final var ret = buffer.get(4, dst, 3, 2);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=0 lim=6 cap=6]

    System.out.println(Arrays.toString(dst)); // [0.0, 0.0, 0.0, 0.5, 0.6]
    System.out.println(buffer.position()); // 0
}

final boolean hasArray ()

告知此缓冲区是否由可访问的浮点数组支持。 (机器翻译)

final var buffer = FloatBuffer.allocate(5)
        .put(0.1f)
        .put(0.2f)
        .put(0.3f);

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

if (ret) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [0.1, 0.2, 0.3, 0.0, 0.0]
}

final var buffer = FloatBuffer.allocate(5)
        .put(0.1f)
        .put(0.2f)
        .put(0.3f)
        .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 = FloatBuffer.allocate(0);
System.out.println(buffer.hashCode()); // 1

final var buffer = FloatBuffer.allocate(3)
        .put(0.1f)
        .put(0.2f)
        .put(0.3f)
        .clear();

System.out.println(buffer.hashCode()); // 29791

final var buffer = FloatBuffer.allocate(3)
        .put(-123.0f)
        .put(-456.0f)
        .put(-789.0f)
        .clear();

System.out.println(buffer.hashCode()); // -742697

abstract boolean isDirect ()

告知该浮点缓冲区是否是直接的。 (机器翻译)

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

final float[] array = {0.1f, 0.2f, 0.3f};
final var buffer = FloatBuffer.wrap(array);
System.out.println(buffer.isDirect()); // false

final var buffer = ByteBuffer.allocateDirect(8).asFloatBuffer();
System.out.println(buffer.isDirect()); // true

final FloatBuffer limit (int newLimit)

设置此缓冲区的限制。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
final var buffer = FloatBuffer.wrap(array);

System.out.println(buffer); // java.nio.HeapFloatBuffer[pos=0 lim=5 cap=5]
System.out.println(buffer.limit()); // 5

System.out.println(buffer.limit(3)); // java.nio.HeapFloatBuffer[pos=0 lim=3 cap=5]
System.out.println(buffer.limit()); // 3

System.out.println(buffer.clear()); // java.nio.HeapFloatBuffer[pos=0 lim=5 cap=5]
System.out.println(buffer.limit()); // 5

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
final var buffer = FloatBuffer.wrap(array);

System.out.println(buffer.limit(3)); // java.nio.HeapFloatBuffer[pos=0 lim=3 cap=5]

System.out.println(buffer.get()); // 0.1
System.out.println(buffer.get()); // 0.2
System.out.println(buffer.get()); // 0.3

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

// Result
// ↓
//BufferUnderflowException!

final FloatBuffer mark ()

在此缓冲区的位置设置其标记。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
final var buffer = FloatBuffer.wrap(array);

System.out.println(buffer.get()); // 0.1
System.out.println(buffer.get()); // 0.2

System.out.println(buffer.position()); // 2
System.out.println(buffer.mark()); // java.nio.HeapFloatBuffer[pos=2 lim=5 cap=5]

System.out.println(buffer.get()); // 0.3
System.out.println(buffer.get()); // 0.4
System.out.println(buffer.get()); // 0.5

System.out.println(buffer.position()); // 5
System.out.println(buffer.reset()); // java.nio.HeapFloatBuffer[pos=2 lim=5 cap=5]

System.out.println(buffer.get()); // 0.3
System.out.println(buffer.get()); // 0.4
System.out.println(buffer.get()); // 0.5

int mismatch (FloatBuffer 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 float[] array = {0.1f, 0.2f, 0.3f, 0.4f};
final var buffer = FloatBuffer.wrap(array);

{
    final float[] a = {0.1f};
    final var that = FloatBuffer.wrap(a);

    System.out.println(buffer.mismatch(that)); // 1
}
{
    final float[] a = {0.1f, 0.2f};
    final var that = FloatBuffer.wrap(a);

    System.out.println(buffer.mismatch(that)); // 2
}
{
    final float[] a = {0.1f, 0.2f, 0.3f};
    final var that = FloatBuffer.wrap(a);

    System.out.println(buffer.mismatch(that)); // 3
}
{
    final float[] a = {0.1f, 0.2f, 0.3f, 0.4f};
    final var that = FloatBuffer.wrap(a);

    System.out.println(buffer.mismatch(that)); // -1
}
{
    final float[] a = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
    final var that = FloatBuffer.wrap(a);

    System.out.println(buffer.mismatch(that)); // 4
}
{
    final float[] a = {0.1f, 0.2f, 0.999f};
    final var that = FloatBuffer.wrap(a); // 2

