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The java.util.concurrent.ConcurrentSkipListSet.size() method is an in-built function in Java which gives the total count of the elements present in the set. Syntax:

ConcurrentSkipListSet.size()

Parameters: The function does not accept any parameter. Return Value: The function returns the number of elements in the queue. Below programs illustrate the ConcurrentSkipListSet.size() method: Program 1:

Java

// Java Program Demonstrate size()
// method of ConcurrentSkipListSet

import java.util.concurrent.ConcurrentSkipListSet;

class ConcurrentSkipListSetSizeExample1 {
    public static void main(String[] args)
    {
        // Initializing the set
        ConcurrentSkipListSet<Integer> set = 
                       new ConcurrentSkipListSet<Integer>();

        // Adding elements to this set
        for (int i = 1; i <= 10; i++)
            set.add(i);

        // Printing the size of the set
        System.out.println("Number of elements in the set = "
                           + set.size());
        // Printing the elements
        System.out.println("set : " + set);
    }
}

Output:

Number of elements in the set = 10
set : [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Program 2:

Java

// Java Program Demonstrate size()
// method of ConcurrentSkipListSet

import java.util.concurrent.ConcurrentSkipListSet;

class ConcurrentSkipListSetSizeExample2 {
    public static void main(String[] args)
    {
        // Initializing the set
        ConcurrentSkipListSet<String> set = 
                         new ConcurrentSkipListSet<String>();

        // Adding elements to this set
        set.add("A");
        set.add("B");
        set.add("C");
        set.add("D");
        set.add("E");

        // Printing the size of the set
        System.out.println("Number of elements in the set = "
                           + set.size());
        // Printing the elements
        System.out.println("set : " + set);
    }
}

Output:

Number of elements in the set = 5
set : [A, B, C, D, E]

Reference:https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#size--

ConcurrentSkipListSet size() method in Java

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