java高校学生学籍管理系统

import java.text.DecimalFormat; import java.util.ArrayList; import java.util.List; import java.util.Scanner; public class menu { public static List<Object[]> al = new ArrayList<Object[]>(); public void main() { while (true) { System.out.println("高校学生学籍管理系统首页"); System.out.println("1.添加学生"); System.out.println("2.查看学生信息"); System.out.println("3.修改学生信息"); System.out.println("4.删除学生"); System.out.println("5.统计全部学生总成绩以及排名"); System.out.println("6.统计平均成绩及及格率"); System.out.println("7.退出"); Scanner sc = new Scanner(System.in); String command = sc.nextLine(); switch (command) { case "1" : addStudent(); break; case "2" : viewStudent(); break; case "3" : modStudent(); break; case "4" : deStudent(); break; case "5" : statisticsInfo(); break; case "6" : avgScore(); break; case "7": { System.out.println("谢谢使用！"); System.exit(0); } } } } public void addStudent() { Scanner Scanner = new Scanner(System.in); String name, num, sex, address; int age, grade; System.out.println("添加学生"); System.out.println("请输入学生信息："); System.out.println("姓名："); name = Scanner.nextLine(); System.out.println("学号："); num = Scanner.nextLine(); System.out.println("性别："); sex = Scanner.nextLine(); if(!sex.equals("女") && !sex.equals("男") ){ System.out.println("性别输入错误！请重新输入"); return; } System.out.println("班级："); address = Scanner.nextLine(); System.out.println("年龄："); age = Scanner.nextInt(); System.out.println("成绩："); grade = Scanner.nextInt(); Object[] student = new Object[6]; student[0] = name; student[1] = num; student[2] = sex; student[3] = address; student[4] = age; student[5] = grade; al.add(student); System.out.println("学生信息添加成功"); } public void viewStudent() { Scanner Scanner = new Scanner(System.in); int sid; String massage; boolean ismatched = false; System.out.println("操作：查找学生"); System.out.println("请输入学号："); sid = Scanner.nextInt(); for (int i = 0; i < al.size(); i++) { Object[] student = (Object[]) al.get(i); if (Integer.parseInt(student[1].toString()) == sid) { ismatched = true; System.out.println("确认查询" + String.valueOf(student[0]) + "学籍？(y/n)"); if (Scanner.next().equals("y")) { // 打印修改后的学生学籍信息 massage = "姓名：" + String.valueOf(student[0]) + " 学号：" + String.valueOf(student[1]) + " 性别：" + String.valueOf(student[2]) + " 班级：" + String.valueOf(student[3]) + " 年龄：" + String.valueOf(student[4]) + " 成绩：" + String.valueOf(student[5]); System.out.println("学生信息查询成功！"); System.out.println(massage); } else { System.out.println("查询操作已取消！"); } break; } } if (ismatched == false) { System.out.println("学号不存在！请确认输入是否无误！"); } } public void modStudent() { Scanner Scanner = new Scanner(System.in); String name,num,sex,address; int age,grade,sid; String massage; boolean ismatched = false; System.out.println("操作：修改学生"); System.out.println("请输入学号："); sid = Scanner.nextInt(); // 匹配学生学号 for (int i = 0; i < al.size(); i++) { Object[] student = (Object[]) al.get(i); if (Integer.parseInt(student[1].toString()) == sid) { ismatched = true; System.out.println("确认修改" + String.valueOf(student[0]) + "学籍？(y/n)"); if (Scanner.next().equals("y")){ System.out.println("请输入学生信息："); System.out.println("姓名："); name = Scanner.next(); student[0] = name; System.out.println("学号："); num = Scanner.next(); student[1] = num; System.out.println("性别："); sex = Scanner.next(); student[2] = sex; System.out.println("班级："); address = Scanner.next(); student[3] = address; System.out.println("年龄："); age = Scanner.nextInt(); student[4] = age; System.out.println("成绩："); grade = Scanner.nextInt(); student[5] = grade; massage = "姓名：" + String.valueOf(student[0]) + " 学号：" + String.valueOf(student[1]) + " 性别：" + String.valueOf(student[2]) + " 班级：" + String.valueOf(student[3]) + " 年龄：" + String.valueOf(student[4]) + " 成绩：" + String.valueOf(student[5]); al.set(i, student); System.out.println("学生信息修改成功！"); System.out.println(massage); } else { System.out.println("删除操作已取消！"); } break; } } if (ismatched == false) { System.out.println("学号不存在！请确认输入是否无误！"); } } public void deStudent() { Scanner Scanner = new Scanner(System.in); int sid; boolean ismatched = false; System.out.println("删除学生"); System.out.println("请输入学号"); sid = Scanner.nextInt(); for (int i = 0; i < al.size(); i++) { Object[] student = (Object[]) al.get(i); if (Integer.parseInt(student[1].toString()) == sid) { ismatched = true; System.out.println("确认删除" + String.valueOf(student[0]) + "学籍?(y/n"); if (Scanner.next().equals("y")) ; if (Scanner.next().equals("y")) { al.remove(i); System.out.println("学生信息删除成功！"); } else { System.out.println("删除操作已取消！"); } break; } } if (ismatched == false) { System.out.println("该学号不存在！请确认输入是否无误！"); } } public void statisticsInfo() { int totalGarde = 0; for (int i = 0; i < al.size(); i++) { Object[] student = (Object[]) al.get(i); String grade = String.valueOf(student[5]); totalGarde = totalGarde + Integer.parseInt(grade); } System.out.println("全部学生的总成绩为：" + totalGarde);