1 00:00:00,470 --> 00:00:03,300 And this is that this is more professional. 2 00:00:03,690 --> 00:00:09,390 And now let's actually override the twisting method that you actually inherit from the superclass. 3 00:00:09,540 --> 00:00:11,010 So what is the superclass. 4 00:00:11,010 --> 00:00:11,970 In this case. 5 00:00:11,970 --> 00:00:19,890 So as you know all classes in Java are explicitly or implicitly inherits all of the features and behaviors 6 00:00:19,890 --> 00:00:21,930 that are inside of the Object class. 7 00:00:21,960 --> 00:00:24,780 So he has this student student class as you can see here. 8 00:00:25,110 --> 00:00:30,750 Implicitly inherits all of the features and behaviors that are inside of the Object class. 9 00:00:30,750 --> 00:00:37,790 So here again just typing to string and here let's actually delete this line of code that are actually 10 00:00:37,800 --> 00:00:41,370 inside that is inside of these two string method. 11 00:00:41,370 --> 00:00:45,940 And now we can actually put in our own implementations inside of this posting method. 12 00:00:45,960 --> 00:00:51,090 Now I'm going to actually pasting a line of code here and then I'm going to explain to you what's going 13 00:00:51,090 --> 00:00:51,530 on here. 14 00:00:51,540 --> 00:00:51,900 OK. 15 00:00:51,930 --> 00:00:57,660 So here I am saying the return string data format and inside it up course as you can see I am specifying 16 00:00:57,660 --> 00:01:00,090 the formats of my string value. 17 00:01:00,120 --> 00:01:01,440 So this up. 18 00:01:01,440 --> 00:01:05,610 So this person as you can see here is for this name here as you can see. 19 00:01:05,610 --> 00:01:07,660 So a person as called space. 20 00:01:07,830 --> 00:01:11,980 And we have another person is here this tokin is for these kids name it. 21 00:01:12,030 --> 00:01:12,720 OK. 22 00:01:13,020 --> 00:01:14,920 And we have a person here. 23 00:01:15,030 --> 00:01:18,300 So this person is actually a newline character. 24 00:01:18,330 --> 00:01:18,840 OK. 25 00:01:18,950 --> 00:01:21,020 If we have another person here. 26 00:01:21,120 --> 00:01:24,250 So this person is for this course name here. 27 00:01:24,280 --> 00:01:25,100 OK. 28 00:01:25,430 --> 00:01:27,770 Call in space. 29 00:01:27,900 --> 00:01:33,220 And we have another person here and this person S is for this good course name here. 30 00:01:33,250 --> 00:01:39,780 OK so now let's actually go back inside this main activity that double file here and inside of these 31 00:01:40,170 --> 00:01:43,130 uncreate if it is actually putting our own coats here. 32 00:01:43,140 --> 00:01:43,530 OK. 33 00:01:43,620 --> 00:01:50,790 So first of all let's actually create an object from the text view class here as you can see here. 34 00:01:50,790 --> 00:01:53,950 I am actually creating an object from this textbook class. 35 00:01:53,970 --> 00:02:00,760 The polymorphism assignment operator and here I am saying find view by id r that ID data takes the polymorphism. 36 00:02:00,760 --> 00:02:09,090 OK so now let's actually create an array of type of life insurance objects as you can see here. 37 00:02:09,210 --> 00:02:13,860 This is a life insurance interface and inside of this main activity that have a fight and inside of 38 00:02:13,860 --> 00:02:18,600 this uncreate Smurfette all you want to actually create an array of type life insurance. 39 00:02:18,610 --> 00:02:23,460 So now I'm going to pasting some lines of code here and then I'm going to explain to you what's going 40 00:02:23,460 --> 00:02:24,390 on here. 41 00:02:24,930 --> 00:02:31,530 So here as you can see here first of all in 1919 I actually specify that I want to actually create an 42 00:02:31,530 --> 00:02:38,520 array of type life insurance as you can see the name the name of this era is life insurance's assignment 43 00:02:38,550 --> 00:02:39,180 operator. 44 00:02:39,270 --> 00:02:46,920 And here I want to instantiate this array by saying that this area can actually accept free objects 45 00:02:46,980 --> 00:02:48,570 of type life insurance. 