DoubleBuffer get() methods in Java with Examples

The get() method of java.nio.DoubleBuffer Class is used to reads the double at the given buffer’s current position, and then increments the position.

Syntax:

public abstract double get()

Return Value: This method returns the double value at the buffer’s current position.

Exception: 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 FloatBuffer
        int capacity = 5;

        // Creating the FloatBuffer
        try {

            // creating object of floatbuffer
            // and allocating size capacity
            DoubleBuffer fb
                = DoubleBuffer.allocate(capacity);

            // putting the value in Doublebuffer
            fb.put(8.56D);
            fb.put(9.61D);
            fb.put(1.24D);
            fb.rewind();

            // print the DoubleBuffer
            System.out.println("Original DoubleBuffer:  "
                               + Arrays.toString(fb.array()));

            // Reads the double at this buffer's current position
            // using get() method
            double value = fb.get();

            // print the double value
            System.out.println("\nDouble Value: "
                               + value);

            // Reads the  double at this buffer's next position
            // using get() method
            double value1 = fb.get();

            // print the double value
            System.out.print("\nNext double 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 DoubleBuffer:  [8.56, 9.61, 1.24, 0.0, 0.0]

Double Value: 8.56

Next double Value: 9.61

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 DoubleBuffer
        int capacity = 3;

        // Creating the DoubleBuffer
        try {

            // creating object of Doublebuffer
            // and allocating size capacity
            DoubleBuffer fb = DoubleBuffer.allocate(capacity);

            // putting the value in Doublebuffer
            fb.put(8.56F);
            fb.put(9.61F);

            // print the DoubleBuffer
            System.out.println("Original DoubleBuffer:  "
                               + Arrays.toString(fb.array()));

            // Reads the Double at this buffer's current position
            // using get() method
            Double value = fb.get();

            // print the Double value
            System.out.println("\nDouble Value: " + value);

            // Reads the  Double 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 ");

            Double value1 = fb.get();

            // print the Double value
            System.out.print("\nNext Double 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 DoubleBuffer:  [8.5600004196167, 9.609999656677246, 0.0]

Double Value: 0.0

since the buffer current position is incremented to greater than its limit 
Exception throws: java.nio.BufferUnderflowException

Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/DoubleBuffer.html#get–