On a 10-day basic course write down the code, bo you a smile

Import Java.util.Scanner;

public class GradeManage1 {
Information: User name, password, student name, school number, score. Each array (the array of each information is labeled the same)
/**
* users--user name passwords--password names--name numbers--study number grades--score problems--feedback question
* (currently known bug: Feedback name and score one question, will replace the first feedback) has not yet realized the function: feedback problem after processing out of feedback
* (Late expansion function: The number of registered accounts up to the limit, feedback to the administrator, the administrator can increase the number of arrays)
*/
public static void Main (string[] args) {
SYSTEM.OUT.PRINTLN ("* * Welcome to Student Information Management system * *");
string[] users = new STRING[3];
string[] passwords = new STRING[3];
string[] names = new String[3];
int[] numbers = new INT[3];
Int[] Grades = new INT[3];
string[] problems = new STRING[3];
Users[0] = "admin";
Passwords[0] = "123456";
Names[0] = "Administrator";
Menu (Users, passwords, names, numbers, grades, problems);
}

/**
* Login Homepage
*/
public static void menu (string[] users, string[] passwords, string[] names, int[] numbers, int[] grades,
String[] problems) {
Scanner S1 = new Scanner (system.in);
System.out.println ("main Menu" Please select function: ");
System.out.println ("1. Registration");
System.out.println ("2. Login:");
System.out.println ("3. Administrator Portal:");
System.out.println ("4. Exit");
String input = S1.nextline ();
switch (input) {
Case "1":
Regist (Users, passwords, names, numbers, grades, problems);
Break
Case "2":
Login (users, passwords, names, numbers, grades, problems);
Break
Case "3":
Admininput (Users, passwords, names, numbers, grades, problems);
Break
Case "4":
SYSTEM.OUT.PRINTLN ("* * * Welcome to use, goodbye!) ***");
System.exit (0);
Default
SYSTEM.OUT.PRINTLN ("Input error, please re-enter");
Menu (Users, passwords, names, numbers, grades, problems);
}
}

/**
* < students > Registration screen
*/
public static void Regist (string[] users, string[] passwords, string[] names, int[] numbers, int[] grades,
String[] problems) {
Scanner S1 = new Scanner (system.in);
System.out.println ("Please fill in the following information separately" enter OK ");
System.out.println ("1. User name:");
System.out.println ("2. Password:");
System.out.println ("3. Name:");
String user = S1.nextline ();
String password = s1.nextline ();
String name = S1.nextline ();
int k =-1;
for (int i = 0; i < users.length; i++) {
if (users[i] = = null) {
Users[i] = user;
Passwords[i] = password;
Names[i] = name;
Numbers[i] = (int) (Math.random () * 10-1);
Randomly generates a 1-9 number assigned to the number numbers array.
SYSTEM.OUT.PRINTLN ("Registration is successful, please login");
Menu (Users, passwords, names, numbers, grades, problems);
Break
} else if (users[i].equals (user)) {
System.out.println ("The user name is already in use!") ");
Regist (Users, passwords, names, numbers, grades, problems);
} else if (i = = users.length-1) {
K = i;
}
}
if (k = = users.length-1) {
Scanner s2 = new Scanner (system.in);
System.out.println ("Allow the registered population to be full, please contact the administrator to clean up or increase capacity");
System.out.println ("Are you feedback? Y/n?\n Of course you can also press any other key to cut off the power supply 0.0 ");
String choice = S2.nextline ();
Choice = Choice.touppercase ();
if (Choice.equals ("Y")) {
Problems[0] = "The system registration number is full, please increase the capacity!" ";
Menu (Users, passwords, names, numbers, grades, problems);
} else if (Choice.equals ("N")) {
Menu (Users, passwords, names, numbers, grades, problems);
} else {
System.exit (0);
}
}
}

