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Java HashMap isEmpty() Method |

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Java HashMap isEmpty() Method

Java HashMap

The isEmpty() method is used to check whether this HashMap is empty.

The syntax of isEmpty() is:

hashmap.isEmpty()

Note: hashmap is an object of the HashMap class.

Parameter Description:

• None

Return Value

Returns true if the HashMap contains no key-value mappings, otherwise returns false.

Example

The following example demonstrates the usage of isEmpty():

Example

import java.util.HashMap;

class Main {

public static void main(String[] args){

 HashMap<Integer, String> sites = new HashMap<>();

// Check if the HashMap has any elements

boolean result = sites.isEmpty();// true

System.out.println("Is empty? "+ result);

// Add some elements to the HashMap

 sites.put(1, "Google");

 sites.put(2, "");

 sites.put(3, "Taobao");

System.out.println("HashMap: "+ sites);

 result = sites.isEmpty();// false

System.out.println("Is empty? "+ result);

}

}

Executing the above program produces the following output:

Is empty? trueHashMap: {1=Google, 2=, 3=Taobao}Is empty? false

In the above example, we created a HashMap named sites and used the isEmpty() method to check if it is empty.

Java HashMap