大commit - 能跑起来了

# 更新概览
ManagerTool:
- 删除学生时新增判空及保存
StudentManager:
- 添加学生时去重，以id和姓名区分
- 信息生成方法生成格式调整（省去末尾换行符）
- 信息生成方法返回值类型修改为String而不是直接生成String
- 拆分部分信息生成方法
- 新增部分对外方法
Worker:
- 完成几乎所有命令的方法调用
- 添加名字可多次添加，以“:wq"完成

readme.md

@@ -6,6 +6,6 @@
 
 就一小作业而已
 
-写的很粗糙，没有仔细考虑，还望谅解 (￣﹏￣；)
+写的很粗糙，没有仔细考虑，性能，扩展性什么的都没有考虑，还望谅解 (￣﹏￣；)
 
 

src/main/java/me/lensfrex/manager/Main.java

@@ -1,34 +1,27 @@
 package me.lensfrex.manager;
 
-import me.lensfrex.manager.utils.IOUtil;
+import me.lensfrex.manager.utils.Console;
+import me.lensfrex.manager.utils.Worker;
 
 import java.io.BufferedReader;
 import java.io.InputStreamReader;
-import java.nio.charset.StandardCharsets;
 
 public class Main {
-    private static final String welcomeMessage = IOUtil.inputStreamToString(Main.class.getResourceAsStream("/me.lensfrex.manager/welcomeMessage.txt"), StandardCharsets.UTF_8);
 
     public static void main(String[] args) {
-        System.out.println(welcomeMessage);
         new Main().run();
     }
 
-    private void run() {
-        while (true) {
-            if (parseCommand(getUserCommand()) == -1) {
-                break;
-            }
-        }
-    }
+    Worker worker = new Worker();
 
-    private String getUserCommand() {
-        BufferedReader command = new BufferedReader(new InputStreamReader(System.in));
-        try {
-            return command.readLine();
-        } catch (Exception e) {
-            e.printStackTrace();
-            return "null";
+    Console consoleTool = new Console();
+
+    private void run() {
+        while (parseCommand(consoleTool.getUserInput()) != -1) {
+            System.out.println(
+                    "****************************************************************\n" +
+                            "    Please enter your choice:"
+            );
         }
     }
 
@@ -38,21 +31,64 @@ public class Main {
             case "0":
                 return -1;
             case "1":
+                System.out.println(Worker.studentInformationExample);
+                for (;;) {
+                    String userInput = consoleTool.getUserInput();
+                    if (userInput.equals(":wq")) {
+                        break;
+                    }
+                    worker.addStudent(userInput);
+                }
+                break;
             case "2":
+                String userInput = consoleTool.getUserInput();
+                //System.out.println("Are you sure to delete" + userInput + "? (yes/no)");
+                try {
+                    long id = Long.parseLong(userInput);
+                    worker.removeStudent(id);
+                } catch (NumberFormatException e) {
+                    worker.removeStudent(userInput);
+                }
+                break;
             case "3":
+                worker.printAllSubjectInfo();
+                break;
             case "4":
+                worker.printAllStudentScoreInfo();
+                break;
             case "5":
+                worker.printRankingTable();
+                break;
             case "6":
+                worker.printScoreTableById();
+                break;
             case "7":
+                worker.printScoreTableByName();
+                break;
             case "8":
             case "9":
+                String input = consoleTool.getUserInput();
+                try {
+                    long id = Long.parseLong(input);
+                    System.out.println(worker.searchById(id));
+                } catch (NumberFormatException e) {
+                    System.out.println(worker.searchByName(input));
+                }
+                break;
             case "10":
-                return 0;
+                System.out.println("Not support yet ：）");
+                System.out.println("It will come out soon.");
+                break;
             case "11":
-                System.out.println(welcomeMessage);
-                return 0;
+                worker.listRecord();
+                break;
+            case "12":
+                worker.printHelp();
+                break;
             default:
-                return 0;
+                System.out.println("Don't recognize... Please enter again. (Enter 12 to show help again)");
+                break;
         }
+        return 0;
     }
 }

