The java.util.ArrayDeque.clear() method removes all of the elements from this deque.
Following is the declaration for java.util.ArrayDeque.clear() method
public void clear()
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This method does not return any value.
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The following example shows the usage of java.util.ArrayDeque.clear() method.
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