1 00:00:00,900 --> 00:00:06,690 And let's actually go inside this main activity that you have a fight here and now let's actually create 2 00:00:06,780 --> 00:00:15,660 an object from this vehicle class and the name of this vehicle can be my vehicle and then I put in an 3 00:00:15,660 --> 00:00:19,880 assignment operator new vehicle. 4 00:00:20,460 --> 00:00:21,120 OK. 5 00:00:21,240 --> 00:00:24,900 So here we need to actually passing some values. 6 00:00:24,900 --> 00:00:30,960 First of all I need to actually passing the value of the speed so valuable the value of the speed of 7 00:00:30,960 --> 00:00:32,200 this my vehicle object. 8 00:00:32,200 --> 00:00:37,060 For example 45 karma has braking system. 9 00:00:37,060 --> 00:00:43,370 True karma and number of wheels for example. 10 00:00:43,410 --> 00:00:44,040 Fourth. 11 00:00:44,270 --> 00:00:44,860 OK. 12 00:00:45,090 --> 00:00:48,560 And then I put in a semi-colon at the end of my statement. 13 00:00:48,570 --> 00:00:52,200 Now I want to actually output these values to the screen. 14 00:00:52,470 --> 00:00:59,400 So first of all we need to actually create Smurfette in order to allow us to put these values to the 15 00:00:59,400 --> 00:01:00,010 screen. 16 00:01:00,240 --> 00:01:06,030 So let's actually overwrite the twisting method that you actually to inherit from the Object class. 17 00:01:06,030 --> 00:01:06,720 OK. 18 00:01:07,200 --> 00:01:12,840 So I just need to refer to the name of this twittering Merfeld and here as you can see it says return's 19 00:01:12,840 --> 00:01:14,210 superb that was 3M. 20 00:01:14,430 --> 00:01:20,070 So I don't want to actually execute the implementations that are inside the twisting Meffert inside 21 00:01:20,070 --> 00:01:20,850 the Object class. 22 00:01:20,860 --> 00:01:21,730 OK. 23 00:01:21,960 --> 00:01:24,170 This super refers to the object class. 24 00:01:24,210 --> 00:01:30,690 So I don't want to actually execute those implementations that are inside these two or three Meffert 25 00:01:30,750 --> 00:01:32,870 inside the inside the object class. 26 00:01:32,880 --> 00:01:33,600 OK. 27 00:01:34,020 --> 00:01:36,460 So let's actually delete this line of code here. 28 00:01:36,750 --> 00:01:40,580 So here inside the Smurfette I can just type in return. 29 00:01:40,680 --> 00:01:50,670 Strange that format and first of all I need to actually specify the formatting instructions of this 30 00:01:50,820 --> 00:01:51,510 object. 31 00:01:51,630 --> 00:01:52,400 OK. 32 00:01:52,760 --> 00:01:53,490 Percent. 33 00:01:53,680 --> 00:01:55,580 As comma. 34 00:01:56,020 --> 00:02:00,360 And now I need to actually specify the speed of instance variable. 35 00:02:00,730 --> 00:02:02,320 So percent the. 36 00:02:02,670 --> 00:02:05,380 And again percent as comma. 37 00:02:05,730 --> 00:02:09,790 Now I want to actually specify the has braking system in sense valuable. 38 00:02:10,080 --> 00:02:16,410 So percent B and again percent as comma. 39 00:02:16,900 --> 00:02:22,080 And now we want to actually specify the number of Veals instance variable. 40 00:02:22,400 --> 00:02:25,540 So percent D. 41 00:02:26,120 --> 00:02:31,850 And again we have another instance variable right speed which is of type integer. 42 00:02:32,180 --> 00:02:36,800 So here I can just type in percent as comma percent D. 43 00:02:37,210 --> 00:02:37,780 OK. 44 00:02:37,880 --> 00:02:42,910 So now I want to actually refer to these instance variables. 45 00:02:42,950 --> 00:02:50,270 So remember that I said in this earlier in this tutorial always use getters and setters in order to 46 00:02:50,270 --> 00:02:56,860 mislead manipulate the value of your instance variables even if you are using them in your own class. 47 00:02:57,080 --> 00:03:03,330 OK so now I can actually access these instance variables by using these get here as Meffert. 48 00:03:03,350 --> 00:03:03,810 OK. 49 00:03:03,890 --> 00:03:10,330 So here I can actually put in some arguments in order to relate those arguments to these talking. 50 00:03:10,400 --> 00:03:10,990 OK. 51 00:03:11,180 --> 00:03:14,370 So for the first token I need to actually put in a string value. 52 00:03:14,570 --> 00:03:22,900 So I just put it into double quotes here and again just typing speed ok karma. 