Map isEmpty() Method in Java with Examples (original) (raw)

Last Updated : 02 Jan, 2019

This method is used to check if a map is having any entry for key and value pairs. If no mapping exists, then this returns true.Syntax:

boolean isEmpty()

Parameters: This method has no argument.Returns: This method returns True if the map does not contain any key-value mapping. Below programs show the implementation of int isEmpty() method.Program 1:

Java `

// Java code to show the implementation of // isEmpty method in Map interface import java.util.*; public class GfG {

// Driver code
public static void main(String[] args)
{

    // Initializing a Map of type HashMap
    Map<String, String> map = new HashMap<>();

    System.out.println(map);

    System.out.println(map.isEmpty());
}

}

`

Program 2: Below is the code to show implementation of hashCode().

Java `

// Java code to show the implementation of // isEmpty method in Map interface import java.util.*; public class GfG {

// Driver code
public static void main(String[] args)
{

    // Initializing a Map of type HashMap
    Map<String, String> map = new HashMap<>();
    map.put("1", "One");
    map.put("3", "Three");
    map.put("5", "Five");
    map.put("7", "Seven");
    map.put("9", "Ninde");
    System.out.println(map);

    System.out.println(map.isEmpty());
}

}

`

Output:

{1=One, 3=Three, 5=Five, 7=Seven, 9=Ninde} false

Reference: Oracle Docs