Java 中 ByteBuffer asShortBuffer()方法示例
原文:https://www . geeksforgeeks . org/bytebuffer-as short buffer-in-Java-method-with-examples/
java.nio.ByteBuffer 类的 asShortBuffer() 方法用于创建该字节缓冲区作为短缓冲区的视图。 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 2，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 ShortBuffer asShortBuffer()
返回值:这个方法返回一个新的短缓冲区。 以下是举例说明 asShortBuffer() 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
// asShortBuffer() 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
// ShortBuffer
ShortBuffer cb = bb.asShortBuffer();
// putting the value in ShortBuffer
cb.put((short)20);
cb.put((short)30);
cb.put((short)40);
cb.put((short)50);
cb.rewind();
// Declaring variable c
short c;
// print the ByteBuffer
System.out.print("ShortBuffer : ");
while ((c = cb.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:
ShortBuffer : 20 30 40 50
例 2:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to demonstrate
// asShortBuffer() 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
// ShortBuffer
IntBuffer cb = bb.asIntBuffer();
// putting the int to short typecast value in ShortBuffer
cb.put((short)10);
cb.put((short)20);
cb.put((short)30);
cb.rewind();
// Declaring variable c
int c;
// print the ByteBuffer
System.out.print("ShortBuffer : ");
while ((c = cb.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 ShortBuffer
ShortBuffer cb1 = bb1.asShortBuffer();
// putting the int to short typecast value in read-only ShortBuffer
System.out.println("\n\nTrying to put the value "
+ "in read only ShortBuffer");
cb1.put((short)10);
cb1.put((short)20);
cb1.put((short)30);
cb1.rewind();
}
catch (IllegalArgumentException e) {
System.out.println("Exception thrown : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception thrown : " + e);
}
}
}
Output:
ShortBuffer : 10 20 30
Trying to put the value in read only ShortBuffer
Exception thrown : java.nio.ReadOnlyBufferException
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