Java.util.ArrayDeque.clear() Method


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Description

The java.util.ArrayDeque.clear() method removes all of the elements from this deque.

Declaration

Following is the declaration for java.util.ArrayDeque.clear() method

public void clear()

Parameters

NA

Return Value

This method does not return any value.

Exception

NA

Example

The following example shows the usage of java.util.ArrayDeque.clear() method.

Live Demo
package com.tutorialspoint;

import java.util.ArrayDeque;
import java.util.Deque;

public class ArrayDequeDemo {
   public static void main(String[] args) {
     
      // create an empty array deque with an initial capacity
      Deque<Integer> deque = new ArrayDeque<Integer>(8);

      // use add() method to add elements in the deque
      deque.add(20);
      deque.add(30);
      deque.add(10);

      // let us print all the elements available in deque
      for (Integer number : deque) {
         System.out.println("Number = " + number);
      }      

      // finding size of this deque
      int retval = deque.size();
      System.out.println("Deque consists of "+ retval +" elements");

      System.out.println("Performing clear operation !!");
      deque.clear();
      retval = deque.size();
      System.out.println("Now, deque consists of "+ retval +" elements");
   }
}   

Let us compile and run the above program, this will produce the following result −

Number = 20
Number = 30
Number = 10
Deque consists of 3 elements
Performing clear operation !!
Now, deque consists of 0 elements

java_util_arraydeque.htm

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