1 00:00:00,120 --> 00:00:03,500 But as you know a lion is actually an animal. 2 00:00:03,510 --> 00:00:03,960 OK. 3 00:00:04,110 --> 00:00:10,740 So I can actually inherit all of the features and behaviors that are actually inside of the Animal class 4 00:00:10,950 --> 00:00:13,340 so extends animal here. 5 00:00:13,860 --> 00:00:21,000 And these are the instance variables that are specific only to display in class privates Boullion can 6 00:00:21,000 --> 00:00:22,010 fight too. 7 00:00:22,080 --> 00:00:23,170 OK. 8 00:00:23,250 --> 00:00:24,450 And here I created. 9 00:00:24,450 --> 00:00:32,220 I actually did declare an instance variable private int fighting power and as you can see here I didn't 10 00:00:32,280 --> 00:00:35,640 instantiate this instance variable here. 11 00:00:35,640 --> 00:00:36,420 OK. 12 00:00:36,420 --> 00:00:40,960 Now let's actually create a constructor for this like in class here. 13 00:00:41,060 --> 00:00:45,930 OK so now I'm going to have truly pasting this constructive and then I'm going to explain to you what's 14 00:00:45,930 --> 00:00:47,100 going on here. 15 00:00:47,550 --> 00:00:51,150 So as you can see here this is the constructor that I actually pasted here. 16 00:00:51,330 --> 00:00:51,950 OK. 17 00:00:52,530 --> 00:00:58,470 And here you can see that as you can see the Axis modifier of this kind of structure is public. 18 00:00:58,740 --> 00:01:03,160 The name of this constructor must be the same as the name of this class. 19 00:01:03,220 --> 00:01:03,990 OK. 20 00:01:04,290 --> 00:01:08,900 And here as you can see this constructor actually accepts some arguments. 21 00:01:08,900 --> 00:01:13,800 Ok the first argument is of types 3 an animal name. 22 00:01:13,800 --> 00:01:16,270 The second argument is of type against string. 23 00:01:16,590 --> 00:01:19,940 Animal color into power in speed. 24 00:01:20,190 --> 00:01:23,130 And here as you can see Boullion can fight. 25 00:01:23,210 --> 00:01:23,750 OK. 26 00:01:24,030 --> 00:01:26,150 And it fighting power. 27 00:01:26,460 --> 00:01:31,620 So here because we are actually inheriting all of the features and behaviors that are inside of this 28 00:01:31,620 --> 00:01:38,790 animal class we need to call it actually the constructor of the superclass or Keaveney to actually initialize 29 00:01:39,150 --> 00:01:41,000 the constructor of the superclass. 30 00:01:41,010 --> 00:01:42,090 So as you can see here. 31 00:01:42,120 --> 00:01:43,040 Super. 32 00:01:43,220 --> 00:01:43,790 OK. 33 00:01:43,910 --> 00:01:47,520 See this super actually refers to the superclass animal. 34 00:01:47,630 --> 00:01:51,900 OK here you want to initialize the constructor of the superclass. 35 00:01:51,900 --> 00:01:52,210 OK. 36 00:01:52,260 --> 00:01:54,350 So super animal name. 37 00:01:54,540 --> 00:01:55,090 OK. 38 00:01:55,380 --> 00:02:01,200 So this animal name as you can see animal inside of the Animal class we have this constructor here. 39 00:02:01,200 --> 00:02:01,580 OK. 40 00:02:01,710 --> 00:02:08,100 So this constructor as you can see the first argument that this animal constructed actually accepts 41 00:02:08,400 --> 00:02:10,420 is of type strange animal name. 42 00:02:10,470 --> 00:02:10,900 OK. 43 00:02:10,980 --> 00:02:14,110 So inside of this lion class I am actually assigning. 44 00:02:14,120 --> 00:02:20,490 That's why you here to that to that instance variable that is inside this animal here inside of these 45 00:02:20,790 --> 00:02:21,870 Animal class. 46 00:02:21,900 --> 00:02:22,330 OK. 47 00:02:22,410 --> 00:02:30,510 So like an animal named animal color as you can see here power and speed here. 48 00:02:30,720 --> 00:02:36,590 And these are these two instance variables as you can see here these can fight in Cincinnati. 49 00:02:36,870 --> 00:02:42,800 And these fighting power is actually these are actually specific only through this low class sort of 50 00:02:42,810 --> 00:02:45,680 chant fight and fight in power here as you can see. 51 00:02:45,810 --> 00:02:49,400 First of all I created an if statement here. 52 00:02:49,500 --> 00:02:49,970 OK. 53 00:02:50,040 --> 00:02:52,950 If the value of this fighting power. 54 00:02:53,200 --> 00:03:01,290 OK if the value of the swanking power arguments is less than or equal to number 0 then of throw on you 55 00:03:01,560 --> 00:03:08,940 actually exception for new argument exception the value of the argument the power must be greater than 56 00:03:09,150 --> 00:03:11,550 number zero as you can see here. 57 00:03:11,610 --> 00:03:12,060 OK. 58 00:03:12,060 --> 00:03:19,320 And here as you can see I am instantiating these actually these instance variables these that can fight 59 00:03:19,530 --> 00:03:26,000 assignment operator can fight the start fighting power assignments operator fighting and power. 