ConcurrentLinkedDeque clear() method in Java

Last Updated : 19 Dec, 2018

The java.util.concurrent.ConcurrentLinkedDeque.clear() method is an inbuilt method in Java which removes the elements in the Deque.

Syntax:

public void clear()

Parameters: The method do not accepts any parameter.

Return Value: The function does not return anything

Below programs illustrate the ConcurrentLinkedDeque.clear() method:

Program 1:

// Java Program to Demonstrate clear() 
// method of ConcurrentLinkedDeque 
  
import java.util.concurrent.*; 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        // Creating an empty Deque 
        ConcurrentLinkedDeque<String> cld 
            = new ConcurrentLinkedDeque<String>(); 
  
        // Add elements into the Deque 
        cld.add("Welcome"); 
        cld.add("To"); 
        cld.add("Geeks"); 
        cld.add("4"); 
        cld.add("Geeks"); 
  
        // Displaying the Deque 
        System.out.println("ConcurrentLinkedDeque: "
                           + cld); 
  
        // Remove all elements of the Deque using clear() 
        cld.clear(); 
  
        // Displaying message 
        System.out.println("\nConcurrentLinkedDeque cleared\n"); 
  
        // Displaying the Deque 
        System.out.println("ConcurrentLinkedDeque: "
                           + cld); 
    } 
} 

Output:

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

ConcurrentLinkedDeque cleared

ConcurrentLinkedDeque: []

Program 2:

// Java Program to Demonstrate clear() 
// method of ConcurrentLinkedDeque 
  
import java.util.concurrent.*; 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        // Creating an empty Deque 
        ConcurrentLinkedDeque<Integer> cld 
            = new ConcurrentLinkedDeque<Integer>(); 
  
        // Add elements into the Deque 
        cld.add(10); 
        cld.add(20); 
        cld.add(30); 
        cld.add(40); 
        cld.add(50); 
  
        // Displaying the Deque 
        System.out.println("ConcurrentLinkedDeque: "
                           + cld); 
  
        // Remove all elements of the Deque using clear() 
        cld.clear(); 
  
        // Displaying message 
        System.out.println("\nConcurrentLinkedDeque cleared\n"); 
  
        // Displaying the Deque 
        System.out.println("ConcurrentLinkedDeque: "
                           + cld); 
    } 
} 

Output:

ConcurrentLinkedDeque: [10, 20, 30, 40, 50]

ConcurrentLinkedDeque cleared

ConcurrentLinkedDeque: []

Reference: https://docs.oracle.com/javase/9/docs/api/java/util/concurrent/ConcurrentLinkedDeque.html#clear–

Suggest improvement

ConcurrentLinkedDeque add() method in Java

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