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ArrayDeque remove() Method in Java

Last Updated : 10 Dec, 2018

1. The Java.util.ArrayDeque.remove() method is used to remove the element present at the head of the Deque. Syntax:

   Array_Deque.remove()

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

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

   Output:

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

   Program 2: Java

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

   Output:

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

2. The Java.util.ArrayDeque.remove(Object) method is used to remove a particular element from an ArrayDeque. Syntax:

   Priority_Queue.remove(Object O)

   Parameters: The parameter O is of the type of ArrayDeque and specifies the element to be removed from the ArrayDeque. Return Value: This method returns True if the specified element is present in the Deque else it returns False. Below programs illustrate the Java.util.ArrayDeque.remove() method: Program 1: Java

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

   Output:

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

   Program 2: Java

   // Java code to illustrate remove()
   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 remove() method
           de_que.remove(30);
           de_que.remove(5);
   
           // Displaying the ArrayDeque after removal
           System.out.println("ArrayDeque after removing "
                              + "elements: " + de_que);
       }
   }
   

   Output:

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

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