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
