文章目录
- 1、创建学生实体类
- 2、创建students.txt
- 3、创建名片管理类
- 1）创建主菜单
- 2）创建登录方法
- 3）创建学生管理方法
- 4）创建添加学生方法
- 5）创建保存学生信息方法
- 6）创建读取学生文件方法
- 7）创建查询学生方法
- 8）创建修改名片方法
- 创建名片管理类的完整代码
- 运行结果
1、创建学生实体类
- 在s02.t01里创建Student实体类
package t01;
/**
* 功能：学生实体类
* 作者：小小榕
*/
public class Student {
private String id;
private String name;
private String sex;
private String age;
private String clazz;
private String professional;
private String department;
private String telephone;
public Student() {
}
public Student(String id,String name, String sex, String age, String clazz, String professional, String department, String telephone) {
this.id = id;
this.name = name;
this.sex = sex;
this.age = age;
this.clazz = clazz;
this.professional = professional;
this.department = department;
this.telephone = telephone;
}
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 String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getClazz() {
return clazz;
}
public void setClazz(String clazz) {
this.clazz = clazz;
}
public String getProfessional() {
return professional;
}
public void setProfessional(String professional) {
this.professional = professional;
}
public String getDepartment() {
return department;
}
public void setDepartment(String department) {
this.department = department;
}
public String getTelephone() {
return telephone;
}
public void setTelephone(String telephone) {
this.telephone = telephone;
}
@Override
public String toString() {
return "Student{" +
"id='" + id + '\'' +
", name='" + name + '\'' +
", sex='" + sex + '\'' +
", age=" + age +
", clazz='" + clazz + '\'' +
", professional='" + professional + '\'' +
", department='" + department + '\'' +
", telephone='" + telephone + '\'' +
'}';
}
}2、创建students.txt
3、创建名片管理类
- 在s02.t01包里创建StudentManagement类
1）创建主菜单
public class StudentManagement {
private static ArrayList<Student> students = new ArrayList<>();
public static void main(String[] args) {
int mc1;
Scanner sc = new Scanner(System.in);
Boolean isRunning = true;
while (isRunning) {
// 绘制一级菜单
System.out.println(" 学生管理系统");
System.out.println("================");
System.out.println(" 1. 登录");
System.out.println(" 0. 退出");
System.out.println("================");
System.out.print("输入菜单编号[1,0]：");
mc1 = sc.nextInt();
// 根据用户选择进行相应的操作
switch (mc1) {
case 1:
// 调用登录方法
login();
break;
case 0:
System.out.println("谢谢使用~再见~");
isRunning = false; // 结束循环
break;
default:
System.out.println("输入的菜单编号有误！");
}
}
}
}2）创建登录方法
- 在StudentManagement类里创建login()方法
/**
* 登录方法
*/
private static void login() {
String username, password;
Scanner sc = new Scanner(System.in);
System.out.print("用户名：");
username = sc.next();
System.out.print("密 码：");
password = sc.next();
if (username.equals("xiaoxiaorong") && password.equals("212603")) {
System.out.println("登录成功~");
// 调用名片管理方法
StudentManagement();
} else {
System.out.println("用户名或密码有误，登录失败~");
}
}3）创建学生管理方法
- 在StudentManagement类里创建studentManagement()方法
/**
* 学生管理方法
*/
private static void studentManagement() {
int mc2;
Scanner sc = new Scanner(System.in);
boolean isRunning = true; // 循环控制变量
while (isRunning) {
// 绘制二级菜单
System.out.println("=======学生管理========");
System.out.println(" 1. 添加学生");
System.out.println(" 2. 修改学生");
System.out.println(" 3. 查询学生");
System.out.println(" 4. 删除学生");
System.out.println(" 5. 读取学生");
System.out.println(" 6. 保存学生");
