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.
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