BlockingDeque removeFirstOccurrence() method in Java with Examples
Last Updated :
19 Jul, 2021
The removeFirstOccurrence() method of BlockingDeque 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.
Note: The removeFirstOccurrence() method of BlockingDeque has been inherited from the LinkedBlockingDeque class in Java.
Below programs illustrate removeFirstOccurrence() method of BlockingDeque:
Program 1: When element is present
Java
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws InterruptedException
{
BlockingDeque<Integer> BD
= new LinkedBlockingDeque<Integer>();
BD.add( 15 );
BD.add( 20 );
BD.add( 20 );
BD.add( 15 );
System.out.println( "Blocking Deque: " + BD);
if (BD.removeFirstOccurrence( 15 ))
System.out.println( "First occurrence of 15 removed" );
else
System.out.println( "15 not present and not removed" );
System.out.println( "Blocking Deque: " + BD);
}
}
|
Output
Blocking Deque: [15, 20, 20, 15]
First occurrence of 15 removed
Blocking Deque: [20, 20, 15]
Program 2: When element is not present
Java
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws InterruptedException
{
BlockingDeque<Integer> BD
= new LinkedBlockingDeque<Integer>();
BD.add( 15 );
BD.add( 20 );
BD.add( 20 );
BD.add( 15 );
System.out.println( "Blocking Deque: " + BD);
if (BD.removeFirstOccurrence( 10 ))
System.out.println( "First occurrence of 10 removed" );
else
System.out.println( "10 not present and not removed" );
System.out.println( "Blocking Deque: " + BD);
}
}
|
Output:
Blocking Deque: [15, 20, 20, 15]
10 not present and not removed
Blocking Deque: [15, 20, 20, 15]
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#removeFirstOccurrence(java.lang.Object)
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