1
00:00:00,300 --> 00:00:01,180
‫Welcome back.

2
00:00:01,200 --> 00:00:06,390
‫And this video we are going to solve the challenge from last lecture.

3
00:00:06,390 --> 00:00:11,490
‫And I hope you try to do it yourself and you fix it or you solve the problem.

4
00:00:11,490 --> 00:00:17,100
‫So let's go ahead and create a login system and a well register system.

5
00:00:17,100 --> 00:00:20,100
‫We need first of all to register before we can log in.

6
00:00:20,100 --> 00:00:22,440
‫So let's create two methods to do that.

7
00:00:22,440 --> 00:00:29,820
‫One of them is going to be public void or actually registration could go right.

8
00:00:30,150 --> 00:00:33,720
‫It can be void and register.

9
00:00:34,410 --> 00:00:42,480
‫And then in here we want to do all the registration, but as we want to use this method inside of our

10
00:00:42,480 --> 00:00:44,820
‫main method, we need to make it static.

11
00:00:46,080 --> 00:00:49,620
‫So in here we need to do certain things.

12
00:00:49,620 --> 00:00:55,020
‫First of all, we need to check or we need to tell the user what to do.

13
00:00:55,050 --> 00:00:57,480
‫Console right line.

14
00:00:58,410 --> 00:01:09,480
‫Please enter your username and then the user can enter his username and we want to store that username

15
00:01:09,480 --> 00:01:12,150
‫somewhere at least for the runtime.

16
00:01:12,150 --> 00:01:20,640
‫So we need to create a new variable here, which I'm going to call static string username.

17
00:01:21,990 --> 00:01:27,060
‫And in here we set the username as whatever the user has entered.

18
00:01:27,060 --> 00:01:30,120
‫So console dot read line.

19
00:01:32,520 --> 00:01:39,780
‫Next, I want to do the same thing with the password, so I'm going to copy the code and I'm going to

20
00:01:39,780 --> 00:01:44,850
‫replace that with password and I'm going to replace this.

21
00:01:45,610 --> 00:01:47,460
‫Username with password as well.

22
00:01:47,470 --> 00:01:50,680
‫Therefore I will need a password variable.

23
00:01:50,680 --> 00:01:54,130
‫So static string password.

24
00:01:55,330 --> 00:01:57,760
‫And here of course we won't need the username anymore.

25
00:01:57,760 --> 00:01:59,230
‫We will need the password.

26
00:01:59,230 --> 00:02:03,280
‫So first we check for the username, then we check for the password.

27
00:02:03,830 --> 00:02:10,700
‫Once that is done, once the user has registered, we want to tell him registration has worked.

28
00:02:10,910 --> 00:02:16,440
‫So registration, complete it.

29
00:02:18,290 --> 00:02:27,590
‫And then maybe even another line where we simply have a bunch of dashes just like that.

30
00:02:28,490 --> 00:02:28,910
‫All right.

31
00:02:28,910 --> 00:02:31,330
‫So that's how we can register the user.

32
00:02:31,340 --> 00:02:37,970
‫And now let's create the login method, public static void login.

33
00:02:37,970 --> 00:02:42,080
‫And that one will be quite similar to the register method.

34
00:02:42,080 --> 00:02:45,650
‫So I'm just going to check for the username first.

35
00:02:46,250 --> 00:02:50,660
‫And in here I have first ask for it and then I check if it actually works.

36
00:02:50,660 --> 00:02:57,320
‫So if username is equal, so double equals sign whatever the user has entered.

37
00:02:57,530 --> 00:03:04,010
‫If that's the case, then go ahead and run the following code.

38
00:03:04,010 --> 00:03:06,140
‫Check for the password.

39
00:03:06,140 --> 00:03:19,010
‫So then go ahead and ask for the password and check if password is equal to whatever the user has entered.

40
00:03:19,340 --> 00:03:24,500
‫Now we can go ahead and write to the user that logging in has worked.

41
00:03:25,040 --> 00:03:34,430
‫So red line login successful and if it didn't work, so if the user has not entered the correct value

42
00:03:34,430 --> 00:03:36,050
‫then we'll tell him.

43
00:03:36,860 --> 00:03:38,570
‫Log in failed.

44
00:03:39,200 --> 00:03:43,670
‫Wrong password restart program.

45
00:03:46,060 --> 00:03:47,470
‫And the same thing.

46
00:03:47,650 --> 00:03:53,590
‫We're going to tell him if it didn't work to log in because he didn't enter the correct username.

47
00:03:54,460 --> 00:04:02,860
‫So in here we simply say console right line login failed, wrong username restart program.

