1 00:00:00,420 --> 00:00:07,350 So now if I actually want to output the value of this instance variable to the console Let's see what 2 00:00:07,350 --> 00:00:11,510 happens system that out that princeling. 3 00:00:12,660 --> 00:00:18,780 And then inside the prentices I defended the name of my object that speaks OK and then I put a semicolon 4 00:00:18,840 --> 00:00:20,680 at the end of my statement. 5 00:00:20,700 --> 00:00:27,390 So now if I run on my project as you can see this is the value of this instance variables of this might 6 00:00:27,600 --> 00:00:28,050 object. 7 00:00:28,050 --> 00:00:30,480 OK first the value was 70. 8 00:00:30,660 --> 00:00:35,540 And then in line 11 we decided to change that value to number 25. 9 00:00:35,670 --> 00:00:40,440 And then in line 12 we decided to out food that's value to the consumer. 10 00:00:40,440 --> 00:00:41,730 So this is our value. 11 00:00:41,790 --> 00:00:42,340 OK. 12 00:00:42,570 --> 00:00:48,500 But this is not the proper way in order to assign a value to our instance variables. 13 00:00:48,540 --> 00:00:50,020 And this is not good. 14 00:00:50,120 --> 00:00:50,630 OK. 15 00:00:50,700 --> 00:00:57,970 We should actually use a method called setter in order to actually assign values to our instance variables. 16 00:00:58,170 --> 00:01:01,160 OK in that way our codes are more secure. 17 00:01:01,340 --> 00:01:04,650 OK so now let me show you how you can do that. 18 00:01:04,650 --> 00:01:08,870 So inside that class we need to create some if it's OK. 19 00:01:08,880 --> 00:01:15,900 So first of all I want to create a get out of my fit and a set in my head for my speed instance variable. 20 00:01:15,920 --> 00:01:16,370 OK. 21 00:01:16,470 --> 00:01:24,090 After creating our spit instance variable i just need to type pain into the return type of My method 22 00:01:24,120 --> 00:01:29,410 is it and the name of my method is get speed. 23 00:01:29,720 --> 00:01:30,370 OK. 24 00:01:30,600 --> 00:01:34,100 And then I put a pair of round brackets after my Meffert name. 25 00:01:34,350 --> 00:01:38,700 And then I open and close my method by using these curly braces. 26 00:01:38,700 --> 00:01:39,380 OK. 27 00:01:39,720 --> 00:01:46,470 So inside this method I can actually return the value of this speed instance variable. 28 00:01:46,470 --> 00:01:46,980 OK. 29 00:01:47,070 --> 00:01:50,860 So I just need to type in here return speed. 30 00:01:51,230 --> 00:01:52,030 OK. 31 00:01:52,140 --> 00:01:56,770 So as you can see here this is our getter method for this instance variable. 32 00:01:57,120 --> 00:01:59,810 The return type of this method is it. 33 00:01:59,850 --> 00:02:01,040 OK. 34 00:02:01,380 --> 00:02:04,910 And the name of this method is get speed. 35 00:02:05,170 --> 00:02:06,170 OK. 36 00:02:06,330 --> 00:02:08,670 And this left has no arguments. 37 00:02:08,880 --> 00:02:09,640 OK. 38 00:02:10,020 --> 00:02:19,060 And inside the Smurfette I am actually returning the value of this speed instance variable return speed. 39 00:02:19,420 --> 00:02:19,930 OK. 40 00:02:19,950 --> 00:02:23,660 And then I can actually create another Meffert which is the setter. 41 00:02:23,730 --> 00:02:24,320 OK. 42 00:02:24,450 --> 00:02:29,940 So here I can just type in void the return type of my Mefford is void. 43 00:02:29,970 --> 00:02:31,880 This never is going to return nothing. 44 00:02:32,040 --> 00:02:32,700 OK. 45 00:02:32,970 --> 00:02:38,080 And the name of this method is set speed. 46 00:02:38,660 --> 00:02:39,480 OK. 47 00:02:39,920 --> 00:02:45,650 And then inside Apprentice's all you want to specify that this method is going to actually accept an 48 00:02:45,710 --> 00:02:46,490 argument. 49 00:02:46,520 --> 00:02:55,340 OK so the data type of my argument is int OK and the name of my argument is for example value and then 50 00:02:55,380 --> 00:03:03,360 I open and close my Meffert by using these curly braces and inside the Smurfette I can actually refer 51 00:03:03,360 --> 00:03:06,600 to the name of my speed instance variable. 