60 00:03:26,010 --> 00:03:33,190 OK so now let's actually create some are getters and setters for these instance variables. 61 00:03:33,210 --> 00:03:40,140 So here inside of this class I just would like to click here and then you can generate and then click 62 00:03:40,140 --> 00:03:47,380 can get here and sit here and here choose these two instance variables and then click on OK here. 63 00:03:47,430 --> 00:03:53,880 So as you can see here these are my instant actually these are my getters and setters for these two 64 00:03:53,880 --> 00:03:59,640 instance variables as you can see here up is can fight said can fight. 65 00:03:59,670 --> 00:04:02,880 So I don't like this name here is can't fight. 66 00:04:02,880 --> 00:04:06,730 So I just did it this is here and I can just type in jets. 67 00:04:07,010 --> 00:04:12,310 Gays can fight so it can fight get fighting power and set fighting power. 68 00:04:12,390 --> 00:04:12,750 OK. 69 00:04:12,780 --> 00:04:20,580 Let's actually up to calculate Meffert as you can see we have another addendum if you calculate the 70 00:04:20,580 --> 00:04:23,110 overall power of animal method here. 71 00:04:23,130 --> 00:04:28,860 So because this lion class actually inherits all of the features and behaviors that are actually inside 72 00:04:28,860 --> 00:04:34,370 of this animal class I can override that method here so I can just I can calculate. 73 00:04:34,530 --> 00:04:39,960 And as you can see I can refer to the name of that method here and that if I press enter here on my 74 00:04:39,960 --> 00:04:42,720 keyboard now you can see this left here. 75 00:04:42,870 --> 00:04:45,710 It calculates the overall power of any man. 76 00:04:45,990 --> 00:04:51,880 And here as you can see it says Return superior that calculate the overall power of any man. 77 00:04:52,050 --> 00:04:59,740 So again just put a A-plus operator here and then I'm going to actually putting the fighting power here. 78 00:05:00,030 --> 00:05:05,810 In power as you can see here this superhero actually refers to the name of the superclass animal. 79 00:05:06,100 --> 00:05:12,970 This calculates the overall power of animal if it actually is going to execute this line of code here 80 00:05:13,390 --> 00:05:17,940 gives animal power multiplied by the value of the animal speed. 81 00:05:18,340 --> 00:05:22,820 And then I am actually adding the value of this fighting power to that value. 82 00:05:22,840 --> 00:05:23,370 OK. 83 00:05:23,500 --> 00:05:26,750 And then I am returning that value to the call to the call of the spec for it. 84 00:05:26,770 --> 00:05:32,820 OK so now let's actually override the two string method that is inside of the superclass of this in 85 00:05:32,840 --> 00:05:33,540 class. 86 00:05:33,760 --> 00:05:36,580 So I can just say two three. 87 00:05:37,240 --> 00:05:40,980 And as you can see here it says is written superdad to strange here. 88 00:05:41,020 --> 00:05:41,420 OK. 89 00:05:41,440 --> 00:05:46,680 So let's actually delete this line of code here and here it's actually type router. 90 00:05:47,230 --> 00:05:53,380 OK strange that format an insert of the Prentice's of this format. 91 00:05:53,390 --> 00:05:57,940 And when I tried putting a piece of code here and then I'm going to explain to you what's going on here. 92 00:05:57,980 --> 00:06:01,820 So the double quotes as you can see the percept is OK. 93 00:06:02,020 --> 00:06:06,360 So this person is actually refers to this argument Super 8 that was three. 94 00:06:06,520 --> 00:06:10,310 So as you know super refers to the name of the superclass animal. 95 00:06:10,450 --> 00:06:15,040 And this truthtelling Meffert actually refers to this implementation that is actually the inside of 96 00:06:15,040 --> 00:06:19,020 this two string Meffert that is inside of this superclass animal. 97 00:06:19,060 --> 00:06:19,540 OK. 98 00:06:19,660 --> 00:06:23,200 So it's going to execute these lines of code here in that format. 99 00:06:23,290 --> 00:06:23,700 OK. 100 00:06:23,770 --> 00:06:29,720 And then it's going to return the value of the animal name animal color animal power at animal speed. 101 00:06:29,920 --> 00:06:30,310 OK. 102 00:06:30,310 --> 00:06:35,200 Inside of the lion close as you can see here that's actually putting a semicolon here at the end of 103 00:06:35,230 --> 00:06:36,580 our statement. 104 00:06:36,640 --> 00:06:38,630 So that now the arrow is gone. 105 00:06:38,620 --> 00:06:45,460 And here we have a new line character percent and and I have a person and another person is here as 106 00:06:45,460 --> 00:06:46,140 you can see. 107 00:06:46,270 --> 00:06:50,440 So this position here is for this chan are like a fight. 108 00:06:50,540 --> 00:06:51,720 OK this is strange. 