初学者，用Java解决这个问题，但是自己写除了查询之外总是会有问题，哪位能帮帮忙？最好是能给个代码

Question

某公司员工拥有若干个职员，职员信息有（工号、姓名、性别、出生年月、职称、出生地、爱好）

1.请设计如下的类

（1）社员（Staff）：需要包含上述属性信息；本身支持按照员工工号排序；属性【爱好】要求是不重复的集合结构。

（2）公司（Company）：需要包含所有的社员信息；需要支持根据工号和名字查找员工信息的方法。

2.请实现以下功能

（1）创建公司实例，并且添加10个以上的员工信息。

（2）请分别按照工号、姓名、性别、出生年月来排序员工信息，并输出。

（3）输入一个爱好，并判断本公司内是否有这个爱好的员工；若有则输出有这个爱好的员工信息。

（4）先获取公司人员的所有出生地信息，然后按出生地归类

如上海：2人 - 张三李四

     江西：1人 - 王五

Answer 1

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

public class Main {
    public static class Staff{
        public Integer staffId;
        public String name;
        public Integer gender;
        public Date birthday;
        public String position;
        public String birthplace;
        public List<String> hobbies;

        public Integer getStaffId() {
            return staffId;
        }

        public void setStaffId(Integer staffId) {
            this.staffId = staffId;
        }

        public String getName() {
            return name;
        }

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

        public Integer getGender() {
            return gender;
        }

        public void setGender(Integer gender) {
            this.gender = gender;
        }

        public Date getBirthday() {
            return birthday;
        }

        public void setBirthday(Date birthday) {
            this.birthday = birthday;
        }

        public String getPosition() {
            return position;
        }

        public void setPosition(String position) {
            this.position = position;
        }

        public String getBirthplace() {
            return birthplace;
        }

        public void setBirthplace(String birthplace) {
            this.birthplace = birthplace;
        }

        public List<String> getHobbies() {
            return hobbies;
        }

        public void setHobbies(List<String> hobbies) {
            this.hobbies = hobbies;
        }

        @Override
        public String toString() {
            return "Staff{" +
                    "staffId=" + staffId +
                    ", name='" + name + '\'' +
                    ", gender=" + gender +
                    ", birthday=" + birthday +
                    ", position='" + position + '\'' +
                    ", birthplace='" + birthplace + '\'' +
                    ", hobbies=" + hobbies +
                    '}';
        }
    }
    public static class Company{
        public List<Staff> staffs;
        // 获取
        public Staff getStaff(Integer id){
            return staffs.stream().filter(staff -> staff.staffId.equals(id)).findFirst().get();
        }
        public Staff getStaff(String name){
            return staffs.stream().filter(staff -> staff.name.equals(name)).findFirst().get();
        }
        public List<Staff> getHobbies(String hobbies){
            return staffs.stream().filter(staff -> staff.hobbies.contains(hobbies)).collect(Collectors.toList());
        }
        public void Place(){
            Map<String, List<Staff>> singleMap = staffs.stream().collect(Collectors.groupingBy(Staff::getBirthplace));
            for(String key:singleMap.keySet()){
                System.out.println("城市:"+key+" "+"人数:"+singleMap.get(key).size()+Company.getNames(singleMap.get(key)));
            }
        }
        public static String getNames(List<Staff> staffs){
            List<String> names = new ArrayList<String>();
            for(int i=0;i<staffs.size();i++){
                names.add(staffs.get(i).name);
            }
            return names.toString();
        }
    }
    public static void main(String args[]){
        Company company = new Company();
        List<Staff> staffs = new ArrayList<Staff>();
        company.staffs =staffs;
        for(int i=0;i<11;i++){
            Staff item = new Staff();
            item.staffId = i;
            item.name = "张三"+i;
            item.birthday = new Date(1980,01,01);
            item.gender = 1;
            if(i%2==0){
                item.birthplace="江苏";
                List<String> hobbies = new ArrayList<String>();
                hobbies.add("打网球");
                item.hobbies = hobbies;
            }
            else{
                item.birthplace="广东";
                List<String> hobbies = new ArrayList<String>();
                hobbies.add("游泳");
                item.hobbies = hobbies;
            }

            company.staffs.add(item);
        }
        for (int i =0;i<11;i++){
            System.out.println(staffs.get(i).toString());
        }
        System.out.println("请输入爱好:");
        Scanner scanner = new Scanner(System.in);
        String place = scanner.nextLine();
        List<Staff> list2 = company.getHobbies(place);
        for (int i =0;i<list2.size();i++){
            System.out.println(list2.get(i).toString());
        }
        company.Place();


