1 00:00:00,600 --> 00:00:06,550 And now want to actually output the tutoring method that is related to these objects here. 2 00:00:06,660 --> 00:00:06,970 OK. 3 00:00:06,980 --> 00:00:13,740 So now I want to actually output these objects to the screen by calling them if it was trained on these 4 00:00:13,740 --> 00:00:14,400 objects. 5 00:00:14,430 --> 00:00:15,070 OK. 6 00:00:15,390 --> 00:00:20,550 So here I can just type in the anemone that said text. 7 00:00:21,240 --> 00:00:26,250 And inside the prentices I can just referred to the name of this object anemone. 8 00:00:26,540 --> 00:00:27,110 OK. 9 00:00:27,310 --> 00:00:29,230 That is strange. 10 00:00:29,370 --> 00:00:34,770 So here I want to actually call the twisting method that is inside of this animal class as you can see 11 00:00:34,770 --> 00:00:40,920 we have our twisting my foot here inside of this animal class and here I want to call this method to 12 00:00:40,920 --> 00:00:42,650 this animate object. 13 00:00:42,690 --> 00:00:51,210 And here again I want to type into the lion that sit text and inside the practices of the set text here 14 00:00:51,540 --> 00:00:56,780 I need to refer to the name of this object lion that is three in my faith. 15 00:00:57,000 --> 00:01:03,340 And as you can see here we have our twisting my head actually over right at the Smurfette in say this 16 00:01:03,340 --> 00:01:09,720 like in class and you want to actually call the Smurfette Andi's like an object. 17 00:01:09,720 --> 00:01:12,930 So now let's actually run our project and see what happens. 18 00:01:12,930 --> 00:01:16,490 So now as you can see our application actually crashed. 19 00:01:16,500 --> 00:01:16,940 OK. 20 00:01:17,020 --> 00:01:20,180 Unfortunately I have 27 has stopped. 21 00:01:20,250 --> 00:01:22,520 So let's actually go inside this log here. 22 00:01:22,620 --> 00:01:23,320 OK. 23 00:01:23,730 --> 00:01:33,810 And here as you can see it says that land does illegal argument exception the value of the power must 24 00:01:33,810 --> 00:01:34,980 be greater than zero. 25 00:01:35,070 --> 00:01:41,230 So this is the exception that you actually created here inside this Animal class. 26 00:01:41,250 --> 00:01:47,870 I said that if the value of this power valuable is less than or equal to number 0 then for this legal 27 00:01:47,940 --> 00:01:52,520 argument exception the value of the power must be greater than number 0. 28 00:01:52,860 --> 00:01:57,080 So here this is how actually the exceptions work in your projects. 29 00:01:57,090 --> 00:01:57,460 OK. 30 00:01:57,540 --> 00:02:02,960 I need to actually change these values to other values so I can't just take in for example Number two 31 00:02:02,960 --> 00:02:07,720 hundred for the power and number three hundred for the speed. 32 00:02:07,890 --> 00:02:11,820 And here as you can see I need to change these numbers. 33 00:02:11,820 --> 00:02:16,590 For example number 400 power and number 700 for this speed. 34 00:02:16,860 --> 00:02:20,100 And now if I hit on my project let's see what happens. 35 00:02:20,100 --> 00:02:26,640 So now as you can see our project actually our application is running on this emulator and here it says 36 00:02:26,750 --> 00:02:33,630 animal named Bear animal color black animal power 200 and animal speed is 300. 37 00:02:33,900 --> 00:02:42,030 And here it says animal named my lion animal color yellow animal power 400 animal species 700. 38 00:02:42,150 --> 00:02:48,680 And here it says can are lying and fight through the fighting power of our lion is one hundred and seventy. 39 00:02:48,720 --> 00:02:49,930 OK. 40 00:02:50,010 --> 00:02:52,020 So hopefully death makes sense. 41 00:02:52,020 --> 00:02:55,910 Let's actually use the power of putting morphism in Java. 42 00:02:56,020 --> 00:03:00,800 OK here let's actually create an animal object. 