Example
Verify if a map contains no key-value mappings.
import java.util.HashMap;
public class Main {
public static void main(String[] args) {
HashMap<String, String> capitalCities = new HashMap<String, String>();
System.out.println(capitalCities.isEmpty());
capitalCities.put("England", "London");
capitalCities.put("Germany", "Berlin");
capitalCities.put("Norway", "Oslo");
capitalCities.put("USA", "Washington DC");
System.out.println(capitalCities.isEmpty());
}
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Definition and Usage
The isEmpty() method returns true if the map contains no entries, and false otherwise.
Syntax
Technical Details
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Returns:
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It returns true if the map has no entries, and false otherwise.
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