Java项目：员工管理系统（运用数组、面向对象）老师示范
Java项目之员工管理系统：
项目要求：
1、利用数组进行员工的增删改查功能
2、运用面向对象的思想
Employee （员工）类：
package com.situ;
/**
* 员工类
*
* @author snow1k
* @date 2022/03/21
*/
public class Employee {
private String id;// 工号
private String name;// 姓名
private String sex;// 性别
private int age;// 年龄
private String email;// 邮箱
public Employee(String id, String name, String sex, int age, String email) {
this.id = id;
this.name = name;
this.sex = sex;
this.age = age;
this.email = email;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}EmployeeManager （员工管理器）类：
package com.situ;
/**
* 员工管理器
*
* @author snow1k
* @date 2022/03/21
*/
public class EmployeeManager {
private Employee[] employeeArray = new Employee[16];
private int count = 0;// 员工的数量
/**
* 根据工号查询唯一员工
*
* @param id
* @return
*/
public Employee findEmployeeById(String id) {
for (int i = 0; i < count; i++) {
if (employeeArray[i].getId().equals(id)) {
return employeeArray[i];
}
}
return null;// 表示未找到
}
/**
* 根据员工姓名查询
*
* @param name
* @return
*/
public Employee[] findEmployeeByName(String name) {
Employee[] result = new Employee[5];
int count = 0;
for (int i = 0; i < this.count; i++) {
if (employeeArray[i].getName().equals(name)) {
if (count >= result.length) {
Employee[] newArray = new Employee[(int)(count * 1.5)];
for (int j = 0; j < count; j++) {
newArray[j] = result[j];
}
// 指向新的数组
result = newArray;
}
result[count] = employeeArray[i];
count++;
}
}
// 返回值
Employee[] rtn = new Employee[count];
for (int i = 0; i < count; i++) {
rtn[i] = result[i];
}
return rtn;// 表示未找到
}
/**
* 添加员工
*
* @param employee
*/
public void addEmployee(Employee employee) {
if (count >= employeeArray.length) {
int len = (int)(count * 1.5);// 扩充之后的数组的长度
// 新数组
Employee[] newArray = new Employee[len];
copyEmployee(newArray);
}
employeeArray[count] = employee;
count++;
}
/**
* 根据工号删除员工
*
* @param id
*/
public boolean deleteEmployeeById(String id) {
boolean found = false;// 是否找到匹配元素
int foundIdx = -1;
for (int i = 0; i < count; i++) {
Employee emp = employeeArray[i];
if (emp.getId().equals(id)) {
found = true;
foundIdx = i;
break;
}
}
if (foundIdx >= 0) {
for (int i = foundIdx; i < count; i++) {
if (i + 1 >= employeeArray.length) {
employeeArray[i] = null;
} else {
employeeArray[i] = employeeArray[i + 1];
}
}
}
return found;
}
/**
* 把旧数组中的元素复制到新数组中
*
* @param newArray
*/
private void copyEmployee(Employee[] newArray) {
for (int i = 0; i < count; i++) {
newArray[i] = employeeArray[i];
}
employeeArray = newArray;
}
/**
* 获取员工个数
*
* @return
*/
public int getCount() {
return count;
}
public Employee[] getEmployeeArray() {
return employeeArray;
}
}Application（程序执行入口）类：
package com.situ;
public class Application {
/**
* 程序执行的入口
*
* @param args
*/
public static void main(String[] args) {
// 创建员工管理器
EmployeeManager manager = new EmployeeManager();
// 创建图形界面
SystemView view = new SystemView(manager);
// 启动界面，开始对用户进行服务
view.start();
}
}SystemView（系统视图）类：
package com.situ;
import java.util.Scanner;
/**
* 系统视图，和用户交互的ui界面
*
* @author snow1k
* @date 2022/03/21
*/
public class SystemView {
public Scanner scanner = new Scanner(System.in);
public EmployeeManager manager;
public SystemView(EmployeeManager manager) {
super();
this.manager = manager;
}
// 启动界面
public void start() {
while (true) {
showMainMenu();
int choice = scanner.nextInt();
switch (choice) {
case 1: {
// 添加员工
showAddEmployeeMenu();
break;
}
case 2: {
// 修改员工
showEditEmployeeMenu();
break;
}
case 3: {
// 查询员工
showSearchEmployeeMenu();
break;
}
case 4: {
// 删除员工
showDeleteEmployeeMenu();
break;
}
case 5: {
// 退出系统
System.out.println("谢谢您使用本系统，欢迎下次再来");
return;
}
default: {
System.out.println("输入有误，请重新输入");
}
}
}
}
/**
* 显示主操作界面
*/
private void showMainMenu() {
System.out.println("*******************************************************************");
System.out.println("***************************思途员工管理系统************************");