43 00:03:00,920 --> 00:03:02,020 Animal. 44 00:03:02,690 --> 00:03:03,220 OK. 45 00:03:03,540 --> 00:03:07,410 So I actually referred to the name of this Animal class. 46 00:03:07,410 --> 00:03:16,410 And here I want to actually give a name to this animal object my animal OK assignment operator and now 47 00:03:16,620 --> 00:03:19,830 I want to refer to the name of this lion object OK. 48 00:03:20,220 --> 00:03:20,690 Lion. 49 00:03:20,730 --> 00:03:27,810 So here as you can see I actually created an object from this animal class but here after the assignment 50 00:03:27,840 --> 00:03:30,450 operator it refers to the name of this object. 51 00:03:30,450 --> 00:03:31,560 OK. 52 00:03:31,560 --> 00:03:38,730 So because there is actually an ease our relationship between these lion class and this animal class 53 00:03:38,790 --> 00:03:44,510 because this lion class actually inherits all of the features and behaviors that is actually in say 54 00:03:44,520 --> 00:03:49,110 that this animal class there is an is a relationship between these two classes. 55 00:03:49,110 --> 00:03:49,690 OK. 56 00:03:49,920 --> 00:03:56,040 So here I could actually refer to the name of this object the name of this line object and then assign 57 00:03:56,050 --> 00:03:57,980 that object to this animal object. 58 00:03:58,020 --> 00:04:00,420 Here to this animal is valuable. 59 00:04:00,620 --> 00:04:01,290 OK. 60 00:04:01,530 --> 00:04:09,450 Because that is and actually is a relationship between this animal class and this lion class ok at compile 61 00:04:09,450 --> 00:04:09,780 time. 62 00:04:09,780 --> 00:04:10,510 It is OK. 63 00:04:10,530 --> 00:04:16,760 We can actually assign this value because that is an is a relationship between these two classes like 64 00:04:16,750 --> 00:04:23,190 in an animal and we could actually we can actually assign these lion objects to this animal. 65 00:04:23,390 --> 00:04:24,450 Valuable here. 66 00:04:24,540 --> 00:04:24,980 OK. 67 00:04:25,110 --> 00:04:28,100 Lion is actually an animal. 68 00:04:28,170 --> 00:04:28,860 OK. 69 00:04:29,220 --> 00:04:33,450 So I actually assigned this object to this animal variable. 70 00:04:33,780 --> 00:04:38,120 And now let's actually output this object to this. 71 00:04:38,160 --> 00:04:43,610 OK so here I can just take anti-X the polymorphism that said text. 72 00:04:43,620 --> 00:04:49,360 And now inside the practices I can just type in my animal that string. 73 00:04:49,710 --> 00:04:56,400 So because I actually fell to the name of this animal object here as you can see this animal ridable 74 00:04:56,700 --> 00:05:02,780 you may think that it's going to actually whistling method that is inside of this animal class. 75 00:05:02,780 --> 00:05:03,600 OK. 76 00:05:04,130 --> 00:05:09,860 But it's going to actually call the two thing Meffert that is inside of this lion class. 77 00:05:09,860 --> 00:05:10,120 OK. 78 00:05:10,130 --> 00:05:15,620 As you can see we have a history of it in say that we live in class because at runtime it's going to 79 00:05:15,620 --> 00:05:22,460 refer to this object located like an object that we actually assign to this animal and are variable 80 00:05:22,460 --> 00:05:22,880 here. 81 00:05:22,880 --> 00:05:23,380 OK. 82 00:05:23,540 --> 00:05:25,820 So let's start on our project and see what happens. 83 00:05:25,820 --> 00:05:32,450 So now as you can see our application is running on this emulator and here it says liar. 84 00:05:32,480 --> 00:05:41,120 Using polymorphism monkey animal name my lion animal color yellow animal power 400 animal speed 700. 85 00:05:41,290 --> 00:05:45,270 Can our lion fight through the fighting power over a lion. 86 00:05:45,320 --> 00:05:49,910 One hundred and seventy all though we actually created an object from the Animal class. 