LinkedTransferQueue add() method in Java
Last Updated :
14 Sep, 2018
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The add() method of java.util.concurrent.LinkedTransferQueue is an in-built function in Java which is used to insert an element in this queue.
Syntax:
Java
Java
Java
LinkedTransferQueue.add(E e)Parameters: The function accepts a single parameter e i.e. the element to be inserted. Return Value: The function returns a boolean value. Exception: The function throws NullPointerException when the specified element is Null. Below programs illustrate the use of java.util.concurrent.LinkedTransferQueue.add() : Program 1: Inserting Integers in the queue.
// Java Program Demonstrate add()
// method of LinkedTransferQueue
import java.util.concurrent.*;
class LinkedTransferQueueAddExample1 {
public static void main(String[] args)
{
// Initializing the queue
LinkedTransferQueue<Integer>
queue = new LinkedTransferQueue<Integer>();
// Adding elements to this queue
for (int i = 10; i <= 15; i++)
queue.add(i);
// Printing the elements of the queue
System.out.println("The elements in the queue are:");
for (Integer i : queue)
System.out.print(i + " ");
}
}
Output:
Program 2: Adding String in the queue.
The elements in the queue are: 10 11 12 13 14 15
// Java Program Demonstrate add()
// method of LinkedTransferQueue
import java.util.concurrent.*;
class LinkedTransferQueueAddExample2 {
public static void main(String[] args)
{
// Initializing the queue
LinkedTransferQueue<String>
queue = new LinkedTransferQueue<String>();
// Adding elements to this queue
queue.add("a");
queue.add("b");
queue.add("c");
queue.add("d");
queue.add("e");
// Printing the elements of the queue
System.out.println("The elements in the queue are:");
for (String i : queue)
System.out.print(i + " ");
}
}
Output:
Program 3: To demonstrate NullPointerException
The elements in the queue are: a b c d e
// Java Program Demonstrate add()
// method of LinkedTransferQueue
import java.util.concurrent.*;
class LinkedTransferQueueAddExample2 {
public static void main(String[] args)
{
// Initializing the queue
LinkedTransferQueue<String>
queue = new LinkedTransferQueue<String>();
try {
// Adding null to this queue
queue.add(null);
}
catch (Exception e) {
System.out.println("Exception: " + e);
}
}
}
Output:
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/LinkedTransferQueue.html#add(E)
Exception: java.lang.NullPointerException
