ConcurrentLinkedDeque contains() method in Java with Examples

The java.util.concurrent.ConcurrentLinkedDeque.contains() method is an inbuilt method in Java which checks if the specified element, passed as a parameter, is present in the deque or not.

Syntax:

public boolean contains(Object elem)

Parameters: The method accepts a parameter elem which checks if the specified element is present in the deque or not.

Return Value: The function returns True if the element is present in the deque and returns False otherwise.

Below programs illustrate the ConcurrentLinkedDeque.contains() method:

Program 1:

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// Java Program to Demonstrate contains()
// 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);
  
        // Check if GFG is present using contains()
        if (cld.contains("GFG")) {
  
            // Displaying message
            System.out.println("GFG is present");
        }
        else {
  
            // Displaying message
            System.out.println("GFG is not present");
        }
    }
}

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Output:

ConcurrentLinkedDeque: [Welcome, To, Geeks, 4, Geeks]
GFG is not present

Program 2:

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// Java Program to Demonstrate contains()
// 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);
  
        // Check if Geeks is present using contains()
        if (cld.contains("Geeks")) {
  
            // Displaying message
            System.out.println("Geeks is present");
        }
        else {
  
            // Displaying message
            System.out.println("Geeks not present");
        }
    }
}

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Output:

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

Reference: https://docs.oracle.com/javase/9/docs/api/java/util/concurrent/ConcurrentLinkedDeque.html#contains-java.lang.Object-



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