46 00:02:48,570 --> 00:02:49,030 OK. 47 00:02:49,060 --> 00:02:54,380 And I agree that Chantry fair two are actually life insurance objects. 48 00:02:54,390 --> 00:02:54,790 OK. 49 00:02:54,870 --> 00:02:57,060 So the size of this area is free. 50 00:02:57,300 --> 00:02:58,560 OK. 51 00:02:58,570 --> 00:03:04,500 And here in line 20 as you can see for the index zero of this are a life insurance. 52 00:03:04,660 --> 00:03:06,290 You want to assign a value. 53 00:03:06,330 --> 00:03:06,900 OK. 54 00:03:07,170 --> 00:03:14,360 So life insurance is sub index zero assignment operator new student. 55 00:03:14,400 --> 00:03:18,620 So here I want to actually create an otter an object of type student. 56 00:03:18,720 --> 00:03:19,950 New students. 57 00:03:19,950 --> 00:03:26,340 So as you can see here inside of these students class as you can see this class because this class actually 58 00:03:26,430 --> 00:03:30,030 implements this life insurance interface. 59 00:03:30,030 --> 00:03:35,010 There is actually an ease our relationship between these two classes. 60 00:03:35,010 --> 00:03:38,150 So student is our life insurance. 61 00:03:38,160 --> 00:03:38,400 OK. 62 00:03:38,400 --> 00:03:45,570 There is actually an is a relationship between these two between these student class and this life insurance 63 00:03:45,780 --> 00:03:46,640 interface. 64 00:03:46,770 --> 00:03:53,080 That is and is our relationship between these two this student class and these are life insurance. 65 00:03:53,280 --> 00:03:53,970 OK. 66 00:03:54,210 --> 00:04:00,030 So let's go back inside the main activity that I will fight here and here I created an object of type 67 00:04:00,030 --> 00:04:06,260 student and here as you can see the constructor of this class is actually being called named John. 68 00:04:06,330 --> 00:04:08,490 John the name of the student is John. 69 00:04:08,520 --> 00:04:10,340 The course is Andrew devlopment. 70 00:04:10,530 --> 00:04:12,880 And here this is the cost of the life insurance. 71 00:04:12,910 --> 00:04:13,340 OK. 72 00:04:13,430 --> 00:04:20,910 One thousand and here as you can see in line 21 for the index number of one of these are life insurance 73 00:04:20,930 --> 00:04:22,240 is hourly here. 74 00:04:22,350 --> 00:04:24,610 I created an object of type boxing. 75 00:04:24,810 --> 00:04:25,440 OK. 76 00:04:25,440 --> 00:04:31,590 So again as you can see inside of this boxing class this boxing class actually inherits all of the features 77 00:04:31,620 --> 00:04:35,020 and behaviors that are inside of the sport class. 78 00:04:35,040 --> 00:04:35,470 OK. 79 00:04:35,550 --> 00:04:41,860 And this sports class actually implements this a life insurance interface. 80 00:04:41,940 --> 00:04:48,070 So there is actually an is a relationship between displacing and this life insurance interface. 81 00:04:48,180 --> 00:04:48,700 OK. 82 00:04:48,900 --> 00:04:51,620 So let's go back and say this main activity that of a fight here. 83 00:04:51,720 --> 00:04:57,750 He had actually created an object of type boxing and the constructor of boxing is actually being called 84 00:04:57,990 --> 00:05:05,250 Boxing fighting by using only hands boxing uniform and these are the values for this for the constructor 85 00:05:05,250 --> 00:05:06,290 of this boxing class. 86 00:05:06,330 --> 00:05:07,180 OK. 87 00:05:07,590 --> 00:05:13,490 And here for the index number two of these are life insurance as great as you can see here. 88 00:05:13,490 --> 00:05:15,940 I created an object of type kickboxing. 89 00:05:16,080 --> 00:05:21,660 So again because kickboxing actually inherits all of the features and behaviors that are inside of this 90 00:05:21,660 --> 00:05:28,100 boxing class and this boxing class inherits all of the features and behaviors that are inside of this 91 00:05:28,100 --> 00:05:34,290 sport class and this sport class actually implements this life insurance interface. 