/**
* < students > Login screen
*/
public static void Login (string[] users, string[] passwords, string[] names, int[] numbers, int[] grades,
String[] problems) {
Scanner S1 = new Scanner (system.in);
System.out.println ("User name:");
String user = S1.nextline ();
Scanner s2 = new Scanner (system.in);
System.out.println ("Password:");
String password = s2.nextline ();
int rank =-1;
for (int i = 0; i < users.length; i++) {
if (users[i].equals (user) && passwords[i].equals (password)) {
SYSTEM.OUT.PRINTLN ("Login Successful! Welcome you "+ names[i]);
rank = i;
Rank is used to indicate that the student's array subscript
function (users, passwords, names, numbers, grades, problems, rank);
Break
} else if (i = = users.length-1) {
Index data in an array and output results in the last lookup
System.out.println ("User name or password error, please try to register or re-login");
Menu (Users, passwords, names, numbers, grades, problems);
}
}
}

/**
* < students > Login function Selection section
*/
public static void function (string[] users, string[] passwords, string[] names, int[] numbers, int[] grades,
String[] problems, int rank) {
Scanner S1 = new Scanner (system.in);
System.out.println ("Function selection:");
System.out.println ("1. Query results");
System.out.println ("2. Enquiry number");
System.out.println ("3. Change Password");
System.out.println ("4. Personal Information Error feedback");
System.out.println ("5. Logout");
String choice = S1.nextline ();
Switch (choice) {
Case "1":
System.out.println ("Your score is:" + Grades[rank]);
function (users, passwords, names, numbers, grades, problems, rank);
Break
Case "2":
System.out.println ("Your school number is: j133-" + Numbers[rank]);
function (users, passwords, names, numbers, grades, problems, rank);
Break
Case "3":
Scanner s2 = new Scanner (system.in);
System.out.println ("Please enter a new password:");
String newpsd = S2.nextline ();
Passwords[rank] = NEWPSD;
SYSTEM.OUT.PRINTLN ("Change password successfully!") ");
function (users, passwords, names, numbers, grades, problems, rank);
Break
Case "4":
Takeproblems (Users, passwords, names, numbers, grades, problems, rank);
function (users, passwords, names, numbers, grades, problems, rank);
Break
Case "5":
Menu (Users, passwords, names, numbers, grades, problems);
Break
Default
SYSTEM.OUT.PRINTLN ("Input wrong, please re-enter!") ");
function (users, passwords, names, numbers, grades, problems, rank);
}
}

/**
* < students > (login) Feedback questions
*/
public static void Takeproblems (string[] users, string[] passwords, string[] names, int[] numbers, int[] grades,
String[] problems, int rank) {
Scanner S1 = new Scanner (system.in);
SYSTEM.OUT.PRINTLN ("Student Question feedback": ");
SYSTEM.OUT.PRINTLN ("Please select exception information:");
System.out.println ("1. Name is wrong");
System.out.println ("2. Incorrect results");
System.out.println ("3. Return to previous menu");
String choice = S1.nextline ();
Switch (choice) {
Case "1":
Scanner s2 = new Scanner (system.in);
System.out.println ("Please enter the correct name:");
String turename = S2.nextline ();
Problems[rank] = "User name" + users[rank "+" Student Feedback Name: "+ turename;
+ = is to prevent if the student's performance name is wrong, the data is replaced, where the + is the connector
System.out.println ("Feedback to admin, waiting for administrator to modify");
Takeproblems (Users, passwords, names, numbers, grades, problems, rank);
Break
Case "2":
Scanner s3 = new Scanner (system.in);
System.out.println ("Please enter the correct score:");
int turegrade = S3.nextint ();
Problems[rank] = "User name" + users[rank "+" Student Feedback Name: "+ Turegrade;
System.out.println ("Feedback to admin, waiting for administrator to modify");
Takeproblems (Users, passwords, names, numbers, grades, problems, rank);
Break
Case "3":
function (users, passwords, names, numbers, grades, problems, rank);
Break
Default
SYSTEM.OUT.PRINTLN ("Input wrong, please re-enter!") ");
Takeproblems (Users, passwords, names, numbers, grades, problems, rank);
}
}