48
00:04:02,860 --> 00:04:09,790
‫In our case, we don't have wild loops yet, so we don't have the capability of running while loops

49
00:04:09,790 --> 00:04:13,990
‫so the user can log in again or try to log in multiple times.

50
00:04:14,200 --> 00:04:16,690
‫So we're just going to solve it that way now.

51
00:04:16,690 --> 00:04:18,670
‫So we say restart the program.

52
00:04:19,960 --> 00:04:22,690
‫So we have an if statement where we check.

53
00:04:23,320 --> 00:04:24,940
‫Did it work?

54
00:04:24,940 --> 00:04:27,280
‫So did the user enter the correct username.

55
00:04:27,280 --> 00:04:29,890
‫If he did, then we ask for his password.

56
00:04:29,890 --> 00:04:34,510
‫If he entered the right password, we simply say, All right, cool, you're logged in.

57
00:04:34,540 --> 00:04:39,280
‫If you didn't enter the right password, we say, login failed and the password was incorrect.

58
00:04:39,280 --> 00:04:45,910
‫By the way, if he failed to enter the right username, we run into this LX statement and we simply

59
00:04:45,910 --> 00:04:48,370
‫say, okay, failed to log in.

60
00:04:49,180 --> 00:04:59,020
‫Now what we can do is we can go ahead and register and then we can log in.

61
00:05:01,300 --> 00:05:11,710
‫And finally we need to do console, right, to do anything so that at least something is written onto

62
00:05:11,710 --> 00:05:12,580
‫the console.

63
00:05:13,390 --> 00:05:14,110
‫All right.

64
00:05:14,110 --> 00:05:19,360
‫So we had to create global variables here, and we haven't covered that in too much detail yet.

65
00:05:19,360 --> 00:05:25,360
‫But we need to create them globally because we need to use them in multiple methods.

66
00:05:26,110 --> 00:05:29,230
‫That's something that is based on scope.

67
00:05:29,230 --> 00:05:34,900
‫So we have covered scope and well, that's pretty much what it's really about.

68
00:05:34,900 --> 00:05:36,640
‫So let's check it out.

69
00:05:36,640 --> 00:05:38,770
‫Let's run the code and see if it works.

70
00:05:38,770 --> 00:05:40,720
‫So please enter your username.

71
00:05:40,720 --> 00:05:43,480
‫I'm going to enter Dennis and your password.

72
00:05:43,480 --> 00:05:48,340
‫Password one highly secure password now registration complete.

73
00:05:48,340 --> 00:05:50,110
‫Now please enter your username.

74
00:05:50,440 --> 00:05:56,710
‫I'm going to enter Dennis and I'm going to enter a wrong password and it says login failed wrong password.

75
00:05:56,710 --> 00:06:01,330
‫Restart the program so I'm going to close and start again.

76
00:06:03,490 --> 00:06:07,240
‫Please enter username then is again password one.

77
00:06:07,520 --> 00:06:13,180
‫Now I'm going to type in an incorrect username login failed wrong username reset program.

78
00:06:13,180 --> 00:06:14,530
‫All right, I'm going to do that.

79
00:06:14,530 --> 00:06:16,510
‫And now let's enter it correctly.

80
00:06:16,510 --> 00:06:23,950
‫So then is password one then is password one.

81
00:06:24,370 --> 00:06:25,500
‫Log in successful.

82
00:06:25,510 --> 00:06:25,840
‫Great.

83
00:06:25,840 --> 00:06:27,220
‫And now I can start hacking.

84
00:06:27,730 --> 00:06:34,030
‫All right, so now you know how to create a very, very basic login screen or register and login screen.

85
00:06:34,030 --> 00:06:40,720
‫Of course, we don't store the information yet, at least not longer than runtime, but we will see

86
00:06:40,720 --> 00:06:43,780
‫how to store data permanently later on.

87
00:06:44,650 --> 00:06:45,040
‫Great.

88
00:06:45,040 --> 00:06:49,240
‫I hope you could manage to build something similar to that and could test it.

89
00:06:49,240 --> 00:06:51,940
‫And well if not, no worries.

90
00:06:51,940 --> 00:06:58,330
‫Try to shut this down or close this and just try to rebuild it tomorrow.

91
00:06:58,360 --> 00:07:04,840
‫So give yourself some time and just try to do yourself based on memory and based on what you have learned.

92
00:07:04,840 --> 00:07:06,790
‫So just try to do that tomorrow.

93
00:07:07,180 --> 00:07:07,570
‫Great.

94
00:07:07,570 --> 00:07:11,110
‫So I'd say that's a good start for a login screen.

95
00:07:11,260 --> 00:07:13,540
‫And in the next video, we're going to go ahead.

96
00:07:13,540 --> 00:07:14,740
‫So see you there.