    }
}

 结果：

"C:\Program Files\Java\jdk1.8.0_45\bin\java.exe" "-javaagent:F:\IntelliJ IDEA 2021.1\lib\idea_rt.jar=11512:F:\IntelliJ IDEA 2021.1\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_45\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\rt.jar;G:\BaiduNetdiskDownload\app\out\production\app" Main
Staff{staffId=0, name='张三0', gender=1, birthday=Sun Feb 01 00:00:00 CST 3880, position='null', birthplace='江苏', hobbies=[打网球]}
Staff{staffId=1, name='张三1', gender=1, birthday=Sun Feb 01 00:00:00 CST 3880, position='null', birthplace='广东', hobbies=[游泳]}
Staff{staffId=2, name='张三2', gender=1, birthday=Sun Feb 01 00:00:00 CST 3880, position='null', birthplace='江苏', hobbies=[打网球]}
Staff{staffId=3, name='张三3', gender=1, birthday=Sun Feb 01 00:00:00 CST 3880, position='null', birthplace='广东', hobbies=[游泳]}
Staff{staffId=4, name='张三4', gender=1, birthday=Sun Feb 01 00:00:00 CST 3880, position='null', birthplace='江苏', hobbies=[打网球]}
Staff{staffId=5, name='张三5', gender=1, birthday=Sun Feb 01 00:00:00 CST 3880, position='null', birthplace='广东', hobbies=[游泳]}
Staff{staffId=6, name='张三6', gender=1, birthday=Sun Feb 01 00:00:00 CST 3880, position='null', birthplace='江苏', hobbies=[打网球]}
Staff{staffId=7, name='张三7', gender=1, birthday=Sun Feb 01 00:00:00 CST 3880, position='null', birthplace='广东', hobbies=[游泳]}
Staff{staffId=8, name='张三8', gender=1, birthday=Sun Feb 01 00:00:00 CST 3880, position='null', birthplace='江苏', hobbies=[打网球]}
Staff{staffId=9, name='张三9', gender=1, birthday=Sun Feb 01 00:00:00 CST 3880, position='null', birthplace='广东', hobbies=[游泳]}
Staff{staffId=10, name='张三10', gender=1, birthday=Sun Feb 01 00:00:00 CST 3880, position='null', birthplace='江苏', hobbies=[打网球]}
请输入爱好:
游泳
Staff{staffId=1, name='张三1', gender=1, birthday=Sun Feb 01 00:00:00 CST 3880, position='null', birthplace='广东', hobbies=[游泳]}
Staff{staffId=3, name='张三3', gender=1, birthday=Sun Feb 01 00:00:00 CST 3880, position='null', birthplace='广东', hobbies=[游泳]}
Staff{staffId=5, name='张三5', gender=1, birthday=Sun Feb 01 00:00:00 CST 3880, position='null', birthplace='广东', hobbies=[游泳]}
Staff{staffId=7, name='张三7', gender=1, birthday=Sun Feb 01 00:00:00 CST 3880, position='null', birthplace='广东', hobbies=[游泳]}
Staff{staffId=9, name='张三9', gender=1, birthday=Sun Feb 01 00:00:00 CST 3880, position='null', birthplace='广东', hobbies=[游泳]}
城市:广东 人数:5[张三1, 张三3, 张三5, 张三7, 张三9]
城市:江苏 人数:6[张三0, 张三2, 张三4, 张三6, 张三8, 张三10]

Process finished with exit code 0