The asLongBuffer() method of java.nio.ByteBuffer class is used to create a view of this byte buffer as a long buffer.
The content of the new buffer will start at this buffer's current position. Changes to this buffer's content will be visible in the new buffer, and vice versa; the two buffers' position, limit, and mark values will be independent.
The new buffer's position will be zero, its capacity and its limit will be the number of bytes remaining in this buffer divided by eight, and its mark will be undefined. The new buffer will be direct if, and only if, this buffer is direct, and it will be read-only if, and only if, this buffer is read-only.
Syntax:
public abstract LongBuffer asLongBuffer()
Return Value: This method returns a new long buffer.
Below are the examples to illustrate the asLongBuffer() method:
Examples 1:
// 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
Examples 2:
// 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