109 00:06:51,800 --> 00:06:56,010 Colin and I have asked this person to be here. 110 00:06:56,020 --> 00:07:00,460 So this person's appeal is for this catfight valuable. 111 00:07:00,580 --> 00:07:01,000 OK. 112 00:07:01,030 --> 00:07:05,180 So as you can see here this is not the best way to write our coats here. 113 00:07:05,210 --> 00:07:13,570 I should actually be fair to the name of the Get can fight method here in order to return the value 114 00:07:13,570 --> 00:07:14,940 of these are. 115 00:07:14,950 --> 00:07:15,600 Chan fight. 116 00:07:15,600 --> 00:07:16,150 Ready. 117 00:07:16,180 --> 00:07:16,730 OK. 118 00:07:16,990 --> 00:07:18,820 So this person is what this gets. 119 00:07:18,890 --> 00:07:26,590 Can't fight left here and another nearby character person in and behalf of another person is here. 120 00:07:26,620 --> 00:07:31,550 So he's talking in his 40s value the fighting power of our lion ears. 121 00:07:31,790 --> 00:07:32,150 OK. 122 00:07:32,150 --> 00:07:33,020 Person. 123 00:07:33,160 --> 00:07:37,270 So this person is for this instance variable fighting power. 124 00:07:37,360 --> 00:07:41,930 So here again this is not the best way in order to write Ancoats here. 125 00:07:41,980 --> 00:07:45,470 I should just refer to the name of the kids fighting power. 126 00:07:45,570 --> 00:07:46,160 OK. 127 00:07:46,540 --> 00:07:53,110 Kids fighting power and here is going to return the value of these fighting power instance variable 128 00:07:53,110 --> 00:07:53,670 OK. 129 00:07:54,160 --> 00:07:59,170 So now let's actually go back and say this main activity that Javal fight here and here inside that 130 00:07:59,200 --> 00:08:03,190 this uncreate Somerford that's actually putting some more lines of code here. 131 00:08:03,190 --> 00:08:09,940 So now inside of this uncreate Meffert Let's actually create some objects from the Take take a class. 132 00:08:09,940 --> 00:08:15,060 So as you can see here I actually created Freep objects from these text class. 133 00:08:15,070 --> 00:08:15,550 OK. 134 00:08:15,730 --> 00:08:18,150 The first object is to the animal. 135 00:08:18,370 --> 00:08:25,030 And here you referred to the name of this idea or that idea that the animal and the second object is 136 00:08:25,630 --> 00:08:26,450 the lion. 137 00:08:26,470 --> 00:08:33,300 And here I referred to the name of this ID or that idea that takes the lion and does the first argument 138 00:08:33,640 --> 00:08:37,420 as you can see the first object is the polymorphism. 139 00:08:37,450 --> 00:08:41,880 And here I referred to the name of this ITTL the polymorphism here. 140 00:08:41,950 --> 00:08:44,620 OK let's actually put some more lines of code here. 141 00:08:44,620 --> 00:08:53,980 So here I want to actually create two objects one object from this animal class and another object from 142 00:08:53,980 --> 00:08:54,970 the lion class. 143 00:08:54,970 --> 00:08:55,540 OK. 144 00:08:55,750 --> 00:09:01,730 So as you can see here these are my two objects anemone and the name of this object is animal. 145 00:09:01,780 --> 00:09:05,820 And here I am actually instantiating this object here. 146 00:09:06,100 --> 00:09:11,500 And as you can see I am passing some values to the constructor of this animal class the name of this 147 00:09:11,560 --> 00:09:15,590 animal is where the color of this animal is black. 148 00:09:15,940 --> 00:09:20,860 And here as you can see I assigned an invalid number to these animal power. 149 00:09:20,980 --> 00:09:26,930 And again I actually assigned an invalid numbers to this animal species. 150 00:09:27,040 --> 00:09:27,630 OK. 151 00:09:27,880 --> 00:09:34,560 And then here I actually created an object from the lion class and the name of this object is a lion. 152 00:09:34,600 --> 00:09:40,450 And then I actually assigned somebody used to the constructor of this lion class as you can see here. 153 00:09:40,480 --> 00:09:45,180 And the name of this lion is my lion the color of this lion is yellow. 154 00:09:45,340 --> 00:09:51,530 And here as you can see for the animal power I have actually assigned an invalid number and he had for 155 00:09:51,530 --> 00:09:54,950 the animal split again I assigned an invalid number. 156 00:09:54,960 --> 00:10:03,120 Number negative one and he had this value as you can see inside of this lion class this value here it 157 00:10:03,120 --> 00:10:05,030 can fight boolean variable. 158 00:10:05,190 --> 00:10:10,200 So here inside of this our main activity that I will find here you can see that I assigned a value of 159 00:10:10,200 --> 00:10:17,280 true for the can fight instance variable of this object and this number here one hundred and seventy 160 00:10:17,670 --> 00:10:20,100 is for these fighting power here. 161 00:10:20,190 --> 00:10:20,560 OK. 162 00:10:20,580 --> 00:10:24,280 So inside of this main activity that over here I created these two objects.