53 00:03:23,540 --> 00:03:29,690 And now I need to actually put up an argument of type integer so I can just refer to the name of this 54 00:03:29,690 --> 00:03:32,670 good speed method. 55 00:03:32,720 --> 00:03:39,480 And again I need to actually put in a string value here has braking system so I can just type in up 56 00:03:39,620 --> 00:03:47,070 can break and come up and here I need to actually putting in an argument of type Boolean. 57 00:03:47,300 --> 00:03:48,840 So I can just put in. 58 00:03:48,890 --> 00:03:54,630 So I can't just refer to the name of that gets has breaking system comma. 59 00:03:54,950 --> 00:04:03,370 Let's actually create a new line here and now I need to actually again putting a value of type string. 60 00:04:03,630 --> 00:04:13,700 Ok so I just put it into double quotes and then inside the double quotes I can't just put in a value 61 00:04:13,700 --> 00:04:14,470 of type string. 62 00:04:14,510 --> 00:04:20,440 Ok so a number of violists number of wheels. 63 00:04:21,080 --> 00:04:22,880 OK come on. 64 00:04:23,190 --> 00:04:30,440 And now I can actually refer to the name of this get number of veal Smurfit OK good number of years 65 00:04:30,980 --> 00:04:31,750 comma. 66 00:04:31,910 --> 00:04:35,450 And again we have these percent as talking here. 67 00:04:35,750 --> 00:04:42,170 So I can't just put into double quotes and then in a set of double quotes I can just refer a value of 68 00:04:42,170 --> 00:04:42,870 type string. 69 00:04:42,920 --> 00:04:46,260 So for this right speed instance variable. 70 00:04:46,400 --> 00:04:49,890 So I can just type in right speed. 71 00:04:50,280 --> 00:04:55,140 Ok comma gets right speed. 72 00:04:55,760 --> 00:04:59,150 And then I put in a semi-colon at the end of this method. 73 00:04:59,180 --> 00:04:59,730 OK. 74 00:05:00,570 --> 00:05:02,800 So hopefully that makes sense. 75 00:05:02,850 --> 00:05:06,220 And let's actually go back inside this main activity that you are here. 76 00:05:06,480 --> 00:05:12,710 First we need to actually create some objects from the text your class so I can just type in here text 77 00:05:12,740 --> 00:05:16,780 you the name of this text is TXI the vehicle. 78 00:05:16,950 --> 00:05:17,590 OK. 79 00:05:17,820 --> 00:05:24,720 And then I put an assignment operator here and then I need to actually cast this object to a text you 80 00:05:25,200 --> 00:05:32,820 find view by ID or that Id dot the X the vehicle. 81 00:05:32,840 --> 00:05:33,750 OK. 82 00:05:33,930 --> 00:05:36,800 And then I need to put in a semi-colon at the end of my statement. 83 00:05:36,990 --> 00:05:43,620 So now I can actually refer to the name of the vehicle object that said text. 84 00:05:43,620 --> 00:05:50,200 And that inside Apprentice's I can just refer to the name of this mine my vehicle object that has three. 85 00:05:50,600 --> 00:05:51,430 OK. 86 00:05:51,780 --> 00:05:53,910 So hopefully that makes sense. 87 00:05:53,940 --> 00:05:57,570 And now let's actually run our project and see what happens. 88 00:05:57,570 --> 00:06:03,300 So as you can see here these are the values that are actually outputted to the screen or shape. 89 00:06:03,420 --> 00:06:08,660 So speed 45 as you can see here and can break through. 90 00:06:08,900 --> 00:06:09,880 OK. 91 00:06:09,900 --> 00:06:13,410 Number Aviles four and right speed zero. 92 00:06:13,440 --> 00:06:21,450 And now you may wonder why the value of this right speed variable is zero because we actually created 93 00:06:22,050 --> 00:06:25,630 an instant Smurfette inside this vehicle class here. 94 00:06:25,680 --> 00:06:26,550 OK. 95 00:06:26,970 --> 00:06:27,630 Right. 96 00:06:28,020 --> 00:06:31,440 But we didn't actually call the Smurfette on our object. 97 00:06:31,440 --> 00:06:31,900 OK. 98 00:06:31,920 --> 00:06:33,460 On our vehicle object. 99 00:06:33,480 --> 00:06:40,290 So before we actually want to output these values to the screen before this line of code as you can 100 00:06:40,290 --> 00:06:44,160 see here we can actually call that Smurfette on this vehicle object. 101 00:06:44,160 --> 00:06:46,830 So first I need to actually first with the name of this object. 102 00:06:46,830 --> 00:06:48,310 That's right. 103 00:06:48,870 --> 00:06:49,630 OK. 104 00:06:50,010 --> 00:06:56,960 And now it's going to actually assign some value to the right speed instance variable. 105 00:06:56,970 --> 00:06:57,470 OK. 106 00:06:57,570 --> 00:07:00,840 So let's actually run our project and see what happens. 