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DoubleBuffer get() methods in Java with Examples

Last Updated : 04 Oct, 2019
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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 
// 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 
// 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--

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