用Java编写人事管理系统代码要求 1、在用户界面中输入一个员工的工号，姓名，年龄，工资，绩效，保存在一个本地文本文档中。 2、可以对一个或所有员工的工号，年龄，工资，绩效显示在界面上。 3、可以对所有员工的（工资+绩效）的总数进行排序显示在界面上。

以下是一个简单的人事管理系统的 Java 代码示例，可以满足您的需求：

import java.io.*;
import java.util.*;

class Employee {
    private int id;
    private String name;
    private int age;
    private double salary;
    private double performance;

    public Employee(int id, String name, int age, double salary, double performance) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.salary = salary;
        this.performance = performance;
    }

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

    public double getSalary() {
        return salary;
    }

    public double getPerformance() {
        return performance;
    }

    public double getTotal() {
        return salary + performance;
    }
}

class EmployeeManagementSystem {
    private static List<Employee> employees = new ArrayList<Employee>();

    public static void addEmployee(Employee employee) {
        employees.add(employee);
        saveEmployees();
    }

    public static void showEmployeeInfo() {
        System.out.println("ID\tName\tAge\tSalary\tPerformance");
        for (Employee employee : employees) {
            System.out.println(employee.getId() + "\t" + employee.getName() + "\t" + employee.getAge() + "\t" + employee.getSalary() + "\t" + employee.getPerformance());
        }
    }

    public static void sortByTotal() {
        Collections.sort(employees, new Comparator<Employee>() {
            public int compare(Employee e1, Employee e2) {
                if (e1.getTotal() < e2.getTotal()) {
                    return 1;
                } else if (e1.getTotal() > e2.getTotal()) {
                    return -1;
                } else {
                    return 0;
                }
            }
        });

        System.out.println("ID\tName\tAge\tSalary\tPerformance\tTotal");
        for (Employee employee : employees) {
            System.out.println(employee.getId() + "\t" + employee.getName() + "\t" + employee.getAge() + "\t" + employee.getSalary() + "\t" + employee.getPerformance() + "\t" + employee.getTotal());
        }
    }

    private static void saveEmployees() {
        try {
            FileWriter fileWriter = new FileWriter("employees.txt");
            for (Employee employee : employees) {
                fileWriter.write(employee.getId() + "," + employee.getName() + "," + employee.getAge() + "," + employee.getSalary() + "," + employee.getPerformance() + "\n");
            }
            fileWriter.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static void loadEmployees() {
        try {
            File file = new File("employees.txt");
            if (!file.exists()) {
                return;
            }

            BufferedReader bufferedReader = new BufferedReader(new FileReader(file));
            String line;
            while ((line = bufferedReader.readLine()) != null) {
                String[] parts = line.split(",");
                int id = Integer.parseInt(parts[0]);
                String name = parts[1];
                int age = Integer.parseInt(parts[2]);
                double salary = Double.parseDouble(parts[3]);
                double performance = Double.parseDouble(parts[4]);
                Employee employee = new Employee(id, name, age, salary, performance);
                employees.add(employee);
            }
            bufferedReader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        loadEmployees();

        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("Please choose an operation:");
            System.out.println("1. Add employee");
            System.out.println("2. Show employee info");
            System.out.println("3. Sort by total salary");
            System.out.println("4. Exit");

            int choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    System.out.println("Please input employee info:");
                    System.out.print("ID: ");
                    int id = scanner.nextInt();
                    System.out.print("Name: ");
                    String name = scanner.next();
                    System.out.print("Age: ");
                    int age = scanner.nextInt();
                    System.out.print("Salary: ");
                    double salary = scanner.nextDouble();
                    System.out.print("Performance: ");
                    double performance = scanner.nextDouble();
                    Employee employee = new Employee(id, name, age, salary, performance);
                    addEmployee(employee);
                    break;
                case 2:
                    showEmployeeInfo();
                    break;
                case 3:
                    sortByTotal();
                    break;
                case 4:
                    System.exit(0);
                    break;
                default:
                    System.out.println("Invalid choice!");
                    break;
            }
        }
    }
}

注意：这只是一个简单的示例，实际应用中可能需要更多的功能和错误处理。