1 00:00:01,020 --> 00:00:03,720 So analysis actually put in some more lines of code here. 2 00:00:03,810 --> 00:00:11,370 So now want to actually implement the evaluates performance method that we actually inherit from this 3 00:00:11,400 --> 00:00:12,610 computer class here. 4 00:00:12,620 --> 00:00:13,350 As you can see. 5 00:00:13,470 --> 00:00:13,940 OK. 6 00:00:14,190 --> 00:00:21,400 So here I just need to type in evaluate performance and now as you can see we are writing dismay for 7 00:00:21,430 --> 00:00:24,930 the public double evaluate performance. 8 00:00:24,930 --> 00:00:26,770 And now as you can see the edit is gone. 9 00:00:26,820 --> 00:00:27,420 OK. 10 00:00:27,840 --> 00:00:31,690 So now inside of this Meffert as you can see it says returns 0. 11 00:00:31,770 --> 00:00:33,890 So just delete this line of code here. 12 00:00:34,410 --> 00:00:37,770 And now if want to actually put in our own implementations. 13 00:00:37,920 --> 00:00:40,130 That is actually specific only to this. 14 00:00:40,220 --> 00:00:41,700 There's a computer class. 15 00:00:41,730 --> 00:00:42,280 OK. 16 00:00:42,510 --> 00:00:47,400 So just so inside of this method here I can just type in return. 17 00:00:47,800 --> 00:00:50,370 You power multiplied by them. 18 00:00:50,630 --> 00:00:51,170 OK. 19 00:00:51,420 --> 00:00:52,480 And semicolon. 20 00:00:52,740 --> 00:00:57,880 So here I am actually returning the result of this multiplication to the color of the Smurfette. 21 00:00:57,900 --> 00:00:58,470 OK. 22 00:00:58,740 --> 00:01:02,850 So because this mirror actually needs to return a value of type double. 23 00:01:02,880 --> 00:01:08,090 Here I am actually returning the multiplication the result of multiplication of these two values. 24 00:01:08,090 --> 00:01:08,480 OK. 25 00:01:08,610 --> 00:01:13,780 So remember that we declared these two instance variables as you can see double. 26 00:01:13,900 --> 00:01:14,170 OK. 27 00:01:14,190 --> 00:01:19,210 That type of this instance variables are double is double OK. 28 00:01:19,470 --> 00:01:24,440 And here we are actually turning up the result of multiplication of these two values. 29 00:01:24,460 --> 00:01:30,860 OK let's actually overwrite the two string method that we actually inherit from this computer class. 30 00:01:30,870 --> 00:01:35,370 So as you can see here inside this computer class if you have these are two string method. 31 00:01:35,460 --> 00:01:36,000 OK. 32 00:01:36,150 --> 00:01:40,980 Now I want to actually overwrite this method inside of this this computer class. 33 00:01:41,160 --> 00:01:44,710 So as you can see here this is our two string Meffert. 34 00:01:45,030 --> 00:01:51,920 And here inside this MFA as you can see I am saying that return string data format and inside of these 35 00:01:52,150 --> 00:01:55,740 codes I am specifying the format of my string value. 36 00:01:55,890 --> 00:02:00,380 So this person is actually for this Super two string here. 37 00:02:00,540 --> 00:02:05,120 So this Super 8 actually refers to the name of this superclass computer. 38 00:02:05,430 --> 00:02:06,010 OK. 39 00:02:06,180 --> 00:02:10,550 And Dot 2st and here I am calling this Smurfette restraint on the super. 40 00:02:10,560 --> 00:02:15,660 So it's going to go inside of the superclass and then it's going actually execute this line of code 41 00:02:15,660 --> 00:02:17,980 that is inside of these two string Meffert. 42 00:02:18,030 --> 00:02:20,270 So it's going to return a string. 43 00:02:20,270 --> 00:02:20,690 Right. 44 00:02:20,730 --> 00:02:21,710 OK names. 45 00:02:21,860 --> 00:02:24,190 Get screen and keyboard. 46 00:02:24,240 --> 00:02:24,920 OK. 47 00:02:25,290 --> 00:02:28,610 So here is this person this is for this value super. 48 00:02:28,620 --> 00:02:29,430 That was three. 49 00:02:29,520 --> 00:02:29,980 OK. 50 00:02:30,130 --> 00:02:31,970 Percent and a your lead character. 51 00:02:32,130 --> 00:02:34,380 And we have another person here. 52 00:02:34,470 --> 00:02:38,970 This is for people power here as you can see in space. 53 00:02:38,970 --> 00:02:41,040 And we have a percent here. 54 00:02:41,070 --> 00:02:41,550 OK. 55 00:02:41,610 --> 00:02:44,950 So person F is for actually small values. 56 00:02:45,000 --> 00:02:45,530 OK. 57 00:02:45,720 --> 00:02:52,670 So Seip get CPR power as you can see a super power instance valuable is actually of type double 71st 58 00:02:52,710 --> 00:02:54,150 Taipan percent. 59 00:02:54,390 --> 00:02:59,240 And we have a new line character and we have our person is here again. 60 00:02:59,250 --> 00:03:02,320 So this is for RAM Colan space precent. 61 00:03:02,330 --> 00:03:06,160 If so this person is for this get RAM here OK. 62 00:03:06,570 --> 00:03:08,440 So hopefully that makes sense. 