Java HashMap forEach() Method
Example
Use the forEach()
method to print every entry in the map:
import java.util.HashMap;
public class Main {
public static void main(String[] args) {
HashMap<String, String> capitalCities = new HashMap<String, String>();
capitalCities.put("England", "London");
capitalCities.put("Germany", "Berlin");
capitalCities.put("Norway", "Oslo");
capitalCities.put("USA", "Washington DC");
capitalCities.forEach( (k, v) -> { System.out.println(k + " -> " + v); } );
}
}
Definition and Usage
The forEach()
method performs an action on every entry in the map. The action can be defined by a lambda expression that is compatible with the accept()
method of Java's BiConsumer
interface.
To learn about lambda expressions, see our Java Lambda Expression tutorial.
Syntax
public void forEach(BiConsumer action)
Parameter Values
Parameter | Description |
---|---|
action |
Required. A BiConsumer object or lambda expression which performs an action on an entry.The first parameter contains the key of an entry and the second parameter contains its value. |
Related Pages
❮ HashMap Methods