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ByteBuffer asDoubleBuffer() method in Java with Examples
  • Last Updated : 19 Sep, 2018

The asDoubleBuffer() method of java.nio.ByteBuffer class is used to create a view of this byte buffer as a double buffer.

The content of the new buffer will start from this buffer’s current position. Changes made 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 DoubleBuffer asDoubleBuffer()

Return Value: This method returns a new double buffer.



Below are the examples to illustrate the asDoubleBuffer() method:

Examples 1:




// Java program to demonstrate
// asDoubleBuffer() 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);
  
            // changeing  bytebuffer into
            // DoubleBuffer
            DoubleBuffer cb = bb.asDoubleBuffer();
  
            // putting the value in DoubleBuffer
            cb.put(5001.99);
            cb.put(5002.99);
            cb.put(5003.99);
            cb.rewind();
  
            // Declaring variable c
            double c;
  
            // print the ByteBuffer
            System.out.print("DoubleBuffer : ");
            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:
DoubleBuffer : 5001.99 5002.99 5003.99

Examples 2:




// Java program to demonstrate
// asDoubleBuffer() 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);
  
            // changeing  bytebuffer into
            // DoubleBuffer
            DoubleBuffer cb = bb.asDoubleBuffer();
  
            // putting the value in DoubleBuffer
            cb.put(5001.99);
            cb.put(5002.99);
            cb.put(5003.99);
            cb.rewind();
  
            // Declaring variable c
            double c;
  
            // print the ByteBuffer
            System.out.print("DoubleBuffer : ");
            while ((c = cb.get()) != 0)
                System.out.print(c + " ");
  
            // Creating a read-only copy of ByteBuffer
            // using asReadOnlyBuffer() method
            ByteBuffer bb1 = bb.asReadOnlyBuffer();
  
            // changeing read-only bytebuffer into
            // read-only DoubleBuffer
            DoubleBuffer cb1 = bb1.asDoubleBuffer();
  
            // putting the value in read-only double buffer
            System.out.println("\n\nTrying to put the value "
                               + "in read only double buffer");
            cb1.put(5001.99);
            cb1.put(5002.99);
            cb1.put(5003.99);
            cb1.rewind();
        }
  
        catch (IllegalArgumentException e) {
  
            System.out.println("Exception thrown : " + e);
        }
  
        catch (ReadOnlyBufferException e) {
  
            System.out.println("Exception thrown : " + e);
        }
    }
}
Output:
DoubleBuffer : 5001.99 5002.99 5003.99 

Trying to put the value in read only double buffer
Exception thrown : java.nio.ReadOnlyBufferException

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