System.out.println(" 7. 返回上级");
System.out.println("=======================");
System.out.print("输入菜单编号[1,2,3,4,5,6,7]：");
mc2 = sc.nextInt();
switch (mc2) {
case 1:
System.out.println("执行添加学生功能~");
addStudent();
break;
case 2:
modifyStudent(); //调用添加学生方法
System.out.println("执行修改学生功能~");
break;
case 3:
findStudent();
System.out.println("执行查询学生功能~");
break;
case 4:
System.out.println("执行删除学生功能~");
break;
case 5:
readStudentFile(); // 调用读取学生文件方法
System.out.println("读取学生文件到学生数组列表~");
break;
case 6:
saveStudents(); // 调用保存学生方法
System.out.println("将学生数组列表写入学生文件~");
break;
case 7:
isRunning = false; // 结束二级菜单循环
break;
default:
System.out.println("输入的菜单编号有误！");
}
}
}4）创建添加学生方法
- 在StudentManagement类里创建addStudent()方法
/**
* 添加学生信息方法
*/
private static void addStudent() {
// 声明变量
String id;
String name;
String sex;
String age;
String clazz;
String professional;
String department;
String telephone;
Scanner sc = new Scanner(System.in);
// 输入学生信息
System.out.print("学号：");
id = sc.next();
System.out.print("姓名：");
name = sc.next();
System.out.print("性别：");
sex= sc.next();
System.out.print("年龄：");
age = sc.next();
System.out.print("班级：");
clazz = sc.next();
System.out.print("专业：");
professional = sc.next();
System.out.print("系别：");
department = sc.next();
System.out.print("手机：");
telephone = sc.next();
// 创建学生对象
Student student = new Student(id, name, sex, age, clazz, professional, department, telephone);
// 将学生对象添加学生数组列表
students.add(student);
}5）创建保存学生信息方法
- 在StudentManagement类里创建saveStudent()方法
/**
* 保存学生到文件
*/
private static void saveStudents() {
try{
// 创建文件字符输出流
FileWriter fw = new FileWriter("students.txt");
// 创建学生容器字符串缓冲对象
StringBuffer studentsBuffer = new StringBuffer();
// 用增强for循环遍历学生数字列表
for (Student student : students) {
// 输出学生对象
System.out.println(student);
// 创建学生字符串缓冲对象
StringBuffer buffer = new StringBuffer();
// 添加名片字段信息（空格最为分隔符）
buffer.append(student.getId() + " ");
buffer.append(student.getName() + " ");
buffer.append(student.getSex() + " ");
buffer.append(student.getAge() + " ");
buffer.append(student.getClazz() + " ");
buffer.append(student.getProfessional() + " ");
buffer.append(student.getDepartment() + " ");
buffer.append(student.getTelephone());
// 将学生信息写入学生文件（必须添加换行符）
studentsBuffer.append(buffer.toString() + "\n");
}
// 将学生容器字符串缓冲对象里的数据写入文件
fw.write(studentsBuffer.toString());
// 关闭文件字符输出流
fw.close();
// 提示学生写入成功
System.out.println("恭喜，学生数据成功写入文件~");
} catch (IOException e) {
e.printStackTrace();
}
}6）创建读取学生文件方法
- 在StudentManagement类里创建readStudentFile()方法
/**
* 读取学生文件，保存到学生数组列表
*/
private static void readStudentFile() {
try {
// 创建文件字符输入流
FileReader fr = new FileReader("students.txt");
// 创建缓冲字符输入流
BufferedReader br = new BufferedReader(fr);
// 定义行变量
String nextLine = "";
// 通过循环读取学生文件
while ((nextLine = br.readLine()) != null) {
// 拆分行字符串得到字段数组
String[] fields = nextLine.split(" ");
// 创建学生对象
Student student = new Student();
// 用字段数组来设置对象属性
student.setId(fields[0]);
student.setName(fields[1]);
student.setSex(fields[2]);
student.setAge(fields[3]);
student.setClazz(fields[4]);
student.setProfessional(fields[5]);
student.setDepartment(fields[6]);
student.setTelephone(fields[7]);
// 输出学生对象
System.out.println("读取：" + student);
// 将学生对象添加到学生数组列表
students.add(student);
}
// 关闭缓冲字符输入流
br.close();
// 关闭文件字符输入流
fr.close();
