ByteBuffer get() method in Java with Examples
Last Updated :
24 May, 2019
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
// 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
// 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
// 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
// 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
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