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This article is about how Java implements a user management system. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

The details are as follows

The function and method of this system are relatively simple.

The system inputs the basic information of the commodity through the console, and joins the login of the administrator and operates on whether it is an administrator or not.

For the implementation of the function, three classes are defined respectively.

User basic attribute class

This class contains user id, account number, password, age, role (administrator or not), mailbox, office, account status

Private int id;// id private String username;// account private String password;// password private int age;// age private String role;// role private String email;// email private String officeID;// office private String status;// account status

Quickly generate its attribute get/set method and constructor by shortcut key method

@ Overridepublic String toString () {return id + "\ t" + username + "\ t" + password + "\ t" + age + "\ t" + role + "\ t" + email + "\ t" + officeID + "\ t" + status;} public User (int id, String username, String password, int age, String role, String email, String officeID, String status) {super (); this.id = id This.username = username; this.password = password; this.age = age; this.role = role; this.email = email; this.officeID = officeID; this.status = status;} public int getId () {return id;} public void setId (int id) {this.id = id;} public String getUsername () {return username } public void setUsername (String username) {this.username = username;} public String getPassword () {return password;} public void setPassword (String password) {this.password = password;} public int getAge () {return age;} public void setAge (int age) {this.age = age;} public String getRole () {return role } public void setRole (String role) {this.role = role;} public String getEmail () {return email;} public void setEmail (String email) {this.email = email;} public String getOfficeID () {return officeID;} public void setOfficeID (String officeID) {this.officeID = officeID;} public String getStatus () {return status } public void setStatus (String status) {this.status = status;}

Complete the definition of user attributes

Modification of user attributes and implementation of functions in the new class

The basic information of the array can be stored through ArrayList dynamic array.

Scanner method to use the console input function, combined with the method to enter the corresponding information

Static int i = 0; String [] admin = {"admin", "admin123"}; static ArrayList list = new ArrayList (); private Scanner sc = new Scanner (System.in)

The function of adding, deleting, changing and searching is realized by the combination of simple if/else statement and for loop.

The addition of users and the change of password practice the ability of the console to enter and modify information.

/ * * 1-user adds * / public void add (User u) {list.add (u);} / * * 2-password modification (password modification according to Id) * / public boolean modifypassword (int id, String password) {User user = findById (id); if (user! = null) {user.setPassword (password); return true } return false;} / * * 3-View personal information according to ID * / public User findById (int id) {User us = null; for (User u: list) {if (u.getId () = = id) {us = u; break;}} return us } / * * 4-modify account status according to ID (disable 0, enable 1) * / public boolean modifystatus (int id, String status) {User user = findById (id); if (user! = null) {user.setStatus (status); return true;} return false } / * * 5-user login * / public void register () {System.out.println ("Please enter user name:"); if (sc.next (). Equals (admin [0])) {System.out.println ("Please enter password:") If (sc.next (). Equals (admin [1])) {System.out.println ("login succeeded!");} else {System.out.println ("wrong password! Please re-enter! "); register ();}} else {System.out.println (" user name error! Please re-enter!); register ();}} / * * 6-modify user role (setting to cancel administrator) * / public boolean modifyrole (int id, String role) {User user = findById (id); if (user! = null) {user.setRole (role); return true;} return false } / * * 7-user list * / public ArrayList findAll () {return list;} / * * 8-Delete user * / public boolean delete (int id) {User user = findById (id); if (user! = null) {return list.remove (user);} return false;}

Therefore, some necessary functions are completed by means of methods.

Then call the function of other classes and complete the interface information through another main window class.

Create the main program entry class, and complete the input interface and instructions in the class

Input window instruction interface

Private UserModule um = new UserModule (); private Scanner sc = new Scanner (System.in); / * * instruction interface of input window * / public void menu () {msg ("= ="); msg ("= SOFTEEM user management system ="); msg ("= [1] user add = ="); msg ("= [2] password modification = =") Msg ("= [3] personal information view ="); msg ("= [4] account status modification (disable 0, enable 1) ="); msg ("= [5] user login = ="); msg ("= [6] modify user role (set to cancel administrator) ="); msg ("= [7] user list = =") Msg ("= [8] Delete user = ="); msg ("= [0] exit system = ="); msg ("Please enter operation instructions:"); start ();}

Complete the entry of program keys through the basic statement switch

/ * * Program key entry * / private void start () {sc = new Scanner (System.in); int I = sc.nextInt (); switch (I) {case 1: add (); break; case 2: alter (); break; case 3: queryById (); break Case 4: thestatus (); break; case 5: enter (); break; case 6: update (); break; case 7: list (); break; case 8:daima delete (); break Case 0: exit (); break; default: msg ("Please enter correct operation instructions!!"); break;} menu ();}

This method can deal with the trouble of code that often use the output window, directly call this internal method to realize the output statement, and complete the output statement more succinctly.

