ArrayDeque pop() Method in Java

Last Updated : 10 Dec, 2018

The Java.util.ArrayDeque.pop() method in Java is used to pop an element from the deque. The element is popped from the top of the deque and is removed from the same. Syntax:

Array_Deque.pop()

Parameters: The method does not take any parameters. Return Value: This method returns the element present at the front of the Deque. Exceptions: The method throws NoSuchElementException is thrown if the deque is empty. Below programs illustrate the Java.util.ArrayDeque.pop() method: Program 1:

Java

// Java code to illustrate pop() import java.util.*;  public class ArrayDequeDemo {     public static void main(String args[])     {         // Creating an empty ArrayDeque         Deque<String> de_que = new ArrayDeque<String>();          // Use add() method to add elements         de_que.add("Welcome");         de_que.add("To");         de_que.add("Geeks");         de_que.add("For");         de_que.add("Geeks");          // Displaying the ArrayDeque         System.out.println("Initial ArrayDeque: " + de_que);          // Removing elements using pop() method         System.out.println("Popped element: " + de_que.pop());         System.out.println("Popped element: " + de_que.pop());          // Displaying the ArrayDeque after pop         System.out.println("Deque after operation "                            + de_que);     } }

Output:

  Initial ArrayDeque: [Welcome, To, Geeks, For, Geeks]  Popped element: Welcome  Popped element: To  Deque after operation [Geeks, For, Geeks]

Program 2:

Java

// Java code to illustrate pop() import java.util.*;  public class ArrayDequeDemo {     public static void main(String args[])     {         // Creating an empty ArrayDeque         Deque<Integer> de_que = new ArrayDeque<Integer>();          // Use add() method to add elements into the Deque         de_que.add(10);         de_que.add(15);         de_que.add(30);         de_que.add(20);         de_que.add(5);          // Displaying the ArrayDeque         System.out.println("Initial ArrayDeque: " + de_que);          // Removing elements using pop() method         System.out.println("Popped element: " + de_que.pop());         System.out.println("Popped element: " + de_que.pop());          // Displaying the ArrayDeque after pop         System.out.println("Deque after operation "                            + de_que);     } }

Output:

  Initial ArrayDeque: [10, 15, 30, 20, 5]  Popped element: 10  Popped element: 15  Deque after operation [30, 20, 5]

ArrayDeque pop() Method in Java

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