The asReadOnlyBuffer() method of java.nio.LongBuffer Class is used to create a new, read-only Long 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 LongBuffer asReadOnlyBuffer()
Return Value: This method returns the new, read-only Long buffer with the same content as that of this buffer.
Below are the examples to illustrate the asReadOnlyBuffer() method:
Examples 1:
// 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 LongBuffer int capacity = 10; // Creating the LongBuffer try { // creating object of Longbuffer // and allocating size capacity LongBuffer ib = LongBuffer.allocate(capacity); // putting the value in Longbuffer ib.put(8); ib.put(2, 9); ib.rewind(); // prLong the LongBuffer System.out.println("Original LongBuffer: " + Arrays.toString(ib.array())); // Creating a read-only copy of LongBuffer // using asReadOnlyBuffer() method LongBuffer LongBuffer = ib.asReadOnlyBuffer(); // prLong the LongBuffer System.out.print("\nReadOnlyBuffer LongBuffer: "); while (LongBuffer.hasRemaining()) System.out.print(LongBuffer.get() + ", "); } catch (IllegalArgumentException e) { System.out.println("IllegalArgumentException catched"); } catch (ReadOnlyBufferException e) { System.out.println("ReadOnlyBufferException catched"); } }} |
Original LongBuffer: [8, 0, 9, 0, 0, 0, 0, 0, 0, 0] ReadOnlyBuffer LongBuffer: 8, 0, 9, 0, 0, 0, 0, 0, 0, 0,
Examples 2:
// 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 LongBuffer try { // creating object of Longbuffer ib // and allocating size capacity LongBuffer ib = LongBuffer.allocate(capacity1); // putting the value in ib ib.put(8); ib.put(2, 9); ib.rewind(); // prLong the LongBuffer System.out.println("LongBuffer ib: " + Arrays.toString(ib.array())); // ib1 // creating object of Longbuffer ib1 // and allocating size capacity LongBuffer ib1 = LongBuffer.allocate(capacity2); // putting the value in ib1 ib1.put(1, 4); ib1.put(2, 6); ib1.rewind(); // prLong the LongBuffer System.out.println("\nLongBuffer ib1: " + Arrays.toString(ib1.array())); // Creating a read-only copy of LongBuffer // using asReadOnlyBuffer() method LongBuffer readOnlyib = ib.asReadOnlyBuffer(); // prLong the LongBuffer System.out.print("\nReadOnlyBuffer LongBuffer: "); 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"); } catch (IllegalArgumentException e) { System.out.println("IllegalArgumentException catched"); } catch (ReadOnlyBufferException e) { System.out.println("Exception thrown: " + e); } }} |
LongBuffer ib: [8, 0, 9, 0, 0, 0, 0, 0, 0, 0] LongBuffer ib1: [0, 4, 6, 0, 0] ReadOnlyBuffer LongBuffer: 8, 0, 9, 0, 0, 0, 0, 0, 0, 0, Trying to get the array from ReadOnlyib for editing
