1 00:00:01,050 --> 00:00:06,480 End this demo I'm going get the monster I feel hiding as well as the overall lighting effect that we 2 00:00:06,480 --> 00:00:06,690 can. 3 00:00:06,690 --> 00:00:10,450 How do you feel re-assignment in a subclass. 4 00:00:10,530 --> 00:00:12,280 So this is a user or Jawa. 5 00:00:12,510 --> 00:00:14,430 And here we have two instance variables. 6 00:00:14,430 --> 00:00:16,980 One is ID and the other is user type. 7 00:00:17,050 --> 00:00:21,150 So the idea for this comes from the previous run one of the previous demos. 8 00:00:21,210 --> 00:00:22,830 It is initialized to 1. 9 00:00:23,070 --> 00:00:30,240 And in the subclass staff we are really clearing ID and initializing it to in the support class it was 10 00:00:30,270 --> 00:00:31,850 initialized to 1. 11 00:00:31,860 --> 00:00:38,370 Now we also to introduce this new variable called user type and it is initialized to user unstaffed 12 00:00:38,370 --> 00:00:39,450 or Djala. 13 00:00:39,450 --> 00:00:46,480 We have introduced this constructor and here we are re initializing user type stuff. 14 00:00:46,530 --> 00:00:47,200 OK. 15 00:00:47,610 --> 00:00:53,970 And then use about Djala and new numerator called display user info has been added and it simply Prendes 16 00:00:54,120 --> 00:00:56,620 all the user attributes in this guess. 17 00:00:56,640 --> 00:01:02,880 There are only two attributes the ID and user type and it simply print them and then user does our job 18 00:01:02,880 --> 00:01:04,540 which is a tester to us. 19 00:01:04,620 --> 00:01:11,780 We are creating an instance of staff and a reference type is user and we are simply invoking the method 20 00:01:11,820 --> 00:01:13,500 display user in for. 21 00:01:13,530 --> 00:01:15,580 So let me just go ahead and run this. 22 00:01:15,900 --> 00:01:21,530 And here for I.D. It prints 1 and for user type prints stuff. 23 00:01:21,600 --> 00:01:23,180 So that's going to user. 24 00:01:23,240 --> 00:01:28,020 So for I.D. It is simply printing the value that is here. 25 00:01:28,020 --> 00:01:35,460 So it's not printing the real declared value in the subclass even though we are accessing the display 26 00:01:35,460 --> 00:01:38,820 user in format they're using a staff reference. 27 00:01:38,820 --> 00:01:45,270 So that's because the value is not overridden and ID when we access it here it will always try to access 28 00:01:45,750 --> 00:01:48,180 the ID field in the same class. 29 00:01:48,180 --> 00:01:50,990 So it's exactly like a static method. 30 00:01:51,000 --> 00:01:57,630 If you recall from our demo and in the previous lesson where the static methods cannot be overridden 31 00:01:57,630 --> 00:01:59,340 but only it can be hidden. 32 00:01:59,340 --> 00:02:04,560 So even there it was always accessing the static method in the same class. 33 00:02:04,590 --> 00:02:06,720 And that's exactly what is happening here. 34 00:02:06,840 --> 00:02:12,900 But with regards to user type the values being reassigned here in the constructor. 35 00:02:13,080 --> 00:02:18,320 And so we have only a single version of user type and we can see the overriding effect here. 36 00:02:18,390 --> 00:02:20,780 And the staff is getting printed. 37 00:02:20,820 --> 00:02:29,190 Now let's just as soon that this display user info method is installed on here it is inside the staff 38 00:02:29,190 --> 00:02:29,540 class. 39 00:02:29,550 --> 00:02:35,520 Let's just write it here and now for ID it's going to print. 40 00:02:35,880 --> 00:02:36,210 Oh 41 00:02:39,250 --> 00:02:47,250 you need to typecast us to staff. 42 00:02:48,020 --> 00:02:48,570 There you go. 43 00:02:48,570 --> 00:02:52,670 So for ID it is two and four user type it is once again staff. 44 00:02:52,710 --> 00:03:00,460 So for I.D. It was accessing the local ID value here in the same class and it's printing too. 45 00:03:00,810 --> 00:03:02,660 So that's about it.