Buffer capacity() method in Java with Examples

Last Updated : 18 Jul, 2019

The capacity() method of java.nio.Buffer Class is used to return this buffer’s capacity.

Syntax:

public final int capacity()

Return Value: The capacity of this buffer

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

Examples 1:

// Java program to demonstrate 
// capacity() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
        // creating object of ByteBuffer 
        // and allocating size capacity 
        ByteBuffer bb = ByteBuffer.allocate(7); 
  
        // putting the int to byte typecast 
        // value in ByteBuffer 
        bb.put((byte)20); 
        bb.put((byte)30); 
        bb.put((byte)40); 
        bb.put((byte)50); 
  
        // Typecasting ByteBuffer into Buffer 
        Buffer bb1 = (Buffer)bb; 
  
        // getting capacity of Buffer 
        // using capacity() method 
        int cap = bb1.capacity(); 
  
        // display the result 
        System.out.println("capacity is: "
                           + cap); 
    } 
} 

Output:

capacity is: 7

Examples 2:

// Java program to demonstrate 
// capacity() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
        // Declaring and initializing byte array 
        byte[] byt = { (byte)20, (byte)30, 
                       (byte)40, (byte)50, 
                       (byte)60 }; 
  
        // creating object of ByteBuffer 
        // and allocating size capacity 
        ByteBuffer bb = ByteBuffer.wrap(byt); 
  
        // Typecasting ByteBuffer into Buffer 
        Buffer bb1 = (Buffer)bb; 
  
        // getting capacity of Buffer 
        // using capacity() method 
        int cap = bb1.capacity(); 
  
        // display the result 
        System.out.println("capacity is: "
                           + cap); 
    } 
} 