学生管理系统，实现学生的增删改查

来源：互联网发布：centos 7 卡在进度条编辑：程序博客网时间：2024/06/09 17:31
先建立一个学生类：
package com.inherit;public class Student {    String name;    String studentId;    String gender;    int grade;    public Student(String name,String studentId,String gender,int grade){        this.name= name;        this.studentId= studentId;        this.gender = gender;        this.grade = grade;        }    public int getGrade(){        return grade;    }    public String getName(){        return name;    }    public String getgender(){        return gender;    }    public void setGrade(int g){        this.grade = g;    }    public String getStudentId(){        return studentId;    }    public static void choice() {        // TODO Auto-generated method stub    }}建立测试类：package com.inherit;import java.io.ObjectInputStream.GetField;import java.util.*;/** *  * @author 张泽 * */public class TestStudent {    static List<Student> StudentList = new LinkedList<Student>();    public static void main(String[] agrs){        System.out.println("***************");        System.out.println("*欢迎来到学生管理系统 *");        String password = "562300";        System.out.println("请输入密码：");        Scanner sm = new Scanner(System.in);        String password1 = sm.nextLine();        if(password1.equals(password)){                    Menu();            }else{        System.out.println("你输入的密码错误！请重新运行！");    }    }    private static void Menu(){        System.out.println("1：增加学生    2：删除学生     3：修改成绩     4：查询成绩      5：显示全部学生     6：退出 ");        System.out.println("您想选择的操作是：");        Scanner ss = new Scanner(System.in);        int choice = ss.nextInt();                switch(choice){        //增加学生        case 1:            System.out.print("请输入学生的姓名：");            Scanner Sname = new Scanner(System.in);            String name = Sname.nextLine();            System.out.print("请输入学生的性别：");            Scanner Ssex = new Scanner(System.in);            String gender = Ssex.nextLine();            System.out.print("请输入学生的学号：");            Scanner SId = new Scanner(System.in);            String studentId = SId.nextLine();            System.out.print("请输入学生的成绩：");            Scanner Sgrade = new Scanner(System.in);            int grade = Sgrade.nextInt();            StudentList.add(new Student(name,studentId,gender,grade));            System.out.println(" 学生个数有："+StudentList.size());            System.out.println("添加成功！！！！！");            Menu();          break;        //删除学生成绩        case 2:            System.out.print("请告诉我需要删除学生的学号：");            Scanner Sid = new Scanner(System.in);            String SstudentId = Sid.nextLine();            boolean isfindDelete = false;            for (int i = 0; i < StudentList.size(); i++) {                if(SstudentId.equals(StudentList.get(i).getStudentId())){                    System.out.println("发现了该学生，正在删除...");                    StudentList.remove(i);                    System.out.println("删除成功!!!");                    isfindDelete =true;                }            }            if(!isfindDelete){                System.out.println("抱歉，没有找到");            }            Menu();            break;        //修改学生成绩        case 3:            System.out.print("请告诉我需要修改成绩学生的学号：");            Scanner GId = new Scanner(System.in);            String GstudentId = GId.nextLine();            boolean isfindChange = false;            for (int j = 0; j < StudentList.size(); j++) {                if(GstudentId.equals(StudentList.get(j).getStudentId())){                    System.out.println("发现了该学生，正在修改...");                    System.out.println("学生原成绩为"+StudentList.get(j).getGrade());                    System.out.print("请输入修改后学生的成绩：");                    Scanner Ggrade = new Scanner(System.in);                    int grade2 = Ggrade.nextInt();                    StudentList.get(j).setGrade(grade2);                    System.out.println("修改成功!!!");                    isfindChange =true;                }else{                }            }            if(!isfindChange){                System.out.println("抱歉，没有找到");            }            Menu();            break;        //查看学生成绩        case 4:            System.out.print("请告诉我需要查询学生的学号：");            Scanner CId = new Scanner(System.in);            String CstudentId = CId.nextLine();            boolean isfindData = false;            for (int i = 0; i < StudentList.size(); i++) {                if(CstudentId.equals(StudentList.get(i).getStudentId())){                    System.out.println("姓名\t"+"性别\t"+"学号\t"+"成绩\t");                    System.out.println(StudentList.get(i).getName()+"\t"+StudentList.get(i).getgender()+"\t"+StudentList.get(i).getStudentId()+"\t"+StudentList.get(i).getGrade());                    isfindData = true;                }            }            if(!isfindData){            System.out.println("抱歉，没有找到");            }            Menu();            break;        default:            System.out.println("您输入的数字有误，请重新输入：");            break;            //显示全部学生        case 5:            System.out.println("名册里有学生："+StudentList.size());            System.out.println("学生\t"+"性别\t"+"学号\t"+"年龄\t");            for (int i = 0; i < StudentList.size(); i++) {                Student s = StudentList.get(i);                System.out.println(s.getName()+"\t"+s.getgender()+"\t"+s.getStudentId()+"\t"+s.getGrade()+"\t");            }            Menu();            break;          //退出        case 6:            System.out.println("谢谢使用，再见！");            System.exit(choice);            }        }    }
3 0