Java Deque element() Method with Examples

by Online Tutorials Library July 22, 2022

Java Deque element() Method

The element() method of Java Deque Interface retrieves but not remove the head of the queue which is represented by the deque. The above method differs from the peek only in one way that it throws an exception only if the deque is empty.

Specified by:

element in interfaceQueue<E>

Syntax:

Parameter:

N.A.

Return:

The above method returns the head of the deque represented by the given deque.

Throw:

NoSuchElementException– if the given deque is emplty.

Example 1

  import java.util.ArrayDeque;  import java.util.Deque;  public class JavaDequeelementExample1 {       public static void main(String[] args) {       Deque<String> deque = new ArrayDeque<>();  deque.add(“FAT”);  deque.add(“CAO”);  deque.add(“JAVA”);  deque.add(“DBMS”);  System.out.println(“The final queue is : “+deque);  String val = deque.element();     System.out.println(“The required answer : “+val);       }  }  

Test it Now

Output:

The final queue is : [FAT, CAO, JAVA, DBMS]  The required answer : FAT

Example 2

  import java.util.ArrayDeque;  import java.util.Deque;  public class JavaDequeelementExample2 {     public static void main(String[] args) {  Deque<Character> deque = new ArrayDeque<>();  System.out.println(“The list of the elements is given as : “);  deque.add(‘k’);  deque.add(‘p’);  deque.add(‘m’);  deque.add(‘t’);  System.out.println(deque);  Character val = deque.element();     System.out.println(“The required answer : “+val);      }  }  

Test it Now

Output:

The list of the elements is given as :   [k, p, m, t]  The required answer : k

Example 3

  import java.util.ArrayDeque;  import java.util.Deque;  public class JavaDequeelementExample3 {     public static void main(String[] args) {  Deque<Integer> deque = new ArrayDeque<>();  System.out.print(“The list of the elements is given as : “);  deque.add(2);  deque.add(3);  deque.add(4);  deque.add(5);  System.out.println(deque);  Integer val = deque.element();     System.out.println(“The required answer : “+val);      }  }  

Test it Now

Output:

The list of the elements is given as : [2, 3, 4, 5]  The required answer : 2

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Java Deque element() Method with Examples

Java Deque element() Method

Specified by:

Syntax:

Parameter:

Return:

Throw:

Example 1

Example 2

Example 3

Java ConcurrentHashMap putIfAbsent() Method

Java Abstract Keyword

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