63 00:03:08,470 --> 00:03:11,850 And now let's take you to go inside this laptop computer. 64 00:03:12,090 --> 00:03:12,780 OK. 65 00:03:13,110 --> 00:03:18,460 And here after the class name here just typing that extends computer. 66 00:03:18,600 --> 00:03:23,760 So here you are actually inheriting all of the features and behaviors that are actually inside of this 67 00:03:23,760 --> 00:03:24,740 computer class. 68 00:03:24,750 --> 00:03:25,160 OK. 69 00:03:25,260 --> 00:03:27,890 So here again it says class. 70 00:03:27,900 --> 00:03:35,620 Laptop computer must either be declared abstract or implement abstract Meffert evaluates performance 71 00:03:35,640 --> 00:03:36,330 in computer. 72 00:03:36,350 --> 00:03:42,600 OK so now let's actually create some instance variables inside of this laptop computer. 73 00:03:42,600 --> 00:03:46,150 So as you can see here I declare these instance variables here. 74 00:03:46,260 --> 00:03:46,750 OK. 75 00:03:46,930 --> 00:03:48,520 Private stream touchpad. 76 00:03:48,600 --> 00:03:55,830 So every laptop actually has a touchpad private double super power and Praimnath double RAM. 77 00:03:56,050 --> 00:04:02,280 OK so now it's actually create a constructor inside of this laptop computer class. 78 00:04:02,280 --> 00:04:07,170 So as you can see here this is my constructor for this laptop computer class. 79 00:04:07,200 --> 00:04:10,360 So the access modifier of my constructor is public. 80 00:04:10,650 --> 00:04:16,650 The name of this constructed is a laptop computer so remember that the name of your constructor must 81 00:04:16,650 --> 00:04:18,860 be the same as the name of your class. 82 00:04:18,870 --> 00:04:23,750 Ok laptop computer and this construct invites you to accepts some arguments. 83 00:04:23,760 --> 00:04:24,300 OK. 84 00:04:24,300 --> 00:04:27,840 String name string screen and string keyboard. 85 00:04:27,960 --> 00:04:34,750 OK string and mouse double C.P.R. power double RAM and strange touchback. 86 00:04:34,770 --> 00:04:35,280 OK. 87 00:04:35,400 --> 00:04:41,090 So because we are inheriting all of the features and behaviors that are inside of this computer class. 88 00:04:41,090 --> 00:04:41,580 OK. 89 00:04:41,850 --> 00:04:45,900 We need to actually initialize the constructor of the superclass. 90 00:04:45,900 --> 00:04:50,160 So that's why we actually typed here super. 91 00:04:50,340 --> 00:04:56,370 And inside of the parenthesis of the super I just initialized the constructor of this of the superclass 92 00:04:56,460 --> 00:04:58,290 name screen keyboard. 93 00:04:58,650 --> 00:05:07,150 And here I am a the instantiating my instance variables as you can see here they start CPR power assignment 94 00:05:07,180 --> 00:05:09,080 operator Sibiu power. 95 00:05:09,100 --> 00:05:09,680 OK. 96 00:05:09,910 --> 00:05:13,610 Does that RAM assignment operator RAM. 97 00:05:13,630 --> 00:05:16,490 Does the touchpad assignment operator touchpad. 98 00:05:16,530 --> 00:05:24,730 OK so now let's actually create some getters and Jet and actually our setters for this instance variables. 99 00:05:24,730 --> 00:05:31,490 So here inside of this class just right click here and then click and generate and then get her and 100 00:05:31,550 --> 00:05:37,360 setter and then select all of these instance variables here and then click on OK. 101 00:05:37,510 --> 00:05:42,670 So as you can see here now these are setters and getters that are actually generated automatically by 102 00:05:42,670 --> 00:05:44,350 the android did you eat. 103 00:05:44,590 --> 00:05:51,230 OK so now let's actually implement the evaluates performance Smurfit that we actually inherit from the 104 00:05:51,280 --> 00:05:52,230 computer class. 105 00:05:52,240 --> 00:05:52,830 OK. 106 00:05:53,110 --> 00:05:58,280 So here in this class I can just putting this effort here. 107 00:05:58,390 --> 00:06:05,050 So at sign over right public double evaluates performance and inside of this Meffert I am just saying 108 00:06:05,080 --> 00:06:11,100 that return the result of multiplication of this superpower and this slam. 109 00:06:11,220 --> 00:06:14,900 OK and now let's actually overwrite the two string method. 110 00:06:14,980 --> 00:06:21,410 And now let's actually delete this line of code that is inside of these two string Muffet here. 111 00:06:22,000 --> 00:06:26,440 And now we can actually put in our own implementations inside of this method. 112 00:06:26,440 --> 00:06:26,730 OK. 113 00:06:26,740 --> 00:06:33,080 So inside of these two string Meffert actually putting on when pasting a line of code here. 114 00:06:33,280 --> 00:06:33,660 OK. 115 00:06:33,670 --> 00:06:40,180 So as you can see here it says Return string data formats and in say that the double quotes I am specifying 116 00:06:40,180 --> 00:06:42,560 the format of my string value. 