Database

import java.util.ArrayList;
import java.util.List;public class Database implements java.io.Serializable{List<Accounts>accountsList=new ArrayList<>();List<Student>studentList=new ArrayList<>();AccountsInOut accountsInOut=new AccountsInOut();InAndOut inAndOut=new InAndOut();public Database(){try{accountsList=accountsInOut.inPut();studentList=inAndOut.inPut();}catch (Exception e){System.out.println(e.getMessage());}}public void accountOut(List<Accounts>list){accountsInOut.outPut(list);}public void studentOut(List<Student>list){inAndOut.outPut(list);}public List<Student> getStudentList() {return studentList;}public void setStudentList(List<Student> studentList) {this.studentList = studentList;}public List<Accounts> getAccountsList() {return accountsList;}public void setAccountsList(List<Accounts> accountsList) {this.accountsList = accountsList;}
}

Accounts

Accounts

public class Accounts implements java.io.Serializable{private String userName;private String passWord;public Accounts(String userName, String passWord) {this.userName = userName;this.passWord = passWord;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getPassWord() {return passWord;}public void setPassWord(String passWord) {this.passWord = passWord;}
}

AccountsInOut

import java.io.*;
import java.util.ArrayList;
import java.util.List;public class AccountsInOut  {public  void outPut(List<Accounts> list){try {FileOutputStream outputStream = new FileOutputStream("G:\\Accounts.txt");ObjectOutputStream objectOutputStream = new ObjectOutputStream(outputStream);objectOutputStream.writeObject(list);objectOutputStream.flush();objectOutputStream.close();outputStream.close();}catch (Exception e){}}public  List<Accounts> inPut (){List<Accounts>list=new ArrayList<>();try{FileInputStream inputStream=new FileInputStream("G:\\Accounts.txt");ObjectInputStream objectInputStream=new ObjectInputStream(inputStream);list=(List<Accounts>)objectInputStream.readObject();objectInputStream.close();inputStream.close();return list;}catch (Exception e){return list;}}
}

Student

Student

public class Student implements java.io.Serializable{//学号、姓名、专业、四门课成绩、总分、名次private String num;private String name;private String major;private double class1Score;private double class2Score;private double class3Score;private double class4Score;private double sum;private int place;public Student(String num, String name, String major, double class1Score, double class2Score, double class3Score, double class4Score) {this.num = num;this.name = name;this.major = major;this.class1Score = class1Score;this.class2Score = class2Score;this.class3Score = class3Score;this.class4Score = class4Score;this.sum=class1Score+class2Score+class3Score+class4Score;}public String getNum() {return num;}public void setNum(String num) {this.num = num;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getMajor() {return major;}public void setMajor(String major) {this.major = major;}public double getClass1Score() {return class1Score;}public void setClass1Score(double class1Score) {this.class1Score = class1Score;}public double getClass2Score() {return class2Score;}public void setClass2Score(double class2Score) {this.class2Score = class2Score;}public double getClass3Score() {return class3Score;}public void setClass3Score(double class3Score) {this.class3Score = class3Score;}public double getClass4Score() {return class4Score;}public void setClass4Score(double class4Score) {this.class4Score = class4Score;}public double getSum() {return sum;}public void setSum(double sum) {this.sum = sum;}public int getPlace() {return place;}public void setPlace(int place) {this.place = place;}
}

