1 00:00:00,450 --> 00:00:02,370 Again I referred to the name of the text. 2 00:00:02,370 --> 00:00:06,500 Your class takes the bird. 3 00:00:07,080 --> 00:00:15,560 And then I put an assignment operator here and then I cast this object to a text you object find view 4 00:00:15,570 --> 00:00:24,780 by ID card that Id dot X the bird and then I put a semi-colon at the end of my statement. 5 00:00:24,780 --> 00:00:29,130 OK so now I can interact with these components in the screen here. 6 00:00:29,130 --> 00:00:29,640 OK. 7 00:00:29,880 --> 00:00:40,750 I just need to refer to the name of that the animal object the animal that said text animal on that. 8 00:00:40,860 --> 00:00:46,150 And then I referred to the name of the string Meffert that I override it inside the Animal class. 9 00:00:46,180 --> 00:00:50,140 OK so now let's actually run our project and see what happens. 10 00:00:50,280 --> 00:00:50,940 OK. 11 00:00:51,000 --> 00:00:54,500 As you can see here this is the value that is outputted here. 12 00:00:54,510 --> 00:00:57,680 OK name Tiger Carlier aren't. 13 00:00:57,960 --> 00:01:01,300 And these are the two values for the speed and power. 14 00:01:01,440 --> 00:01:04,790 So as you can see here we cannot understand. 15 00:01:04,890 --> 00:01:06,950 What are these values relate to. 16 00:01:06,960 --> 00:01:07,640 OK. 17 00:01:07,770 --> 00:01:14,970 So let's actually go back inside the animate Animal class and as you can see here here I can actually 18 00:01:14,970 --> 00:01:21,810 put others tokens in order to specify what are these amount of speed instance valuable and this amount 19 00:01:21,810 --> 00:01:24,200 of power instance variable relate to. 20 00:01:24,320 --> 00:01:25,300 OK. 21 00:01:25,320 --> 00:01:29,720 So let's actually put another percent here. 22 00:01:32,430 --> 00:01:37,040 Person as colon and let's actually put another percent here. 23 00:01:37,110 --> 00:01:38,010 OK. 24 00:01:38,670 --> 00:01:45,030 So now we need to actually put other arguments here in order to actually relate those arguments to these 25 00:01:46,260 --> 00:01:47,070 tokens here. 26 00:01:47,070 --> 00:01:47,770 OK. 27 00:01:47,970 --> 00:01:54,370 So after this color instance variable i just need to put in two double coats and that inside double 28 00:01:54,370 --> 00:01:54,790 quotes. 29 00:01:54,800 --> 00:01:56,980 I can just type in speed. 30 00:01:57,080 --> 00:01:57,490 OK. 31 00:01:57,510 --> 00:02:04,110 And then I put in a comma here and after this amount of spit instance variable i just need to put into 32 00:02:04,140 --> 00:02:06,830 double quotes and then inserted double quotes. 33 00:02:06,840 --> 00:02:09,030 I just need to type in power. 34 00:02:09,030 --> 00:02:15,660 So as you can see here now this string literal here is related to these are actually at auction here. 35 00:02:15,660 --> 00:02:15,910 OK. 36 00:02:15,900 --> 00:02:16,370 Percent. 37 00:02:16,390 --> 00:02:16,800 Yes. 38 00:02:16,860 --> 00:02:17,530 OK. 39 00:02:17,730 --> 00:02:21,470 We specified that we are going to have an argument of type. 40 00:02:21,540 --> 00:02:22,210 Strange. 41 00:02:22,290 --> 00:02:22,880 OK. 42 00:02:23,310 --> 00:02:27,680 And these are is here is actually related to this string lead role here. 43 00:02:27,690 --> 00:02:28,340 OK. 44 00:02:28,380 --> 00:02:30,000 So let's actually put a comma here. 45 00:02:30,090 --> 00:02:32,270 As you can see there is an error here. 46 00:02:32,310 --> 00:02:38,930 We need to actually put a comma here in order to actually separate these arguments here. 47 00:02:39,060 --> 00:02:43,080 And if I don't my project again let's see what happens. 48 00:02:43,110 --> 00:02:48,130 Now it's going to take quite some time in order to actually run our project as you can see. 49 00:02:48,160 --> 00:02:55,060 This is the value that is out with that Hiroki named Tiger color aren't speed 60 power 60. 50 00:02:55,080 --> 00:02:55,480 OK. 51 00:02:55,500 --> 00:02:59,090 So as you can see here with just two line of codes we did manage. 