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);
}
} |
Output:
capacity is: 5
Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/Buffer.html#capacity–