一题目要求：

二具体代码：

package three;

import sun.util.resources.LocaleData;

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.*;

public class test {
    public static void main(String[] args) {
        String userStrs = "10001:张三:男:1990-01-01#10002:李四:女:1989-01-09" +
                "#10003:上五:男:1999-09-09#10004:各:男:1999-01-01" +
                "#10005:孙悟窄:男:1900-01-02#10006:张:女:1999-01-01" +
                "#10007:刘备:女:1999-01-01#10004:张sa:女:2003-07-01" +
                "#10009:气我:男:1900-01-01";
        List<People> peoples=new ArrayList<>();
        String[] user=userStrs.split("#");
        for (String s : user) {
            People m=new People();
            String[]data=s.split(":");
            m.setId(Long.valueOf(data[0]));
            m.setName(data[1]);
            m.setGender(data[2]);
            m.setBirthday(LocalDate.parse(data[3]));
            peoples.add(m);
        }
        System.out.println(peoples);
    }
}

package three;

import sun.util.resources.LocaleData;

import java.time.LocalDate;

public class People {
    private long id;
    private String name;
    private String gender;
    private LocalDate birthday;

    public People() {
    }

    public People(long id, String name, String gender, LocalDate birthday) {
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.birthday = birthday;
    }

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public String getGender() {
        return gender;
    }

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

    public LocalDate getBirthday() {
        return birthday;
    }

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

    @Override
    public String toString() {
        return "People{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", gender='" + gender + '\'' +
                ", birthday=" + birthday +
                '}';
    }
}

三：业务二：

四具体代码：(主类里面加一个方法)

   private static void count(List<People> peoples) {
        Map<String,Integer> count=new HashMap<>();
        for (People people : peoples) {
            if(count.containsKey(people.getName())){
                count.put(people.getName(), count.get(people.getName())+1);
            }else{
                count.put(people.getName(), 1);
            }
        }
        count.forEach((p,c)->{
            System.out.println(p+"出现 " +c+"次");
        });
    }

五运行结果：