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ByteBuffer get() method in Java with Examples

  • Last Updated : 24 May, 2019

get()

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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



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