BlockingDeque contains() method in Java with Examples

Last Updated : 01 Oct, 2019

The contains(Object o) method of BlockingDeque checks if the passed element in the parameter exists in the container or not. It returns true if the element exists in the container else it returns a false value.

Syntax:

public boolean contains(Object o)

Parameters: This method accepts a mandatory parameter o whose presence in the container is to be checked in the container.

Returns: This method returns true if the element is present, else it returns false.

Note: The contains() method of BlockingDeque has been inherited from the LinkedBlockingDeque class in Java.

Below programs illustrate contains() method of BlockingDeque:

Program 1:

// Java Program Demonstrate contains()
// method of BlockingDeque
  
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws IllegalStateException
    {
  
        // create object of BlockingDeque
        BlockingDeque<Integer> BD
            = new LinkedBlockingDeque<Integer>();
  
        // Add numbers to end of BlockingDeque
        BD.add(10);
        BD.add(20);
        BD.add(30);
        BD.add(40);
  
        // before removing print Deque
        System.out.println("Blocking Deque: " + BD);
  
        // check for presence using function
        if (BD.contains(10)) {
            System.out.println("Blocking Deque contains 10");
        }
        else {
            System.out.println("Blocking Deque does not contain 10");
        }
    }
}

Output:

Blocking Deque: [10, 20, 30, 40]
Blocking Deque contains 10

Program 2:

// Java Program Demonstrate contains()
// method of BlockingDeque
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws IllegalStateException
    {
  
        // create object of BlockingDeque
        BlockingDeque<String> BD
            = new LinkedBlockingDeque<String>();
  
        // Add numbers to end of BlockingDeque
        BD.add("ab");
        BD.add("cd");
        BD.add("fg");
        BD.add("xz");
  
        // before removing print Deque
        System.out.println("Blocking Deque: " + BD);
  
        // check for presence using function
        if (BD.contains("go")) {
            System.out.println("Blocking Deque contains 'go'");
        }
        else {
            System.out.println("Blocking Deque does not contain 'go'");
        }
    }
}

Output:

Blocking Deque: [ab, cd, fg, xz]
Blocking Deque does not contain 'go'

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/LinkedBlockingDeque.html#contains(java.lang.Object)

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