}catch (FileNotFoundException e) {
System.out.println("温馨提示：学生文件不存在~");
}catch (IOException e) {
e.printStackTrace();
}
}7）创建查询学生方法
- 在StudentManagement类里创建findStudent()方法
/**
* 查询学生方法
*/
private static void findStudent() {
String id, name;
Scanner sc = new Scanner(System.in);
System.out.print("编号：");
id = sc.nextLine(); // 不能使用next()方法
System.out.print("姓名：");
name = sc.nextLine(); // 不能使用next()方法
// 判断用户按哪种方式查询学生
if (id.equals(" ")) {
if (name.equals(" ")) { // 查询全部学生
// 遍历学生数组列表
for (Student student:students) {
System.out.println(student.getId() + " "
+ student.getName() + " "
+ student.getSex() + " "
+student.getAge() + " "
+student.getClazz() + " "
+student.getProfessional() + " "
+student.getDepartment() + " "
+student.getTelephone());
}
}else { // 按姓名查询名片
System.out.println("~按姓名查询学生信息~");
Boolean found = false;
// 遍历学生数组列表，按姓名来找
for (Student student: students) {
if (student.getName().equals(name)) {
found = true; // 找到了
break; // 跳出循环
}
}
// 根据found值提示用户
if (found) {
// 针对同名情况
for (Student student: students) {
if (student.getName().equals(name)) {
System.out.println(student.getId() + " "
+ student.getName() + " "
+ student.getSex() + " "
+student.getAge() + " "
+student.getClazz() + " "
+student.getProfessional() + " "
+student.getDepartment() + " "
+student.getTelephone());
}
}
} else {
System.out.println("温馨提示：查无此人~");
}
}
}else {
if (name.equals("")) { // 按编号查询学生
System.out.println("~按编号查询学生~");
Boolean found = false;
// 遍历学生数组列表，按编号来找
for (Student student:students) {
if (student.getId().equals(id)) {
found = true; // 找到了
// 输出学生信息
System.out.println(student.getId() + " "
+ student.getName() + " "
+ student.getSex() + " "
+student.getAge() + " "
+student.getClazz() + " "
+student.getProfessional() + " "
+student.getDepartment() + " "
+student.getTelephone());
break; // 跳出循环
}
}
// 根据found值提示用户
if (!found) {
System.out.println("温馨提示：查无此人~");
}
} else { // 按编号和姓名查询学生
System.out.println("~按编号和姓名来查询名片~");
Boolean found = false;
// 遍历学生数组列表，按编号和姓名来找
for (Student student:students) {
if (student.getId().equals(id) && student.getName().equals(name)) {
found = true; // 找到了
// 输出学生信息
System.out.println(student.getId() + " "
+ student.getName() + " "
+ student.getSex() + " "
+student.getAge() + " "
+student.getClazz() + " "
+student.getProfessional() + " "
+student.getDepartment() + " "
+student.getTelephone());
break; // 跳出循环
}
// 根据found值提示用户
if (!found) {
System.out.println("温馨提示：查无此人~");
}
}
}
}
}8）创建修改名片方法
- 在StudentManagement类里创建modifyStudent()方法
/**
* 修改学生方法
*/
private static void modifyStudent() {
String id, name, sex, age, clazz, professional, department,telephone;
Scanner sc = new Scanner(System.in);
boolean found = false;
System.out.print("输入待修改者编号：");
id = sc.nextLine();
// 遍历学生列表数组
for (Student student : students) {
if (student.getId().equals(id)) {
found = true; // 找到了
// 输出学生信息
System.out.println(student.getId() + " "
+ student.getName() + " "
+ student.getSex() + " "
+student.getAge() + " "
+student.getClazz() + " "
+student.getProfessional() + " "
+student.getDepartment() + " "
+student.getTelephone());
break; // 跳出循环
}
}
// 判断是否找到学生
if (found) {
System.out.println("说明：不输入信息，直接敲回车，表明不修改字段值");
System.out.print("学号：");
id = sc.nextLine();
System.out.print("姓名：");
name = sc.nextLine();
System.out.print("性别：");
sex= sc.nextLine();
