java 简单的学生信息管理 不涉及sql,该如何解决

package group7.list;import java.util.*;public class Student {        private String sID ;    private String sName ;    private String sGender ;    private int sAge ;        Scanner cin = new Scanner(System.in);        public Student(){};        public Student(String sID, String sName,String gender, int age ){        this.setsName(sName);        this.setsGender(gender);        this.setsAge(age);    }        public void setsID(String sID) {        this.sID = sID;    }    public String getsID() {        return sID;    }    public void setsName(String sName) {        this.sName = sName;    }    public String getsName() {        return sName;    }    public void setsGender(String sGender) {        this.sGender = sGender;    }    public String getsGender() {        return sGender;    }    public void setsAge(int sAge) {        this.sAge = sAge;    }    public int getsAge() {        return sAge;    }        public void addStudent(){                Student s1=new Student();        System.out.println("请输入学生学号：");        String ID=cin.nextLine();        s1.setsID(ID);        System.out.println("请输入学生姓名：");        String name=cin.nextLine();        s1.setsName(name);        System.out.println("请输入学生性别：");        String gender=cin.nextLine();        s1.setsGender(gender);        System.out.println("请输入学生年龄：");        int age=cin.nextInt();        s1.setsAge(age);                StudentList s=new StudentList();        s.addStudent(s1);    }        public void deleteStudent(){                System.out.println("请输入需要删除的学生的学号：");        String deleteID=cin.nextLine();        int index=Integer.parseInt(deleteID);                StudentList s=new StudentList();        s.removeStudent(index);            }}

package group7.list;import java.util.ArrayList;import java.util.Iterator;public class StudentList {        ArrayList<Student> stuList=new ArrayList<Student>();        public StudentList(){}        public StudentList(Student student){                stuList.add(student);    }        public void addStudent( Student student){                stuList.add(student);                };        public void removeStudent(int index){                stuList.remove(index);            };        public void showStudents(){                Iterator<Student> it= stuList.iterator();                while(it.hasNext()){            System.out.println(it.next()+" ");        }            };}

package group7.list;import java.util.*;public class StudentListTest {    /**     * 2、    使用List管理对象集合         1)    新建一个包group_x.list(x表示所在的组号)         2)    在这个包中新建三个类：Student类，StudentList类，StudentListTest类。            Student类主要包括：          3)    完善上面三个类，相关要求参考源代码程序的注释，即根据要求修改源代码程序，给出具体的实现代码。     *@author      * @param args     */        public static void main(String[] args) {                        Scanner cin=new Scanner(System.in);                        Student stu0 = new Student("001","Jack","M",20);        Student stu1 = new Student("002","Mike","M",20);        Student stu2 = new Student("003","Lisa","F",20);        Student stu3 = new Student("004","Linda","F",20);        Student stu4 = new Student("005","Harry","M",20);        Student stu5 = new Student("006","Jimmy","M",20);                            StudentList s10=new StudentList(stu0);        StudentList s11=new StudentList(stu1);        StudentList s12=new StudentList(stu2);        StudentList s13=new StudentList(stu3);        StudentList s14=new StudentList(stu4);        StudentList s15=new StudentList(stu5);                StudentListTest s= new StudentListTest();        s.menu();                int choice=cin.nextInt();                switch(choice){                case 1 : {                    boolean flag=true;                        while(flag)            {                Student s1=new Student();                s1.addStudent();                System.out.println("如果想要继续添加请输入y，否则输入n");                String c=cin.next();                if(c=="y") flag=true;                else flag=false;                            }                        StudentListTest s5=new StudentListTest();            s5.menu();        };                break;                case 2 :{                        boolean flag=true;                        while(flag){            Student s1=new Student();            s1.deleteStudent();            System.out.println("如果想要继续删除请输入y，否则输入n");            String c=cin.next();            if(c=="y") flag=true;            else flag=false;            }                        StudentListTest s6=new StudentListTest();            s6.menu();                    };                break;                case 3 :{                        StudentList s2=new StudentList();            s2.showStudents();                        StudentListTest s7=new StudentListTest();            s7.menu();                    };                break;                case 4 :{            StudentListTest s8=new StudentListTest();            s8.menu();        };        break;                }    }    private void menu() {                System.out.println("<<<请选择你需要的操作>>>");        System.out.println("|   1、添加学生信息        |");        System.out.println("|   2、删除学生信息        |");        System.out.println("|   3、显示学生信息        |");        System.out.println("|   4、退出                            |");        System.out.println("************************");            }}