HashMap : size : Get the Number Of Key-Value Pairs

public int size()

Returns the number of key-value mappings in this map.

import java.util.*;

class HashMapSize{
 public static void main(String args[]){
  HashMap<Integer, String> myMap;
  myMap = new HashMap<> ();
  
  System.out.print("Size Of myMap is ");
  System.out.println(myMap.size());
  
  /* Add Data to myMap */
  myMap.put(100, "Hi");
  myMap.put(25, "How");
  myMap.put(31, "Are");
 
  System.out.print("Size Of myMap is ");
  System.out.println(myMap.size());
 }
}

Output

Size Of myMap is 0
Size Of myMap is 3

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