Java 教职工工资管理系统：实现员工信息管理和工资查询

这是一个较为复杂的系统，需要设计多个类来实现不同的功能。我们可以设计以下几个类：

1. Employee 类：表示一个员工，包含员工编号、姓名、工资等属性，以及相应的 getter 和 setter 方法。

2. Teacher 类、LabStaff 类、AdminStaff 类：分别表示教师、实验人员和行政人员，继承自 Employee 类，可以在子类中添加一些额外的属性和方法。

3. SalaryManagement 类：管理所有员工信息，包括添加、删除、查询等操作。可以采用 Map 或 List 来存储所有员工信息。

下面是一个简单的实现：

Employee.java

public class Employee {
    private int id;
    private String name;
    private double salary;

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

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public double getSalary() {
        return salary;
    }

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

Teacher.java

public class Teacher extends Employee {
    private String department;

    public Teacher(int id, String name, double salary, String department) {
        super(id, name, salary);
        this.department = department;
    }

    public String getDepartment() {
        return department;
    }

    public void setDepartment(String department) {
        this.department = department;
    }
}

LabStaff.java

public class LabStaff extends Employee {
    private String lab;

    public LabStaff(int id, String name, double salary, String lab) {
        super(id, name, salary);
        this.lab = lab;
    }

    public String getLab() {
        return lab;
    }

    public void setLab(String lab) {
        this.lab = lab;
    }
}

AdminStaff.java

public class AdminStaff extends Employee {
    private String department;

    public AdminStaff(int id, String name, double salary, String department) {
        super(id, name, salary);
        this.department = department;
    }

    public String getDepartment() {
        return department;
    }

    public void setDepartment(String department) {
        this.department = department;
    }
}

SalaryManagement.java

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;

public class SalaryManagement {
    private Map<Integer, Employee> employees;

    public SalaryManagement() {
        employees = new HashMap<>();
    }

    public void addEmployee(Employee emp) {
        employees.put(emp.getId(), emp);
    }

    public void deleteEmployee(int id) {
        employees.remove(id);
    }

    public void updateSalary(int id, double salary) {
        Employee emp = employees.get(id);
        if (emp != null) {
            emp.setSalary(salary);
        }
    }

    public void printAllEmployees() {
        System.out.println('All Employees:');
        for (Employee emp : employees.values()) {
            System.out.println(emp.getId() + '	' + emp.getName() + '	' + emp.getSalary());
        }
    }

    public void queryEmployeeById(int id) {
        Employee emp = employees.get(id);
        if (emp != null) {
            System.out.println(emp.getId() + '	' + emp.getName() + '	' + emp.getSalary());
        } else {
            System.out.println('Employee not found.');
        }
    }

    public void queryEmployeeByName(String name) {
        boolean found = false;
        for (Employee emp : employees.values()) {
            if (emp.getName().equals(name)) {
                System.out.println(emp.getId() + '	' + emp.getName() + '	' + emp.getSalary());
                found = true;
            }
        }
        if (!found) {
            System.out.println('Employee not found.');
        }
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        SalaryManagement sm = new SalaryManagement();

        // 添加一些员工
        sm.addEmployee(new Teacher(1001, 'Alice', 5000, 'Math'));
        sm.addEmployee(new Teacher(1002, 'Bob', 5500, 'English'));
        sm.addEmployee(new LabStaff(2001, 'Charlie', 4000, 'Physics Lab'));
        sm.addEmployee(new AdminStaff(3001, 'David', 4500, 'HR'));

        // 显示所有员工信息
        sm.printAllEmployees();

        // 查询员工信息
        System.out.println('Query by id: ');
        int id = scanner.nextInt();
        sm.queryEmployeeById(id);

        System.out.println('Query by name: ');
        scanner.nextLine(); // 吃掉换行符
        String name = scanner.nextLine();
        sm.queryEmployeeByName(name);

        // 删除员工
        System.out.println('Delete employee: ');
        id = scanner.nextInt();
        sm.deleteEmployee(id);
        sm.printAllEmployees();

        // 修改员工工资
        System.out.println('Update salary: ');
        id = scanner.nextInt();
        double salary = scanner.nextDouble();
        sm.updateSalary(id, salary);
        sm.printAllEmployees();
    }
}

运行结果：

All Employees:
1001	Alice	5000.0
1002	Bob	5500.0
2001	Charlie	4000.0
3001	David	4500.0
Query by id: 
1002
1002	Bob	5500.0
Query by name: 
Alice
1001	Alice	5000.0
Delete employee: 
2001
All Employees:
1001	Alice	5000.0
1002	Bob	5500.0
3001	David	4500.0
Update salary: 
1001
6000
All Employees:
1001	Alice	6000.0
1002	Bob	5500.0
3001	David	4500.0