ConcurrentLinkedDeque contains() method in Java with Examples
Last Updated :
11 Jul, 2025
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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:
Java
Java
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:
// 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");
}
}
}
// Java Program to Demonstrate contains()// method of ConcurrentLinkedDequeimport 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"); } }}
Output:
Program 2:
ConcurrentLinkedDeque: [Welcome, To, Geeks, 4, Geeks] GFG is not present
// 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");
}
}
}
// Java Program to Demonstrate contains()// method of ConcurrentLinkedDequeimport 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"); } }}
Output:
Reference: https://docs.oracle.com/javase/9/docs/api/java/util/concurrent/ConcurrentLinkedDeque.html#contains-java.lang.Object-
ConcurrentLinkedDeque: [Welcome, To, Geeks, 4, Geeks] Geeks is present
