Java LinkedTransferQueue add() method

The add() method of LinkedTransferQueue class is used to insert the specified element at the tail of the LinkedTransferQueue. The add() method overrides add in class AbstractQueue<E>.

Syntax:

Parameters:

e - It is the element to add

Specified By:

The add() method of LinkedTransferQueue class is specified by :

add in interface Collection<E>
add in interface BlockingQueue<E>
add in interface Queue<E>

Return:

This method returns the Boolean value true.

Throws:

NullPointerException: This method will throw if the specified element is null.

Example 1

import java.util.concurrent.LinkedTransferQueue;

public class LinkedTransferQueueAddExample1 {

public static void main(String[] args) {
int j =1;
LinkedTransferQueue<Integer> queue = new LinkedTransferQueue<Integer>();
for (int i = 1; i <=5; i++) {
//  Adding items to the tail of this queue
queue.add(i);
System.out.println("After adding "+ j++ +" to the queue :");
System.out.println(queue);
        }
    }
}

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Output:

After adding 1 to the queue :
[1]
After adding 2 to the queue :
[1, 2]
After adding 3 to the queue :
[1, 2, 3]
After adding 4 to the queue :
[1, 2, 3, 4]
After adding 5 to the queue :
[1, 2, 3, 4, 5]

Example 2

import java.util.Collections;
import java.util.concurrent.LinkedTransferQueue;

public class LinkedTransferQueueAddExample2 {
public static void main(String[] args) {
        Integer[] val = {0, 1};
        LinkedTransferQueue<Integer> queue = new LinkedTransferQueue<Integer>();
        queue.add(718);
        queue.add(8);
        queue.add(18);
        queue.add(119);
        System.out.println("Queue : ");
        for (Integer n : queue) {
        	System.out.println(n);
        	val[0] = Collections.max(queue);
        	val[1] = Collections.min(queue);
        }
        System.out.println("Max number = "+ val[0]);
        System.out.println("Min number = "+ val[1]);
    }
}

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Output:

Queue : 
718
8
18
119
Max number = 718
Min number = 8

Example 3

import java.util.concurrent.LinkedTransferQueue;
class Name{
private String name;

public Name(String name) {
this.name = name;
    }
public String toString(){
return "Name = "+ this.name;
    }
}
public class LinkedTransferQueueAddExample3 {
public static int i=1;
public static void main(String[] args) {
	LinkedTransferQueue<Name> queue = new LinkedTransferQueue<Name>();
        Name s1 = new Name("Jack");
        Name s2 = new Name("Johnny");
        Name s3 = new Name("Angelina");
        Name s4 = new Name("Russell");
queue.add(s1);
queue.add(s2);
queue.add(s3);
queue.add(s4);
for (Name xyz : queue){
System.out.println(i++ + ". "+xyz);
        }
    }
}

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Output:

1. Name = Jack
2. Name = Johnny
3. Name = Angelina
4. Name = Russell

Example 4

import java.util.concurrent.LinkedTransferQueue;
public class LinkedTransferQueueAddExample4 {
public static void main(String[] args) {
LinkedTransferQueue<Integer> queue = new LinkedTransferQueue<Integer>();
queue.add(null);
queue.add(90);
queue.add(187);
    }
}

Test it Now

Output:

Exception in thread "main" java.lang.NullPointerException
	at java.base/java.util.concurrent.LinkedTransferQueue.xfer(Unknown Source)
	at java.base/java.util.concurrent.LinkedTransferQueue.add(Unknown Source)
	at tests.LinkedTransferQueueAddExample4.main(LinkedTransferQueueAddExample4.java:5)

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