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:

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// 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()));
    }
}

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Output:

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

Program 2: To show NullPointerException

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// 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 negetive integer
        int capacity = -10;
  
        // Creating the ShortBuffer
        try {
  
            // creating object of shortbuffer
            // and allocating size with negative intger
            System.out.println("Trying to allocate a negetive integer");
  
            FloatBuffer fb = FloatBuffer.allocate(capacity);
        }
        catch (IllegalArgumentException e) {
            System.out.println("Exception thrown: " + e);
        }
    }
}

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Output:

Trying to allocate a negetive integer
Exception thrown: java.lang.IllegalArgumentException

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



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