StudentSys

import DAO.AccountsDao;
import DAO.StudentDao;import java.util.List;
import java.util.Scanner;public class StudentSys {Database database;StudentDao studentDao;AccountsDao accountsDao;Scanner scanner=new Scanner(System.in);public StudentSys(Database database){this.database=database;studentDao=new StudentDao(database);accountsDao=new AccountsDao(database);}public void loginPage(){System.out.println("学生成绩档案管理系统");System.out.println("1.登录");System.out.println("2.注册");System.out.println("3.退出系统");System.out.println("请输入你的选择：");String input=scanner.next();switch (input){case "1":login();break;case "2":register();loginPage();break;case "3":System.out.println("系统已经退出");break;default:{System.out.println("非法输入，请重新输入");loginPage();}}}/*** 登录*/public void login(){Accounts accounts1=null;Boolean find=false;System.out.println("请输入账号");String userName=scanner.next();List<Accounts> list=database.getAccountsList();for(Accounts accounts:list){if(userName.equals(accounts.getUserName())){accounts1=accounts;find=true;break;}}if(find==true){System.out.println("请输入密码");String passWord=scanner.next();if(passWord.equals(accounts1.getPassWord())){System.out.println("登录成功");mainPage();}else{System.out.println("密码错误，请重新登录");login();}}else {System.out.println("账号不存在");loginPage();}}/*** 注册*/public void register(){System.out.println("请输入账号");String userName=scanner.next();System.out.println("请输入密码");String passWord=scanner.next();accountsDao.add(new Accounts(userName,passWord));System.out.println("注册成功");database.accountOut(database.getAccountsList());}/*** 主界面*/public void mainPage(){System.out.println("1.新增学生信息");System.out.println("2.浏览学生信息");System.out.println("3.查找学生信息");System.out.println("4.删除学生信息");System.out.println("5.退出登录");System.out.println("请输入你的选择：");String choose=scanner.next();switch (choose){case "1":add();mainPage();break;case "2":showInformation();mainPage();break;case "3":search();break;case "4":delete();mainPage();break;case "5":database.studentOut(database.getStudentList());loginPage();break;default:System.out.println("非法输入，请重新选择");mainPage();}}/*** 新增学生信息*/public void add(){System.out.println("学生学号：");String num=scanner.next();System.out.println("学生姓名：");String name=scanner.next();System.out.println("学生专业：");String major=scanner.next();System.out.println("课程1成绩：");double class1Score=scanner.nextDouble();System.out.println("课程2成绩：");double class2Score=scanner.nextDouble();System.out.println("课程3成绩：");double class3Score=scanner.nextDouble();System.out.println("课程4成绩：");double class4Score=scanner.nextDouble();studentDao.add(new Student(num,name,major,class1Score,class2Score,class3Score,class4Score));}/*** 展示学生信息*/public void showInformation(){List<Student> list=null;studentDao.show();System.out.println("选择排序方法：");System.out.println("1.双向冒泡排序");System.out.println("2.希尔排序");System.out.println("3.快速排序");System.out.println("4.堆排序");System.out.println("5.返回上一级");System.out.println("请输入你的选择");String choose=scanner.next();switch (choose){case "1":list=studentDao.doubleBubbleSort(database.getStudentList());studentDao.showPlace(list);break;case "2":list=studentDao.shellSort(database.getStudentList());studentDao.showPlace(list);break;case "3":list=studentDao.quickSort(database.getStudentList());studentDao.showPlace(list);break;case "4":list=studentDao.heapSort(database.getStudentList());studentDao.showPlace(list);break;case "5":break;}}/*** 查找学生信息*/public void search(){studentDao.show();System.out.println("1.按学号查找");System.out.println("2.按姓名查找");System.out.println("3.返回上一级");System.out.println("请输入选项：");String choose=scanner.next();switch (choose){case "1":searchByNum();break;case "2":searchByName();break;case "3":mainPage();break;default:System.out.println("非法输入，请重新输入");search();}}/*** 删除学生信息*/public void delete(){studentDao.show();System.out.println("要删除的学号：");String num=scanner.next();Student student=studentDao.searchByNum(num);studentDao.delete(student);System.out.println("删除成功");}public void searchByName(){System.out.println("请输入要查找的姓名：");String name=scanner.next();Student student;student=studentDao.searchByName(name);System.out.println(" 学号："+student.getNum()+" 姓名："+student.getName()+" 专业："+student.getMajor()+" 课程1成绩："+student.getClass1Score()+" 课程2成绩："+student.getClass2Score()+" 课程3成绩："+student.getClass3Score()+" 课程4成绩："+student.getClass4Score());System.out.println("是否修改成绩（Y\\N）");String choose=scanner.next();if(choose.equals("Y")){System.out.println("修改第几门课成绩：");String input=scanner.next();double score;switch (input){case "1":score=scanner.nextDouble();student.setClass1Score(score);break;case "2":score=scanner.nextDouble();student.setClass2Score(score);break;case "3":score=scanner.nextDouble();student.setClass3Score(score);break;case "4":score=scanner.nextDouble();student.setClass4Score(score);break;default:System.out.println("输入错误");searchByName();}student.setSum(student.getClass1Score()+student.getClass2Score()+student.getClass3Score()+student.getClass4Score());mainPage();}else{mainPage();}}public void searchByNum(){System.out.println("请输入要查找的学号：");String num=scanner.next();Student student;student=studentDao.searchByNum(num);System.out.println(" 学号："+student.getNum()+" 姓名："+student.getName()+" 专业："+student.getMajor()+" 课程1成绩："+student.getClass1Score()+" 课程2成绩："+student.getClass2Score()+" 课程3成绩："+student.getClass3Score()+" 课程4成绩："+student.getClass4Score());System.out.println("是否修改成绩（Y\\N）");String choose=scanner.next();if(choose.equals("Y")){System.out.println("修改第几门课成绩：");String input=scanner.next();double score;switch (input){case "1":score=scanner.nextDouble();student.setClass1Score(score);break;case "2":score=scanner.nextDouble();student.setClass2Score(score);break;case "3":score=scanner.nextDouble();student.setClass3Score(score);break;case "4":score=scanner.nextDouble();student.setClass4Score(score);break;default:System.out.println("输入错误");searchByNum();}student.setSum(student.getClass1Score()+student.getClass2Score()+student.getClass3Score()+student.getClass4Score());mainPage();}else{mainPage();}}
}

DAO

AccountsDao

import system.Accounts;
import system.Database;public class AccountsDao {Database database;public AccountsDao(Database database){this.database=database;}public void add(Accounts accounts){database.getAccountsList().add(accounts);}
}

