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LinkedBlockingDeque removeFirstOccurrence() method in Java

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  • Last Updated : 04 Aug, 2021

The removeFirstOccurrence() method of LinkedBlockingDeque removes the first occurrence of the specified element from this deque. If the deque does not contain the element, it remains unchanged. It returns true if this deque contained the specified element, else it returns false. 
Syntax: 
 

public boolean removeFirstOccurrence(Object o)

Parameters: This method accepts a mandatory parameter o which specifies the element to be removed from the Deque container. 
Returns: This method returns true if the element is present and removed from the Deque container, else it returns false
Below programs illustrate removeFirstOccurrence() method of LinkedBlockingDeque:
Program 1: When element is present
 

Java




// Java Program to demonstrate removeFirstOccurrence()
// method of LinkedBlockingDeque
 
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
 
public class GFG {
    public static void main(String[] args)
        throws InterruptedException
    {
 
        // create object of LinkedBlockingDeque
        LinkedBlockingDeque<Integer> LBD
            = new LinkedBlockingDeque<Integer>();
 
        // Add numbers to end of LinkedBlockingDeque
        LBD.add(15);
        LBD.add(20);
        LBD.add(20);
        LBD.add(15);
 
        // print Dequeue
        System.out.println("Linked Blocking Deque: " + LBD);
 
        if (LBD.removeFirstOccurrence(15))
            System.out.println("First occurrence of 15 removed");
        else
            System.out.println("15 not present and not removed");
 
        // prints the Deque after removal
        System.out.println("Linked Blocking Deque: " + LBD);
    }
}

Output

Linked Blocking Deque: [15, 20, 20, 15]
First occurrence of 15 removed
Linked Blocking Deque: [20, 20, 15]

Program 2: When element is not present
 

Java




// Java Program to demonstrate removeFirstOccurrence()
// method of LinkedBlockingDeque
 
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
 
public class GFG {
    public static void main(String[] args)
        throws InterruptedException
    {
 
        // create object of LinkedBlockingDeque
        LinkedBlockingDeque<Integer> LBD
            = new LinkedBlockingDeque<Integer>();
 
        // Add numbers to end of LinkedBlockingDeque
        LBD.add(15);
        LBD.add(20);
        LBD.add(20);
        LBD.add(15);
 
        // print Dequeue
        System.out.println("Linked Blocking Deque: " + LBD);
 
        if (LBD.removeFirstOccurrence(10))
            System.out.println("First occurrence of 10 removed");
        else
            System.out.println("10 not present and not removed");
 
        // prints the Deque after removal
        System.out.println("Linked Blocking Deque: " + LBD);
    }
}

Output: 

Linked Blocking Deque: [15, 20, 20, 15]
10 not present and not removed
Linked Blocking Deque: [15, 20, 20, 15]

 

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedBlockingDeque.html#removeFirstOccurrence-java.lang.Object-
 


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