基于单列数据对ArrayList()进行集群的更简洁的方法是什么？

import java.util.*;
import java.util.stream.Collectors;

class MyClass {
    private int id;
    private String name;

    // 构造函数、getter和setter省略

    public MyClass(int id, String name) {
        this.id = id;
        this.name = name;
    }

    public int getId() {
        return id;
    }
}

public class Main {
    public static void main(String[] args) {
        List<MyClass> list = Arrays.asList(
            new MyClass(1, "Alice"),
            new MyClass(2, "Bob"),
            new MyClass(1, "Charlie"),
            new MyClass(3, "David")
        );

        // 基于id属性进行分组
        Map<Integer, List<MyClass>> groupedById = list.stream()
            .collect(Collectors.groupingBy(MyClass::getId));

        // 输出结果
        groupedById.forEach((id, group) -> {
            System.out.println("ID: " + id);
            group.forEach(obj -> System.out.println("  " + obj.getName()));
        });
    }
}