The array() method of java.nio.FloatBuffer Class is used to Return the float array that backs this buffer. Modifications to this buffer’s content will cause the returned array’s content to be modified, and vice versa. Invoke() the hasArray() method are used before invoking this method in order to ensure that this buffer has an accessible backing array
Syntax :
public final float[] array()
Return Value: This method returns the array that backs this buffer.
Throws: This method throws the ReadOnlyBufferException(If this buffer is backed by an array but is read-only)
Below program illustrates the array() method:
Examples 1:
// Java program to demonstrate// array() method import java.nio.*;import java.util.*; public class GFG { public static void main(String[] args) { // Declaring the capacity of the FloatBuffer int capacity = 10; // Creating the FloatBuffer try { // creating object of floatbuffer // and allocating size capacity FloatBuffer fb = FloatBuffer.allocate(capacity); // putting the value in floatbuffer fb.put(8.56F); fb.put(2, 9.61F); fb.rewind(); // getting array from fb FloatBuffer using array() method float[] fbb = fb.array(); // printing the FloatBuffer fb System.out.println("FloatBuffer: " + Arrays.toString(fbb)); } catch (IllegalArgumentException e) { System.out.println("IllegalArgumentException catched"); } catch (ReadOnlyBufferException e) { System.out.println("ReadOnlyBufferException catched"); } }} |
Output:
FloatBuffer: [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
Examples 2:
// Java program to demonstrate// array() method import java.nio.*;import java.util.*; public class GFG { public static void main(String[] args) { // Declaring the capacity of the fb int capacity1 = 10; // Declaring the capacity of the fb1 int capacity2 = 5; // Creating the FloatBuffer try { // // fb // // creating object of floatbuffer fb // and allocating size capacity FloatBuffer fb = FloatBuffer.allocate(capacity1); // putting the value in fb fb.put(9.56F); fb.put(2, 7.61F); fb.put(3, 4.61F); fb.rewind(); // print the FloatBuffer System.out.println("FloatBuffer fb: " + Arrays.toString(fb.array())); // // fb1 // // creating object of floatbuffer fb1 // and allocating size capacity FloatBuffer fb1 = FloatBuffer.allocate(capacity2); // putting the value in fb1 fb1.put(1, 4.56F); fb1.put(2, 6.45F); fb1.rewind(); // print the FloatBuffer System.out.println("\nFloatBuffer fb1: " + Arrays.toString(fb1.array())); // Creating a read-only copy of FloatBuffer // using asReadOnlyBuffer() method FloatBuffer readOnlyFb = fb.asReadOnlyBuffer(); // print the FloatBuffer System.out.print("\nReadOnlyBuffer FloatBuffer: "); while (readOnlyFb.hasRemaining()) System.out.print(readOnlyFb.get() + ", "); // try to change readOnlyFb System.out.println("\n\nTrying to get the array" + " from ReadOnlyFb for editing"); float[] fbarr = readOnlyFb.array(); } catch (IllegalArgumentException e) { System.out.println("IllegalArgumentException catched"); } catch (ReadOnlyBufferException e) { System.out.println("Exception thrown: " + e); } }} |
Output:
FloatBuffer fb: [9.56, 0.0, 7.61, 4.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] FloatBuffer fb1: [0.0, 4.56, 6.45, 0.0, 0.0] ReadOnlyBuffer FloatBuffer: 9.56, 0.0, 7.61, 4.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, Trying to get the array from ReadOnlyFb for editing Exception thrown: java.nio.ReadOnlyBufferException