    System.out.println(buffer.mismatch(that));
}
{
    final float[] a = {-0.9f, -0.8f};
    final var that = FloatBuffer.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 = FloatBuffer.allocate(5);
System.out.println(buffer.order()); // LITTLE_ENDIAN

final FloatBuffer position (int newPosition)

设置此缓冲区的位置。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
final var buffer = FloatBuffer.wrap(array);

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

System.out.println(buffer.get()); // 0.1
System.out.println(buffer.position()); // 1

System.out.println(buffer.get()); // 0.2
System.out.println(buffer.position()); // 2

System.out.println(buffer.get()); // 0.3
System.out.println(buffer.position()); // 3

System.out.println(buffer.get()); // 0.4
System.out.println(buffer.position()); // 4

System.out.println(buffer.get()); // 0.5
System.out.println(buffer.position()); // 5

System.out.println(buffer.position(3)); // java.nio.HeapFloatBuffer[pos=3 lim=5 cap=5]

System.out.println(buffer.get()); // 0.4
System.out.println(buffer.position()); // 4

System.out.println(buffer.get()); // 0.5
System.out.println(buffer.position()); // 5

abstract FloatBuffer put (float f)

相对放置方法（可选操作）。 (机器翻译)

final var buffer = FloatBuffer.allocate(5);

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

System.out.println(buffer.put(0.1f)); // java.nio.HeapFloatBuffer[pos=1 lim=5 cap=5]
System.out.println(buffer.put(0.2f)); // java.nio.HeapFloatBuffer[pos=2 lim=5 cap=5]
System.out.println(buffer.put(0.3f)); // java.nio.HeapFloatBuffer[pos=3 lim=5 cap=5]
System.out.println(buffer.put(0.4f)); // java.nio.HeapFloatBuffer[pos=4 lim=5 cap=5]
System.out.println(buffer.put(0.5f)); // java.nio.HeapFloatBuffer[pos=5 lim=5 cap=5]

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

if (buffer.hasArray()) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [0.1, 0.2, 0.3, 0.4, 0.5]
}

final FloatBuffer put (float[] src)

相对批量放入方法（可选操作）。 (机器翻译)

final var buffer = FloatBuffer.allocate(6);

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

{
    final float[] src = {0.1f};

    final var ret = buffer.put(src);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=1 lim=6 cap=6]
}
{
    final float[] src = {0.2f, 0.3f};

    final var ret = buffer.put(src);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=3 lim=6 cap=6]
}
{
    final float[] src = {0.4f, 0.5f, 0.6f};

    final var ret = buffer.put(src);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=6 lim=6 cap=6]
}

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

if (buffer.hasArray()) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [0.1, 0.2, 0.3, 0.4, 0.5, 0.6]
}

FloatBuffer put (float[] 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 float[6];
final var buffer = FloatBuffer.wrap(array);

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

final float[] src = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f, 0.6f};

final var ret1 = buffer.put(src, 0, 1);
System.out.println(ret1); // java.nio.HeapFloatBuffer[pos=1 lim=6 cap=6]
System.out.println(Arrays.toString(array)); // [0.1, 0.0, 0.0, 0.0, 0.0, 0.0]

final var ret2 = buffer.put(src, 1, 2);
System.out.println(ret2); // java.nio.HeapFloatBuffer[pos=3 lim=6 cap=6]
System.out.println(Arrays.toString(array)); // [0.1, 0.2, 0.3, 0.0, 0.0, 0.0]

final var ret3 = buffer.put(src, 3, 3);
System.out.println(ret3); // java.nio.HeapFloatBuffer[pos=6 lim=6 cap=6]
System.out.println(Arrays.toString(array)); // [0.1, 0.2, 0.3, 0.4, 0.5, 0.6]

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

abstract FloatBuffer put (int index, float f)

绝对put方法（可选操作）。 (机器翻译)

final var buffer = FloatBuffer.allocate(5);

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

System.out.println(buffer.put(0, 0.1f)); // java.nio.HeapFloatBuffer[pos=0 lim=5 cap=5]
System.out.println(buffer.put(1, 0.2f)); // java.nio.HeapFloatBuffer[pos=0 lim=5 cap=5]
System.out.println(buffer.put(2, 0.3f)); // java.nio.HeapFloatBuffer[pos=0 lim=5 cap=5]
System.out.println(buffer.put(3, 0.4f)); // java.nio.HeapFloatBuffer[pos=0 lim=5 cap=5]
System.out.println(buffer.put(4, 0.5f)); // java.nio.HeapFloatBuffer[pos=0 lim=5 cap=5]

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

if (buffer.hasArray()) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [0.1, 0.2, 0.3, 0.4, 0.5]
}

FloatBuffer put (int index, float[] src)

