What is AbstractMap isEmpty in Java?

import java.util.*;
class AbstractMapDemo {
    public static void main(String[] args)
    {
  
        // Creating an AbstractMap
        AbstractMap<String, String>
            abstractMap = new HashMap<String, String>();
        // Checking for any key-value pair in the Map
        System.out.println("Is the AbstractMap empty? "
                           + abstractMap.isEmpty());
  
        // Mapping string values to string keys
        abstractMap.put("One", "Shot");
        abstractMap.put("Of", "Java");
        abstractMap.put("Edpresso", "Yaaaayy");
    
  
        // Printing the AbstractMap
        System.out.println("The Mappings are: "
                           + abstractMap);
  
        // Checking for any key-value pair in the Map
        System.out.println("Is the AbstractMap empty? "
                           + abstractMap.isEmpty());
    }
}