学生信息处理平台（类的格式）

package com.njwb.lei; import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); StudentManager manager = new StudentManager(100); while (true) { System.out.println("\n======= 学生信息录入系统 ======="); System.out.println("1. 添加学生信息"); System.out.println("2. 修改学生信息"); System.out.println("3. 删除学生信息"); System.out.println("4. 查询所有学生信息"); System.out.println("5. 根据学号查询学生信息"); System.out.println("6. 根据姓名查询学生信息"); System.out.println("7. 根据成绩从高到低排序"); System.out.println("8. 退出系统"); System.out.print("请输入操作编号："); int choice = sc.nextInt(); switch (choice) { case 1: System.out.print("请输入学号："); int no = sc.nextInt(); System.out.print("请输入姓名："); String name = sc.next(); System.out.print("请输入成绩："); double score = sc.nextDouble(); if (manager.addStudent(no, name, score)) { System.out.println("添加成功！"); } else { System.out.println("学号重复，添加失败！"); } break; case 2: System.out.print("请输入要修改的学号："); int modNo = sc.nextInt(); System.out.print("请输入新姓名："); String newName = sc.next(); System.out.print("请输入新成绩："); double newScore = sc.nextDouble(); if (manager.updateStudent(modNo, newName, newScore)) { System.out.println("修改成功！"); } else { System.out.println("查无此学号！"); } break; case 3: System.out.print("请输入要删除的学号："); int delNo = sc.nextInt(); if (manager.deleteStudent(delNo)) { System.out.println("删除成功！"); } else { System.out.println("查无此学号！"); } break; case 4: manager.showAll(); break; case 5: System.out.print("请输入要查询的学号："); int searchNo = sc.nextInt(); Student s = manager.searchByNo(searchNo); if (s != null) { System.out.println(s); } else { System.out.println("查无此人！"); } break; case 6: System.out.print("请输入要查询的姓名："); String searchName = sc.next(); manager.searchByName(searchName); break; case 7: manager.sortByScoreDesc(); break; case 8: System.out.println("系统退出！"); return; default: System.out.println("无效操作！"); } } } }