AbstractMap isEmpty() Method in Java with Examples
The AbstractMap.isEmpty() method of AbstractMap class is used to check for the emptiness of the map. The method returns True if no key-value pair or mapping is present in the map else False.
Syntax:
AbstractMap.isEmpty()
Parameters: The method does not take any parameters.
Return Value: The method returns boolean true if the map is empty or does not contain any mapping pairs else boolean false.
Below programs illustrates the working of AbstractMap.isEmpty() method:
Program 1: Mapping String Values to Integer Keys.
// Java code to illustrate the isEmpty() method import java.util.*; public class AbstractMap_Demo { public static void main(String[] args) { // Creating an empty AbstractMap AbstractMap<String, Integer> abs_map = new HashMap<String, Integer>(); // Mapping int values to string keys abs_map.put("Beginner", 10); abs_map.put("4", 15); abs_map.put("Beginner", 20); abs_map.put("Welcomes", 25); abs_map.put("You", 30); // Displaying the AbstractMap System.out.println("The Mappings are: " + abs_map); // Checking for the emptiness of Map System.out.println("Is the map empty? " + abs_map.isEmpty()); } } |
Output:
The Mappings are: {4=15, Beginner=20, You=30, Welcomes=25}
Is the map empty? false
Program 2: For an empty HashMap
// Java code to illustrate the isEmpty() method import java.util.*; public class Abstract_Map_Demo { public static void main(String[] args) { // Creating an empty AbstractMap AbstractMap<String, Integer> abs_map = new HashMap<String, Integer>(); // Displaying the AbstractMap System.out.println("The Mappings are: " + abs_map); // Checking for the emptiness of Map System.out.println("Is the map empty? " + abs_map.isEmpty()); } } |
Output:
The Mappings are: {}
Is the map empty? true
Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.
Contact Us