FloatBuffer allocate() method in Java With Examples

Last Updated : 27 May, 2021

The allocate() method of java.nio.FloatBuffer Class is used to allocate a new float buffer next to the existing buffer. The new buffer’s position will be zero. Its limit will be its capacity. Its mark will be undefined. And each of its elements will be initialized to zero. It will have a backing array, and its array offset will be zero.
Syntax:

public static FloatBuffer allocate(int capacity)

Parameter: This method takes the new buffer’s capacity, in float, as a parameter.
Return Value: This method returns the new float buffer.
Exception: This method throws the IllegalArgumentException if the capacity is a negative integer.
Below program illustrates the allocate() method:
Examples 1:

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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 FloatBuffer
        int capacity = 10;
 
        // Creating the FloatBuffer
 
        // creating object of floatbuffer
        // and allocating size capacity
        FloatBuffer fb = FloatBuffer.allocate(capacity);
 
        // putting the value in floatbuffer
        fb.put(8.56F);
        fb.put(2, 9.61F);
 
        System.out.println("FloatBuffer: "
                           + Arrays.toString(fb.array()));
    }
}

Output:

FloatBuffer: [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]

Examples 2: To demonstrate IllegalArgumentException

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 FloatBuffer
        // by negative integer
        int capacity = -10;
 
        // Creating the FloatBuffer
        try {
 
            // creating object of floatbuffer
            // 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)

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