87 00:05:49,940 --> 00:05:56,960 OK here because we actually assign this like an object to this valuable at runtime it's going to actually 88 00:05:56,960 --> 00:06:00,900 call the twisting method that is related to this like an object. 89 00:06:00,890 --> 00:06:01,260 OK. 90 00:06:01,340 --> 00:06:04,150 Because it's going to actually feel like an object. 91 00:06:04,440 --> 00:06:04,770 OK. 92 00:06:04,790 --> 00:06:07,440 That's the power of polymorphism then in Java. 93 00:06:07,690 --> 00:06:09,420 And hopefully that makes sense. 94 00:06:09,530 --> 00:06:14,480 And if you have any questions please post the discussion of the course and if you do not understand 95 00:06:14,510 --> 00:06:20,360 the inheritance in Java Please watch their inheritance section of this course again. 96 00:06:20,360 --> 00:06:26,200 So now let's actually go back and say this content underline the example and then here I need to actually 97 00:06:26,200 --> 00:06:32,870 click on this clear cast here and now I need to actually drag a large takes you into this scroll you 98 00:06:32,870 --> 00:06:33,250 here. 99 00:06:33,260 --> 00:06:38,810 So here inside of this componentry section here inside this linearly sweaty call that's actually right 100 00:06:38,910 --> 00:06:44,540 a large takes you into this linearly aesthetical that is inside of this vertical scroll view here. 101 00:06:44,560 --> 00:06:51,700 OK and double click on it and delete the text of this text view and for the ID just type in here takes 102 00:06:51,800 --> 00:06:56,690 the chats OK and then press Enter key on your keyboard. 103 00:06:56,690 --> 00:07:02,150 So now let's actually go back and say this main activity the job right here and now let's actually create 104 00:07:02,240 --> 00:07:09,530 an object from the sticks class so takes you the chat's assignment operator. 105 00:07:09,710 --> 00:07:18,210 And then I need to test this object to a text view object find view by id r that Id dot TDX the checked 106 00:07:18,340 --> 00:07:22,310 OK and then I need to put in a semi-colon at the end of my statement here. 107 00:07:22,310 --> 00:07:26,760 OK so now let's actually create an object from this chat class. 108 00:07:26,780 --> 00:07:28,380 So I just need to type in here Chad. 109 00:07:28,550 --> 00:07:31,390 And the name of this object is my chats. 110 00:07:31,440 --> 00:07:40,040 OK assignments operator new chats and here I need to specify some arguments for the constructor of this 111 00:07:40,540 --> 00:07:41,400 chat class here. 112 00:07:41,420 --> 00:07:43,070 As you can see chat object. 113 00:07:43,400 --> 00:07:47,350 So for the name of this cat just type in here my chat. 114 00:07:47,460 --> 00:07:54,030 OK comma the color of my child is for example black or white. 115 00:07:54,490 --> 00:08:03,170 Ok come up and the power of my child is for example 400 comma and the speed of my cat is for example 116 00:08:03,310 --> 00:08:04,150 seven hundred. 117 00:08:04,160 --> 00:08:04,660 OK. 118 00:08:04,850 --> 00:08:08,430 And then I need to put in a semicolon at the end of my statement here. 119 00:08:08,810 --> 00:08:10,160 So now it's actually Outsports. 120 00:08:10,160 --> 00:08:11,650 This cat is my cat. 121 00:08:11,660 --> 00:08:15,880 Object to the screen so I just need to take it here to the chat. 122 00:08:16,010 --> 00:08:20,150 That said text my child's dot two is three. 123 00:08:20,430 --> 00:08:24,190 OK so now let's execute on our project and see what happens. 124 00:08:24,260 --> 00:08:30,830 So now as you can see our application is running on DS emulator and if you scroll down here you can 125 00:08:30,830 --> 00:08:32,270 see it says cats. 126 00:08:32,630 --> 00:08:34,130 Animal named my chats. 