HashSet思考题

Set接口实现类——HashSet

定义一个Employee类，该类包含：private成员属性name,sal,birthday(MyDate类型)，其中birthday为MyDate类型（属性包括：year,month,day），要求：

1. 创建3个Employee放入HashSet中
2. 当name和birthday的值相同时，认为是相同员工，不能添加到HashSet集合中

import java.util.HashSet;
import java.util.Objects;

public class HashSetExercise {
    public static void main(String[] args) {
        //创建一个HashSet
        HashSet hashSet = new HashSet();

        //添加数据
        hashSet.add(new Employee("test1",10000,new MyDate(2001,1,1)));
        hashSet.add(new Employee("test2",20000,new MyDate(2002,2,2)));
        hashSet.add(new Employee("test1",10000,new MyDate(2001,1,1)));

        System.out.println("hashSet = " + hashSet);
    }
}

//定义Employee
class Employee{
    private String name;
    private double sal;
    private MyDate birthday;

    public Employee(String name, double sal, MyDate birthday) {
        this.name = name;
        this.sal = sal;
        this.birthday = birthday;
    }

    public String getName() {
        return name;
    }

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

    public double getSal() {
        return sal;
    }

    public void setSal(double sal) {
        this.sal = sal;
    }

    public MyDate getBirthday() {
        return birthday;
    }

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

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Employee employee = (Employee) o;
        return Objects.equals(name, employee.name) &&
                Objects.equals(birthday, employee.birthday);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, birthday);
    }

    @Override
    public String toString() {
        return "Employee{" +
                "name='" + name + '\'' +
                ", sal=" + sal +
                ", birthday=" + birthday +
                '}';
    }
}

//定义MyDate类
class MyDate{
    private int year;
    private int month;
    private int day;

    public MyDate(int year, int month, int day) {
        this.year = year;
        this.month = month;
        this.day = day;
    }

    public int getYear() {
        return year;
    }

    public void setYear(int year) {
        this.year = year;
    }

    public int getMonth() {
        return month;
    }

    public void setMonth(int month) {
        this.month = month;
    }

    public int getDay() {
        return day;
    }

    public void setDay(int day) {
        this.day = day;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        MyDate myDate = (MyDate) o;
        return year == myDate.year &&
                month == myDate.month &&
                day == myDate.day;
    }

    @Override
    public int hashCode() {
        return Objects.hash(year, month, day);
    }
}