private String name; private int age; private BigDecimal salary; private Date hireDate; public EmployeeString name int age BigDecimal salary Date hireDate thisn

这段代码已经相对简化了，但仍然可以进一步精简。以下是精简后的代码：

import java.math.BigDecimal;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class Employee {

    private String name;
    private int age;
    private BigDecimal salary;
    private Date hireDate;

    public Employee(String name, int age, BigDecimal salary, Date hireDate) {
        this.name = name;
        this.age = age;
        this.salary = salary;
        this.hireDate = hireDate;
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

    public BigDecimal getSalary() {
        return salary;
    }

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

    public Date getHireDate() {
        return hireDate;
    }

    public void setHireDate(Date hireDate) {
        this.hireDate = hireDate;
    }

    public static void main(String[] args) throws ParseException {
        String data = "name=小红&age=17&salary=8000.00&hireDate=1991-07-03;" +
                "name=小明&age=23&salary=10000.00&hireDate=1992-12-11;" +
                "name=小白&age=18&salary=12000.00&hireDate=1996-01-09";

        String[] employeesData = data.split(";");

        List<Employee> employees = new ArrayList<>();

        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");

        for (String employeeData : employeesData) {
            String[] attributes = employeeData.split("&");

            String name = attributes[0].split("=")[1];
            int age = Integer.parseInt(attributes[1].split("=")[1]);
            BigDecimal salary = new BigDecimal(attributes[2].split("=")[1]);
            Date hireDate = dateFormat.parse(attributes[3].split("=")[1]);
            employees.add(new Employee(name, age, salary, hireDate));
        }

        BigDecimal totalSalary = BigDecimal.ZERO;
        for (Employee employee : employees) {
            if (employee.getHireDate().before(dateFormat.parse("1996-01-01"))) {
                totalSalary = totalSalary.add(employee.getSalary());
            }
        }

        BigDecimal averageSalary = totalSalary.divide(BigDecimal.valueOf(employees.size()), 2, BigDecimal.ROUND_HALF_UP);
        System.out.println("1996 年前入职的员工的平均薪资为: " + averageSalary);
    }
}

在精简后的代码中，主要的变化包括：

1. 移除了不必要的计数变量 count，使用 employees.size() 获取员工数量。
2. 在循环中直接解析日期字符串并创建 Date 对象，不再需要额外的 try-catch 块。
3. 在计算平均薪资时，直接使用 employees.size() 作为总员工数，避免了额外的循环来计算数量