Get Size of Java HashMap Example

/*
  Get Size of Java HashMap Example
  This Java Example shows how to get the size or nubmer of key value pairs
  stored in HashMap using size method.
*/
 
import java.util.HashMap;
 
public class GetSizeOfHashMapExample{
 
  public static void main(String[] args) {
 
    //create HashMap object
    HashMap hMap = new HashMap();
 
    /*
      To get the size of HashMap use
      int size() method of HashMap class. It returns the number of key value
      pairs stored in HashMap object.     
    */
    System.out.println("Size of HashMap : " + hMap.size());
 
    //add key value pairs to HashMap using put method
    hMap.put("1","One");
    hMap.put("2","Two");
    hMap.put("3","Three");
    System.out.println("Size of HashMap after addition : " + hMap.size());
 
    //remove one element from HashMap using remove method
    Object obj = hMap.remove("2");
    System.out.println("Size of HashMap after removal : " + hMap.size());
  }
}
 
/*
Output would be
Size of HashMap : 0
Size of HashMap after addition : 3
Size of HashMap after removal : 2
*/