System.out.print("年龄：");
age = sc.nextLine();
System.out.print("班级：");
clazz = sc.nextLine();
System.out.print("专业：");
professional = sc.nextLine();
System.out.print("系别：");
department = sc.nextLine();
System.out.print("手机：");
telephone = sc.nextLine();
// 采用传统for循环遍历学生数组列表
for (int i = 0; i < students.size(); i++) {
// 获取学生对象
Student student = students.get(i);
if (student.getId().equals(id)) { // 按编号找到学生
// 根据用户输入修改学生对象
if (!name.equals("")) {
student.setName(name);
}
if (!sex.equals("")) {
student.setSex(sex);
}
if (!age.equals("")) {
student.setAge(age);
}
if (!clazz.equals("")) {
student.setClazz(clazz);
}
if (!professional.equals("")) {
student.setProfessional(professional);
}
if (!department.equals("")) {
student.setDepartment(department);
}
if (!telephone.equals("")) {
student.setTelephone(telephone);
}
// 用修改后的学生对象去更新学生数组列表对应的元素
students.set(i, student);
// 显示修改的数组列表对应元素
System.out.println(students.get(i));
break; // 跳出循环
}
}
} else {
System.out.println("温馨提示：查无此人~");
}
}创建名片管理类的完整代码
package t01;
import java.io.*;
import java.util.ArrayList;
import java.util.Scanner;
public class StudentManagement {
private static ArrayList<Student> students = new ArrayList<>();
public static void main(String[] args) {
int mc1;
Scanner sc = new Scanner(System.in);
Boolean isRunning = true;
while (isRunning) {
// 绘制一级菜单
System.out.println(" 学生管理系统");
System.out.println("================");
System.out.println(" 1. 登录");
System.out.println(" 0. 退出");
System.out.println("================");
System.out.print("输入菜单编号[1,0]：");
mc1 = sc.nextInt();
// 根据用户选择进行相应的操作
switch (mc1) {
case 1:
// 调用登录方法
login();
break;
case 0:
System.out.println("谢谢使用~再见~");
isRunning = false; // 结束循环
break;
default:
System.out.println("输入的菜单编号有误！");
}
}
}
/**
* 登录方法
*/
private static void login() {
String username, password;
Scanner sc = new Scanner(System.in);
System.out.print("用户名：");
username = sc.next();
System.out.print("密 码：");
password = sc.next();
if (username.equals("xiaoxiaorong") && password.equals("212603")) {
System.out.println("登录成功~");
// 调用名片管理方法
studentManagement();
} else {
System.out.println("用户名或密码有误，登录失败~");
}
}
/**
* 学生管理方法
*/
private static void studentManagement() {
int mc2;
Scanner sc = new Scanner(System.in);
boolean isRunning = true; // 循环控制变量
while (isRunning) {
// 绘制二级菜单
System.out.println("=======学生管理========");
System.out.println(" 1. 添加学生");
System.out.println(" 2. 修改学生");
System.out.println(" 3. 查询学生");
System.out.println(" 4. 删除学生");
System.out.println(" 5. 读取学生");
System.out.println(" 6. 保存学生");
System.out.println(" 7. 返回上级");
System.out.println("=======================");
System.out.print("输入菜单编号[1,2,3,4,5,6,7]：");
mc2 = sc.nextInt();
switch (mc2) {
case 1:
System.out.println("执行添加学生功能~");
addStudent();
break;
case 2:
modifyStudent(); //调用添加学生方法
System.out.println("执行修改学生功能~");
break;
case 3:
findStudent();
System.out.println("执行查询学生功能~");
break;
case 4:
System.out.println("执行删除学生功能~");
break;
case 5:
readStudentFile(); // 调用读取学生文件方法
System.out.println("读取学生文件到学生数组列表~");
break;
case 6:
saveStudents(); // 调用保存学生方法
System.out.println("将学生数组列表写入学生文件~");
break;
case 7:
isRunning = false; // 结束二级菜单循环
break;
default:
System.out.println("输入的菜单编号有误！");
}
}
}
/**
* 添加学生信息方法
*/
private static void addStudent() {
// 声明变量
String id;
String name;
String sex;
String age;
