新增方法：

- 删除一个学生
- 列出所有科目的成绩信息
- 生成总的学生及科目成绩信息

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

@@ -1,6 +1,7 @@
 package me.lensfrex.manager.data.manager;
 
 import me.lensfrex.manager.data.Student;
+import me.lensfrex.manager.utils.DataLoader;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -12,8 +13,12 @@ import java.util.Map;
 public class ManagerTool {
     private final ArrayList<Student> students;
 
-    protected ManagerTool(ArrayList<Student> studentData) {
+    protected ManagerTool() {
-        this.students = studentData;
+        this.students = new DataLoader().load();
+    }
+
+    public ArrayList<Student> getStudentList() {
+        return students;
     }
 
     /**

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

@@ -9,8 +9,12 @@ import java.util.HashMap;
  * 对Student类的操作的上层封装，有较为多的操作
  */
 public class StudentManager {
-    private final ArrayList<Student> students = new ArrayList<>();
+    private final ArrayList<Student> students;
-    private final ManagerTool managerTool = new ManagerTool(students);
+    private final ManagerTool managerTool = new ManagerTool();
+
+    public StudentManager() {
+        this.students = managerTool.getStudentList();
+    }
 
     /**
      * 增添学生。输入的字符串格式应为 [id] [name] ...[subjectName,score]
@@ -34,6 +38,23 @@ public class StudentManager {
         managerTool.addStudent(id, name, score);
     }
 
+    /**
+     * 删除一个学生（按ID）
+     *
+     * @param id 学生id，long格式
+     */
+    protected void removeStudent(long id) {
+        managerTool.removeStudent(id);
+    }
+
+    /**
+     * 删除一个学生（按姓名）
+     *
+     * @param name 学生姓名，long格式
+     */
+    protected void removeStudent(String name) {
+        managerTool.removeStudent(name);
+    }
 
     // 要是Java能像go语言那样返回两个返回值就好了...
     // 这样就能同时返回平均值和总值了...
@@ -98,7 +119,8 @@ public class StudentManager {
     }
 
     /**
-     *  获取所有科目
+     * 获取所有科目
+     *
      * @return 包含有科目名称的ArrayList
      */
     public ArrayList<String> getSubjects() {
@@ -173,7 +195,7 @@ public class StudentManager {
      */
     private String listScore(Student student) {
         StringBuilder stringBuilder = new StringBuilder();
-        ArrayList<String> subjects = managerTool.getAllSubjects();
+        ArrayList<String> subjects = getSubjects();
 
         for (String subject : subjects) {
             stringBuilder
@@ -183,4 +205,43 @@ public class StudentManager {
         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();
+
+        for (String subject : subjects) {
+            stringBuilder
+                    .append(subject).append(" | General Score: ")
+                    .append(this.getSubjectScore(subject)).append(" | Avg Score: ")
+                    .append(this.getSubjectAvgScore(subject)).append('\n');
+        }
+
+        return stringBuilder.toString();
+    }
+
+    /**
+     * 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());
+
+        return stringBuilder.toString();
+    }
+
 }
+
+