src/main/java/me/lensfrex/manager/data/Student.java

@@ -52,5 +52,5 @@ public class Student implements Serializable {
 
     public static Comparator<Student> compareByName = (s1, s2) -> s1.getName().compareTo(s2.getName());
     public static Comparator<Student> compareById = (s1, s2) -> (int) (s1.id - s2.id);
-    public static Comparator<Student> compareByGeneralScore = (s1, s2) -> s1.getGeneralScore() - s2.getGeneralScore();
+    public static Comparator<Student> compareByGeneralScore = (s1, s2) -> s2.getGeneralScore() - s1.getGeneralScore();
 }

src/main/java/me/lensfrex/manager/data/manager/ManagerTool.java

@@ -12,9 +12,10 @@ import java.util.Map;
  */
 public class ManagerTool {
     private final ArrayList<Student> students;
+    private DataLoader dataLoader = new DataLoader();
 
-    protected ManagerTool() {
-        this.students = new DataLoader().load();
+    public ManagerTool() {
+        this.students = dataLoader.load();
     }
 
     public ArrayList<Student> getStudentList() {
@@ -31,6 +32,8 @@ public class ManagerTool {
     protected void addStudent(long id, String name, Map<String, Integer> score) {
         Student student = new Student(id, name, score);
         students.add(student);
+
+        dataLoader.write(students);
     }
 
     /**
@@ -39,7 +42,14 @@ public class ManagerTool {
      * @param id 学生id，long格式
      */
     protected void removeStudent(long id) {
-        students.remove(getStudent(id));
+        Student removedStudent = this.getStudent(id);
+
+        if (removedStudent != null) {
+            students.remove(removedStudent);
+            System.out.println("Removed: " + id);
+        }
+
+        dataLoader.write(students);
     }
 
     /**
@@ -48,7 +58,14 @@ public class ManagerTool {
      * @param name 学生姓名，long格式
      */
     protected void removeStudent(String name) {
-        students.remove(getStudent(name));
+        Student removedStudent = this.getStudent(name);
+
+        if (removedStudent != null) {
+            students.remove(removedStudent);
+            System.out.println("Removed: " + name);
+        }
+
+        dataLoader.write(students);
     }
 
     /**

src/main/java/me/lensfrex/manager/data/manager/StudentManager.java

@@ -16,6 +16,10 @@ public class StudentManager {
         this.students = managerTool.getStudentList();
     }
 
+    public boolean hasStudent() {
+        return !students.isEmpty();
+    }
+
     /**
      * 增添学生。输入的字符串格式应为 [id] [name] ...[subjectName,score]
      * 如： 23333333 Lag English,100 Math,99 History,98
@@ -24,10 +28,14 @@ public class StudentManager {
      */
     public void addStudent(String input) {
         String[] split = input.split(" ");
-
+        try {
             long id = Long.parseLong(split[0]);
             String name = split[1];
 
+            if (managerTool.getStudent(id) != null && managerTool.getStudent(name) != null) {
+                return;
+            }
+
             HashMap<String, Integer> score = new HashMap<>();
             String[] scoreInput;
             for (int i = 2; i < split.length; i++) {
@@ -36,6 +44,10 @@ public class StudentManager {
             }
 
             managerTool.addStudent(id, name, score);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
     }
 
     /**
@@ -43,7 +55,7 @@ public class StudentManager {
      *
      * @param id 学生id，long格式
      */
-    protected void removeStudent(long id) {
+    public void removeStudent(long id) {
         managerTool.removeStudent(id);
     }
 
@@ -52,7 +64,7 @@ public class StudentManager {
      *
      * @param name 学生姓名，long格式
      */
-    protected void removeStudent(String name) {
+    public void removeStudent(String name) {
         managerTool.removeStudent(name);
     }
 
