AbstractMap isEmpty() Method in Java with Examples

Last Updated : 26 Oct, 2018

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

// 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("Geeks", 10);         abs_map.put("4", 15);         abs_map.put("Geeks", 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, Geeks=20, You=30, Welcomes=25}  Is the map empty? false

Program 2: For an empty HashMap

Java

// 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.

AbstractMap isEmpty() Method in Java with Examples

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AbstractMap isEmpty() Method in Java with Examples

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