Buffer hasRemaining() methods in Java with Examples

The hasRemaining() method of java.nio.Buffer class is used to tell whether there are any elements between the current position and the limit.

Syntax:

public final boolean hasRemaining()

Returns: This method will return true if, and only if, there is at least one element remaining in this buffer.

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

Examples 1:

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

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

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

        // Declaring the capacity of the ByteBuffer
        int capacity = 10;

        // creating object of bytebuffer
        // and allocating size capacity
        ByteBuffer bb = ByteBuffer.allocate(capacity);

        // putting the value in bytebuffer
        bb.put((byte)10);
        bb.put((byte)20);
        bb.rewind();

        // Typecast bytebuffer to Buffer
        Buffer buffer = (Buffer)bb;

        // checking buffer is backed by array or not
        boolean isRemain = buffer.hasRemaining();

        // checking if else condition
        if (isRemain)
            System.out.println("there is at least one "
                               + "element remaining "
                               + "in this buffer");
        else
            System.out.println("there is no "
                               + "element remaining "
                               + "in this buffer");
    }
}

Output:

there is at least one element remaining in this buffer

Examples 2:

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

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

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

        // Declaring the capacity of the ByteBuffer
        int capacity = 0;

        // creating object of bytebuffer
        // and allocating size capacity
        ByteBuffer bb = ByteBuffer.allocate(capacity);

        // Typecast bytebuffer to Buffer
        Buffer buffer = (Buffer)bb;

        // checking buffer is backed by array or not
        boolean isRemain = buffer.hasRemaining();

        // checking if else condition
        if (isRemain)
            System.out.println("there is at least one "
                               + "element remaining"
                               + " in this buffer");
        else
            System.out.println("there is no "
                               + "element remaining"
                               + " in this buffer");
    }
}

Output:

there is no element remaining in this buffer

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