DoubleBuffer array() method in Java With Examples Last Updated : 04 Dec, 2018 Comments Improve Suggest changes Like Article Like Report 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 : 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 // 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 // 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 Comment More infoAdvertise with us Next Article DoubleBuffer array() method in Java With Examples pawan_asipu Follow Improve Article Tags : Misc Java Java-Functions Java-NIO package Java-DoubleBuffer +1 More Practice Tags : JavaMisc Similar Reads DoubleBuffer arrayOffset() method in Java With Examples The arrayOffset() method of java.nio.DoubleBuffer class is used to return the offset within the buffer’s backing array of the first element of the buffer. 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