/**
* < Administrator > Login Input Confirmation
*/
public static void Admininput (string[] users, string[] passwords, string[] Names , int[] numbers, int[] grades,
string[] problems) {
Scanner S1 = new Scanner (system.in);
System.out.println ("Admin account:");
String inputuser = S1.nextline ();
Scanner s2 = new Scanner (system.in);
System.out.println ("Administrator password:");
String inputpsd = S2.nextline ();
if (Inputuser.equals (users[0]) && inputpsd.equals (Passwords[0])) {
System.out.println ("Login Successful! Welcome administrator ");
Adminmenu (Users, passwords, names, numbers, grades, problems);
} else {
System.out.println ("Incorrect account or password! ");
Menu (Users, passwords, names, numbers, grades, problems);
}
}

/**
* < admin > Login Menu Interface
*/
public static void Adminmenu (string[] users, string[] passwords, string[] names, int[] numbers, int[] grades,
String[] problems) {
Scanner S1 = new Scanner (system.in);
SYSTEM.OUT.PRINTLN ("Select function": ");
System.out.println ("1. New student Information");
System.out.println ("2. View changes to student information");
System.out.println ("3. View problem feedback");
System.out.println ("4. Change Password");
System.out.println ("5. Logout");
String input = S1.nextline ();
switch (input) {
Case "1":
Newinformation (Users, passwords, names, numbers, grades, problems);
Break
Case "2":
Findfix (Users, passwords, names, numbers, grades, problems);
Break
Case "3":
Problems (Users, passwords, names, numbers, grades, problems);
Break
Case "4":
NEWPSD (Users, passwords, names, numbers, grades, problems);
Break
Case "5":
Menu (Users, passwords, names, numbers, grades, problems);
Break
}
}

/**
* < admin > New Student Information
*/
public static void Newinformation (string[] users, string[] passwords, string[] names, int[] numbers, int[] grades,
String[] problems) {
Scanner S1 = new Scanner (system.in);
System.out.println ("New Student Information": ");
System.out.println ("Please fill in the following information separately" enter OK ");
System.out.println ("1. User name:");
System.out.println ("2. Password:");
System.out.println ("3. Name:");
System.out.println ("4. Score:");
String user = S1.nextline ();
String password = s1.nextline ();
String name = S1.nextline ();
int grade = S1.nextint ();
for (int i = 0; i < users.length; i++) {
if (users[i] = = null) {
The value of the array is null to indicate that it is not registered
Users[i] = user;
Passwords[i] = password;
Names[i] = name;
Grades[i] = grade;
System.out.println ("The student information has been added!") ");
System.out.print ("Username:" + users[i] + "Password:" + passwords[i] + "\ n Name:" + names[i] + "score" + grades[i]);
Scanner s2 = new Scanner (system.in);
System.out.println ("Continue to add? y/n? ");
SYSTEM.OUT.PRINTLN ("Input other will explode!") ");
String choice = S2.nextline ();
Choice = Choice.touppercase ();
if (Choice.equals ("Y")) {
Newinformation (Users, passwords, names, numbers, grades, problems);
} else if (Choice.equals ("N")) {
Adminmenu (Users, passwords, names, numbers, grades, problems);
} else {
System.out.println ("Cheat you!" ");
Adminmenu (Users, passwords, names, numbers, grades, problems);
}
Break
} else if (i = = users.length-1) {
Index fully
SYSTEM.OUT.PRINTLN ("Student storage is full, need to expand storage capacity!") ");
}
}
}

/**
* < admin > View Modify student Information
*/
public static void Findfix (string[] users, string[] passwords, string[] names, Int[] Numbers, int[] grades,
string[] problems) {
Scanner S1 = new Scanner (system.in);
System.out.println ("View changes to student information": ");
System.out.println ("1. Enter user name lookup");
System.out.println ("2. Enter name lookup:");
System.out.println ("3. Enter the study number to find:");
System.out.println ("4. Return to the previous menu:");
String input = S1.nextline ();
Switch (input) {
Case "1":
Find_user (Users, passwords, names, numbers, grades, problems);
Break
Case "2":
Find_name (Users, passwords, names, numbers, grades, problems);
Break
Case "3":
Find_number (Users, passwords, names, numbers, grades, problems);
Break
Case "4":
Adminmenu (Users, passwords, names, numbers, grades, problems);
Break
Default:
System.out.println ("Input error, please reenter");
Findfix (Users, passwords, names, numbers, grades, problems);
}
}

