putLong(int value)
java.nio.ByteBuffer类的putLong(int value)方法用于按当前字节顺序将包含给定long值的八个字节写入当前位置的此缓冲区中,然后将该位置增加8。
用法:
public abstract ByteBuffer putLong(long value)
参数:此方法将要写入的long值。
返回值:此方法返回此缓冲区。
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putLong(long value)方法:
范例1:
// Java program to demonstrate
// putLong() 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 putLong() method
bb.putLong(23)
.putLong(24)
.putLong(30)
.rewind();
// print the ByteBuffer
System.out.print("Original ByteBuffer:[ ");
for (int i = 1; i <= capacity / 8; i++)
System.out.print(bb.getLong() + " ");
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 24 30 ]
范例2:演示BufferOverflowException。
// Java program to demonstrate
// putLong() 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 putLong() method
bb.putLong(23)
.putLong(24)
.putLong(30)
.rewind();
// print the ByteBuffer
System.out.print("Original ByteBuffer:[ ");
for (int i = 1; i <= capacity / 8; i++)
System.out.print(bb.getLong() + " ");
System.out.print("]");
// putting the value in ByteBuffer
// using putInt() method
bb.putLong(234);
}
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 24 30 ] 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
// putLong() 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 putLong() method
bb.putLong(23)
.putLong(24)
.putLong(30)
.rewind();
// print the ByteBuffer
System.out.print("Original ByteBuffer:[ ");
for (int i = 1; i <= capacity / 8; i++)
System.out.print(bb.getLong() + " ");
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 long value"
+ " in read-only buffer");
// putting the value in readonly ByteBuffer
// using putLong() method
bb1.putLong(234);
}
catch (BufferOverflowException e) {
System.out.println("Exception throws:" + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws:" + e);
}
}
}
输出:
Original ByteBuffer:[ 23 24 30 ] Trying to put the long value in read only buffer Exception throws:java.nio.ReadOnlyBufferException
putLong(int index, long value)
java.nio.ByteBuffer类的putLong(int index,long value)方法用于以当前字节顺序将包含给定eight-byte值的八个字节按给定索引写入此缓冲区。
用法:
public abstract ByteBuffer putLong(int index, long 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int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putLong(int index,long value)方法:
范例1:
// Java program to demonstrate
// putLong() 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 putLong() at index 0
bb.putLong(0, 23);
// putting the value in ByteBuffer
// using putInt() at index 8
bb.putLong(8, 34);
// putting the value in ByteBuffer
// using putInt() at index 16
bb.putLong(16, 27);
// 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.getLong() + " ");
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 34 27 ]
范例2:演示IndexOutOfBoundsException。
// Java program to demonstrate
// putLong() 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 putLong() at index 0
bb.putLong(0, 23);
// putting the value in ByteBuffer
// using putInt() at index 8
bb.putLong(8, 34);
// putting the value in ByteBuffer
// using putInt() at index 16
bb.putLong(16, 27);
// 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.getLong() + " ");
System.out.print("]\n");
// putting the value in ByteBuffer
// using putInt() at index -1
bb.putInt(-1, 45);
}
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 34 27 ] 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
// putLong() 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);
// Creating a read-only copy of ByteBuffer
// using asReadOnlyBuffer() method
ByteBuffer bb1 = bb.asReadOnlyBuffer();
System.out.println("Trying to put the long value"
+ " in read-only buffer");
// putting the value in readonly ByteBuffer
// using putLong() method
bb1.putLong(0, 23);
}
catch (IndexOutOfBoundsException e) {
System.out.println("Exception throws:" + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws:" + e);
}
}
}
输出:
Trying to put the long value in read only buffer Exception throws:java.nio.ReadOnlyBufferException
参考:
- https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#putLong-long-
- https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#putLong-int-long-
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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 putLong() 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。