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CharBuffer asReadOnlyBuffer() method in Java
A read-only char buffer can be created using the contents of a buffer with the method asReadOnlyBuffer() in the class java.nio.CharBuffer. 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 {
CharBuffer buffer = CharBuffer.allocate(5);
buffer.put('A');
buffer.put('P');
buffer.put('P');
buffer.put('L');
buffer.put('E');
buffer.rewind();
System.out.println("The Original CharBuffer is: " + Arrays.toString(buffer.array()));
CharBuffer roBuffer = buffer.asReadOnlyBuffer();
System.out.println("The ReadOnlyBuffer CharBuffer 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 CharBuffer is: [A, P, P, L, E] The ReadOnlyBuffer CharBuffer is: A P P L E
Updated on: 30-Jul-2019
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