java实现学生信息管理系统

package Week;

import jdk.internal.util.xml.impl.Input;

import java.util.HashSet;
import java.util.Scanner;

public class StudentMs {
 Scanner sc = new Scanner(System.in);
 public int getID() {
  return ID;
 }

 public String getName() {
  return name;
 }

 public String getClassnum() {
  return classnum;
 }

 public int getTelephone() {
  return telephone;
 }

 public void setID(int ID) {
  this.ID = ID;
 }

 public void setName(String name) {
  this.name = name;
 }

 public void setClassnum(String classnum) {
  this.classnum = classnum;
 }

 public void setTelephone(int telephone) {
  this.telephone = telephone;
 }
 private int ID;
 private String name;
 private String classnum;
 private int telephone;

 /* public StudentMs(int ID, String name, String classnum, String telephone) {
  this.ID = ID;
  this.name = name;
  this.classnum = classnum;
  this.telephone = telephone;
 }*/

 public void add(StudentMs a){
  int ID1;
  String name2;
  String classnum1;
  int telephone1;
   System.out.println("请输入你要添加的学生信息");
   System.out.println("请输出学生学号");
   ID1 =sc.nextInt();
   a.setID(ID1);
   System.out.println("请输出学生姓名");
   sc.nextLine();
   name2=sc.nextLine();
   a.setName(name2);
   System.out.println("请输出学生班级");
   classnum1=sc.nextLine();
   a.setClassnum(classnum1);
   System.out.println("请输出学生电话号码");
   telephone1=sc.nextInt();
   a.setTelephone(telephone1);
 }
 public int find(String[][] a)
 {
  System.out.println("请输入你要查询学生的学号");
  int n=-1;
  int id = sc.nextInt();
  for(int i=0;i<a.length;i++)
  {
   if(Integer.parseInt(a[i][0]) == id)
   {
    n=i;
    break;
   }
  }
  return n;
 }
 public int delay(String[][] a)
 {
  System.out.println("请输入你要删除学生的学号！");
  int id;
  int n=-1;
  id= sc.nextInt();
  for(int i=0;i<a.length;i++)
  {
   if(Integer.parseInt(a[i][0])==id)
   {
    n=i;
    break;
   }
  }
  return n;
 }
 public int print(String[][] a)
 {
  System.out.println("请输入你要打印的学生信息的学生学号！");
  int id;
  int n=-1;
  id = sc.nextInt();
  for(int i=0;i<a.length;i++)
  {
   if(Integer.parseInt(a[i][0]) == id)
   {
    n=i;
    break;
   }
  }
  return n;
 }
 public int recivice(String[][] a)
 {
  System.out.println("请输入你要修改的学生信息的学生学号！");
  int id;
  int n=-1;
  id = sc.nextInt();
  for(int i=0;i<a.length;i++)
  {
   if(Integer.parseInt(a[i][0]) == id)
   {
    n=i;
    break;
   }
  }
  return n;
 }
 public int Num(){//用来查找修改图书信息的下标
  System.out.println("选择你要修改的内容：0.学号 1.姓名 2.班级 3.电话");
  int n=sc.nextInt();
  return n;
 }
 public void display()
 {
  System.out.println("***************************************");
  System.out.println("****  高校学习信息管理系统  *****");
  System.out.println("****  1：添加学生信息   ****");
  System.out.println("****  2：查询学生信息   ****");
  System.out.println("****  3：修改学生信息   ****");
  System.out.println("****  4：删除学生信息   ****");
  System.out.println("****  5：打印学生信息   ****");
  System.out.println("****  6：退出     ****");
  System.out.println("**** 请输入您要进行的操作（1-6） ***");
 }
 public static void main(String[] args) {
  Scanner sc = new Scanner(System.in);
  StudentMs studentMs = new StudentMs();
  boolean flat = true;
  HashSet a = new HashSet();
  String[][] student=new String[4][10];
  int num=0;
  int number;
  int m,n;
  while (flat)
  {
   studentMs.display();
   number=sc.nextInt();
   switch (number)
   {
    case 1:
    {
     studentMs.add(studentMs);
     student[num][0]=studentMs.ID+"";
     student[num][1]=studentMs.name+"";
     student[num][2]=studentMs.classnum+"";
     student[num][3]=studentMs.telephone+"";
     num++;

     break;
    }
    case 2:
    {
     m=studentMs.find(student);
     if(m>=0){
      System.out.println("学生学号为："+student[m][0]);
      System.out.println("学生姓名为："+student[m][1]);
      System.out.println("学生班级为："+student[m][2]);
      System.out.println("学生电话为："+student[m][3]);
     }else{
      System.out.println("学号错误,未找到学生");
      break;
     }
     break;
    }
    case 3:
    {
     m=studentMs.recivice(student);
     n=studentMs.Num();
     System.out.println("请输入你要修改的内容：");
     student[m][n]=sc.next();
     System.out.println("修改成功！");
     break;
    }
    case 4:
    {
     m=studentMs.delay(student);
     for(int i=0;i<4;i++)
     {
      student[m][i]=null;
     }
     System.out.println("已经成功删除学生信息");
     break;
    }
    case 5:
    {
     m=studentMs.delay(student);
     System.out.println("学号"+student[m][0]+"的学生信息为：");
     System.out.println("学生学号为："+student[m][0]);
     System.out.println("学生姓名为："+student[m][1]);
     System.out.println("学生班级为："+student[m][2]);
     System.out.println("学生电话为："+student[m][3]);
     break;
    }
    case 6:
    {
     System.out.println("程序退出！");
     flat=false;
     break;
    }
   }
  }
 }
}