117 00:06:42,670 --> 00:06:48,220 So this percent is here as actually is for this supertax is to string here. 118 00:06:48,220 --> 00:06:51,280 So super refers to the name of the superclass. 119 00:06:51,300 --> 00:06:57,320 So this superclass is computer and this 2st is actually this is with string method here. 120 00:06:57,350 --> 00:06:57,540 OK. 121 00:06:57,550 --> 00:07:02,620 So it's going to actually execute this line of code and it's going to return the string value here. 122 00:07:02,630 --> 00:07:05,720 OK gets named its screen and get keyboard. 123 00:07:05,740 --> 00:07:11,860 So inside of this laptop computer as you can see this person is for this super that in here. 124 00:07:12,180 --> 00:07:17,210 If you have a newline character a person and space person is again here. 125 00:07:17,220 --> 00:07:24,390 So this person is for this touchpad and we have another person here and this person is for this method. 126 00:07:24,400 --> 00:07:25,190 Get touchpads. 127 00:07:25,240 --> 00:07:25,940 OK. 128 00:07:26,500 --> 00:07:28,980 So hopefully that makes sense. 129 00:07:29,330 --> 00:07:34,630 And now it's actually go inside these smart phone computer that job file here. 130 00:07:34,810 --> 00:07:41,910 And now after the class think smartphone computer just typing here extends computer OK. 131 00:07:42,250 --> 00:07:47,310 And here inside of this class let's actually declared some instance variables. 132 00:07:47,560 --> 00:07:54,390 So as you can see here the first instance variable is actually private stream operating system. 133 00:07:54,430 --> 00:07:59,140 The second instance variable is private double Sibiu power. 134 00:07:59,140 --> 00:08:01,500 And the first instance where the event is private. 135 00:08:01,660 --> 00:08:03,330 Double ram OK. 136 00:08:03,700 --> 00:08:10,000 So now let's actually create a constructor for this smart phone computer class here. 137 00:08:10,090 --> 00:08:13,610 So as you can see here this is my constructor for this class. 138 00:08:13,660 --> 00:08:14,160 OK. 139 00:08:14,410 --> 00:08:17,750 And the access modifier of this class is public. 140 00:08:17,890 --> 00:08:24,130 The name of this constructor is smart one computer and this constructor actually accepts some arguments. 141 00:08:24,150 --> 00:08:28,540 OK so the first argument as against the name of type strength. 142 00:08:28,660 --> 00:08:32,320 The second argument is screen of type string again. 143 00:08:32,530 --> 00:08:36,520 And the first argument is actually again a keyboard of types three in. 144 00:08:36,550 --> 00:08:37,050 OK. 145 00:08:37,330 --> 00:08:41,840 So as you can see the fourth argument is operating system strange. 146 00:08:42,100 --> 00:08:47,010 And here the argument is C.P.R. power is actually of type double. 147 00:08:47,080 --> 00:08:51,120 And this argument as you can see RAM is actually of type double here. 148 00:08:51,190 --> 00:08:51,800 OK. 149 00:08:52,150 --> 00:08:57,670 And now because we are actually inheriting all of the features and behaviors that are inside of this 150 00:08:57,670 --> 00:09:04,670 computer class we need to initialize the constructor of the superclass so super name ok. 151 00:09:04,780 --> 00:09:06,090 Screen keyboard. 152 00:09:06,250 --> 00:09:06,520 OK. 153 00:09:06,550 --> 00:09:11,080 And here as you can see I created two if statements here. 154 00:09:11,170 --> 00:09:17,410 So if the value of these Sibiu power argument as you can see here is less than or equal to number 0 155 00:09:17,710 --> 00:09:20,830 then float new illegal are the argument exception. 156 00:09:20,830 --> 00:09:23,760 The value of the CPO power must be greater than zero. 157 00:09:23,770 --> 00:09:24,250 OK. 158 00:09:24,400 --> 00:09:31,560 So if the user of this class mistakenly assign a value that is equal to number 0 or less and the number 159 00:09:31,580 --> 00:09:34,890 0 or replicate their application is going to actually crash. 160 00:09:35,050 --> 00:09:35,780 Crash. 161 00:09:35,950 --> 00:09:36,570 OK. 162 00:09:36,760 --> 00:09:39,490 And here I actually created another if statement. 163 00:09:39,610 --> 00:09:47,840 If the value of this actually Lamhe valuable as you can see here is less than or equal to number 0. 164 00:09:47,890 --> 00:09:48,360 OK. 165 00:09:48,490 --> 00:09:54,690 If the value of this argument is less than or equal to number 0 for you illiquid argument exception 166 00:09:54,970 --> 00:09:58,010 the value of the RAM must be greater than number 0. 167 00:09:58,030 --> 00:09:58,520 OK. 168 00:09:58,750 --> 00:10:02,220 And here I am actually then shading my instance variables.