putDouble(double value)
java.nio.ByteBuffer類的putDouble(double value)方法用於按當前字節順序將包含給定double值的八個字節寫入當前位置的此緩衝區中，然後將位置增加8。
用法:
public abstract ByteBuffer putDouble?(double value)
參數：此方法將要寫入的雙精度值。
返回值：此方法返回此緩衝區。
異常：此方法引發以下異常：
- 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putDouble(double value)方法：
範例1：
// Java program to demonstrate
// putDouble() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 24;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the value in ByteBuffer
// using putDouble() method
bb.putDouble(23.4)
.putDouble(234.5)
.putDouble(34.56)
.rewind();
// print the ByteBuffer
System.out.print("Original ByteBuffer:[ ");
for (int i = 1; i <= capacity / 8; i++)
System.out.print(bb.getDouble() + " ");
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
// putDouble() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 24;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the value in ByteBuffer
// using putDouble() method
bb.putDouble(23.4)
.putDouble(234.5)
.putDouble(34.56)
.rewind();
// print the ByteBuffer
System.out.print("Original ByteBuffer:[ ");
for (int i = 1; i <= capacity / 8; i++)
System.out.print(bb.getDouble() + " ");
System.out.print("]");
// putting the value in ByteBuffer
// using putDouble() method
bb.putDouble(234.55);
}
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
// putDouble() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 24;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the value in ByteBuffer
// using putDouble() method
bb.putDouble(23.4)
.putDouble(234.5)
.putDouble(34.56)
.rewind();
// print the ByteBuffer
System.out.print("Original ByteBuffer:[ ");
for (int i = 1; i <= capacity / 8; i++)
System.out.print(bb.getDouble() + " ");
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 char value"
+ " in read-only buffer");
// putting the value in readonly ByteBuffer
// using putDouble() method
bb1.putDouble(234.5);
}
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 char value in read-only buffer Exception throws:java.nio.ReadOnlyBufferException
putDouble(int index, double value)
java.nio.ByteBuffer類的putDouble(int index，double value)方法用於以當前字節順序將包含給定double值的八個字節按給定索引寫入此緩衝區。
用法:
public abstract ByteBuffer putDouble(int index, double 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put(int index，double value)方法：
範例1：
// Java program to demonstrate
// putDouble() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 24;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the value in ByteBuffer
// using putDouble() at index 0
bb.putDouble(0, 23.45);
// putting the value in ByteBuffer
// using putDouble() at index 8
bb.putDouble(8, 34.56);
// putting the value in ByteBuffer
// using putDouble() at index 16
bb.putDouble(16, 27.56);
// rewinding the ByteBuffer
bb.rewind();
// print the ByteBuffer
System.out.print("Original ByteBuffer:[ ");
for (int i = 1; i <= capacity / 8; i++)
System.out.print(bb.getDouble() + " ");
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
// putDouble() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 24;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the value in ByteBuffer
// using putDouble() at index 0
bb.putDouble(0, 23.45);
// putting the value in ByteBuffer
// using putDouble() at index 8
bb.putDouble(8, 34.56);
// putting the value in ByteBuffer
// using putDouble() at index 16
bb.putDouble(16, 27.56);
// rewinding the ByteBuffer
bb.rewind();
// print the ByteBuffer
System.out.print("Original ByteBuffer:[ ");
for (int i = 1; i <= capacity / 8; i++)
System.out.print(bb.getDouble() + " ");
System.out.print("]\n");
// putting the value in ByteBuffer
// using putDouble() at index -1
bb.putDouble(-1, 45.67);
}
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
// putDouble() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 8;
// 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 byte value"
+ " in read-only buffer");
// putting the value in readonly ByteBuffer
// using putDouble() method
bb1.putDouble(0, 'a');
}
catch (IndexOutOfBoundsException e) {
System.out.println("Exception throws:" + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws:" + e);
}
}
}
輸出：
Trying to put the byte value in read-only buffer Exception throws:java.nio.ReadOnlyBufferException
參考：
- https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#putDouble-double-
- https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#putDouble-int-double-
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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 putDouble() 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。