Buffer isDirect() methods in Java with Examples

The isDirect() method of java.nio.Buffer Class is used to tell whether or not this buffer is direct.

Syntax:

public abstract boolean isDirect()

Return Value: This method returns true if, and only if, this buffer is direct.

Below are the examples to illustrate the isDirect() method:

Examples 1:

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

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

public class GFG {
    public static void main(String[] args)
    {
        // defining and allocating ByteBuffer
        // using allocate() method
        ByteBuffer byteBuffer
            = ByteBuffer.allocateDirect(4);

        // Typecast byteBuffer to buffer
        Buffer buffer = (Buffer)byteBuffer;

        // check the Buffer
        // using isDirect() method
        boolean val = buffer.isDirect();

        // checking the condition
        if (val)
            System.out.println("buffer is direct");
        else
            System.out.println("buffer is not direct");
    }
}

Output:

buffer is direct

Examples 2:

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

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

public class GFG {
    public static void main(String[] args)
    {
        // defining and allocating ByteBuffer
        // using allocate() method
        ByteBuffer byteBuffer = ByteBuffer.allocate(4);

        // Typecast byteBuffer to buffer
        Buffer buffer = (Buffer)byteBuffer;

        // check the byteBuffer
        // using isDirect() method
        boolean val = buffer.isDirect();

        // checking the condition
        if (val)
            System.out.println("buffer is direct");
        else
            System.out.println("buffer is not direct");
    }
}

Output:

buffer is not direct

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