How to realize the Student Information Management system with java

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JAVA简单写学生信息管理系统，实现学生信息的输入、查询、修改、删除操作

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