String clazz;
String professional;
String department;
String telephone;
Scanner sc = new Scanner(System.in);
// 输入学生信息
System.out.print("学号：");
id = sc.next();
System.out.print("姓名：");
name = sc.next();
System.out.print("性别：");
sex= sc.next();
System.out.print("年龄：");
age = sc.next();
System.out.print("班级：");
clazz = sc.next();
System.out.print("专业：");
professional = sc.next();
System.out.print("系别：");
department = sc.next();
System.out.print("手机：");
telephone = sc.next();
// 创建学生对象
Student student = new Student(id, name, sex, age, clazz, professional, department, telephone);
// 将学生对象添加学生数组列表
students.add(student);
}
/**
* 保存学生到文件
*/
private static void saveStudents() {
try{
// 创建文件字符输出流
FileWriter fw = new FileWriter("students.txt");
// 创建学生容器字符串缓冲对象
StringBuffer studentsBuffer = new StringBuffer();
// 用增强for循环遍历学生数字列表
for (Student student : students) {
// 输出学生对象
System.out.println(student);
// 创建学生字符串缓冲对象
StringBuffer buffer = new StringBuffer();
// 添加名片字段信息（空格最为分隔符）
buffer.append(student.getId() + " ");
buffer.append(student.getName() + " ");
buffer.append(student.getSex() + " ");
buffer.append(student.getAge() + " ");
buffer.append(student.getClazz() + " ");
buffer.append(student.getProfessional() + " ");
buffer.append(student.getDepartment() + " ");
buffer.append(student.getTelephone());
// 将学生信息写入学生文件（必须添加换行符）
studentsBuffer.append(buffer.toString() + "\n");
}
// 将学生容器字符串缓冲对象里的数据写入文件
fw.write(studentsBuffer.toString());
// 关闭文件字符输出流
fw.close();
// 提示学生写入成功
System.out.println("恭喜，学生数据成功写入文件~");
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 读取学生文件，保存到学生数组列表
*/
private static void readStudentFile() {
try {
// 创建文件字符输入流
FileReader fr = new FileReader("students.txt");
// 创建缓冲字符输入流
BufferedReader br = new BufferedReader(fr);
// 定义行变量
String nextLine = "";
// 通过循环读取学生文件
while ((nextLine = br.readLine()) != null) {
// 拆分行字符串得到字段数组
String[] fields = nextLine.split(" ");
// 创建学生对象
Student student = new Student();
// 用字段数组来设置对象属性
student.setId(fields[0]);
student.setName(fields[1]);
student.setSex(fields[2]);
student.setAge(fields[3]);
student.setClazz(fields[4]);
student.setProfessional(fields[5]);
student.setDepartment(fields[6]);
student.setTelephone(fields[7]);
// 输出学生对象
System.out.println("读取：" + student);
// 将学生对象添加到学生数组列表
students.add(student);
}
// 关闭缓冲字符输入流
br.close();
// 关闭文件字符输入流
fr.close();
}catch (FileNotFoundException e) {
System.out.println("温馨提示：学生文件不存在~");
}catch (IOException e) {
e.printStackTrace();
}
}
/**
* 查询学生方法
*/
private static void findStudent() {
String id, name;
Scanner sc = new Scanner(System.in);
System.out.print("编号：");
id = sc.nextLine(); // 不能使用next()方法
System.out.print("姓名：");
name = sc.nextLine(); // 不能使用next()方法
// 判断用户按哪种方式查询学生
if (id.equals(" ")) {
if (name.equals(" ")) { // 查询全部学生
// 遍历学生数组列表
for (Student student:students) {
System.out.println(student.getId() + " "
+ student.getName() + " "
+ student.getSex() + " "
+student.getAge() + " "
+student.getClazz() + " "
+student.getProfessional() + " "
+student.getDepartment() + " "
+student.getTelephone());
}
}else { // 按姓名查询名片
System.out.println("~按姓名查询学生信息~");
Boolean found = false;
// 遍历学生数组列表，按姓名来找
for (Student student: students) {
if (student.getName().equals(name)) {
found = true; // 找到了
break; // 跳出循环
}
}
// 根据found值提示用户
if (found) {
// 针对同名情况
