Java 中 ByteBuffer asLongBuffer()方法示例
原文:https://www . geeksforgeeks . org/bytebuffer-as long buffer-in-Java-method-with-examples/
java.nio.ByteBuffer 类的 asLongBuffer() 方法用于创建该字节缓冲区作为长缓冲区的视图。 新缓冲区的内容将从该缓冲区的当前位置开始。对此缓冲区内容的更改将在新缓冲区中可见,反之亦然;两个缓冲器的位置、极限和标记值将是独立的。 新缓冲区的位置将为零,其容量和限制将是该缓冲区中剩余的字节数除以 8,其标记将是未定义的。如果且仅当该缓冲区是直接的,则新缓冲区将是直接的;如果且仅当该缓冲区是只读的,则新缓冲区将是只读的。 语法:
public abstract LongBuffer asLongBuffer()
返回值:这个方法返回一个新的长缓冲区。 以下是举例说明 asLongBuffer() 方法: 例 1:
Java 语言(一种计算机语言,尤用于创建网站)
// Java program to demonstrate
// asLongBuffer() method
// for ByteBuffer
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 50;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// changing bytebuffer into
// LongBuffer
LongBuffer lb = bb.asLongBuffer();
// putting the value in LongBuffer
lb.put(1000000);
lb.put(2000000);
lb.put(3000000);
lb.put(3000000);
lb.rewind();
// Declaring variable c
long c;
// print the ByteBuffer
System.out.print("LongBuffer : ");
while ((c = lb.get()) != 0)
System.out.print(c + " ");
}
catch (IllegalArgumentException e) {
System.out.println("Exception thrown : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception thrown : " + e);
}
}
}
Output:
LongBuffer : 1000000 2000000 3000000 3000000
例 2:
Java 语言(一种计算机语言,尤用于创建网站)
// Java program to demonstrate
// asLongBuffer() method
// for ByteBuffer
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 50;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// changing bytebuffer into
// LongBuffer
LongBuffer lb = bb.asLongBuffer();
// putting the value in LongBuffer
lb.put(1000000);
lb.put(2000000);
lb.put(3000000);
lb.rewind();
// Declaring variable c
long c;
// print the ByteBuffer
System.out.print("LongBuffer : ");
while ((c = lb.get()) != 0)
System.out.print(c + " ");
// Creating a read-only copy of ByteBuffer
// using asReadOnlyBuffer() method
ByteBuffer bb1 = bb.asReadOnlyBuffer();
// changing read-only bytebuffer into
// read-only LongBuffer
LongBuffer lb1 = bb1.asLongBuffer();
// putting the value in read-only LongBuffer
System.out.println("\n\nTrying to put the value "
+ "in read only LongBuffer");
lb1.put(10);
lb1.put(20);
lb1.put(30);
lb1.rewind();
}
catch (IllegalArgumentException e) {
System.out.println("Exception thrown : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception thrown : " + e);
}
}
}
Output:
LongBuffer : 1000000 2000000 3000000
Trying to put the value in read only LongBuffer
Exception thrown : java.nio.ReadOnlyBufferException
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