Java Student Information Management system and support user name login

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Package Zzzzzzzz;import java.io.*;p ublic class Text {public static void main (string[] args) throws MyException, Ioexceptio n {Login l=new login (); L.login ();}} Class Student{private string Stunumber;private string name;private string age;private string Sex;private string score;pub LIC 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];//traverse student information void Showstudent () {for (int i=0;i<=n;i++) {System.out.println ("Study No.:" +ss[i]. Get_stunumber () + "Name:" +ss[i].get_name () + "Age:" +ss[i].get_age () + "Gender:" +ss[i].get_sex () + "score:" +ss[i].get_score () + "\ t \ n ");}}            Determines whether the number already exists in 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; }//Add student information 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++;} Delete Student information void deletestudent (String stunumber) throws myexception{for (int i=0;i<=n;i++) {if (Ss[i].get_stunumber (). Equals (Stunumber)) {System.out.println ("Student Number:" +stunumber+ "students have been deleted!) "), if (n==1) {System.out.println (" array is empty "); ss[0]=new Student ();} else {for (int j=i;j<=n;j++) {ss[j]=ss[j+1];} n--;}} Else{throw New MyException ("The student does not exist!") ");}}} Modify student information 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 ("The student was not found!") ");}} Query Student information void Selectstudent (String number) throws myexception{for (int i=0;i<=n;i++) {if (Ss[i].get_stunumber (). Equals (number)) {System.out.println ("No.:" +ss[i].get_stunumber () + "Name:" +ss[i].get_name () + "Age:" +ss[i].get_age () + " Gender: "+ss[i].get_sex () +" score: "+ss[i].get_score () +" \t\n ");} else throw new MyException ("The student was not found!") ");}} Number of failed statistics 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 ("School Number:" +ss[i].get_stunumber () + "Name:" +ss[i].get_name () + "Age:" +ss[i].get_age () + "Gender:" +ss[i].get_ Sex () + "score:" +ss[i].get_score () + "\t\n");}} System.out.println ("The number of failed persons is:" +s+ "person");} Input interface void Showface () {System.out.println ("*****************************"); System.out.println ("Shijiazhuang Railway University student Information Management System"); System.out.println ("*****************************"); System.out.println ("1. Traverse the output of student information"); System.out.println ("2. New Student Information Entry"); System.out.println ("3. Delete Student Information"); System.out.println ("4. Modify student Information"); System.oUt.println ("5. Query student Information"); System.out.println ("6. Student information Statistics"); System.out.println ("7 exit.");} Class Login{user Users=new User ("001", "123456");//username, password//login void Login () throws MyException, ioexception{ BufferedReader in=new BufferedReader (New InputStreamReader (system.in));D Ataoutputstream out=new DataOutputStream ( New Bufferedoutputstream (New FileOutputStream ("Student.txt", True)), for (int i=1;i<=3;i++) {System.out.println (" Please enter User id: "); String Id=in.readline (); System.out.println ("Please enter password:"); String Pass=in.readline (), if ((Users.uername.equals (ID)) && (Users.passage.equals (pass))) {Studentmanager SM =new Studentmanager (); while (true) {sm.showface (); SYSTEM.OUT.PRINTLN ("Please select:"); String Choose=in.readline (), if (Choose.startswith ("1")) {sm.showstudent ();} else if (Choose.startswith ("2")) {System.out.print ("Please enter the study number:"); String Stu=in.readline (); System.out.print ("Please enter Name:"); String Name=in.readline (); System.out.print ("Please enter Age:"); String Age=in.readline (); System.out.println ("Please enter gender (true male, false female):"); String Sex=in.readline (); SysteM.out.print ("Please enter the score:"); String Score=in.readline (); if (Sm.panduan (stu)) {sm.addstudent (Stu, name, age, sex, score); SYSTEM.OUT.PRINTLN ("created successfully! Out.writeutf ("| School number:" +stu+ "| Name:" +name+ "| Age:" +age+ "| Gender:" +sex+ "| Score:" +score+ "|\t\t\n\n");} Elsethrow New MyException ("The student already exists, do not add it repeatedly");} else if (Choose.startswith ("3")) {System.out.println ("Please enter the study number:"); String Stu=in.readline (); if (! ( Sm.panduan (Stu)) {sm.deletestudent (stu);} else throw new MyException ("The school number does not exist!") ");} else if (Choose.startswith ("4")) {System.out.println ("Please enter the study number:"); String Stu=in.readline (); System.out.println ("Please enter Name:"); String Name=in.readline (); System.out.println ("Please enter Age:"); String Age=in.readline (); System.out.print ("Please enter gender (true male, false female):"); String Sex=in.readline (); System.out.print ("Please enter the score:"); String Score=in.readline (); if (! ( Sm.panduan (Stu)) {sm.updatestudent (Stu, name, age, sex, score); Out.writeutf ("| Study No.:" +stu+ "| Name:" +name+ "| Age:" +age+ "| Gender: "+sex+" | Score: "+score+" |\t\n ");} else throw new MyException ("The school number does not exist!") ");} else if (Choose.startswith ("5")) {System.out.println ("Please enter the study number:"); String Stu=in.readline (); if (! ( Sm.panduan (Stu)) {sm.selectstudent (stu);} else throw new MyException ("The school number does not exist!") ");} else if (Choose.startswith ("6")) {Sm.tongji ();} else if (Choose.startswith ("7")) {in.close (); Out.close ();   System.exit (0); }else {throw new MyException ("Select Error, please re-select");}}}   ELSESYSTEM.OUT.PRINTLN ("User ID or password is wrong, please re-enter");} throw new MyException ("The card is locked! ");}} 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);}}

　　

Java Student Information Management system and support user name login