ConcurrentSkipListMap size() method in Java with Examples

The size() method of java.util.concurrent.ConcurrentSkipListMap is an in-built function in Java which that is it returns the number of keys mapped to this map. The size() method is not a constant time operation. In case the map contains more than Integer.MAX_VALUE elements, the maximum value of the map is returned.

Syntax:

public int size()

Parameter: The function does not accepts any parameters.

Return Value: The function returns the number of elements in this map.

Below programs illustrate the above method:

Program 1:

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

import java.util.concurrent.*;

class GFG {
    public static void main(String[] args)
    {

        // Initializing the map
        ConcurrentSkipListMap<Integer, Integer>
            mpp = new ConcurrentSkipListMap<Integer,
                                            Integer>();

        // Adding elements to this map
        for (int i = 1; i <= 5; i++)
            mpp.put(i, i);

        // print size of map
        System.out.println(mpp.size());
    }
}

Output:

5

Program 2:

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

import java.util.concurrent.*;

class GFG {
    public static void main(String[] args)
    {

        // Initializing the map
        ConcurrentSkipListMap<Integer, Integer>
            mpp = new ConcurrentSkipListMap<Integer,
                                            Integer>();

        // Adding elements to this map
        for (int i = 1; i <= 15; i++)
            mpp.put(i, i);

        // print size of map
        System.out.println(mpp.size());
    }
}

Output:

15

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