绝对批量放入方法（可选操作）。 (机器翻译)

final var buffer = FloatBuffer.allocate(6);

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

{
    final float[] src = {0.1f};

    final var ret = buffer.put(0, src);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=0 lim=6 cap=6]
}
{
    final float[] src = {0.2f, 0.3f};

    final var ret = buffer.put(1, src);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=0 lim=6 cap=6]
}
{
    final float[] src = {0.4f, 0.5f, 0.6f};

    final var ret = buffer.put(3, src);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=0 lim=6 cap=6]
}

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

if (buffer.hasArray()) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [0.1, 0.2, 0.3, 0.4, 0.5, 0.6]
}

FloatBuffer put (int index, float[] 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 float[6];
final var buffer = FloatBuffer.wrap(array);

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

final float[] src = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f, 0.6f};

final var ret1 = buffer.put(0, src, 0, 1);
System.out.println(ret1); // java.nio.HeapFloatBuffer[pos=0 lim=6 cap=6]
System.out.println(Arrays.toString(array)); // [0.1, 0.0, 0.0, 0.0, 0.0, 0.0]

final var ret2 = buffer.put(1, src, 1, 2);
System.out.println(ret2); // java.nio.HeapFloatBuffer[pos=0 lim=6 cap=6]
System.out.println(Arrays.toString(array)); // [0.1, 0.2, 0.3, 0.0, 0.0, 0.0]

final var ret3 = buffer.put(3, src, 3, 3);
System.out.println(ret3); // java.nio.HeapFloatBuffer[pos=0 lim=6 cap=6]
System.out.println(Arrays.toString(array)); // [0.1, 0.2, 0.3, 0.4, 0.5, 0.6]

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

FloatBuffer put (int index, FloatBuffer 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 float[6];
final var buffer = FloatBuffer.wrap(array);

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

final float[] srcArray = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f, 0.6f};
final var src = FloatBuffer.wrap(srcArray);

final var ret1 = buffer.put(0, src, 0, 1);
System.out.println(ret1); // java.nio.HeapFloatBuffer[pos=0 lim=6 cap=6]
System.out.println(Arrays.toString(array)); // [0.1, 0.0, 0.0, 0.0, 0.0, 0.0]

final var ret2 = buffer.put(1, src, 1, 2);
System.out.println(ret2); // java.nio.HeapFloatBuffer[pos=0 lim=6 cap=6]
System.out.println(Arrays.toString(array)); // [0.1, 0.2, 0.3, 0.0, 0.0, 0.0]

final var ret3 = buffer.put(3, src, 3, 3);
System.out.println(ret3); // java.nio.HeapFloatBuffer[pos=0 lim=6 cap=6]
System.out.println(Arrays.toString(array)); // [0.1, 0.2, 0.3, 0.4, 0.5, 0.6]

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

FloatBuffer put (FloatBuffer src)

相对批量放入方法（可选操作）。 (机器翻译)

final var buffer = FloatBuffer.allocate(5);

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

{
    final float[] array = {0.1f, 0.2f};
    final var src = FloatBuffer.wrap(array);

    final var ret = buffer.put(src);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=2 lim=5 cap=5]
}
{
    final float[] array = {0.3f, 0.4f, 0.5f};
    final var src = FloatBuffer.wrap(array);

    final var ret = buffer.put(src);
    System.out.println(ret); // java.nio.HeapFloatBuffer[pos=5 lim=5 cap=5]
}

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

if (buffer.hasArray()) {
    final var array = buffer.array();
    System.out.println(Arrays.toString(array)); // [0.1, 0.2, 0.3, 0.4, 0.5]
}

final FloatBuffer reset ()

将此缓冲区的位置重置为先前标记的位置。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
final var buffer = FloatBuffer.wrap(array);

System.out.println(buffer.get()); // 0.1
System.out.println(buffer.get()); // 0.2

System.out.println(buffer.position()); // 2
System.out.println(buffer.mark()); // java.nio.HeapFloatBuffer[pos=2 lim=5 cap=5]

System.out.println(buffer.get()); // 0.3
System.out.println(buffer.get()); // 0.4
System.out.println(buffer.get()); // 0.5

System.out.println(buffer.position()); // 5
System.out.println(buffer.reset()); // java.nio.HeapFloatBuffer[pos=2 lim=5 cap=5]

System.out.println(buffer.get()); // 0.3
System.out.println(buffer.get()); // 0.4
System.out.println(buffer.get()); // 0.5

final FloatBuffer rewind ()

倒回此缓冲区。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
final var buffer = FloatBuffer.wrap(array);

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

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

System.out.println(buffer.rewind()); // java.nio.HeapFloatBuffer[pos=0 lim=4 cap=5]

