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–
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