52 00:02:59,280 --> 00:03:02,910 We did manage to output these values to the screen here. 53 00:03:02,910 --> 00:03:03,400 OK. 54 00:03:03,450 --> 00:03:07,610 So that's the power of inheritance inside the animal class. 55 00:03:07,890 --> 00:03:11,120 Let's actually double click on this tab here. 56 00:03:11,610 --> 00:03:19,120 I actually override this method in order to actually output a string value to the screen. 57 00:03:19,230 --> 00:03:19,750 OK. 58 00:03:19,920 --> 00:03:26,640 And here in say the main activity class here as you can see I created an object from the friendly animal 59 00:03:26,640 --> 00:03:34,610 class and with only one line of code I did manage to actually output this value to the screen here. 60 00:03:34,610 --> 00:03:34,930 OK. 61 00:03:34,950 --> 00:03:37,730 Next the animal that takes animal won. 62 00:03:37,800 --> 00:03:38,580 That was three. 63 00:03:38,610 --> 00:03:39,500 OK. 64 00:03:39,960 --> 00:03:41,550 So hopefully that makes sense. 65 00:03:41,700 --> 00:03:46,940 So now let's actually go on and work on these cat class here. 66 00:03:46,950 --> 00:03:47,600 OK. 67 00:03:47,850 --> 00:03:48,400 OK. 68 00:03:48,540 --> 00:03:52,870 Now inside the cat class I want to actually create some instance variables. 69 00:03:52,890 --> 00:03:53,790 OK. 70 00:03:54,150 --> 00:03:59,270 So remember that only specific types of animals are inside the cat family. 71 00:03:59,290 --> 00:04:03,870 Like actually Tigers lion leopard and other animals. 72 00:04:03,870 --> 00:04:04,510 OK. 73 00:04:04,860 --> 00:04:09,640 So first I want to actually create some instance variables private. 74 00:04:10,440 --> 00:04:12,220 OK fine. 75 00:04:12,330 --> 00:04:19,680 So this idea is going to be a constant stream data type of my variable is a string and the name of my 76 00:04:19,680 --> 00:04:21,170 variable is name. 77 00:04:21,400 --> 00:04:29,060 Ok private fine on a strange color. 78 00:04:32,230 --> 00:04:36,940 Private's ain't amount of speed. 79 00:04:39,380 --> 00:04:40,940 Ok private 80 00:04:44,520 --> 00:04:47,070 ain't amount of power 81 00:04:51,380 --> 00:04:52,650 OK. 82 00:04:52,910 --> 00:05:00,170 So as you can see here I am actually duplicating some codes that are inside to inside the Animal class 83 00:05:00,170 --> 00:05:03,170 here into this chat class here. 84 00:05:03,170 --> 00:05:03,790 OK. 85 00:05:03,990 --> 00:05:10,880 So and there is a reason for that and I want to actually show you if we don't actually use the inheritance 86 00:05:11,000 --> 00:05:14,710 what are the problems that we may encounter in our projects. 87 00:05:14,720 --> 00:05:15,400 OK. 88 00:05:15,530 --> 00:05:20,730 So here I am actually duplicating some codes that are inside the animal class. 89 00:05:20,850 --> 00:05:29,580 OK so now let's actually create some instance variables for these acads class ok. 90 00:05:29,900 --> 00:05:32,580 Private fine on 91 00:05:35,350 --> 00:05:37,700 NKT number of Lex 92 00:05:41,700 --> 00:05:50,670 ocelli private boolean can hunt other animals. 93 00:05:50,690 --> 00:05:51,200 OK. 94 00:05:51,380 --> 00:05:55,500 And boolean variables can only hold a true value or a false value. 95 00:05:55,500 --> 00:06:00,070 OK so the name of my variable is Chantant other animals. 96 00:06:00,080 --> 00:06:06,040 So now let's actually create a constructor in order to initialize these instance variables here. 97 00:06:06,090 --> 00:06:14,390 OK so first in order to create a constructor I need to actually specify the access modifier of my constructor 98 00:06:14,390 --> 00:06:15,910 first public. 99 00:06:16,100 --> 00:06:22,010 And then I need to give a name to my constructor so the name of my constructor must be the same as the 100 00:06:22,010 --> 00:06:23,290 name of this cat class. 101 00:06:23,300 --> 00:06:23,810 OK. 102 00:06:23,990 --> 00:06:31,250 So public chats and then I put in a Around two decades after my constructor name. 103 00:06:31,400 --> 00:06:36,290 And then I actually opened and closed my constructor by using these curly braces. 