@@ -96,7 +108,7 @@ public class StudentManager {
         HashMap<String, Integer> scores = new HashMap<>();
 
         for (String subject : subjects) {
-            scores.put(subject, getSubjectScore(subject));
+            scores.put(subject, this.getSubjectScore(subject));
         }
 
         return scores;
@@ -112,12 +124,22 @@ public class StudentManager {
         HashMap<String, Float> scores = new HashMap<>();
 
         for (String subject : subjects) {
-            scores.put(subject, getSubjectAvgScore(subject));
+            scores.put(subject, this.getSubjectAvgScore(subject));
         }
 
         return scores;
     }
 
+    /**
+     * 获取某学生总成绩
+     *
+     * @param student 欲获取的学生
+     * @return 该学生所有科目总成绩
+     */
+    public int getStudentGeneralScore(Student student) {
+        return student.getGeneralScore();
+    }
+
     /**
      * 获取所有科目
      *
@@ -132,19 +154,21 @@ public class StudentManager {
      *
      * @return 名次表字符串
      */
-    public String generateRankingTable() {
-        StringBuilder stringBuilder = new StringBuilder("Ranking  |  Name  |  General Score\n");
+    public ArrayList<String> generateRankingTable() {
+        ArrayList<String> rankingTable = new ArrayList<>();
         ArrayList<Student> sortStudentList = managerTool.getSortedStudentList(ManagerTool.SORT_COMPARE_BY_GENERAL_SCORE);
 
         for (int i = 0; i < sortStudentList.size(); i++) {
+            StringBuilder stringBuilder = new StringBuilder();
             stringBuilder
                     .append(i + 1).append("  |  ")
                     .append(sortStudentList.get(i).getName()).append("  |  ")
-                    .append(students.get(i).getGeneralScore())
-                    .append('\n');
+                    .append(students.get(i).getGeneralScore());
+
+            rankingTable.add(stringBuilder.toString());
         }
 
-        return stringBuilder.toString();
+        return rankingTable;
     }
 
     /**
@@ -152,19 +176,15 @@ public class StudentManager {
      *
      * @return 成绩表字符串
      */
-    public String generateScoreTableById() {
-        StringBuilder stringBuilder = new StringBuilder("ID  |  Name  |  General Score  |  Subject1: score Subject2: score ...\n");
+    public ArrayList<String> generateScoreTableById() {
+        ArrayList<String> scoreTable = new ArrayList<>();
         ArrayList<Student> sortStudentList = managerTool.getSortedStudentList(ManagerTool.SORT_COMPARE_BY_ID);
 
         for (Student student : sortStudentList) {
-            stringBuilder
-                    .append(student.getId()).append("  |  ")
-                    .append(student.getName()).append("  |  ")
-                    .append(student.getGeneralScore()).append("  |  ")
-                    .append(listScore(student)).append('\n');
+            scoreTable.add(this.getStudentInfo(student));
         }
 
-        return stringBuilder.toString();
+        return scoreTable;
     }
 
     /**
@@ -172,17 +192,30 @@ public class StudentManager {
      *
      * @return 成绩表字符串
      */
-    public String generateScoreTableByName() {
-        StringBuilder stringBuilder = new StringBuilder("Name  |  Id  |  General Score  |  Subject1: score Subject2: score ...\n");
+    public ArrayList<String> generateScoreTableByName() {
+        ArrayList<String> scoreTable = new ArrayList<>();
         ArrayList<Student> sortStudentList = managerTool.getSortedStudentList(ManagerTool.SORT_COMPARE_BY_NAME);
 
         for (Student student : sortStudentList) {
+            scoreTable.add(this.getStudentInfo(student));
+        }
+
+        return scoreTable;
+    }
+
+    /**
+     * 获取学生信息条目
+     *
+     * @param student 欲获取学生
+     * @return 学生信息
+     */
+    public String getStudentInfo(Student student) {
+        StringBuilder stringBuilder = new StringBuilder();
         stringBuilder
-                    .append(student.getName()).append("  |  ")
                 .append(student.getId()).append("  |  ")
-                    .append(student.getGeneralScore()).append("  |  ")
-                    .append(listScore(student)).append('\n');
-        }
+                .append(student.getName()).append("  |  ")
+                .append(this.getStudentGeneralScore(student)).append("  |  ")
+                .append(listScore(student));
 
