Java Long class

Java Deque size() Method

Last Updated : 17 Mar 2025

The size() method of Deque interface is used to return the total number of elements present in the given deque.

Syntax:

Parameter:

The above method requires only one parameter:

The element 'o' that needs to be removed.

Specified by:

size in interface Collection<E>

Return:

The above method is used to return the total number of elements present in the given deque.

Example 1

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequeresizeExample1 {
   public static void main(String[] args) {
	   Deque<Float> deque = new ArrayDeque<>();
	    deque.add(55.8f); 
	    deque.add(22.3f);
	    deque.add(89f);
	    deque.add(22.3f);  
	  System.out.println("The final deque is given as : ");   
	for (Float float1 : deque) {
		System.out.println(float1);
	}
	int size = deque.size();
	System.out.println("The size of the deque is : "+size);
   }
}

Output:

The final deque is given as : 
55.8
22.3
89.0
22.3
The size of the deque is : 4

Example 2

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequeresizeExample2 {
   public static void main(String[] args) {
	   Deque<String> deque = new ArrayDeque<>();
	    deque.add("Computer"); 
	    deque.add("Programming");
	    deque.add("Language");
	  System.out.println("The final deque is given as : ");   
	for (String string : deque) {
		System.out.println(string);
	}
	int size = deque.size();
	System.out.println("The size of the deque is : "+size);
   }
}

Output:

The final deque is given as : 
Computer
Programming
Language
The size of the deque is : 3

Example 3

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequeresizeExample3 {
   public static void main(String[] args) {
	   Deque<Character> deque = new ArrayDeque<>();
	    deque.add('A'); 
	    deque.add('B');
	    deque.add('C');
	    deque.add('D');
	    deque.add('E');
	System.out.println("The final deque is given as : "+deque);   
	 int size = deque.size();
	 System.out.println("The size of the deque is : "+size);
   }
}

Output:

The final deque is given as : [A, B, C, D, E]
The size of the deque is : 5

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Java Deque size() Method

Syntax:

Parameter:

Specified by:

Return:

Example 1

Example 2

Example 3

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Java Deque size() Method

Syntax:

Parameter:

Specified by:

Return:

Example 1

Example 2

Example 3

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