The asReadOnlyBuffer() method of java.nio.DoubleBuffer Class is used to create a new, read-only double 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 DoubleBuffer asReadOnlyBuffer()
Return Value: This method returns the new, read-only double buffer with the same content as that of this buffer.
Below are the examples to illustrate the asReadOnlyBuffer() method:
Example 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 DoubleBuffer int capacity = 10; // Creating the DoubleBuffer try { // creating object of floatbuffer // and allocating size capacity DoubleBuffer db = DoubleBuffer.allocate(capacity); // putting the value in floatbuffer db.put(8.56); db.put(2, 9.61); db.rewind(); // print the DoubleBuffer System.out.println("Original DoubleBuffer: " + Arrays.toString(db.array())); // Creating a read-only copy of DoubleBuffer // using asReadOnlyBuffer() method DoubleBuffer floatBuffer = db.asReadOnlyBuffer(); // print the DoubleBuffer System.out.print("\nReadOnlyBuffer DoubleBuffer: "); while (floatBuffer.hasRemaining()) System.out.print(floatBuffer.get() + ", "); } catch (IllegalArgumentException e) { System.out.println("IllegalArgumentException catched"); } catch (ReadOnlyBufferException e) { System.out.println("ReadOnlyBufferException catched"); } }} |
Original DoubleBuffer: [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] ReadOnlyBuffer DoubleBuffer: 8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
Example 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 db int capacity1 = 10; // Declaring the capacity of the db1 int capacity2 = 5; // Creating the DoubleBuffer try { // // db // // creating object of Doublebuffer db // and allocating size capacity DoubleBuffer db = DoubleBuffer.allocate(capacity1); // putting the value in db db.put(8.56); db.put(2, 9.61); db.rewind(); // print the DoubleBuffer System.out.println("DoubleBuffer db: " + Arrays.toString(db.array())); // // db1 // // creating object of Doublebuffer db1 // and allocating size capacity DoubleBuffer db1 = DoubleBuffer.allocate(capacity2); // putting the value in db1 db1.put(1, 4.56); db1.put(2, 6.45); db1.rewind(); // print the DoubleBuffer System.out.println("\nDoubleBuffer db1: " + Arrays.toString(db1.array())); // Creating a read-only copy of DoubleBuffer // using asReadOnlyBuffer() method DoubleBuffer readOnlyDb = db.asReadOnlyBuffer(); // print the DoubleBuffer System.out.print("\nReadOnlyBuffer DoubleBuffer: "); while (readOnlyDb.hasRemaining()) System.out.print(readOnlyDb.get() + ", "); // try to change readOnlyDb System.out.println("\n\nTrying to get the array" + " from ReadOnlyDb for editing"); Arrays.toString(readOnlyDb.array()); } catch (IllegalArgumentException e) { System.out.println("IllegalArgumentException catched"); } catch (ReadOnlyBufferException e) { System.out.println("Exception thrown: " + e); } }} |
DoubleBuffer db: [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] DoubleBuffer db1: [0.0, 4.56, 6.45, 0.0, 0.0] ReadOnlyBuffer DoubleBuffer: 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 ReadOnlyDb for editing Exception thrown: java.nio.ReadOnlyBufferException
