Java使用者名稱登入學生資訊管理系統並對其進行增刪改查操作，恒昌登入系統使用者名稱

Java使用者名稱登入學生資訊管理系統並對其進行增刪改查操作，恒昌登入系統使用者名稱

package zzzzzzzz;import java.io.*;public class Text {public static void main(String[] args) throws MyException, IOException {Login l=new Login();l.login();}}class Student{private String stunumber;private String name;private String age;private String sex;private String score;public void set_stunumber(String stu){stunumber=stu;}public String get_stunumber(){return stunumber;}void set_name(String na){name=na;}String get_name(){return name;}void set_age(String agee){age=agee;}String get_age(){return age;}void set_sex(String sexx){sex=sexx;}String get_sex(){return sex;}void set_score(String scoree){score=scoree;}String get_score(){return score;}}class StudentManager{int n=0;Student ss[]=new Student[50];//遍曆學生資訊void showStudent(){for(int i=0;i<=n;i++){System.out.println("學號："+ss[i].get_stunumber()+"姓名："+ss[i].get_name()+"年齡："+ss[i].get_age()+"性別："+ss[i].get_sex()+"分數："+ss[i].get_score()+"\t\n");}}//判斷學號是否已經存在     boolean panduan(String st)    {        boolean flag=true;            for(int i=0;i<n;i++)        {            if(ss[i].get_stunumber().equals(st))                flag= false;            else                 flag= true;        }        return flag;    }         //新增學生資訊void addStudent(String stunumber,String name,String age,String b,String score){ss[n]=new Student();ss[n].set_stunumber(stunumber);ss[n].set_name(name);ss[n].set_age(age);ss[n].set_sex(b);ss[n].set_score(score);n++;}//刪除學生資訊void deleteStudent(String stunumber) throws MyException{for(int i=0;i<=n;i++){if(ss[i].get_stunumber().equals(stunumber)){System.out.println("學號為："+stunumber+"的學生已被刪除！");if(n==1){System.out.println("數組為空白");ss[0]=new Student();}else {for(int j=i;j<=n;j++){ss[j]=ss[j+1];}n--;}}else{throw new MyException("該學生不存在！");}}}//修改學生資訊void updateStudent(String stu1,String name,String age,String sex,String score) throws MyException{for(int i=0;i<=n;i++){if(ss[i].get_stunumber().equals(stu1)){ss[i]=new Student();ss[i].set_stunumber(stu1);ss[i].set_name(name);ss[i].set_age(age);ss[i].set_sex(sex);ss[i].set_score(score);}else throw new MyException("沒有找到該學生！");}}//查詢學生資訊void selectStudent(String number) throws MyException{for(int i=0;i<=n;i++){if(ss[i].get_stunumber().equals(number)){System.out.println("學號："+ss[i].get_stunumber()+"姓名："+ss[i].get_name()+"年齡："+ss[i].get_age()+"性別："+ss[i].get_sex()+"分數："+ss[i].get_score()+"\t\n");}else throw new MyException("沒有找到該學生！");}}//統計不及格的人數void tongji(){int s=0;for(int i=0;i<=n;i++){int a=Integer.parseInt(ss[i].get_score());if(a<=60){s=s+1;System.out.println("學號："+ss[i].get_stunumber()+"姓名："+ss[i].get_name()+"年齡："+ss[i].get_age()+"性別："+ss[i].get_sex()+"分數："+ss[i].get_score()+"\t\n");}}System.out.println("不及格的人數為："+s+"人");}//輸入介面void showface(){System.out.println("*****************************");System.out.println("石家莊鐵道大學學生資訊管理系統");System.out.println("*****************************");System.out.println("1.遍曆輸出學生資訊");System.out.println("2.新學生資訊錄入");System.out.println("3.刪除學生資訊");System.out.println("4.修改學生資訊");System.out.println("5.查詢學生資訊");System.out.println("6.學生資訊統計");System.out.println("7退出.");}}class Login{User users=new User("001","123456");//使用者名稱，密碼//登入void login() throws MyException, IOException{BufferedReader in=new BufferedReader(new InputStreamReader(System.in));DataOutputStream out=new DataOutputStream(new BufferedOutputStream(new FileOutputStream("Student.txt",true)));for(int i=1;i<=3;i++){System.out.println("請輸入使用者ID：");String id=in.readLine();System.out.println("請輸入密碼：");String pass=in.readLine();if((users.uername.equals(id))&&(users.passage.equals(pass))){StudentManager sm=new StudentManager();while(true){sm.showface();System.out.println("請選擇：");String choose=in.readLine();if(choose.startsWith("1")){sm.showStudent();}else if(choose.startsWith("2")){System.out.print("請輸入學號：");String stu=in.readLine();System.out.print("請輸入姓名：");String name=in.readLine();System.out.print("請輸入年齡：");String age=in.readLine();System.out.println("請輸入性別（true男，false女）：");String sex=in.readLine();System.out.print("請輸入分數：");String score=in.readLine();if(sm.panduan(stu)){sm.addStudent(stu, name, age, sex, score);System.out.println("建立成功！");out.writeUTF("|學號："+stu+"|姓名："+name+"|年齡："+age+"|性別："+sex+"|分數："+score+"|\t\t\n\n");}elsethrow new MyException("該學生已存在，請勿重複添加");}else if(choose.startsWith("3")){System.out.println("請輸入學號：");String stu=in.readLine();if(!(sm.panduan(stu))){sm.deleteStudent(stu);}else throw new MyException("該學號不存在！");}else if(choose.startsWith("4")){System.out.println("請輸入學號：");String stu=in.readLine();System.out.println("請輸入姓名：");String name=in.readLine();System.out.println("請輸入年齡：");String age=in.readLine();System.out.print("請輸入性別（true男，false女）：");String sex=in.readLine();System.out.print("請輸入分數：");String score=in.readLine();if(!(sm.panduan(stu))){sm.updateStudent(stu, name, age, sex, score);out.writeUTF("|學號："+stu+"|姓名："+name+"|年齡："+age+"|性別："+sex+"|分數："+score+"|\t\n");}else throw new MyException("該學號不存在！");}else if(choose.startsWith("5")){System.out.println("請輸入學號：");String stu=in.readLine();if(!(sm.panduan(stu))){sm.selectStudent(stu);}else throw new MyException("該學號不存在！");}else if(choose.startsWith("6")){sm.tongji();}else if(choose.startsWith("7")){    in.close();out.close();System.exit(0);   }else {throw new MyException("選擇錯誤，請重新選擇");}}}elseSystem.out.println("使用者ID或密碼錯誤，請重新輸入");}   throw new MyException("該卡鎖定！");}}class User{String uername;String passage;User(String user,String pass){this.uername=user;this.passage=pass;}void set_uername(String use){uername=use;}String get_uername(){return uername;}void set_passage(String pass){passage=pass;}String get_passage(){return passage;}}class MyException extends Exception{public MyException(String e) {super(e);}}