how to create a GUI java for password and ID using array -

application ask user id , password , whether existing or new user. if new user prompted re-enter details confirm id , password , stored in array. once user clicks login button application search through array of ids , password verification. (set array contain maximum of 10 users – given small array can use linear search) application display appropriate message.

my code far

import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.util.*;  public class log extends jframe {     public static void main(string[] args)     {         log frametabel = new log();     }           jlabel title = new jlabel("please type id , password");         jlabel id = new jlabel("id:");         jlabel psword = new jlabel("password:");         jbutton blogin = new jbutton("login");         jpanel panel = new jpanel();         jtextfield txuser = new jtextfield(15);         jpasswordfield pass = new jpasswordfield(15);          jradiobutton radnew = new jradiobutton("new", true);         jradiobutton radexisting = new jradiobutton("existing", false);          buttongroup radiogroup1 = new buttongroup();          log()         {             super("week 9 question 3");             setsize(300,250);             setlocation(600,250);             panel.setlayout (null);              title.setbounds(40,5,300,20);             id.setbounds(52,40,150,20);             txuser.setbounds(70,40,150,20);             psword.setbounds(7,80,150,20);             pass.setbounds(70,80,150,20);             blogin.setbounds(180,130,80,20);              radnew.setbounds(30, 130, 50, 20);             radexisting.setbounds(90, 130, 90, 20);              panel.add(title);             panel.add(id);             panel.add(psword);             panel.add(blogin);             panel.add(txuser);             panel.add(pass);             add(radnew);             add(radexisting);             radiogroup1.add(radnew);             radiogroup1.add(radexisting);              map.put("test", "12345");               getcontentpane().add(panel);             setdefaultcloseoperation(jframe.exit_on_close);             setvisible(true);             actionlogin();         }          public void actionlogin() {             blogin.addactionlistener(new actionlistener() {                 public void actionperformed(actionevent ae) {                     string puname = txuser.gettext();                     string ppaswd = new string(pass.getpassword());                          joptionpane.showmessagedialog(null, "correct information", "correct",                                 joptionpane.information_message);                     } else {                         joptionpane.showmessagedialog(null, "no password/id found on system",                                 "incorrect", joptionpane.information_message);                         txuser.settext("");                         pass.settext("");                         txuser.requestfocus();                          if (radnew.isselected()) {                              }                              joptionpane.showmessagedialog(null,                                     "re-enter password , id confirm", "information saved",                                     joptionpane.information_message);                         }                     } }              });         } } 

use

 char[] ppaswd = pass.getpassword(); 

instead of

string ppaswd = pass.gettext(); 

because

the method gettext() type jpasswordfield deprecated.

as @madprogrammer says:

the password stored in char array , never convert string.

strings live in jvm life of jvm, making easier nasty people examine string pool , find passwords.

---

use map store username/password.

 map<string, char[]> map = new hashmap<string, char[]>(); 

put initial values

    map.put("test", "12345".tochararray());     map.put("admin", "admin".tochararray()); 

here modified code

public void actionlogin() {     blogin.addactionlistener(new actionlistener() {         public void actionperformed(actionevent ae) {             string puname = txuser.gettext();             char[] ppaswd = pass.getpassword();             if (map.keyset().contains(puname) && arrays.equals(map.get(puname), ppaswd)) {                 joptionpane.showmessagedialog(null, "correct information", "correct",                         joptionpane.information_message);             } else {                 joptionpane.showmessagedialog(null, "no password/id found on system",                         "incorrect", joptionpane.information_message);                 txuser.settext("");                 pass.settext("");                 txuser.requestfocus();                  if (radnew.isselected()) {                     if (!puname.equals("") && ppaswd.length > 0) {                         map.put(puname, ppaswd);                     }                      joptionpane.showmessagedialog(null,                             "re-enter password , id confirm", "information saved",                             joptionpane.information_message);                 }             }         }     }); }