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AbstractMap isEmpty() Method in Java with Examples

Last Updated : 26 Oct, 2018
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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.

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