104 00:06:36,290 --> 00:06:36,790 OK. 105 00:06:37,010 --> 00:06:42,740 So inside the Prentice's I want to actually specify that my constructor is going to accept arguments. 106 00:06:42,820 --> 00:06:47,680 OK so the first sort the data type of the first argument is a three. 107 00:06:48,320 --> 00:06:59,700 The name of my argument is name comma as strange caller comma int amount of speed. 108 00:07:00,910 --> 00:07:05,600 Comma in and out of power comma. 109 00:07:06,430 --> 00:07:09,490 Ain't number of legs. 110 00:07:09,670 --> 00:07:16,250 Come on Boullion can hunt other animals OK. 111 00:07:16,760 --> 00:07:18,770 Inside the constructor. 112 00:07:18,790 --> 00:07:21,450 Let's actually initialize these instance variables. 113 00:07:21,500 --> 00:07:27,780 So inside the constructor in order to refer to this named instance variable I just type in here this 114 00:07:28,280 --> 00:07:32,860 dot name assignment operator name. 115 00:07:33,210 --> 00:07:33,930 OK. 116 00:07:34,280 --> 00:07:40,910 These dot color assignments operator color. 117 00:07:41,610 --> 00:07:42,250 OK. 118 00:07:42,380 --> 00:07:48,620 So as you can see here this name here refers to this named instance variable and this name here refers 119 00:07:48,890 --> 00:07:50,850 to this name argument here. 120 00:07:50,870 --> 00:07:58,280 Ok to this argument and this color refers to this color instance variable here and this color refers 121 00:07:58,400 --> 00:08:00,140 to this argument here. 122 00:08:00,140 --> 00:08:00,780 OK. 123 00:08:01,100 --> 00:08:03,980 So that's why we actually put this key vote here. 124 00:08:04,030 --> 00:08:07,310 Does that color this refers to this class. 125 00:08:07,400 --> 00:08:22,460 Ok so at this dot amount of speed assignment operator amount of speed does that amount of power assignment 126 00:08:22,490 --> 00:08:24,530 operator amount of power. 127 00:08:24,600 --> 00:08:26,030 OK. 128 00:08:26,050 --> 00:08:31,360 Again these that number of legs. 129 00:08:32,140 --> 00:08:44,350 Assignment operator number of legs these that can hunt other animals assignments operator can hunt other 130 00:08:44,350 --> 00:08:44,820 animals. 131 00:08:44,830 --> 00:08:46,030 OK. 132 00:08:46,510 --> 00:08:51,210 So as you can see here I initialized this instance variables here. 133 00:08:51,550 --> 00:08:52,130 OK. 134 00:08:52,210 --> 00:08:58,200 So now you might actually create some getters and setters for actualities instance variables. 135 00:08:58,240 --> 00:08:58,820 OK. 136 00:08:59,140 --> 00:09:05,350 So now you want to actually show you a trick in order to generate the get here and setters automatically 137 00:09:05,350 --> 00:09:06,220 OK. 138 00:09:06,370 --> 00:09:15,870 So actually our Right-Click outside of this constructor right click here and then go to generate click 139 00:09:15,870 --> 00:09:21,320 and generate and then click on get her and set her on. 140 00:09:21,340 --> 00:09:24,610 As you can see here we've got this instance variables here. 141 00:09:24,610 --> 00:09:31,550 OK this name instance variable color instance variable amount of speed instance variable amount of power 142 00:09:31,560 --> 00:09:38,710 instance variable number of legs instance variable and this can't can hunt other animals instance variable 143 00:09:38,980 --> 00:09:40,020 which is of type float. 144 00:09:40,030 --> 00:09:40,630 OK. 145 00:09:40,960 --> 00:09:47,530 So if I actually select all of these instance variables here by holding on command key on my keyboard 146 00:09:47,830 --> 00:09:51,670 and then clicking on these for instance variables. 147 00:09:51,670 --> 00:09:56,230 If you are using a Windows machine you need to actually hold the control key on your keyboard and then 148 00:09:56,230 --> 00:10:01,470 select all of these instance variables OK and then click on OK. 149 00:10:01,690 --> 00:10:08,560 So as you can see here are the Android studio automatically generated getters and setters for my instance 150 00:10:08,560 --> 00:10:09,110 variables. 151 00:10:09,130 --> 00:10:09,540 OK.