127 00:08:34,310 --> 00:08:35,120 OK. 128 00:08:35,120 --> 00:08:40,390 So it is actually calling the 2st Meffert that is inside of this cat class yellow cake Chatz animal 129 00:08:40,400 --> 00:08:46,410 name my cat animal color of white animal power 400 an animal speed seven hundred. 130 00:08:46,430 --> 00:08:51,670 OK so now let's actually delete this line of code here first. 131 00:08:51,760 --> 00:08:52,280 OK. 132 00:08:52,610 --> 00:08:56,040 And then this actually creates an object from the Animal class. 133 00:08:56,060 --> 00:08:57,050 OK. 134 00:08:57,770 --> 00:09:02,730 And the name of my animal is for example my animal too. 135 00:09:02,940 --> 00:09:03,610 OK. 136 00:09:03,990 --> 00:09:11,260 Assignment operator my chats my chats and put a semi-colon at the end of your statement here. 137 00:09:11,510 --> 00:09:16,460 OK so now listen to that Outsports this my animal to this clean. 138 00:09:16,460 --> 00:09:16,820 OK. 139 00:09:16,850 --> 00:09:20,310 So just they can hear the cat that said Tick's. 140 00:09:20,330 --> 00:09:26,690 So say that the Prentice's of this set takes Smurfette just referred to the name of this animal to object 141 00:09:27,080 --> 00:09:28,900 dot to a string. 142 00:09:29,420 --> 00:09:33,890 So now let's actually again run our project and see what happens. 143 00:09:33,890 --> 00:09:34,350 OK. 144 00:09:34,430 --> 00:09:38,410 Now as you can see our application is running on this emulator here. 145 00:09:38,630 --> 00:09:42,480 And here you can see again the string Meffert that is inside of this. 146 00:09:42,500 --> 00:09:48,740 Inside this cat class is being called the cat's animal name my cats animal color white animal power 147 00:09:48,750 --> 00:09:51,890 400 and animal speed is 700. 148 00:09:51,890 --> 00:09:57,490 So as you can see here first of all they created an object from this cat's class called my Chatz. 149 00:09:57,610 --> 00:10:03,950 OK in inline first T6 I actually created another object from this animal class and the name of this 150 00:10:03,950 --> 00:10:05,760 object is my animal too. 151 00:10:06,050 --> 00:10:06,580 OK. 152 00:10:06,770 --> 00:10:12,580 And here I put an assignment operator and then I referred to the name of this my chat's object. 153 00:10:12,860 --> 00:10:17,410 And I assigned this object to this value to this animal valuable here my animal too. 154 00:10:17,540 --> 00:10:18,230 OK. 155 00:10:18,320 --> 00:10:25,220 And 11:57 I actually called these two string Mefford on this my animal to object as you can see but 156 00:10:25,250 --> 00:10:27,720 at runtime as you can see here. 157 00:10:27,920 --> 00:10:33,680 It actually called this 2st Merfeld that is actually inside of these chats class. 158 00:10:34,000 --> 00:10:34,600 OK. 159 00:10:34,700 --> 00:10:39,610 Because that's right because at runtime it's going to actually refer to this object. 160 00:10:39,640 --> 00:10:40,550 Keep my Chatz. 161 00:10:40,690 --> 00:10:41,000 OK. 162 00:10:41,000 --> 00:10:47,460 And then it's going to call this the string Meffert that is inside of these chats class. 163 00:10:47,500 --> 00:10:52,810 It's actually called the twisting method that is actually related to this object. 164 00:10:52,970 --> 00:10:54,890 And then we can see these values here. 165 00:10:55,000 --> 00:10:55,460 OK. 166 00:10:55,520 --> 00:11:00,440 So again that's the power of polymorphism and I hopefully that makes sense. 167 00:11:00,440 --> 00:11:05,750 And if you have any questions about polymorphism then please post the discussion in the course and then 168 00:11:05,810 --> 00:11:08,420 I'll do my best to answer all of your questions. 169 00:11:08,790 --> 00:11:13,370 And thank you very much for watching and I'll see you in the next tutorial.