/**
* < Administrator > (find information) user name find
*/
public static void Find_user (string[] users, string[] passwords, string[] n Ames, int[] numbers, int[] grades,
string[] problems) {
Scanner S1 = new Scanner (system.in);
System.out.println ("User name:");
String user = S1.nextline ();
for (int i = 0; i < users.length; i++) {
if (users[i].equals (user)) {
System.out.println ("user" + Users[i] + " Information as follows ");
System.out.println ("" If you want to modify please enter the front number, return Please enter n "");
System.out.println ("PS: User name, school number cannot be modified");
System.out.println ("study number:" + numbers[i]);
System.out.println ("1. Name:" + names[i]);
System.out.println ("2. Score:" + grades[i]);
Fix_user (Users, passwords, names, numbers, grades, problems, I);
Findfix (Users, passwords, names, numbers, grades, problems);
}
}
}

/**
* < Administrator > (user name Lookup) modify Information
*/
public static void Fix_user (string[] users, string[] passwords, string[] Na MES, int[] numbers, int[] grades,
string[] problems, int i) {
Scanner S1 = new Scanner (system.in);
String choice = S1.nextline ();
Choice = Choice.touppercase ();
Switch (choice) {
Case "1":
System.out.println ("Modify Name:");
Scanner s2 = new Scanner (system.in);
String name = S2.nextline ();
Names[i] = name;
System.out.println ("modified successfully! ");
break;
Case "2":
System.out.println ("Modify Result:");
Scanner s3 = new Scanner (system.in);
int grade = S3.nextint ();
Grades[i] = grade;
System.out.println ("modified successfully! ");
break;
Case ' N ':
break;
Default:
System.out.println ("Input error, please reenter");
Find_user (Users, passwords, names, numbers, grades, problems);
}
}

/**
* < Administrator > (find information) name Lookup
*/
public static void Find_name (string[] users, string[] passwords, string[] Na MES, int[] numbers, int[] grades,
string[] problems) {
Scanner S1 = new Scanner (system.in);
System.out.println ("Name:");
String name = S1.nextline ();
for (int i = 0; i < names.length; i++) {
if (names[i].equals (name)) {
System.out.println ("name + Names[i] +" Information as follows ");
System.out.println ("" If you want to modify please enter the front number, return Please enter n "");
System.out.println ("PS: User name, school number cannot be modified");
System.out.println ("study number:" + numbers[i]);
System.out.println ("User name:" + users[i]);
System.out.println ("1. Score:" + grades[i]);
Fix_name (Users, passwords, names, numbers, grades, problems, I);
Findfix (Users, passwords, names, numbers, grades, problems);
}
}
}

/**
* < Administrator > (name lookup) modify Information
*/
public static void Fix_name (string[] users, string[] passwords, string[] Nam ES, int[] numbers, int[] grades,
string[] problems, int i) {
Scanner S1 = new Scanner (system.in);
String choice = S1.nextline ();
Choice = Choice.touppercase ();
Switch (choice) {
Case "1":
System.out.println ("Modify Result:");
Scanner s2 = new Scanner (system.in);
int grade = S2.nextint ();
Grades[i] = grade;
System.out.println ("modified successfully! ");
break;
Case ' N ':
break;
Default:
System.out.println ("Input error, please reenter");
Find_name (Users, passwords, names, numbers, grades, problems);
}
}

/**
* < Administrator > (find information) study number lookup
*/
public static void Find_number (string[] users, string[] passwords, string[] Names, int[] numbers, int[] grades,
string[] problems) {
Scanner S1 = new Scanner (system.in);
System.out.println ("Study No.:");
int number = S1.nextint ();
for (int i = 0; i < numbers.length; i++) {
if (numbers[i] = = number) {
System.out.println ("study number" + Numbers[i] + "Information is as follows");
System.out.println ("" If you want to modify please enter the front number, return Please enter n "");
System.out.println ("PS: User name, school number cannot be modified");
System.out.println ("User name:" + users[i]);
System.out.println ("1. Name:" + names[i]);
System.out.println ("2. Score:" + grades[i]);
Fix_number (Users, passwords, names, numbers, grades, problems, I);
Findfix (Users, passwords, names, numbers, grades, problems);
}
}
}

