IntBuffer asReadOnlyBuffer() method in Java

The asReadOnlyBuffer() method of java.nio.IntBuffer Class is used to create a new, read-only int 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 IntBuffer asReadOnlyBuffer()

Return Value: This method returns the new, read-only int 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 IntBuffer
        int capacity = 10;
  
        // Creating the IntBuffer
        try {
  
            // creating object of Intbuffer
            // and allocating size capacity
            IntBuffer ib = IntBuffer.allocate(capacity);
  
            // putting the value in Intbuffer
            ib.put(8);
            ib.put(2, 9);
            ib.rewind();
  
            // print the IntBuffer
            System.out.println("Original IntBuffer:  "
                               + Arrays.toString(ib.array()));
  
            // Creating a read-only copy of IntBuffer
            // using asReadOnlyBuffer() method
            IntBuffer IntBuffer = ib.asReadOnlyBuffer();
  
            // print the IntBuffer
            System.out.print("\nReadOnlyBuffer IntBuffer: ");
  
            while (IntBuffer.hasRemaining())
                System.out.print(IntBuffer.get() + ", ");
        }
  
        catch (IllegalArgumentException e) {
            System.out.println("IllegalArgumentException catched");
        }
  
        catch (ReadOnlyBufferException e) {
            System.out.println("ReadOnlyBufferException catched");
        }
    }
}

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Output:

Original IntBuffer:  [8, 0, 9, 0, 0, 0, 0, 0, 0, 0]

ReadOnlyBuffer IntBuffer: 8, 0, 9, 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 ib
        int capacity1 = 10;
  
        // Declaring the capacity of the ib1
        int capacity2 = 5;
  
        // Creating the IntBuffer
        try {
   
            // creating object of Intbuffer ib
            // and allocating size capacity
            IntBuffer ib = IntBuffer.allocate(capacity1);
  
            // putting the value in ib
            ib.put(8);
            ib.put(2, 9);
            ib.rewind();
  
            // print the IntBuffer
            System.out.println("IntBuffer ib: "
                               + Arrays.toString(ib.array()));
  
            // ib1
            // creating object of Intbuffer ib1
            // and allocating size capacity
            IntBuffer ib1 = IntBuffer.allocate(capacity2);
  
            // putting the value in ib1
            ib1.put(1, 4);
            ib1.put(2, 6);
            ib1.rewind();
  
            // print the IntBuffer
            System.out.println("\nIntBuffer ib1:  "
                               + Arrays.toString(ib1.array()));
  
            // Creating a read-only copy of IntBuffer
            // using asReadOnlyBuffer() method
            IntBuffer readOnlyib = ib.asReadOnlyBuffer();
  
            // print the IntBuffer
            System.out.print("\nReadOnlyBuffer IntBuffer: ");
  
            while (readOnlyib.hasRemaining())
                System.out.print(readOnlyib.get() + ", ");
  
            // try to change readOnlyib
            System.out.println("\n\nTrying to get the array"
                               + " from ReadOnlyib for editing");
  
            int[] ibarr = readOnlyib.array();
        }
  
        catch (IllegalArgumentException e) {
            System.out.println("IllegalArgumentException catched");
        }
  
        catch (ReadOnlyBufferException e) {
            System.out.println("Exception thrown: " + e);
        }
    }
}

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Output:

IntBuffer ib: [8, 0, 9, 0, 0, 0, 0, 0, 0, 0]

IntBuffer ib1:  [0, 4, 6, 0, 0]

ReadOnlyBuffer IntBuffer: 8, 0, 9, 0, 0, 0, 0, 0, 0, 0, 

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


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