studentManageV2.0.zip

import java.io.IOException; import java.util.Collection; import java.util.HashMap; import java.util.Map; import java.util.Scanner; public class Manage { //存储学生容器 public static Map<String, Student> studentIco = new HashMap<>(); //接收屏幕上输入的内容 public static Scanner scanner = new Scanner(System.in); /** * 菜单 * * @return */ public static String menu() { System.out.println(" 1、添加学生"); System.out.println(" 2、修改学生"); System.out.println(" 3、删除学生"); System.out.println(" 4、查询学生"); System.out.println(" 5、退出"); System.out.println("请输入菜单id："); //开关，用于判断输入是否正确 boolean switcha = true; //接收选择的菜单， String menuIndex; //region 数据校验 do { menuIndex = scanner.next(); if (CheckUtil.checkIsIntNumber(menuIndex)) { if ("12345".contains(menuIndex)) { switcha = false; break; } } System.out.println("输入菜单id有误，请重新输入："); } while (switcha); //endregion return menuIndex; } /** * 添加学生 */ public static boolean addStudent() { //获取输入的学生信息 System.out.println("请输入学生学号:"); String studentNum = scanner.next(); //数据校验 while (studentIco.get(studentNum) != null) { System.out.println("学号重复，请重新输入学号："); studentNum = scanner.next(); } System.out.println("请输入学生姓名:"); String studentName = scanner.next(); System.out.println("请输入学生语文成绩:"); String studentChinese = scanner.next(); //数据校验 while (!CheckUtil.checkIsDoubleNumber(studentChinese)) { System.out.println("语文成绩输入错误，请重新输入："); studentChinese = scanner.next(); } System.out.println("请输入学生数学成绩:"); String studentMath = scanner.next(); //数据校验 while (!CheckUtil.checkIsDoubleNumber(studentMath)) { System.out.println("数学成绩输入错误，请重新输入："); studentMath = scanner.next(); } System.out.println("请输入学生英语成绩:"); String studentEnglinsh = scanner.next(); //数据校验 while (!CheckUtil.checkIsDoubleNumber(studentEnglinsh)) { System.out.println("英语成绩输入错误，请重新输入："); studentEnglinsh = scanner.next(); } //创建学生对象 Student student = new Student(); student.num = studentNum; student.name = studentName; student.chineseAch = Double.valueOf(studentChinese); student.mathAch = Double.valueOf(studentMath); student.englishAch = Double.valueOf(studentEnglinsh); //存储 studentIco.put(studentNum, student); return true; } /** * 修改学生 */ public static boolean editStudent() { //学生原始信息 Student student=null; //获取输入的学生信息 System.out.println("请输入需要修改的学生学号:"); String studentNum = scanner.next(); //数据校验 while ((student = studentIco.get(studentNum)) == null) { System.out.println("学号不存在，请重新输入学号（输入q退出）："); studentNum = scanner.next(); if ("q".equals(studentNum)) { return false; } } System.out.println("请输入学生姓名（输入n不修改）:"); String studentName = scanner.next(); if ("n".equals(studentName)) { studentName = student.name; } System.out.println("请输入学生语文成绩(输入n不修改）:"); String studentChinese = scanner.next(); while (true) { if ("n".equals(studentChinese)) { studentChinese = String.valueOf(student.chineseAch); break; } //数据校验 if (!CheckUtil.checkIsDoubleNumber(studentChinese)) { System.out.println("语文成绩输入错误，请重新输入："); studentChinese = scanner.next(); }else{ break; } } System.out.println("请输入学生数学成绩(输入n不修改）:"); String studentMath = scanner.next(); while (true) { if ("n".equals(studentMath)) { studentMath = String.valueOf(student.mathAch); break; } //数据校验 if (!CheckUtil.checkIsDoubleNumber(studentMath)) { System.out.println("数学成绩输入错误，请重新输入："); studentMath = scanner.next(); }else{ break; } } System.out.println("请输入学生英语成绩(输入n不修改）:"); String studentEnglinsh = scanner.next(); while (true) { if ("n".equals(studentEnglinsh)) { studentEnglinsh = String.valueOf(student.englishAch); break; } //数据校验 if (!CheckUtil.checkIsDoubleNumber(studentEnglinsh)) { System.out.println("英语成绩输入错误，请重新输入："); studentEnglinsh = scanner.next(); }else{ break; } } //修改学生信息 student.name = studentName; student.chineseAch = Double.valueOf(studentChinese); student.mathAch = Double.valueOf(studentMath); student.englishAch = Double.valueOf(studentEnglinsh); studentIco.put(student.num, student); return true; } /** * 删除学生 */ public static boolean delStudent() { System.out.println("请输入需要修改的学生学号:"); String studentNum = scanner.next(); //数据校验 while (studentIco.get(studentNum) == null) { System.out.println("学号不存在，请重新输入学号（输入q退出）："); studentNum = scanner.next(); if ("q".equals(studentNum)) { return false; } } studentIco.remove(studentNum); return true; } /** * 查询所有学生 */ public static boolean selectStudent() { System.out.println("学号 姓名 语文成绩 数学成绩 英语成绩"); Collection<Student> students = studentIco.values(); for (Student student : students) { System.out.printf("%s %s %s %s %s", student.num, student.name, student.chineseAch, student.mathAch, student.englishAch); System.out.println(); } return true; } /** * 登录 * * @return */ public static boolean login() throws IOException { System.out.println("请输入用户名："); String username = scanner.next(); System.out.println("请输入密码："); String password = scanner.next(); //写死用户名密码均为root if (!("root".equals(username) && "root".equals(password))) { System.out.println("用户名密码错误"); return false; } return