FloatBuffer asReadOnlyBuffer() method in Java with Examples

The asReadOnlyBuffer() method of java.nio.FloatBuffer Class is used to create a new, read-only float buffer with this buffer’s content. The new buffer is a replica of this buffer. Hence changes made to this buffer’s content will be visible in the new buffer.

Since the new buffer is read-only, therefore any modification to its content won’t be allowed. The two buffers’ position, limit, and mark values will be independent. The new buffer’s capacity, limit, position, and mark values will be identical to those of this buffer. If this buffer is itself read-only then this method behaves in exactly the same way as the duplicate method.

Syntax :



public abstract FloatBuffer asReadOnlyBuffer()

Return Value: This method returns the new, read-only float buffer with the same content as that of this buffer.

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

Examples 1:

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// Java program to demonstrate
// asReadOnlyBuffer() method
  
import java.nio.*;
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // Declaring the capacity of the FloatBuffer
        int capacity = 10;
  
        // Creating the FloatBuffer
        try {
  
            // creating object of floatbuffer
            // and allocating size capacity
            FloatBuffer fb = FloatBuffer.allocate(capacity);
  
            // putting the value in floatbuffer
            fb.put(8.56F);
            fb.put(2, 9.61F);
            fb.rewind();
  
            // print the FloatBuffer
            System.out.println("Original FloatBuffer:  "
                               + Arrays.toString(fb.array()));
  
            // Creating a read-only copy of FloatBuffer
            // using asReadOnlyBuffer() method
            FloatBuffer floatBuffer = fb.asReadOnlyBuffer();
  
            // print the FloatBuffer
            System.out.print("\nReadOnlyBuffer FloatBuffer: ");
  
            while (floatBuffer.hasRemaining())
                System.out.print(floatBuffer.get() + ", ");
        }
  
        catch (IllegalArgumentException e) {
  
            System.out.println("IllegalArgumentException catched");
        }
  
        catch (ReadOnlyBufferException e) {
  
            System.out.println("ReadOnlyBufferException catched");
        }
    }
}

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Output:

Original FloatBuffer:  [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]

ReadOnlyBuffer FloatBuffer: 8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,

Examples 2:

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// Java program to demonstrate
// asReadOnlyBuffer() method
  
import java.nio.*;
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args) throws Exception
    {
  
        // Declaring the capacity of the fb
        int capacity1 = 10;
  
        // Declaring the capacity of the fb1
        int capacity2 = 5;
  
        // Creating the FloatBuffer
        try {
  
            //
            // fb
            //
            // creating object of floatbuffer fb
            // and allocating size capacity
            FloatBuffer fb = FloatBuffer.allocate(capacity1);
  
            // putting the value in fb
            fb.put(8.56F);
            fb.put(2, 9.61F);
            fb.rewind();
  
            // print the FloatBuffer
            System.out.println("FloatBuffer fb: "
                               + Arrays.toString(fb.array()));
  
            //
            // fb1
            //
            // creating object of floatbuffer fb1
            // and allocating size capacity
            FloatBuffer fb1 = FloatBuffer.allocate(capacity2);
  
            // putting the value in fb1
            fb1.put(1, 4.56F);
            fb1.put(2, 6.45F);
            fb1.rewind();
  
            // print the FloatBuffer
            System.out.println("\nFloatBuffer fb1:  "
                               + Arrays.toString(fb1.array()));
  
            // Creating a read-only copy of FloatBuffer
            // using asReadOnlyBuffer() method
            FloatBuffer readOnlyFb = fb.asReadOnlyBuffer();
  
            // print the FloatBuffer
            System.out.print("\nReadOnlyBuffer FloatBuffer: ");
  
            while (readOnlyFb.hasRemaining())
                System.out.print(readOnlyFb.get() + ", ");
  
            // try to change readOnlyFb
            System.out.println("\n\nTrying to get the array"
                               + " from ReadOnlyFb for editing");
  
            float[] fbarr = readOnlyFb.array();
        }
        catch (IllegalArgumentException e) {
            System.out.println("IllegalArgumentException catched");
        }
        catch (ReadOnlyBufferException e) {
            System.out.println("Exception thrown: " + e);
        }
    }
}

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Output:

FloatBuffer fb: [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]

FloatBuffer fb1:  [0.0, 4.56, 6.45, 0.0, 0.0]

ReadOnlyBuffer FloatBuffer: 8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 

Trying to get the array from ReadOnlyFb for editing
Exception thrown: java.nio.ReadOnlyBufferException


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