/ * * compatible input attributes * / public void msg (Object obj) {System.out.println (obj);}

The user can be added with the method in the previous class, and the subsequent function is the same as this function. There is an input window in the switch statement that can call this kind of method.

/ * * 1-client implementation added by the user * / private void add () {msg ("Please enter user information: ((in the following format: Id/ account number / password / age / role / mailbox / office / account status)"); sc = new Scanner (System.in); String s = sc.nextLine () / / intercept user information according to "/" String [] info = s.split ("/"); if (um.findById (Integer.parseInt (info [0]))! = null) {msg ("the ID user already exists, please re-enter"); add (); return } else {User u = new User (Integer.parseInt (info [0]), info [1], info [2], Integer.parseInt (info [3]), info [4], info [5], info [6], info [7]); um.add (u); msg ("added successfully!");}}

Modify the password according to the user's ID, and confirm and modify the password information with a simple judgment statement.

/ * * 2-change password according to ID * / private void alter () {sc = new Scanner (System.in); msg ("Please enter user's ID:"); int id = sc.nextInt (); msg ("password changed to:"); String passwor = sc.next (); if (um.modifypassword (id, passwor)) {msg ("modified successfully!") } else {msg ("modification failed!");}}

Use ID to view users' personal information

/ * * 3-personal information view * / private void queryById () {sc = new Scanner (System.in); msg ("Please enter the user ID to be queried"); int id = sc.nextInt (); User u = um.findById (id); if (u = = null) {msg (id + "number does not exist, please re-enter"); queryById () Return;} msg ("Id\ t account\ t password\ t\ t age\ t role\ t email\ t\ t office\ t account status\ t"); msg (u);}

Modify the user's status (whether disabled or not) after entering the user's ID

/ * * 4-account status modification (disable 0, enable 1) * / private void thestatus () {sc = new Scanner (System.in); msg ("Please enter user ID:"); int id = sc.nextInt (); msg ("account status modification (0prime 1):"); String status = sc.next () If (um.modifystatus (id, status)) {msg ("modified successfully!");} else {msg ("failed to modify!");}}

Combine the previously defined user information to achieve a simple user login function.

/ * * 5-user login * / private void enter () {UserModule um = new UserModule (); um.register ();}

Modify the user role (whether it is an administrator) and give it permission

/ * * 6-modify user roles * / private void update () {sc = new Scanner (System.in); msg ("Please enter user ID:"); int id = sc.nextInt (); msg ("role modification (administrator):"); String role = sc.next () If (um.modifyrole (id, role)) {msg ("modified successfully!");} else {msg ("failed to modify!");}}

List and output the saved user information

/ * * 7-user list * / private void list () {msg ("Id\ t account\ t password\ t\ t age\ t role\ t email\ t\ t office\ t account status\ t"); for (User u: um.findAll ()) {msg (u);}}

Delete function, delete the user information stored in the array according to ID

/ * * 8-Delete user according to ID * / private void delete () {sc = new Scanner (System.in); msg ("Please enter user ID:"); int id = sc.nextInt (); if (um.delete (id)) {msg ("deletion successful!");} else {msg ("deletion failed!");}}

Add a simple function to exit the system and close the Console window without a mouse

/ * * 0-formal exit * / private void exit () {sc = new Scanner (System.in); msg ("are you sure you want to quit? (YCompN)"); String op = sc.next (); if (op.equalsIgnoreCase ("Y")) {msg ("Thank you for using, goodbye!"); System.exit (1);}}

The program execution entry of this kind calls the system user login method and the main window method, and then realizes all the functions in the called method.

Public static void main (String [] args) {TestUser tu = new TestUser (); tu.enter (); tu.menu ();}

The technical content is not high to complete a system with the function of user login, adding, deleting, changing and querying user information.

Thank you for reading! This is the end of the article on "how to implement the user management system in Java". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it out for more people to see!

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