107 00:07:00,840 --> 00:07:06,750 So as you can see here now the value of this road speed variable is one hundred and eighty. 108 00:07:06,750 --> 00:07:07,160 OK. 109 00:07:07,230 --> 00:07:09,150 So hopefully that makes sense. 110 00:07:09,150 --> 00:07:12,890 Now let's actually go ahead and work on this car class. 111 00:07:12,900 --> 00:07:13,520 OK. 112 00:07:13,590 --> 00:07:21,780 So now for example suppose that we don't have any specific characteristics that are going to be related 113 00:07:21,840 --> 00:07:22,890 only to this car class. 114 00:07:22,890 --> 00:07:23,300 OK. 115 00:07:23,370 --> 00:07:29,090 So in this case we can actually create only a constructor for this car class. 116 00:07:29,100 --> 00:07:34,780 So first I need to actually specify the access modifier of this constructor and then I need to actually 117 00:07:34,780 --> 00:07:37,190 refer to the name of this class car. 118 00:07:37,680 --> 00:07:44,280 And now as you can see inside the prentices we can actually specify some arguments. 119 00:07:44,490 --> 00:07:51,390 So now let's actually specify that this car class actually can inherit all of the features and behaviors 120 00:07:51,690 --> 00:07:53,530 that are inside this vehicle class. 121 00:07:53,550 --> 00:07:54,510 OK. 122 00:07:54,510 --> 00:07:57,880 So here I can just type in extends vehicle. 123 00:07:57,990 --> 00:07:58,740 OK. 124 00:07:59,160 --> 00:08:04,220 So now as you can see here in this our construct that is now showing us an error. 125 00:08:04,530 --> 00:08:05,040 OK. 126 00:08:05,190 --> 00:08:11,280 So we need to actually initialize the constructor that is inside the superclass which is this vehicle 127 00:08:11,290 --> 00:08:11,770 OK. 128 00:08:11,880 --> 00:08:17,130 So let's actually go inside this vehicle class and as you can see here we've got this constructor here 129 00:08:17,640 --> 00:08:23,280 and we need to actually initialize this kind of structure inside this car class. 130 00:08:23,280 --> 00:08:23,880 OK. 131 00:08:24,240 --> 00:08:29,880 So we need to actually passing a value for the speed of value for the HAs braking system and for an 132 00:08:29,910 --> 00:08:34,220 a value for a number of wheels of that specific vehicle or car. 133 00:08:34,280 --> 00:08:35,230 OK. 134 00:08:35,550 --> 00:08:42,030 So inside this car class I can actually specify those arguments in it and the name of this argument 135 00:08:42,030 --> 00:08:43,420 is speed. 136 00:08:43,740 --> 00:08:48,540 Karma Boullion has braking system. 137 00:08:48,630 --> 00:08:50,170 Ok on. 138 00:08:50,410 --> 00:08:55,110 End number of wheels. 139 00:08:55,650 --> 00:08:56,470 OK. 140 00:08:56,760 --> 00:09:02,480 So now I can actually initialize the constructor of the superclass by just passing these values. 141 00:09:02,490 --> 00:09:06,170 Speed camera has braking system. 142 00:09:06,270 --> 00:09:06,980 Come on. 143 00:09:07,170 --> 00:09:08,420 Number of wheels. 144 00:09:08,430 --> 00:09:09,010 OK. 145 00:09:09,210 --> 00:09:13,880 And as you can see here we don't have any instance variable related to this car class. 146 00:09:13,890 --> 00:09:14,400 OK. 147 00:09:14,490 --> 00:09:20,280 I can actually overwrite the two string method that we are actually inheriting from this vehicle class 148 00:09:20,730 --> 00:09:22,930 so I can just take in here too strange. 149 00:09:23,370 --> 00:09:29,310 And then it can actually execute the implementations that are inside these two string Mefford inside 150 00:09:29,310 --> 00:09:30,610 this vehicle class. 151 00:09:30,630 --> 00:09:31,250 OK. 152 00:09:31,530 --> 00:09:36,280 So super refers to this vehicle class that was three in the first with this method. 153 00:09:36,510 --> 00:09:42,120 And then it can actually go inside the Smurfette and then it's gonna execute this line of code here. 154 00:09:42,120 --> 00:09:42,600 OK. 155 00:09:42,750 --> 00:09:47,910 So hopefully that makes sense and then it's actually going inside this main activity that over here 156 00:09:48,180 --> 00:09:53,180 and now I can actually create an object from this car class. 157 00:09:53,460 --> 00:09:54,290 OK. 158 00:09:54,780 --> 00:10:04,970 And the name of my car object is my car and the puts an assignment operator here new caught. 159 00:10:05,340 --> 00:10:05,940 OK.