StudentDao

import system.Database;
import system.Student;import java.util.List;public class StudentDao {Database database;public StudentDao(Database database){this.database=database;}public void add(Student student){database.getStudentList().add(student);}public void show(){List<Student> list=database.getStudentList();int n=1;for(Student student:list){System.out.println("编号"+n+" 学号："+student.getNum()+" 姓名："+student.getName()+" 专业："+student.getMajor()+" 课程1成绩："+student.getClass1Score()+" 课程2成绩："+student.getClass2Score()+" 课程3成绩："+student.getClass3Score()+" 课程4成绩："+student.getClass4Score()+" 总分："+student.getSum());n++;}}public void delete(Student student){Student student1=null;for(Student each:database.getStudentList()){if(student.getNum().equals(each.getNum())){student1=each;}}database.getStudentList().remove(student1);}public Student searchByNum(String num){Student student=null;for(Student each:database.getStudentList()){if(num.equals(each.getNum())){student=each;}}return student;}public Student searchByName(String name){Student student=null;for(Student each:database.getStudentList()){if(name.equals(each.getName())){student=each;}}return student;}/*** 双向冒泡排序* @param studentList* @return*/public List<Student> doubleBubbleSort(List<Student> studentList){List<Student> list=studentList;Student student=null;int left=0,right=studentList.size()-1;while(left<right){for(int i=left+1;i<=right;i++){if(list.get(left).getSum()<list.get(i).getSum()){student=list.get(i);list.set(i,list.get(left));list.set(left,student);}}left++;for(int i=right-1;i>=left;i--){if(list.get(right).getSum()>list.get(i).getSum()){student=list.get(i);list.set(i,list.get(right));list.set(right,student);}}right--;}return list;}/*** 快速排序* @param studentList* @return*/public List<Student> quickSort(List<Student> studentList){List<Student> list=studentList;quickSort1(list,0,list.size()-1);return list;}public void quickSort1(List<Student> studentList,int left,int right){if(left<right){int i=left,j=right;Student student=studentList.get(left);double x=student.getSum();while(i<j){while((i<j)&&(studentList.get(j).getSum()<x)){j--;}if(i<j){studentList.set(i,studentList.get(j));i++;}while((i<j)&&(studentList.get(i).getSum()>x)){i++;}if(i<j){studentList.set(j,studentList.get(i));j--;}}studentList.set(i,student);quickSort1(studentList,left,i-1);quickSort1(studentList,i+1,right);}}/*** 希尔排序* @param studentList* @return*/public List<Student> shellSort(List<Student> studentList){List<Student> list=studentList;Student student=null;int j;for (int gap = list.size() / 2; gap >  0; gap /= 2) {for (int i = gap; i < list.size(); i++) {student=list.get(i);double tmp=student.getSum();for (j = i; j >= gap && tmp>list.get(j-gap).getSum(); j -= gap) {list.set(j,list.get(j-gap));}list.set(j,student);}}return list;}/*** 堆排序* @param studentList* @return*/public List<Student> heapSort(List<Student> studentList){List<Student> list=studentList;int len = list.size();buildMaxHeap(list, len);for (int i = len - 1; i > 0; i--) {swap(list, 0, i);len--;heapify(list, 0, len);}return list;}private void buildMaxHeap(List<Student> studentList, int len) {for (int i = (int) Math.floor(len / 2); i >= 0; i--) {heapify(studentList, i, len);}}private void heapify(List<Student> studentList, int i, int len) {int left = 2 * i + 1;int right = 2 * i + 2;int largest = i;if (left < len && studentList.get(left).getSum() < studentList.get(largest).getSum()) {largest = left;}if (right < len && studentList.get(right).getSum() < studentList.get(largest).getSum()) {largest = right;}if (largest != i) {swap(studentList, i, largest);heapify(studentList, largest, len);}}private void swap(List<Student> studentList, int i, int j) {Student student=studentList.get(i);studentList.set(i,studentList.get(j));studentList.set(j,student);}/*** 排名赋值并打印* @param studentList*/public void showPlace(List<Student> studentList){for(int i=0;i<studentList.size();i++){studentList.get(i).setPlace(i+1);}int i=1;for(Student each:studentList){System.out.println(i+"."+" 姓名 "+each.getName()+" 专业 "+each.getMajor()+" 总分 "+each.getSum()+" 名次 "+each.getPlace());i++;}}
}

InAndOut

import java.io.*;
import java.util.ArrayList;
import java.util.List;public class InAndOut {public  void outPut(List<Student>list){try {FileOutputStream outputStream = new FileOutputStream("G:\\test.txt");ObjectOutputStream objectOutputStream = new ObjectOutputStream(outputStream);objectOutputStream.writeObject(list);objectOutputStream.flush();objectOutputStream.close();outputStream.close();}catch (Exception e){}}public  List<Student> inPut(){List<Student>list=new ArrayList<>();try{FileInputStream inputStream=new FileInputStream("G:\\test.txt");ObjectInputStream objectInputStream=new ObjectInputStream(inputStream);list=(List<Student>)objectInputStream.readObject();objectInputStream.close();inputStream.close();return list;}catch(IOException i){return list;}catch(ClassNotFoundException c){return list;}catch (Exception e){return list;}}
}

Main

public class Main {public static void main(String[]args){Database database = new Database();StudentSys studentSys=new StudentSys(database);studentSys.loginPage();}
}

实验截图

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