int size ( ) This method returns the total number of elements of the underlying deque.
size ( ) method of Deque Interface in java.
In this section we will discuss how can size ( ) method be implemented in Deque interface in java.
Syntax
int size ( )
This method returns the total number of elements of the underlying deque.
Using this method you can find the number of elements of an existing deque. If deque contains more than Integer.MAX_VALUE elements, it returns the same.
Parameter Description
It does not take any argument, only returns integer (number of elements of a deque) value.
Example of size( ) method
In this example we will show you how does size( ) method work in Deque interface. In the following example at first we will insert elements by an add() method then after check their existance into the deque using isEmpty() method, and finally we will implement the size() method that returns the final size of deque.
Example:-
package devmanuals.com;
import java.util.Deque;
import java.util.LinkedList;
public class DequeSize {
public static void main (String args []){
int size;
Deque dq=new LinkedList();
dq.add(1);
dq.add(2);
dq.add(3);
dq.add(4);
dq.add(5);
dq.add(6);
System.out.println("Is deque empty ? "+dq.isEmpty());
if (dq != null)
{
System.out.println("Deque is : "+dq);
}
else
System.out.println("Deque have no elements " +dq);
size= dq.size();
System.out.println("Size of deque : "+size);
//When remove the elements from list
dq.clear();
System.out.println("Is Deque empty ? "+dq.isEmpty());
System.out.println("Deque have no elements " +dq);
System.out.println("Size of deque : " +dq.size());
}
}
Output :
|
Is deque empty ? false Deque is : [1, 2, 3, 4, 5, 6] Size of deque : 6 Is Deque empty ? true Deque have no elements [] Size of deque : 0 |
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