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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 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 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]

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