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ArrayDeque clear() Method in Java

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  • Last Updated : 10 Dec, 2018
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The Java.util.ArrayDeque.clear() method in Java is used to remove all of the elements from the Deque. Using the clear() method only clears all the element from the deque and does not delete the deque. In other words, it can be said that the clear() method is used to only empty an existing ArrayDeque.

Syntax:

Array_Deque.clear()

Parameters: The method does not take any parameter.

Return Value: The function does not return any value.

Below programs illustrate the Java.util.ArrayDeque.clear() method:
Program 1:




// Java code to illustrate clear()
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("4");
        de_que.add("Geeks");
  
        // Displaying the ArrayDeque
        System.out.println("ArrayDeque: " + de_que);
  
        // Clearing the Deque
        de_que.clear();
  
        // Displaying the Deque
        System.out.println("ArrayDeque: " + de_que);
    }
}

Output:

ArrayDeque: [Welcome, To, Geeks, 4, Geeks]
ArrayDeque: []

Program 2:




// Java code to illustrate clear()
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("ArrayDeque: " + de_que);
  
        // Clearing the Deque
        de_que.clear();
  
        // Displaying the Deque
        System.out.println("ArrayDeque: " + de_que);
    }
}

Output:

ArrayDeque: [10, 15, 30, 20, 5]
ArrayDeque: []

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