System.out.println("******1.添加员工 2.修改员工 3.查询员工 4.删除员工 5.退出系统");
System.out.println("请选择您要进行的操作：");
}
/**
* 删除员工
*/
private void showDeleteEmployeeMenu() {
while (true) {
System.out.println("请输入你要删除的员工编号：");
String choice = scanner.next();
// 删除员工
boolean success = manager.deleteEmployeeById(choice);
if (success) {
System.out.println("删除成功");
} else {
System.out.println("查无此员工");
}
System.out.println("是否继续删除？Y/N");
choice = scanner.next();
if (choice.toLowerCase().equals("y")) {
continue;
} else {
break;
}
}
}
/**
* 查询员工
*/
private void showSearchEmployeeMenu() {
while (true) {
System.out.println("1.打印全部员工信息 2.根据工号查询 3.根据姓名查询");
int choice = scanner.nextInt();
switch (choice) {
case 1: {
// 打印全部员工信息
printEmployee(manager.getEmployeeArray());
break;
}
case 2: {
// 根据工号查询
showSearchByIdMenu();
break;
}
case 3: {
// 根据姓名查询
showSearchByNameMenu();
break;
}
}
System.out.println("是否继续查询？Y/N");
String result = scanner.next();
if (result.toLowerCase().equals("y")) {
continue;
} else {
break;
}
}
}
/**
* 批量打印员工信息
*
* @param employeeArray
*/
private void printEmployee(Employee[] employeeArray) {
System.out.println("员工信息列表：");
for (int i = 0; i < employeeArray.length; i++) {
Employee emp = employeeArray[i];
if (emp != null) {
System.out.println(i + 1 + ". 工号：" + emp.getId() + " 姓名：" + emp.getName() + " 性别：" + emp.getSex()
+ " 年龄：" + emp.getAge() + " 邮箱：" + emp.getEmail());
}
}
}
/**
* 根据工号查询员工信息
*/
private void showSearchByIdMenu() {
while (true) {
System.out.println("请输入您要查询的员工工号：");
String id = scanner.next();
// 找到要查询的员工
Employee emp = manager.findEmployeeById(id);
if (emp == null) {
System.out.println("系统中不存在您要查询的员工，请确认后重试");
} else {
printEmployee(new Employee[] {emp});
}
System.out.println("是否按工号继续查询？Y/N");
String choice = scanner.next();
if (choice.toLowerCase().equals("y")) {
continue;
} else {
break;
}
}
}
/**
* 根据员工姓名查询员工信息
*/
private void showSearchByNameMenu() {
while (true) {
System.out.println("请输入您要查询的员工姓名：");
String name = scanner.next();
// 找到要查询的员工
Employee[] emps = manager.findEmployeeByName(name);
if (emps == null || emps.length == 0) {
System.out.println("系统中不存在您要查询的员工，请确认后重试");
} else {
printEmployee(emps);
}
System.out.println("是否继续按姓名查询？Y/N");
String choice = scanner.next();
if (choice.toLowerCase().equals("y")) {
continue;
} else {
break;
}
}
}
/**
* 显示员工修改菜单
*/
private void showEditEmployeeMenu() {
while (true) {
System.out.println("请输入您要修改的员工工号：");
String id = scanner.next();
// 找到要修改的员工
Employee emp = manager.findEmployeeById(id);
if (emp == null) {
System.out.println("系统中不存在您要修改的员工，请确认后重试");
} else {
printEmployee(new Employee[] {emp});
// 换行
System.out.println();
System.out.println("请输出新的员工姓名：");
String name = scanner.next();
System.out.println("请输出新的员工性别：");
String sex = scanner.next();
System.out.println("请输出新的员工年龄：");
int age = scanner.nextInt();
System.out.println("请输出新的员工邮箱：");
String email = scanner.next();
emp.setName(name);
emp.setSex(sex);
emp.setAge(age);
emp.setEmail(email);
System.out.println("修改员工信息成功!");
}
System.out.println("是否继续修改？Y/N");
String choice = scanner.next();
if (choice.toLowerCase().equals("y")) {
continue;
} else {
break;
}
}
}
/**
* 显示添加员工菜单
*/
private void showAddEmployeeMenu() {
while (true) {
System.out.println("请输出员工编号：");
String id = scanner.next();
System.out.println("请输出员工姓名：");
String name = scanner.next();
System.out.println("请输出员工性别：");
String sex = scanner.next();
System.out.println("请输出员工年龄：");
int age = scanner.nextInt();
System.out.println("请输出员工邮箱：");
String email = scanner.next();
// 创建员工对象
Employee emp = new Employee(id, name, sex, age, email);
manager.addEmployee(emp);
System.out.println("员工添加成功");
System.out.println("是否继续添加？Y/N");
String choice = scanner.next();
if (choice.toLowerCase().equals("y")) {
continue;
} else {
break;
}
}
}
}本文作者：刘广法，转载注明出处。
