Java LinkedTransferQueue size() method

The size() method of LinkedTransferQueue class returns the returns the total count of the elements present in the queue.

Syntax:

Specified By:

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

size in interface Collection
size in class AbstractCollection

Return:

This method returns the number of elements in this queue.

Example 1

import java.util.concurrent.LinkedTransferQueue;  
public class LinkedTransferQueueSizeExample1 {  
    public static void main(String[] args) {  
    	LinkedTransferQueue<Integer> queue = new LinkedTransferQueue<Integer>();  
        queue.offer(34);  
        queue.offer(22);  
        queue.offer(26);  
        queue.offer(215);  
        //will return the total size of queue  
        int a= queue.size();  
        System.out.println("The size of queue : "+a);  
        System.out.println("Queue : "+queue);  
    }  
}

Test it Now

Output:

The size of queue : 4
Queue : [34, 22, 26, 215]

Example 2

import java.util.*;  
import java.util.concurrent.LinkedTransferQueue;  
class Patients{  
    String Pname;  
    public Patients(String pname) {  
        Pname = pname;  
    }  
    public String toString(){  
        return this.Pname;  
    }  
}  
public class LinkedTransferQueueSizeExample2 {  
    static int i=1;  
    public static void main(String[] args) {  
    Patients patient1 = new Patients("John");  
    Patients patient2 = new Patients("Harry");  
    Patients patient3 = new Patients("Peter");  
    Patients patient4 = new Patients("Marry");  
    Patients patient5 = new Patients("Jack");  
    Patients patient6 = new Patients("Lucene");  
    LinkedTransferQueue<Patients> queue = new LinkedTransferQueue<Patients>();  
        List<Patients> list = new ArrayList<Patients>();  
        queue.add(patient1);  
        queue.add(patient2);  
        queue.add(patient3);  
        queue.add(patient4);  
        queue.add(patient5);  
        queue.add(patient6);  
        // returns the total size of the queue  
        System.out.println("Total Patients = "+queue.size());  
        for(Patients xyz : queue){  
            System.out.println(i++ +"."+xyz);  
        }  
        list.add(patient1);  
        list.add(patient2);  
        list.add(patient3);  
        list.add(patient4);  
        i=1;  
        System.out.println("Patients recovered and discharged : "+list);  
        queue.removeAll(list);  
        System.out.println("Patients left in the hospital = "+queue.size());  
        for (Patients xyz : queue) {  
            System.out.println(i++ +"."+xyz);  
        }  
    }  
} 

Test it Now

Output:

Total Patients = 6
1.John
2.Harry
3.Peter
4.Marry
5.Jack
6.Lucene
Patients recovered and discharged : [John, Harry, Peter, Marry]
Patients left in the hospital = 2
1.Jack
2.Lucene

Example 3

import java.util.concurrent.LinkedTransferQueue;  
public class LinkedTransferQueueSizeExample3 {  
    public static void main(String[] args) {  
    	LinkedTransferQueue<Integer> queue = new LinkedTransferQueue<Integer>();  
        queue.add(null);  
        queue.add(null);  
        int val =queue.size();  
        System.out.println("Size of queue = "+val);  
    }  
}  

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.LinkedTransferQueueSizeExample3.main(LinkedTransferQueueSizeExample3.java:5)

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