Java 8 List<V> into Map<K, V>

To convert a List<V> into a Map<K, V> in Java 8, you can use the toMap() method of the Collectors class from the java.util.stream package.

The toMap() method takes a function that extracts the key from an element and a function that extracts the value, and returns a Collector that accumulates elements into a Map. You can then use this collector with the collect() method of the Stream interface to create the map.

Here is an example of how to convert a List<V> into a Map<K, V> in Java 8:

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

public class Main {
  public static void main(String[] args) {
    List<V> list = ...;
    Map<K, V> map = list.stream()
        .collect(Collectors.toMap(
            element -> element.getKey(),  // Function to extract the key from an element
            element -> element.getValue()  // Function to extract the value from an element
        ));
  }
}

This code creates a stream of the elements in the list using the stream() method and then collects them into a Map using the toMap() method and the collect()