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ConcurrentLinkedDeque offer() method in Java with Examples

 3 years ago
source link: https://www.geeksforgeeks.org/concurrentlinkeddeque-offer-method-in-java-with-examples/
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ConcurrentLinkedDeque offer() method in Java with Examples
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ConcurrentLinkedDeque offer() method in Java with Examples
  • Last Updated : 19 Dec, 2018

The java.util.concurrent.ConcurrentLinkedDeque.offer() method is an inbuilt method in Java which inserts the specified element, passed as a parameter, to the deque.

Syntax:

public boolean offer(E elem)

Parameters: The method accepts a parameter elem which species the element to be inserted to the deque.

Return Value: The function returns True if the element is successfully added into the deque and returns False otherwise.

Exception: The function throws a NullPointerException if the passed parameter is NULL.

Below programs illustrate the ConcurrentLinkedDeque.offer() method:

Program 1:

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// Java Program to Demonstrate offer()
// 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);
// Insert an element using offer()
if (cld.offer("GFG")) {
// Displaying message
System.out.println("Element Inserted");
}
else {
// Displaying message
System.out.println("Element not Inserted");
}
// Displaying the Deque
System.out.println("ConcurrentLinkedDeque: "
+ cld);
}
}
Output: 
ConcurrentLinkedDeque: [Welcome, To, Geeks, 4, Geeks]
Element Inserted
ConcurrentLinkedDeque: [Welcome, To, Geeks, 4, Geeks, GFG]

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// Java Program to Demonstrate offer()
// 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);
try {
// Insert null element using offer()
cld.offer(null);
}
catch (Exception e) {
System.out.println(e);
}
}
}
Output: 
ConcurrentLinkedDeque: [Welcome, To, Geeks, 4, Geeks]
java.lang.NullPointerException

Reference: https://docs.oracle.com/javase/9/docs/api/java/util/concurrent/ConcurrentLinkedDeque.html#offer-E-

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