get()
The get() method of java.nio.ByteBuffer class is used to read the byte at the buffer’s current position, and then increments the position.
Syntax :
public abstract byte get()
Return Value: This method returns the byte at the buffer’s current position.
Throws: This method throws BufferUnderflowException – If the buffer’s current position is not smaller than its limit, then this exception is thrown.
Below are the examples to illustrate the get() method:
Examples 1:
// Java program to demonstrate// get() method import java.nio.*;import java.util.*; public class GFG { public static void main(String[] args) { // Declaring the capacity of the ByteBuffer int capacity = 5; // Creating the ByteBuffer try { // creating object of ByteBuffer // and allocating size capacity ByteBuffer bb = ByteBuffer.allocate(capacity); // putting the int to byte value in ByteBuffer bb.put((byte)20); bb.put((byte)30); bb.put((byte)40); bb.rewind(); // print the ByteBuffer System.out.println("Original ByteBuffer: " + Arrays.toString(bb.array())); // Reads the byte at this buffer's current position // using get() method byte value = bb.get(); // print the byte value System.out.println("\nByte Value: " + value); // Reads the Byte at this buffer's next position // using get() method byte value1 = bb.get(); // print the Float value System.out.print("\nNext Byte Value: " + value1); } catch (IllegalArgumentException e) { System.out.println("\nException Thrown : " + e); } catch (ReadOnlyBufferException e) { System.out.println("\nException Thrown : " + e); } catch (BufferUnderflowException e) { System.out.println("\nException Thrown : " + e); } }} |
Output:
Original ByteBuffer: [20, 30, 40, 0, 0] Byte Value: 20 Next Byte Value: 30
Examples 2:
// Java program to demonstrate// get() 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 int to byte typecast value in ByteBuffer bb.put((byte)20); bb.put((byte)30); // print the ByteBuffer System.out.println("Original ByteBuffer: " + Arrays.toString(bb.array())); // Reads the byte at this buffer's current position // using get() method byte value = bb.get(); // print the byte value System.out.println("\nByte Value: " + value); // Reads the Byte at this buffer's next position // using get() method System.out.print("\nsince the buffer current position is incremented"); System.out.print(" to greater than its limit "); byte value1 = bb.get(); // print the Byte value System.out.print("\nNext Byte Value: " + value1); } catch (IllegalArgumentException e) { System.out.println("\nIllegalArgumentException catched"); } catch (ReadOnlyBufferException e) { System.out.println("\nReadOnlyBufferException catched"); } catch (BufferUnderflowException e) { System.out.println("\nException throws : " + e); } }} |
Output:
Original ByteBuffer: [20, 30, 0] Byte Value: 0 since the buffer current position is incremented to greater than its limit Exception throws : java.nio.BufferUnderflowException
get(int index)
The get(int index) method of ByteBuffer is used to read the article at a specified index.
Syntax :
public abstract byte get(int index)
Parameters: This method takes index (The index from which the Byte will be read) as a parameter.
Return Value: This method returns the Byte value at the given index.
Exception: This method throws IndexOutOfBoundsException. If index is negative or not smaller than the buffer’s limit this exception is thrown.
Below are the examples to illustrate the get(int index) method:
Examples 1:
// Java program to demonstrate// get(int index) 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 int to byte typecast value in ByteBuffer bb.put((byte)20); bb.put((byte)30); bb.put((byte)40); // print the ByteBuffer System.out.println("Original ByteBuffer: " + Arrays.toString(bb.array())); // Reads the Byte at the index 0 of the Bytebuffer // using get() method byte value0 = bb.get(0); // print the Byte value System.out.println("\nByte Value at index 0: " + value0); // Reads the Byte at the index 1 of the Bytebuffer // using get() method byte value1 = bb.get(1); // print the Byte value System.out.println("\nByte Value at index 1: " + value1); // Reads the Byte at the index 2 of the Bytebuffer // using get() method byte value2 = bb.get(2); // print the Byte value System.out.println("\nByte Value at index 2: " + value2); } catch (IllegalArgumentException e) { System.out.println("\nIllegalArgumentException catched"); } catch (IndexOutOfBoundsException e) { System.out.println("\nReadOnlyBufferException catched"); } catch (BufferUnderflowException e) { System.out.println("\nException throws : " + e); } }} |
Output:
Original ByteBuffer: [20, 30, 40] Byte Value at index 0: 20 Byte Value at index 1: 30 Byte Value at index 2: 40
Examples 2:
// Java program to demonstrate// get(int index) 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 int to byte typecast value in ByteBuffer bb.put((byte)20); bb.put((byte)30); bb.put((byte)40); // print the ByteBuffer System.out.println("Original ByteBuffer: " + Arrays.toString(bb.array())); // Reads the Byte at the index 0 of the Bytebuffer // using get() method byte value0 = bb.get(0); // print the Byte value System.out.println("\nByte Value at index 0: " + value0); // Reads the Byte at the index 1 of the Bytebuffer // using get() method byte value1 = bb.get(1); // print the Byte value System.out.println("\nByte Value at index 1: " + value1); // Reads the Byte at the index 4 of the Bytebuffer // using get() method System.out.println("\nTrying to get the byte" + " of index greater than its limit "); byte value2 = bb.get(4); // print the Byte value System.out.println("\nByte Value at index 4: " + value2); } catch (IndexOutOfBoundsException e) { System.out.println("\nException throws : " + e); } catch (BufferUnderflowException e) { System.out.println("\nException throws : " + e); } }} |
Output:
Original ByteBuffer: [20, 30, 40] Byte Value at index 0: 20 Byte Value at index 1: 30 Trying to get the byte of index greater than its limit Exception throws : java.lang.IndexOutOfBoundsException