         return stringBuilder.toString();
     }
@@ -200,48 +233,83 @@ public class StudentManager {
         for (String subject : subjects) {
             stringBuilder
                     .append(subject).append(": ")
-                    .append(student.getScore().get(subject)).append(' ');
+                    .append(student.getScore().get(subject)).append("  ");
         }
         return stringBuilder.toString();
     }
 
     /**
      * 列出所有科目的成绩信息，包括总分、平均分
+     *
      * @return 信息字符串
      */
-    public String listAllSubjectScore() {
-        StringBuilder stringBuilder = new StringBuilder();
-        ArrayList<String> subjects = getSubjects();
+    public ArrayList<String> generateAllSubjectInfo() {
+        ArrayList<String> subjects = this.getSubjects();
+        ArrayList<String> record = new ArrayList<>();
 
         for (String subject : subjects) {
+            StringBuilder stringBuilder = new StringBuilder();
             stringBuilder
                     .append(subject).append(" | General Score: ")
                     .append(this.getSubjectScore(subject)).append(" | Avg Score: ")
-                    .append(this.getSubjectAvgScore(subject)).append('\n');
+                    .append(this.getSubjectAvgScore(subject));
+            record.add(stringBuilder.toString());
         }
 
-        return stringBuilder.toString();
+        return record;
     }
 
     /**
      * 生成总的学生及科目成绩信息
+     *
      * @return 信息字符串
      */
     public String generateAllInformation() {
         StringBuilder stringBuilder = new StringBuilder();
         stringBuilder
-                .append("------------------------------------")
-                .append("      All Student Information       ")
-                .append("------------------------------------").append('\n')
-                .append(this.generateScoreTableByName()).append('\n')
-                .append("------------------------------------")
-                .append("       All Subject Information      ")
-                .append("------------------------------------").append('\n')
-                .append(this.listAllSubjectScore());
+                .append("------------------------------------\n")
+                .append("      All Student Information       \n")
+                .append("------------------------------------\n");
+
+        ArrayList<String> studentTable = this.generateScoreTableByName();
+        for (String record : studentTable) {
+            stringBuilder.append(record).append('\n');
+        }
+
+        stringBuilder
+                .append("------------------------------------\n")
+                .append("       All Subject Information      \n")
+                .append("------------------------------------\n");
+
+        ArrayList<String> subjectTable = this.generateAllSubjectInfo();
+        for (String record : subjectTable) {
+            stringBuilder.append(record).append('\n');
+        }
 
         return stringBuilder.toString();
     }
 
-}
+    public ArrayList<Student> getStudents() {
+        return students;
+    }
 
+    /**
+     * 通过名字获取学生
+     *
+     * @param name 学生姓名
+     * @return 学生类
+     */
+    public Student getStudent(String name) {
+        return managerTool.getStudent(name);
+    }
 
+    /**
+     * 通过学号获取学生
+     *
+     * @param id 学号
+     * @return 学生类
+     */
+    public Student getStudent(long id) {
+        return managerTool.getStudent(id);
+    }
+}

src/main/java/me/lensfrex/manager/utils/Console.java

@@ -1,5 +1,17 @@
 package me.lensfrex.manager.utils;
 
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+
 public class Console {
 
+    public String getUserInput() {
+        BufferedReader command = new BufferedReader(new InputStreamReader(System.in));
+        try {
+            return command.readLine();
+        } catch (Exception e) {
+            e.printStackTrace();
+            return "null";
+        }
+    }
 }

src/main/java/me/lensfrex/manager/utils/DataLoader.java

@@ -2,10 +2,7 @@ package me.lensfrex.manager.utils;
 
 import me.lensfrex.manager.data.Student;
 
