putFloat(float value)
java.nio.ByteBuffer類的putFloat(float value)方法用於以當前字節順序將包含給定float值的四個字節按當前字節順序寫入此緩衝區的當前位置，然後將該位置增加4。
用法:
public abstract ByteBuffer putFloat(float value)
參數：此方法采用參數float值，該參數是要寫入的float值。
返回值：此方法返回此ByteBuffer，並帶有作為參數傳遞的寫入浮點值。
異常：此方法引發以下異常：
- BufferOverflowException-如果此緩衝區的當前位置不小於其限製
- ReadOnlyBufferException-如果此緩衝區是隻讀的
以下示例說明了putFloat(float value)方法：
範例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);
}
}
}
輸出：
Original ByteBuffer:[ 23.4 234.5 34.56 ]
範例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);
}
}
}
輸出：
Original ByteBuffer:[ 23.4 234.5 34.56 ] buffer's current position is not smaller than its limit Exception throws:java.nio.BufferOverflowException
範例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);
}
}
}
輸出：
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類的putFloat(int index，float value)方法用於按給定索引將包含給定四個值(按當前字節順序)的四個字節寫入當前緩衝區。
用法:
public abstract ByteBuffer putFloat(int index, float value)
參數：此方法將以下參數作為參數：
- index：將寫入字節的索引
- value：要寫入的雙精度值
返回值：此方法返回此緩衝區。
異常：此方法引發以下異常：
- IndexOutOfBoundsException-如果索引為負或不小於緩衝區的限製
- ReadOnlyBufferException-如果此緩衝區是隻讀的
以下示例說明了putFloat(int index，float value)方法：
範例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);
}
}
}
輸出：
Original ByteBuffer:[ 23.45 34.56 27.56 ]
範例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);
}
}
}
輸出：
Original ByteBuffer:[ 23.45 34.56 27.56 ] index is negative or not smaller than the buffer's limit Exception throws:java.lang.IndexOutOfBoundsException
範例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);
}
}
}
輸出：
Trying to put the float value in read only buffer Exception throws:java.nio.ReadOnlyBufferException
參考：
- 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：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 ByteBuffer putFloat() methods in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。