ShortBuffer allocate() method in Java With Examples

The allocate() method of java.nio.ShortBuffer Class is used to allocate a new short buffer.
The position of the new Buffer will be zero & it’s limit is its capacity, though the mark is undefined, and each of its elements is initialized to zero. It will be having a backing array, and the array offset as zero.
Syntax: 

public static ShortBuffer allocate(int capacity)

Parameters: The method accepts a mandatory parameter capacity which specifies the capacity of the new buffer, in shorts.
Return Value: This method returns the new ShortBuffer.
Exception: This method throws the IllegalArgumentException, if the capacity is a negative integer.
Below programs illustrate the use of allocate() method :
Program 1:

Java

// Java program to demonstrate
// allocate() method

import java.nio.*;
import java.util.*;

public class GFG {
    public static void main(String[] args)
    {

        // Declaring the capacity of the ShortBuffer
        int capacity = 5;

        // Creating the ShortBuffer

        // creating object of Shortbuffer
        // and allocating size capacity
        ShortBuffer sb = ShortBuffer.allocate(capacity);

        // putting the value in Shortbuffer
        sb.put((short)10000);
        sb.put((short)10640);
        sb.put((short)10189);
        sb.put((short)-2000);
        sb.put((short)-16780);

        // Printing the ShortBuffer
        System.out.println("ShortBuffer: "
                           + Arrays.toString(sb.array()));
    }
}

Output:

ShortBuffer: [10000, 10640, 10189, -2000, -16780]

Program 2: To show NullPointerException

Java

// Java program to demonstrate
// allocate() method

import java.nio.*;
import java.util.*;

public class GFG {
    public static void main(String[] args)
    {

        // Declaring the capacity of the ShortBuffer
        // by negative integer
        int capacity = -10;

        // Creating the ShortBuffer
        try {

            // creating object of shortbuffer
            // and allocating size with negative integer
            System.out.println("Trying to allocate a negative integer");

            FloatBuffer fb = FloatBuffer.allocate(capacity);
        }
        catch (IllegalArgumentException e) {
            System.out.println("Exception thrown: " + e);
        }
    }
}

Output

Trying to allocate a negative integer
Exception thrown: java.lang.IllegalArgumentException: capacity < 0: (-10 < 0)

Reference: https://docs.oracle.com/javase/7/docs/api/java/nio/ShortBuffer.html#allocate()