我一直在尝试不同的排序方法，我尝试的方法中有一种没有给出我所期望的结果。
我从代码中注解掉的lamda排序中得到预期的输出

employees.sort(Comparator.comparing(Employee::getName).thenComparing(Employee::getAge));

Jack 40
John 29
John 30
Snow 22
Tim 21

但是从

employees.stream().sorted(Comparator.comparing(Employee::getName).thenComparing(Employee::getAge));

我得到了不正确的输出

John 30
John 29
Tim 21
Jack 40
Snow 22

我哪里犯的错？

package com;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;

public class Main {

    public static void main(String[] args) {
        Employee john = new Employee("John", 30);
        Employee john2 = new Employee("John", 29);
        Employee tim = new Employee("Tim", 21);
        Employee jack = new Employee("Jack", 40);
        Employee snow = new Employee("Snow", 22);

        List<Employee> employees = new ArrayList<>();
        employees.add(john);
        employees.add(john2);
        employees.add(tim);
        employees.add(jack);
        employees.add(snow);

        employees.stream().sorted(Comparator.comparing(Employee::getName).thenComparing(Employee::getAge)); //does not sort original list

        //employees.sort(Comparator.comparing(Employee::getName).thenComparing(Employee::getAge)); //sorts original list

        for(Employee employee : employees){
            System.out.println(employee.getName() + " " + employee.getAge());
        }
    }
}

class Employee{
    private String name;
    private int age;

    public Employee(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setAge(int age) {
        this.age = age;
    }
}