ByteBuffer arrayOffset() method in Java with Examples Last Updated : 20 Sep, 2018 Comments Improve Suggest changes Like Article Like Report The arrayOffset() method of java.nio.ByteBuffer class is used to return the offset within the given buffer's backing array of the first element of the buffer. If this buffer is backed by an array then buffer position p corresponds to array index p + arrayOffset(). Invoke the hasArray method before invoking this method in order to ensure that this buffer has an accessible backing array. Syntax : public final int arrayOffset() Return Value: This method returns the offset within this buffer's array of the first element of the buffer Exception:: This method throws the ReadOnlyBufferException, If this buffer is backed by an array but is read-only. Below are the examples to illustrate the arrayOffset() method: Example 1: Java // Java program to demonstrate // arrayOffset() method import java.nio.*; import java.util.*; public class GFG { public static void main(String[] args) { // Declaring the capacity of the ByteBuffer int capacity = 4; // Creating the ByteBuffer try { // creating object of ByteBuffer // and allocating size capacity ByteBuffer bb = ByteBuffer.allocate(capacity); // putting the int to byte typecast value in ByteBuffer bb.put((byte)20); bb.put((byte)30); bb.put((byte)40); bb.put((byte)50); bb.rewind(); // print the ByteBuffer System.out.println("ByteBuffer: " + Arrays.toString(bb.array())); // print the arrayOffset System.out.println("arrayOffset: " + bb.arrayOffset()); } catch (IllegalArgumentException e) { System.out.println("IllegalArgumentException catched"); } catch (ReadOnlyBufferException e) { System.out.println("Exception throws" + e); } } } Output: ByteBuffer: [20, 30, 40, 50] arrayOffset: 0 Example 2: Java // Java program to demonstrate // arrayOffset() method import java.nio.*; import java.util.*; public class GFG { public static void main(String[] args) { // Declaring the capacity of the ByteBuffer int capacity = 3; // Creating the ByteBuffer try { // creating object of ByteBuffer // and allocating size capacity ByteBuffer bb = ByteBuffer.allocate(capacity); // putting the value in ByteBuffer bb.put((byte)20); bb.put((byte)30); bb.put((byte)40); bb.rewind(); // Creating a read-only copy of ByteBuffer // using asReadOnlyBuffer() method ByteBuffer bb1 = bb.asReadOnlyBuffer(); // print the ByteBuffer System.out.print("Read only buffer : "); while (bb1.hasRemaining()) System.out.print(bb1.get() + ", "); // next line System.out.println(""); // print the arrayOffset System.out.println("\nTry to print the array offset" + " of read only buffer"); System.out.println("arrayOffset: " + bb1.arrayOffset()); } catch (IllegalArgumentException e) { System.out.println("Exception throws: " + e); } catch (ReadOnlyBufferException e) { System.out.println("Exception throws: " + e); } } } Output: Read only buffer : 20, 30, 40, Try to print the array offset of read only buffer Exception throws: java.nio.ReadOnlyBufferException Comment More infoAdvertise with us Next Article ByteBuffer arrayOffset() method in Java with Examples R rohitprasad3 Follow Improve Article Tags : Misc Java Java-Functions Java-NIO package Java-ByteBuffer +1 More Practice Tags : JavaMisc Similar Reads Buffer arrayOffset() method in Java with Examples The arrayOffset() method of java.nio.Buffer class is used to return the offset within the given buffer's backing array of the first element of the buffer. If this buffer is backed by an array then buffer position p corresponds to array index p + arrayOffset(). Invoke the hasArray method before invok 3 min read 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. It means that if this buffer is backed by an array, then buffer position p corresponds to array index p + arrayOffset(). Inorder to check whether 3 min read ByteBuffer array() method in Java with Examples The array() method of java.nio.ByteBuffer class is used to return the byte array that backs the taken buffer.Modifications to this buffer's content will cause the returned array's content to be modified, and vice versa.Invoke the hasArray() method before invoking this method in order to ensure that 3 min read Buffer array() methods in Java with Examples The array() method of java.nio.Buffer class is used to return the array that backs the taken buffer. This method is intended to allow array-backed buffers to be passed to native code more efficiently. Concrete subclasses provide more strongly-typed return values for this method. Modifications to thi 3 min read DoubleBuffer array() method in Java With Examples 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 3 min read Like