Buffer capacity() method in Java with Examples

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:

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// 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);
    }
}

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Output:

capacity is: 7

Examples 2:

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// 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);
    }
}

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Output:

capacity is: 5

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



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