putFloat(float value)
java.nio.ByteBuffer类的putFloat(float value)方法用于以当前字节顺序将包含给定float值的四个字节按当前字节顺序写入此缓冲区的当前位置，然后将该位置增加4。
用法:
public abstract ByteBuffer putFloat(float value)
参数：此方法采用参数float值，该参数是要写入的float值。
返回值：此方法返回此ByteBuffer，并带有作为参数传递的写入浮点值。
异常：此方法引发以下异常：
- BufferOverflowException-如果此缓冲区的当前位置不小于其限制
- ReadOnlyBufferException-如果此缓冲区是只读的
以下示例说明了putFloat(float value)方法：
范例1：
// Java program to demonstrate
// putFloat() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 12;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the value in ByteBuffer
// using putFloat() method
bb.putFloat(23.4f)
.putFloat(234.5f)
.putFloat(34.56f)
.rewind();
// print the ByteBuffer
System.out.print("Original ByteBuffer:[ ");
for (int i = 1; i <= capacity / 4; i++)
System.out.print(bb.getFloat() + " ");
System.out.print("]");
}
catch (BufferOverflowException e) {
System.out.println("Exception throws:" + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws:" + e);
}
}
}
输出：
Original ByteBuffer:[ 23.4 234.5 34.56 ]
范例2：演示BufferOverflowException。
// Java program to demonstrate
// putFloat() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 12;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the value in ByteBuffer
// using putFloat() method
bb.putFloat(23.4f)
.putFloat(234.5f)
.putFloat(34.56f)
.rewind();
// print the ByteBuffer
System.out.print("Original ByteBuffer:[ ");
for (int i = 1; i <= capacity / 4; i++)
System.out.print(bb.getFloat() + " ");
System.out.print("]");
// putting the value in ByteBuffer
// using putFloat() method
bb.putFloat(234.55f);
}
catch (BufferOverflowException e) {
System.out.println("\n\nbuffer's current "
+ "position is not smaller"
+ " than its limit");
System.out.println("Exception throws:" + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws:" + e);
}
}
}
输出：
Original ByteBuffer:[ 23.4 234.5 34.56 ] buffer's current position is not smaller than its limit Exception throws:java.nio.BufferOverflowException
范例3：演示ReadOnlyBufferException。
// Java program to demonstrate
// putFloat() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 12;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the value in ByteBuffer
// using putFloat() method
bb.putFloat(23.4f)
.putFloat(234.5f)
.putFloat(34.56f)
.rewind();
// print the ByteBuffer
System.out.print("Original ByteBuffer:[ ");
for (int i = 1; i <= capacity / 4; i++)
System.out.print(bb.getFloat() + " ");
System.out.print("]");
// Creating a read-only copy of ByteBuffer
// using asReadOnlyBuffer() method
ByteBuffer bb1 = bb.asReadOnlyBuffer();
System.out.println("\n\nTrying to put the float value"
+ " in read-only buffer");
// putting the value in readonly ByteBuffer
// using putFloat() method
bb1.putFloat(234.5f);
}
catch (BufferOverflowException e) {
System.out.println("Exception throws:" + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws:" + e);
}
}
}
输出：
Original ByteBuffer:[ 23.4 234.5 34.56 ] Trying to put the float value in read-only buffer Exception throws:java.nio.ReadOnlyBufferException
putFloat(int index, float value)
java.nio.ByteBuffer类的putFloat(int index，float value)方法用于按给定索引将包含给定四个值(按当前字节顺序)的四个字节写入当前缓冲区。
用法:
public abstract ByteBuffer putFloat(int index, float value)
参数：此方法将以下参数作为参数：
- index：将写入字节的索引
- value：要写入的双精度值
返回值：此方法返回此缓冲区。
异常：此方法引发以下异常：
- IndexOutOfBoundsException-如果索引为负或不小于缓冲区的限制
- ReadOnlyBufferException-如果此缓冲区是只读的
以下示例说明了putFloat(int index，float value)方法：
范例1：
// Java program to demonstrate
// putFloat() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 12;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the value in ByteBuffer
// using putFloat() at index 0
bb.putFloat(0, 23.45f);
// putting the value in ByteBuffer
// using putFloat() at index 4
bb.putFloat(4, 34.56f);
// putting the value in ByteBuffer
// using putFloat() at index 8
bb.putFloat(8, 27.56f);
// rewinding the ByteBuffer
bb.rewind();
// print the ByteBuffer
System.out.print("Original ByteBuffer:[ ");
for (int i = 1; i <= capacity / 4; i++)
System.out.print(bb.getFloat() + " ");
System.out.print("]\n");
}
catch (IndexOutOfBoundsException e) {
System.out.println("Exception throws:" + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws:" + e);
}
}
}
输出：
Original ByteBuffer:[ 23.45 34.56 27.56 ]
范例2：演示IndexOutOfBoundsException。
// Java program to demonstrate
// putFloat() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 12;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the value in ByteBuffer
// using putFloat() at index 0
bb.putFloat(0, 23.45f);
// putting the value in ByteBuffer
// using putFloat() at index 4
bb.putFloat(4, 34.56f);
// putting the value in ByteBuffer
// using putFloat() at index 8
bb.putFloat(8, 27.56f);
// rewinding the ByteBuffer
bb.rewind();
// print the ByteBuffer
System.out.print("Original ByteBuffer:[ ");
for (int i = 1; i <= capacity / 4; i++)
System.out.print(bb.getFloat() + " ");
System.out.print("]\n");
// putting the value in ByteBuffer
// using putFloat() at index -1
bb.putFloat(-1, 45.67f);
}
catch (IndexOutOfBoundsException e) {
System.out.println("\nindex is negative or not smaller "
+ "than the buffer's limit");
System.out.println("Exception throws:" + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws:" + e);
}
}
}
输出：
Original ByteBuffer:[ 23.45 34.56 27.56 ] index is negative or not smaller than the buffer's limit Exception throws:java.lang.IndexOutOfBoundsException
范例3：演示ReadOnlyBufferException。
// Java program to demonstrate
// putFloat() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 12;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// Creating a read-only copy of ByteBuffer
// using asReadOnlyBuffer() method
ByteBuffer bb1 = bb.asReadOnlyBuffer();
System.out.println("Trying to put the float value"
+ " in read only buffer");
// putting the value in readonly ByteBuffer
// using putFloat() method
bb1.putFloat(0, 23.4f);
}
catch (IndexOutOfBoundsException e) {
System.out.println("Exception throws:" + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws:" + e);
}
}
}
输出：
Trying to put the float value in read only buffer Exception throws:java.nio.ReadOnlyBufferException
参考：
- https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#putFloat-float-
- https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#getFloat-int-
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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 ByteBuffer putFloat() methods in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。