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–