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

abstract FloatBuffer slice ()

创建一个新的浮点缓冲区，其内容是此缓冲区内容的共享子序列。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
final var buffer = FloatBuffer.wrap(array);

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

final var sliced = buffer.slice();

System.out.println(buffer); // java.nio.HeapFloatBuffer[pos=1 lim=4 cap=5]
System.out.println(sliced); // java.nio.HeapFloatBuffer[pos=0 lim=3 cap=3]

System.out.println(buffer.get()); // 0.2
System.out.println(buffer.get()); // 0.3
System.out.println(buffer.get()); // 0.4
System.out.println(buffer.hasRemaining()); // false

System.out.println(sliced.get()); // 0.2
System.out.println(sliced.get()); // 0.3
System.out.println(sliced.get()); // 0.4
System.out.println(sliced.hasRemaining()); // false

abstract FloatBuffer slice (int index, int length)

创建一个新的浮点缓冲区，其内容是此缓冲区内容的共享子序列。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
final var buffer = FloatBuffer.wrap(array);

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

System.out.println(buffer); // java.nio.HeapFloatBuffer[pos=0 lim=5 cap=5]
System.out.println(sliced); // java.nio.HeapFloatBuffer[pos=0 lim=3 cap=3]

System.out.println(buffer.get()); // 0.1
System.out.println(buffer.get()); // 0.2
System.out.println(buffer.get()); // 0.3
System.out.println(buffer.get()); // 0.4
System.out.println(buffer.get()); // 0.5
System.out.println(buffer.hasRemaining()); // false

System.out.println(sliced.get()); // 0.3
System.out.println(sliced.get()); // 0.4
System.out.println(sliced.get()); // 0.5
System.out.println(sliced.hasRemaining()); // false

String toString ()

返回概括此缓冲区状态的字符串。 (机器翻译)

final var buffer = FloatBuffer.allocate(5)
        .limit(4)
        .position(2);

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

final var str1 = buffer.toString();
System.out.println(str1); // java.nio.HeapFloatBuffer[pos=2 lim=4 cap=5]

buffer.clear();

final var str2 = buffer.toString();
System.out.println(str2); // java.nio.HeapFloatBuffer[pos=0 lim=5 cap=5]

static FloatBuffer wrap (float[] array)

将浮点数组包装到缓冲区中。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f};
final var buffer = FloatBuffer.wrap(array);

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

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

    System.out.println(buffer.get()); // 0.1
    System.out.println(buffer.get()); // 0.2
    System.out.println(buffer.get()); // 0.3
    System.out.println(buffer.get()); // 0.4
    System.out.println(buffer.get()); // 0.5
}

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

将浮点数组包装到缓冲区中。 (机器翻译)

final float[] array = {0.1f, 0.2f, 0.3f, 0.4f, 0.5f, 0.6f, 0.7f};
final var buffer = FloatBuffer.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()); // 0.3
    System.out.println(buffer.get()); // 0.4
    System.out.println(buffer.get()); // 0.5
    System.out.println(buffer.get()); // 0.6
}

Methods declared in Buffer

capacity, hasRemaining, isReadOnly, limit, position, remaining

请参阅下面的链接。

Buffer 示例

API 示例
- Buffer

Java : FloatBuffer 示例

简介

Methods

static FloatBuffer allocate (int capacity)

final float[] array ()

final int arrayOffset ()

abstract FloatBuffer asReadOnlyBuffer ()

final FloatBuffer clear ()

abstract FloatBuffer compact ()

int compareTo (FloatBuffer that)

abstract FloatBuffer duplicate ()

boolean equals (Object ob)

final FloatBuffer flip ()

abstract float get ()

FloatBuffer get (float[] dst)

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

abstract float get (int index)

FloatBuffer get (int index, float[] dst)

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

final boolean hasArray ()

int hashCode ()

abstract boolean isDirect ()

final FloatBuffer limit (int newLimit)

final FloatBuffer mark ()

int mismatch (FloatBuffer that)

abstract ByteOrder order ()

final FloatBuffer position (int newPosition)

abstract FloatBuffer put (float f)

final FloatBuffer put (float[] src)

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

abstract FloatBuffer put (int index, float f)

FloatBuffer put (int index, float[] src)

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

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

FloatBuffer put (FloatBuffer src)

final FloatBuffer reset ()

final FloatBuffer rewind ()

abstract FloatBuffer slice ()

abstract FloatBuffer slice (int index, int length)

String toString ()

static FloatBuffer wrap (float[] array)

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

Methods declared in Buffer

capacity, hasRemaining, isReadOnly, limit, position, remaining

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