for (Student student: students) {
if (student.getName().equals(name)) {
System.out.println(student.getId() + " "
+ student.getName() + " "
+ student.getSex() + " "
+student.getAge() + " "
+student.getClazz() + " "
+student.getProfessional() + " "
+student.getDepartment() + " "
+student.getTelephone());
}
}
} else {
System.out.println("温馨提示：查无此人~");
}
}
}else {
if (name.equals("")) { // 按编号查询学生
System.out.println("~按编号查询学生~");
Boolean found = false;
// 遍历学生数组列表，按编号来找
for (Student student:students) {
if (student.getId().equals(id)) {
found = true; // 找到了
// 输出学生信息
System.out.println(student.getId() + " "
+ student.getName() + " "
+ student.getSex() + " "
+student.getAge() + " "
+student.getClazz() + " "
+student.getProfessional() + " "
+student.getDepartment() + " "
+student.getTelephone());
break; // 跳出循环
}
}
// 根据found值提示用户
if (!found) {
System.out.println("温馨提示：查无此人~");
}
} else { // 按编号和姓名查询学生
System.out.println("~按编号和姓名来查询名片~");
Boolean found = false;
// 遍历学生数组列表，按编号和姓名来找
for (Student student:students) {
if (student.getId().equals(id) && student.getName().equals(name)) {
found = true; // 找到了
// 输出学生信息
System.out.println(student.getId() + " "
+ student.getName() + " "
+ student.getSex() + " "
+student.getAge() + " "
+student.getClazz() + " "
+student.getProfessional() + " "
+student.getDepartment() + " "
+student.getTelephone());
break; // 跳出循环
}
// 根据found值提示用户
if (!found) {
System.out.println("温馨提示：查无此人~");
}
}
}
}
}
/**
* 修改学生方法
*/
private static void modifyStudent() {
String id, name, sex, age, clazz, professional, department,telephone;
Scanner sc = new Scanner(System.in);
boolean found = false;
System.out.print("输入待修改者编号：");
id = sc.nextLine();
// 遍历学生列表数组
for (Student student : students) {
if (student.getId().equals(id)) {
found = true; // 找到了
// 输出学生信息
System.out.println(student.getId() + " "
+ student.getName() + " "
+ student.getSex() + " "
+student.getAge() + " "
+student.getClazz() + " "
+student.getProfessional() + " "
+student.getDepartment() + " "
+student.getTelephone());
break; // 跳出循环
}
}
// 判断是否找到学生
if (found) {
System.out.println("说明：不输入信息，直接敲回车，表明不修改字段值");
System.out.print("学号：");
id = sc.nextLine();
System.out.print("姓名：");
name = sc.nextLine();
System.out.print("性别：");
sex= sc.nextLine();
System.out.print("年龄：");
age = sc.nextLine();
System.out.print("班级：");
clazz = sc.nextLine();
System.out.print("专业：");
professional = sc.nextLine();
System.out.print("系别：");
department = sc.nextLine();
System.out.print("手机：");
telephone = sc.nextLine();
// 采用传统for循环遍历学生数组列表
for (int i = 0; i < students.size(); i++) {
// 获取学生对象
Student student = students.get(i);
if (student.getId().equals(id)) { // 按编号找到学生
// 根据用户输入修改学生对象
if (!name.equals("")) {
student.setName(name);
}
if (!sex.equals("")) {
student.setSex(sex);
}
if (!age.equals("")) {
student.setAge(age);
}
if (!clazz.equals("")) {
student.setClazz(clazz);
}
if (!professional.equals("")) {
student.setProfessional(professional);
}
if (!department.equals("")) {
student.setDepartment(department);
}
if (!telephone.equals("")) {
student.setTelephone(telephone);
}
// 用修改后的学生对象去更新学生数组列表对应的元素
students.set(i, student);
// 显示修改的数组列表对应元素
System.out.println(students.get(i));
break; // 跳出循环
}
}
} else {
System.out.println("温馨提示：查无此人~");
}
}
}运行结果
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