-import java.io.EOFException;
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.ObjectInputStream;
+import java.io.*;
 import java.util.ArrayList;
 
 /**
@@ -20,17 +17,19 @@ public class DataLoader {
      * @return 加载读取的结果，若文件不存在或读取过程中发生错误，则返回一个空的ArrayList
      */
     public ArrayList<Student> load() {
-        File historyFile = new File(DATA_FILE);
+        File file = new File(DATA_FILE);
         try {
-            if (!historyFile.exists()) {
-                historyFile.getParentFile().mkdirs();
-                historyFile.createNewFile();
+            if (!file.exists()) {
+                file.getParentFile().mkdirs();
+                file.createNewFile();
                 return new ArrayList<>();
             }
 
-            ObjectInputStream ois = new ObjectInputStream(new FileInputStream(historyFile));
+            ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file));
+            ArrayList<Student> list =  (ArrayList<Student>) ois.readObject();
             ois.close();
-            return (ArrayList<Student>) ois.readObject();
+
+            return list;
         } catch (EOFException e) {
             System.out.println("Data file is empty.");
             return new ArrayList<>();
@@ -40,4 +39,18 @@ public class DataLoader {
             return new ArrayList<>();
         }
     }
+
+    public void write(ArrayList<Student> studentList) {
+        File file = new File(DATA_FILE);
+        try {
+            if (!file.exists()) {
+                file.createNewFile();
+            }
+            ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file));
+            oos.writeObject(studentList);
+            oos.close();
+        } catch (Exception e) {
+            System.out.println("Error in writing data file:" + e);
+        }
+    }
 }

src/main/java/me/lensfrex/manager/utils/Worker.java

@@ -0,0 +1,150 @@
+package me.lensfrex.manager.utils;
+
+import me.lensfrex.manager.Main;
+import me.lensfrex.manager.data.Student;
+import me.lensfrex.manager.data.manager.StudentManager;
+
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+
+public class Worker {
+
+    public static final String helpMessage = IOUtil.inputStreamToString(Main.class.getResourceAsStream("/me.lensfrex.manager/helpMessage.txt"), StandardCharsets.UTF_8);
+    public static final String studentInformationExample = IOUtil.inputStreamToString(Main.class.getResourceAsStream("/me.lensfrex.manager/studentInformationExample.txt"), StandardCharsets.UTF_8);
+
+    private final StudentManager studentManager = new StudentManager();
+
+    public Worker() {
+        printHelp();
+        if (!studentManager.hasStudent()) {
+            System.out.println("It's seems that there's no any student. Please add at least one student to let the program work properly.");
+        }
+    }
+
+    /**
+     * 打印操作信息
+     */
+    public void printHelp() {
+        System.out.println(helpMessage);
+    }
+
+    /**
+     * 根据用户输入添加学生
+     *
+     * @param userInput 输入的学生信息，格式参见 @studentInformationExample
+     */
+    public void addStudent(String userInput) {
+        studentManager.addStudent(userInput);
+        System.out.println("[System]: Done. (Maybe?)");
+    }
+
+    /**
+     * 按名字删除某个学生
+     *
+     * @param name 学生名字
+     */
+    public void removeStudent(String name) {
+        studentManager.removeStudent(name);
+        System.out.println("[System]: Done. (Maybe?)");
+    }
+
+    /**
+     * 按学号删除某个学生
+     *
+     * @param id 学生学号
+     */
+    public void removeStudent(long id) {
+        studentManager.removeStudent(id);
+        System.out.println("[System]: Done. (Maybe?)");
+    }
+
+    /**
+     * 输出每门课程的总成绩及平均分
+     */
+    public void printAllSubjectInfo() {
+        ArrayList<String> table = studentManager.generateAllSubjectInfo();
+        for (String record : table) {
+            System.out.println(record);
+        }
+    }
+
+    /**
+     * "输出每个学生的学号、姓名、各科考试成绩、总分、平均分，以及每门课程的总分和平均分"
+     */
+    public void listRecord() {
+        System.out.println(studentManager.generateAllInformation());
+    }
+
+    /**
+     * 计算每个学生的总分
+     */
+    public void printAllStudentScoreInfo() {
+        ArrayList<Student> students = studentManager.getStudents();
+
+        System.out.println("- All student general score:");
+        StringBuilder stringBuilder = new StringBuilder();
+        for (Student student : students) {
+            stringBuilder
+                    .append(student.getName()).append(": ")
+                    .append(studentManager.getStudentGeneralScore(student)).append('\n');
+        }
+
+        System.out.println(stringBuilder);
+    }
+
+    /**
+     * 按每个学生的总分由高到低排出名次表
+     */
+    public void printRankingTable() {
+        System.out.println("----------------------------------");
+        System.out.println("Ranking  |  Name  |  General Score");
+        System.out.println("----------------------------------");
+
+        ArrayList<String> table = studentManager.generateRankingTable();
+        for (String record : table) {
+            System.out.println(record);
+        }
+    }
+
+    /**
+     * 按学号由小到大排出成绩表
+     */
+    public void printScoreTableById() {
+        System.out.println("---------------------------------------------------------------------");
+        System.out.println("ID  |  Name  |  General Score  |  Subject1: score Subject2: score ...");
+        System.out.println("---------------------------------------------------------------------");
+
+        ArrayList<String> table = studentManager.generateScoreTableById();
+        for (String record : table) {
+            System.out.println(record);
+        }
+    }
+
+    /**
+     * 按姓名的字典顺序排出成绩表
+     */
+    public void printScoreTableByName() {
+        System.out.println("---------------------------------------------------------------------");
+        System.out.println("ID  |  Name  |  General Score  |  Subject1: score Subject2: score ...");
+        System.out.println("---------------------------------------------------------------------");
+
+        ArrayList<String> table = studentManager.generateScoreTableByName();
+        for (String record : table) {
+            System.out.println(record);
+        }
+    }
+
+    /**
+     * 通过学号查找学生
+     */
+    public String searchById(long id) {
+        return studentManager.getStudentInfo(studentManager.getStudent(id));
+    }
+
+    /**
+     * 通过名字查找学生
+     */
+    public String searchByName(String name) {
+        return studentManager.getStudentInfo(studentManager.getStudent(name));
+    }
+}

