hashmap.foreach example

In Java, you can use the forEach() method from the Map interface to iterate over the key-value pairs of a HashMap.

Here's an example of how you can use the forEach() method to iterate over a HashMap:

import java.util.HashMap;
import java.util.Map;

public class Main {
    public static void main(String[] args) {
        // create a hash map
        Map<String, Integer> map = new HashMap<>();

        // add key-value pairs to the map
        map.put("Apple", 1);
        map.put("Banana", 2);
        map.put("Orange", 3);

        // iterate over the map using the forEach method
        map.forEach((key, value) -> System.out.println(key + ": " + value));
    }
}

This code creates a HashMap called map and adds three key-value pairs to it: "Apple" => 1, "Banana" => 2, and "Orange" => 3. It then uses the forEach() method to iterate over the map and print the key-value pairs.

The forEach() method takes a BiConsumer as an argument, which is a functional interface that represents an operation that takes two input arguments and returns no result. In this example, the BiConsumer is defined as a lambda expression that takes two arguments: a key and a value, and prints them to the console.

For more information about HashMap and other collections in Java, you can refer to the Java documentation (https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html).