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DoubleBuffer array() method in Java With Examples

  • Last Updated : 04 Dec, 2018

The array() method of java.nio.DoubleBuffer Class is used to Return the double 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 :

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public final float[] array()

Return Value: This method returns the array that backs this buffer.

Exception: 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 DoubleBuffer
        int capacity = 10;
  
        // Creating the DoubleBuffer
        try {
  
            // creating object of Doublebuffer
            // and allocating size capacity
            DoubleBuffer db = DoubleBuffer.allocate(capacity);
  
            // putting the value in Doublebuffer
            db.put(8.56F);
            db.put(2, 9.61F);
            db.rewind();
  
            // getting array from db DoubleBuffer using array() method
            double[] dbb = db.array();
  
            // printing the DoubleBuffer db
            System.out.println("DoubleBuffer:  "
                               + Arrays.toString(dbb));
        }
  
        catch (IllegalArgumentException e) {
  
            System.out.println("IllegalArgumentException catched");
        }
  
        catch (ReadOnlyBufferException e) {
  
            System.out.println("ReadOnlyBufferException catched");
        }
    }
}
Output:
DoubleBuffer:  [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]

Example 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 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(9.56F);
            db.put(2, 7.61F);
            db.put(3, 4.61F);
            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, 4.56F);
            db1.put(2, 6.45F);
            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);
        }
    }
}
Output:
DoubleBuffer db: [9.5600004196167, 0.0, 7.610000133514404, 4.610000133514404, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]

DoubleBuffer db1:  [0.0, 4.559999942779541, 6.449999809265137, 0.0, 0.0]

ReadOnlyBuffer DoubleBuffer: 9.5600004196167, 0.0, 7.610000133514404, 4.610000133514404, 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



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