92 00:05:34,290 --> 00:05:38,010 So this kickboxing and this are life insurance as you can see here. 93 00:05:38,040 --> 00:05:44,560 There is and is our relationship between these kickboxing class and these life insurance interface. 94 00:05:44,580 --> 00:05:49,620 So inside of this main activity that our fight here as you can see I can actually create an object of 95 00:05:49,620 --> 00:05:55,320 type like sync as it can see and hear as you can see the construction of these kickboxing class is being 96 00:05:55,320 --> 00:05:59,810 called kickboxing fighting by punching and kicking kickboxing uniform. 97 00:05:59,820 --> 00:06:04,300 And these are the values for the constructed of these a kickboxing class as you can see here. 98 00:06:04,380 --> 00:06:04,790 OK. 99 00:06:04,890 --> 00:06:09,630 Now I'm going to actually paste in some lines of code here and then I'm going to explain to you what's 100 00:06:09,630 --> 00:06:10,230 going on here. 101 00:06:10,230 --> 00:06:11,300 OK. 102 00:06:11,580 --> 00:06:15,470 So as you can see here these are the lines of code that they actually paste that here. 103 00:06:15,690 --> 00:06:20,100 So first of all in line 29 I actually declared a string variable. 104 00:06:20,100 --> 00:06:24,880 Ok all the polymorphism and then I actually created a for loop. 105 00:06:24,900 --> 00:06:25,350 OK. 106 00:06:25,500 --> 00:06:28,230 So this is actually an enhanced for loop. 107 00:06:28,500 --> 00:06:34,630 And here I want to actually iterate over the values that are inside of this life insurance Aure. 108 00:06:34,840 --> 00:06:35,630 OK. 109 00:06:35,890 --> 00:06:40,790 So life insurance insurance object Colan life insurance says OK. 110 00:06:41,370 --> 00:06:48,230 And inside of this a for loop as you can see here I am instantiating this all the polymorphisms variable 111 00:06:48,350 --> 00:06:55,010 I just referred to the name of this valuable RTX the polymorphisms assignment operator here. 112 00:06:55,040 --> 00:06:59,180 I actually referred to the name of this object that is of type text view. 113 00:06:59,340 --> 00:07:04,330 So take the polymorphous at gettext that get text that are too strange. 114 00:07:04,350 --> 00:07:09,150 Here I am getting the text of this RTX the polymorphous that takes you and I am converting that value 115 00:07:09,150 --> 00:07:10,670 to our string body OK. 116 00:07:10,740 --> 00:07:17,410 And then I am assigning value to this all the polymorphism value but that I actually declared in line 117 00:07:17,650 --> 00:07:21,580 29 and in line 44 as you can see here. 118 00:07:21,690 --> 00:07:25,300 I just referred to the name of this object to the polymorphism. 119 00:07:25,380 --> 00:07:27,790 That said text string data format. 120 00:07:27,870 --> 00:07:32,240 OK all the polymorphism Plus this value OK. 121 00:07:32,340 --> 00:07:38,210 And here I am specifying the format the format of this string value Akkad person s. 122 00:07:38,310 --> 00:07:42,110 So this person s is actually for these insurance object. 123 00:07:42,120 --> 00:07:43,250 The twisting method. 124 00:07:43,410 --> 00:07:49,000 Ok this specific insurance object that is actually inside of this life insurance says Adli. 125 00:07:49,020 --> 00:07:49,490 OK. 126 00:07:49,500 --> 00:07:54,330 So for example for the first time that this is going to be executed. 127 00:07:54,670 --> 00:08:01,960 It's actually the insurance object is the object that is inside of the index zero of this life insurance 128 00:08:02,080 --> 00:08:02,690 rate. 129 00:08:03,030 --> 00:08:03,590 OK. 130 00:08:03,750 --> 00:08:08,290 For example this students and then it's going I should call the twisting Meffert of this. 131 00:08:08,460 --> 00:08:11,730 That is inside of this student class on this object. 132 00:08:11,790 --> 00:08:20,100 And then as you can see here this is there another argument for this format as you can see here we have 133 00:08:20,100 --> 00:08:24,740 person this person and this person is for this argument here. 134 00:08:24,840 --> 00:08:27,650 Life insurance costs colon space. 