/**
* < Administrator > (user name Lookup) modify Information
*/
public static void Fix_number (string[] users, string[] passwords, string[] Names, int[] numbers, int[] grades,
string[] problems, int i) {
Scanner S1 = new Scanner (system.in);
String choice = S1.nextline ();
Choice = Choice.touppercase ();
Switch (choice) {
Case "1":
System.out.println ("Modify Name:");
Scanner s2 = new Scanner (system.in);
String name = S2.nextline ();
Names[i] = name;
System.out.println ("modified successfully! ");
break;
Case "2":
System.out.println ("Modify Result:");
Scanner s3 = new Scanner (system.in);
int grade = S3.nextint ();
Grades[i] = grade;
System.out.println ("modified successfully! ");
break;
Case ' N ':
break;
Default:
System.out.println ("Input error, please reenter");
Find_number (Users, passwords, names, numbers, grades, problems);
}
}

/**
* < admin > View problem Feedback
*/
public static void problems (string[] users, string[] passwords, string[] Names , int[] numbers, int[] grades,
string[] problems) {
System.out.println ("Feedback on the following questions:");
for (int i = 0; i < users.length; i++) {
if (problems[i]! = null) {
System.out.println (problems[i]);
} else if (Problems[i] = = NULL && i = = users.length-1) {
System.out.println ("No feedback Information");
Adminmenu (Users, passwords, names, numbers, grades, problems);
}
}
}

/**
* < admin > Change Password
*/
public static void Newpsd (string[] users, string[] passwords, string[] names, int[] numbers, int[] grades,
String[] problems) {
SYSTEM.OUT.PRINTLN ("Please select": ");
Scanner S1 = new Scanner (system.in);
System.out.println ("1. Student password reset");
System.out.println ("2. Administrator password Modification:");
System.out.println ("3. return");
String input = S1.nextline ();
switch (input) {
Case "1":
STUDENTPSD (Users, passwords, names, numbers, grades, problems);
Break
Case "2":
ADMINPSD (Users, passwords, names, numbers, grades, problems);
Break
Case "3":
Adminmenu (Users, passwords, names, numbers, grades, problems);
Break
Default
SYSTEM.OUT.PRINTLN ("Input error, please re-enter");
NEWPSD (Users, passwords, names, numbers, grades, problems);
}
}

/**
* < admin > (change password) student password reset
*/

public static void Studentpsd (string[] users, string[] passwords, string[] names, int[] numbers, int[] grades,
String[] problems) {
System.out.println ("Enter the username that requires a password reset:");
Scanner S1 = new Scanner (system.in);
String user = S1.nextline ();
for (int i = 0; i < users.length; i++) {
if (users[i]! = null && user.equals (Users[i])) {
SYSTEM.OUT.PRINTLN ("New password:");
Scanner s2 = new Scanner (system.in);
String password = s2.nextline ();
Passwords[i] = password;
SYSTEM.OUT.PRINTLN ("Password has been reset! ");
NEWPSD (Users, passwords, names, numbers, grades, problems);
Break
}else if (i = = users.length-1) {
System.out.println ("The user name does not exist! ");
NEWPSD (Users, passwords, names, numbers, grades, problems);
}
}
}

/**
* < admin > (change Password) Administrator password modification
*/

public static void Adminpsd (string[] users, string[] passwords, string[] names, int[] numbers, int[] grades,
String[] problems) {
System.out.println ("Enter new password:");
Scanner S1 = new Scanner (system.in);
String password = s1.nextline ();
Passwords[0] = password;
SYSTEM.OUT.PRINTLN ("Password modified successfully");
NEWPSD (Users, passwords, names, numbers, grades, problems);
}
}

On a 10-day basic course write down the code, bo you a smile