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ByteBuffer asReadOnlyBuffer() method in Java
A read-only byte buffer can be created using the contents of a buffer with the method asReadOnlyBuffer() in the class java.nio.ByteBuffer. The new buffer cannot have any modifications as it is a read-only buffer. However, the capacity, positions, limits etc. of the new buffer are the same as the previous buffer.
A program that demonstrates this is given as follows −
Example
import java.nio.*;
import java.util.*;
public class Demo {
public static void main(String[] args) {
int n = 5;
try {
ByteBuffer buffer = ByteBuffer.allocate(5);
buffer.put((byte) 1);
buffer.put((byte) 2);
buffer.put((byte) 3);
buffer.put((byte) 4);
buffer.put((byte) 5);
buffer.rewind();
System.out.println("The Original ByteBuffer is: " + Arrays.toString(buffer.array()));
ByteBuffer roBuffer = buffer.asReadOnlyBuffer();
System.out.println("The ReadOnlyBuffer ByteBuffer is: ");
while (roBuffer.hasRemaining())
System.out.print(roBuffer.get() + " ");
} catch (IllegalArgumentException e) {
System.out.println("Error!!! IllegalArgumentException");
} catch (ReadOnlyBufferException e) {
System.out.println("Error!!! ReadOnlyBufferException");
}
}
}Output
The Original ByteBuffer is: [1, 2, 3, 4, 5] The ReadOnlyBuffer ByteBuffer is: 1 2 3 4 5
Updated on: 30-Jul-2019
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