135 00:08:27,660 --> 00:08:29,080 We have a person here. 136 00:08:29,280 --> 00:08:33,940 So an insurance object that evaluates cost of insurance. 137 00:08:33,960 --> 00:08:40,020 So again you are calling to evaluate cost of insurance method that is specific to they actually object 138 00:08:40,020 --> 00:08:43,710 to the specific object that is inside of this insurance. 139 00:08:43,710 --> 00:08:45,210 Life insurance is free. 140 00:08:45,360 --> 00:08:46,300 OK. 141 00:08:46,440 --> 00:08:52,080 So for the first time that this group is going to be executed an object of type that is going to be 142 00:08:52,080 --> 00:08:53,250 is going to be created. 143 00:08:53,490 --> 00:08:57,830 And this evaluate cost of insurance if it is going to be called on this object. 144 00:08:57,870 --> 00:09:02,460 OK so now let's actually run our project and see what happens. 145 00:09:02,460 --> 00:09:08,610 So here as you can see our application actually crashed and let's go inside this lock here and let's 146 00:09:08,610 --> 00:09:09,920 see what's the error. 147 00:09:09,930 --> 00:09:10,800 OK. 148 00:09:10,800 --> 00:09:18,000 So as you can see here inside of the slug it says Dava that you steal that illegal format's conversion 149 00:09:18,000 --> 00:09:18,770 exception. 150 00:09:18,850 --> 00:09:22,950 Personality cannot format's dotted at length that double. 151 00:09:22,980 --> 00:09:23,520 OK. 152 00:09:23,610 --> 00:09:30,750 So as I said before for double arguments we need to actually use percent f but mistakenly here we use 153 00:09:30,990 --> 00:09:32,110 we use the person D. 154 00:09:32,280 --> 00:09:36,500 So change this person to person F and then run your project again. 155 00:09:36,510 --> 00:09:41,500 So as you can see here now our application is running on these our emulator here. 156 00:09:41,580 --> 00:09:45,550 As you can see it's not named John coarsening Android development. 157 00:09:45,740 --> 00:09:46,220 Life. 158 00:09:46,280 --> 00:09:54,290 Life insurance cost disvalue name boxing rules fighting by using only Hanse uniform boxing uniform Spizz 159 00:09:54,350 --> 00:09:56,750 requires 1000 power required. 160 00:09:56,770 --> 00:09:57,650 Eight hundred. 161 00:09:57,840 --> 00:10:02,750 Punching power required 2000 are punching speed requires 5000. 162 00:10:02,840 --> 00:10:05,240 Life insurance costs are 6000. 163 00:10:05,480 --> 00:10:10,450 And here you can see name kickboxing ludes fighting by punching and kicking. 164 00:10:10,700 --> 00:10:15,970 Uniform kickboxing uniform speeds required 2000 power required. 165 00:10:16,070 --> 00:10:25,400 If I wasn't a punching power required 4000 punching spit required 7000 Keech power required free thousand 166 00:10:25,800 --> 00:10:26,320 and. 167 00:10:26,380 --> 00:10:31,870 It requires 5000 and he had as you can see it says life insurance costs 2000. 168 00:10:31,900 --> 00:10:39,500 OK so as you know inside of this kickboxing class I didn't overwrite this evaluate cost of insurance 169 00:10:39,510 --> 00:10:45,730 Smurfit OK because I actually diskless actually inherits all of the features and behaviors that are 170 00:10:45,720 --> 00:10:47,450 in sight of this boxing class. 171 00:10:48,130 --> 00:10:52,570 And this boxing class actually provided an implementation for that method. 172 00:10:52,630 --> 00:10:56,090 Ok this kickboxing class actually inherits that behavior. 173 00:10:56,090 --> 00:11:02,390 Keep in head is that implementation and as you can see here it says life insurance costs are 2000. 174 00:11:02,510 --> 00:11:04,170 OK as you can see here. 175 00:11:04,620 --> 00:11:11,330 So hopefully that makes sense and if you have any questions please post the discussion in the course 176 00:11:11,750 --> 00:11:14,380 and I'll do my best to answer all of your questions. 177 00:11:14,850 --> 00:11:19,250 And thank you very much for watching and I'll see you in the next section.