从Double列表返回List[Double]，Map[String，Double]

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

public class Main {
    public static void main(String[] args) {
        List<Double> doubleList = Arrays.asList(1.0, 2.0, 3.0, 4.0, 5.0);
        List<Double> newList = doubleList.stream()
                .collect(Collectors.toList());
        System.out.println(newList);
    }
}

val doubleList = List(1.0, 2.0, 3.0, 4.0, 5.0)
val newList = doubleList.map(identity)
println(newList)

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

public class Main {
    public static void main(String[] args) {
        Map<String, Double> map = new HashMap<>();
        map.put("key1", 1.0);
        map.put("key2", 2.0);
        map.put("key3", 3.0);
        System.out.println(map);
    }
}

val map = Map("key1" -> 1.0, "key2" -> 2.0, "key3" -> 3.0)
println(map)