ArrayDeque removeFirst() Method in Java

The Java.util.ArrayDeque.removeFirst() method is used to remove the first element of the Deque.

Syntax:

Array_Deque.removeFirst()

Parameters: The method does not take any parameters.



Return Value: This method returns the first element of the Deque after removing it.

Exceptions: The method throws NoSuchElementException is thrown if the deque is empty.

Below programs illustrate the Java.util.ArrayDeque.removeFirst() method:

Program 1:

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// Java code to illustrate removeFirst()
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 into the Deque
        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 removeFirst() method
        de_que.removeFirst();
        de_que.removeFirst();
        de_que.removeFirst();
  
        // Displaying the ArrayDeque after removal
        System.out.println("ArrayDeque after removing "
                           + "elements: " + de_que);
    }
}

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Output:

Initial ArrayDeque: [Welcome, To, Geeks, For, Geeks]
ArrayDeque after removing elements: [For, Geeks]

Program 2:

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// Java code to illustrate removeFirst()
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 removeFirst() method
        de_que.removeFirst();
        de_que.removeFirst();
  
        // Displaying the ArrayDeque after removal
        System.out.println("ArrayDeque after removing "
                           + "elements: " + de_que);
    }
}

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Output:

Initial ArrayDeque: [10, 15, 30, 20, 5]
ArrayDeque after removing elements: [30, 20, 5]


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