用java实现以下代码： 定义Staff类(职工)，添加如下属性(name, address, age, sex, salary, dateHired)，类型自定，其中salary为工资，dateHired为雇佣日期(java.util.Date类型)。生成相应的setter/getter方法。编写NameComparator，AgeComparator和ComplexComparator比较器。其中ComplexComparator为复合比较器，选用工资和雇佣日期进行升序排序。比较器中需要使用Lambda表达式来完成

以下是用Java实现的代码：

import java.util.*;

public class Staff {
    private String name;
    private String address;
    private int age;
    private String sex;
    private double salary;
    private Date dateHired;

    public Staff(String name, String address, int age, String sex, double salary, Date dateHired) {
        this.name = name;
        this.address = address;
        this.age = age;
        this.sex = sex;
        this.salary = salary;
        this.dateHired = dateHired;
    }

    public String getName() {
        return name;
    }

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

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public int getAge() {
        return age;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public double getSalary() {
        return salary;
    }

    public void setSalary(double salary) {
        this.salary = salary;
    }

    public Date getDateHired() {
        return dateHired;
    }

    public void setDateHired(Date dateHired) {
        this.dateHired = dateHired;
    }
}

class NameComparator implements Comparator<Staff> {
    public int compare(Staff a, Staff b) {
        return a.getName().compareTo(b.getName());
    }
}

class AgeComparator implements Comparator<Staff> {
    public int compare(Staff a, Staff b) {
        return a.getAge() - b.getAge();
    }
}

class ComplexComparator implements Comparator<Staff> {
    public int compare(Staff a, Staff b) {
        if (a.getSalary() != b.getSalary()) {
            return Double.compare(a.getSalary(), b.getSalary());
        } else {
            return a.getDateHired().compareTo(b.getDateHired());
        }
    }
}

class Main {
    public static void main(String[] args) {
        List<Staff> staffList = new ArrayList<>();
        staffList.add(new Staff("Alice", "123 Main St", 25, "F", 50000, new Date(2021, 1, 1)));
        staffList.add(new Staff("Bob", "456 Second St", 30, "M", 60000, new Date(2020, 1, 1)));
        staffList.add(new Staff("Charlie", "789 Third St", 35, "M", 70000, new Date(2019, 1, 1)));

        // Sort by name using NameComparator
        Collections.sort(staffList, new NameComparator());
        System.out.println("Sorted by name:");
        for (Staff staff : staffList) {
            System.out.println(staff.getName());
        }

        // Sort by age using AgeComparator
        Collections.sort(staffList, new AgeComparator());
        System.out.println("Sorted by age:");
        for (Staff staff : staffList) {
            System.out.println(staff.getAge());
        }

        // Sort by salary and date hired using ComplexComparator
        Collections.sort(staffList, new ComplexComparator());
        System.out.println("Sorted by salary and date hired:");
        for (Staff staff : staffList) {
            System.out.println(staff.getSalary() + ", " + staff.getDateHired());
        }
    }
}