src/main/resources/me.lensfrex.manager/helpMessage.txt

@@ -0,0 +1,19 @@
+****************************************************************
+                 Welcome to StudentManager-S
+****************************************************************
+Do you want to:
+    1. Input record
+    2. Remove a student (by name or id)
+    3. Calculate total and average score of every course
+    4. Calculate total and average score of every student
+    5. Sort in descending order by total score of every student
+    6. Sort in ascending order by number
+    7. Sort in ascending order by name
+    8. Search by number
+    9. Search by name
+    10. Statistic analysis for every course (not featured yet)
+    11. List record
+    12. Show help again
+    0. Exit
+****************************************************************
+    Please enter your choice:

src/main/resources/me.lensfrex.manager/studentInformationExample.txt

@@ -1,4 +1,7 @@
 - Please enter the student information following this format:
   [id] [name] ...[subjectName,score]
 - Example:
-  23333333 LagSeeing English,100 Math,99 History,98
+  2333 LagSeeing English,100 Math,99 History,98
+
+- You can enter a student each line
+- Enter ":wq" to finish information recording

src/main/resources/me.lensfrex.manager/welcomeMessage.txt

@@ -1,18 +0,0 @@
-****************************************************************
-                 Welcome to StudentManager-S
-****************************************************************
-Do you want to:
-    1. Input record
-    2. Calculate total and average score of every course
-    3. Calculate total and average score of every student
-    4. Sort in descending order by total score of every student
-    5. Sort in ascending order by number
-    6. Sort in ascending order by name
-    7. Search by number
-    8. Search by name
-    9. Statistic analysis for every course
-    10. List record
-    11. Show help again
-    0. Exit
-****************************************************************
-    Please enter your choice: