Java Stream GroupBy

package com.tistory.ddoriya.stream;
 
import com.tistory.ddoriya.stream.model.User;
 
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
 
public class TestSteam2 {
 
    public static void main(String[] args) {
 
        List<User> userList = Arrays.asList(
                new User("1", "AAA", "11", "123@mail"),
                new User("2", "BBB", "11", "123@mail"),
                new User("3", "BBB", "11", "123@mail"),
                new User("4", "BBB", "11", "123@mail"),
                new User("5", "BBB", "11", "123@mail"),
                new User("6", "CCC", "11", "123@mail"),
                new User("7", "CCC", "11", "123@mail"),
                new User("8", "CCC", "11", "123@mail"),
                new User("9", "CCC", "11", "123@mail"),
                new User("10", "CCC", "11", "123@mail")
        );
 
        List<String> stringList = new ArrayList<>();
 
 
        Map<String, Long> test = userList.stream().collect(
                Collectors.groupingBy(User::getName, Collectors.counting())
        );
 
        System.out.println(test.get("AA"));
        System.out.println(test);
 
        Map<String, List<User>> test1 = userList.stream().collect(
                Collectors.groupingBy(User::getName)
        );
 
        System.out.println(test1.get("AAA").size());
        System.out.println(test1.get("BBB").size());
        System.out.println(test1.get("CCC").size());
 
        System.out.println(test1.get("AAA").get(0));
        System.out.println(test1);
 
        for (User user : userList) {
//            System.out.println(user.toString());
        }
 
    }
}