The java.util.concurrent.ConcurrentLinkedDeque.isEmpty() is an in-built function in Java which checks whether the deque contains elements or not.
Syntax:
public boolean isEmpty()
Parameters: The function does not accepts any parameter.
Return: This method returns a boolean value stating whether this deque is empty or not.
Below programs illustrate the ConcurrentLinkedDeque.isEmpty() method:
Example: 1
// Java Program Demonstrate// isEmpty() method of ConcurrentLinkedDeque  import java.util.concurrent.*;  class ConcurrentLinkedDequeDemo {    public static void main(String[] args)    {        ConcurrentLinkedDeque<String> cld            = new ConcurrentLinkedDeque<String>();          // Displaying the existing LinkedDeque        System.out.println("ConcurrentLinkedDeque: "                           + cld);          // Check if the queue is empty        // using isEmpty() method        System.out.println("Is deque empty: "                           + cld.isEmpty());    }} |
Output:
ConcurrentLinkedDeque: [] Is deque empty: true
Example: 2
// Java Program Demonstrate// isEmpty() method of ConcurrentLinkedDeque  import java.util.concurrent.*;  class ConcurrentLinkedDequeDemo {    public static void main(String[] args)    {        ConcurrentLinkedDeque<String> cld            = new ConcurrentLinkedDeque<String>();          cld.add("GFG");        cld.add("Gfg");        cld.add("Lazyroar");        cld.add("Geeks");          // Displaying the existing LinkedDeque        System.out.println("ConcurrentLinkedDeque: "                           + cld);          // Check if the queue is empty        // using isEmpty() method        System.out.println("Is deque empty: "                           + cld.isEmpty());    }} |
Output:
ConcurrentLinkedDeque: [GFG, Gfg, Lazyroar, Geeks] Is deque empty: false
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