ByteBuffer asCharBuffer() method in Java with Examples

The asCharBuffer() method of java.nio.ByteBuffer class is used to create a view of this byte buffer as a char 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 two, 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 CharBuffer asCharBuffer()

Return Value: This method returns a new char buffer.



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

Example 1:

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// Java program to demonstrate
// asCharBuffer() 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 view as char buffer
            // and putting a string value
            bb.asCharBuffer().put("TajMahal");
  
            // Declaring char variable c
            char c;
  
            // print the ByteBuffer
            System.out.print("Char buffer : ");
            while ((c = bb.getChar()) != 0)
                System.out.print(c + " ");
            System.out.println();
        }
  
        catch (IllegalArgumentException e) {
  
            System.out.println("Exception thrown : " + e);
        }
  
        catch (ReadOnlyBufferException e) {
  
            System.out.println("Exception thrown : " + e);
        }
    }
}

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Output:

Char buffer : T a j M a h a l

Example 2:

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// Java program to demonstrate
// asCharBuffer() method
// for Read only 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
            // char buffer
            CharBuffer cb = bb.asCharBuffer();
  
            // putting the value in charbuffer
            cb.put("Tajmahal");
            cb.rewind();
  
            // Declaring variable c
            char c;
  
            // print the ByteBuffer
            System.out.print("Char buffer : ");
            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 char buffer
            CharBuffer cb1 = bb1.asCharBuffer();
  
            // putting the value in charbuffer
            System.out.println("\n\nTrying to put the string"
                               + " into read only charbuffer");
            cb1.put("Tajmahal");
        }
  
        catch (IllegalArgumentException e) {
  
            System.out.println("Exception thrown : " + e);
        }
  
        catch (ReadOnlyBufferException e) {
  
            System.out.println("Exception thrown : " + e);
        }
    }
}

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Output:

Char buffer : T a j m a h a l 

Trying to put the string into read only charbuffer
Exception thrown : java.nio.ReadOnlyBufferException


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