52 00:03:07,240 --> 00:03:08,010 OK. 53 00:03:08,330 --> 00:03:11,680 And then I put an assignment operator here. 54 00:03:12,020 --> 00:03:16,300 And then I refer to the value variable here. 55 00:03:16,340 --> 00:03:16,970 OK. 56 00:03:17,210 --> 00:03:21,440 So as you can see here I created or get hurt my fat. 57 00:03:21,830 --> 00:03:23,140 OK this is our Gitomer for. 58 00:03:23,150 --> 00:03:23,850 OK. 59 00:03:24,050 --> 00:03:30,050 I created a get her my friend and set her Mefford for our speed instance variable. 60 00:03:30,050 --> 00:03:30,860 OK. 61 00:03:31,370 --> 00:03:36,490 So these two methods are get here and so term effects of our speed instance variable. 62 00:03:36,500 --> 00:03:36,970 OK. 63 00:03:37,070 --> 00:03:42,800 So this get home if it is going to have a return value of type it. 64 00:03:42,950 --> 00:03:43,400 OK. 65 00:03:43,400 --> 00:03:48,500 And as you can see here I specified that the return type of this get and if it is it. 66 00:03:48,560 --> 00:03:54,250 And inside the Smurfette I returned the value of this instance variable. 67 00:03:54,350 --> 00:03:59,780 I actually created this variable and this variable inside the class. 68 00:03:59,780 --> 00:04:00,250 OK. 69 00:04:00,380 --> 00:04:09,840 So because I actually created these variables inside this class and not inside any of these methods. 70 00:04:10,160 --> 00:04:14,250 OK I can access these variables from any place in my class. 71 00:04:14,280 --> 00:04:21,890 OK but if I for example create a variable inside these settlements for example I can actually create 72 00:04:21,890 --> 00:04:28,900 a variable in a custom variable for example. 73 00:04:28,970 --> 00:04:34,760 This is of value but I cannot access this variable from this method. 74 00:04:34,790 --> 00:04:38,060 OK custom variable. 75 00:04:38,300 --> 00:04:43,390 And if I for example want to assign another value to this variable I cannot do that. 76 00:04:43,400 --> 00:04:44,000 Why. 77 00:04:44,060 --> 00:04:47,530 Because this variable is created inside the Smurfette. 78 00:04:47,540 --> 00:04:48,050 OK. 79 00:04:48,200 --> 00:04:52,330 And we cannot actually refer to this valuable insight. 80 00:04:52,340 --> 00:04:56,410 This run of it these kinds of variables are local variables. 81 00:04:56,450 --> 00:05:02,010 OK this argument here is also of local variable. 82 00:05:02,110 --> 00:05:02,520 OK. 83 00:05:02,540 --> 00:05:07,060 Because we can only refer to these variables inside this method. 84 00:05:07,130 --> 00:05:07,720 OK. 85 00:05:07,880 --> 00:05:11,220 We cannot actually refer to these variables inside a.m.-I. 86 00:05:11,260 --> 00:05:13,300 Ok for example this run method. 87 00:05:13,600 --> 00:05:14,090 OK. 88 00:05:14,180 --> 00:05:21,470 But we can actually access this split instance variable and and this power instance variable from any 89 00:05:21,480 --> 00:05:23,280 places inside our class. 90 00:05:23,360 --> 00:05:24,150 OK. 91 00:05:24,590 --> 00:05:30,710 So as you can see here I can actually access the value of the power instance variable inside the sleep 92 00:05:30,860 --> 00:05:31,340 method. 93 00:05:31,430 --> 00:05:37,670 Ok so I can just refer to the name of my power instance variable and then I can assign another value 94 00:05:37,670 --> 00:05:39,160 to this variable. 95 00:05:39,440 --> 00:05:41,920 So as you can see here we are allowed to do that. 96 00:05:41,930 --> 00:05:42,460 OK. 97 00:05:42,620 --> 00:05:49,130 But here we cannot access this variable that is created inside this set speed method. 98 00:05:49,130 --> 00:05:49,790 OK. 99 00:05:50,030 --> 00:05:54,690 So these kinds of variables are local variables because they are local. 100 00:05:54,740 --> 00:05:55,470 OK. 101 00:05:55,730 --> 00:05:58,490 So hopefully that makes sense. 102 00:05:58,490 --> 00:06:05,090 So now let me actually delete these lines of code here because I want to actually explain the concept 103 00:06:05,090 --> 00:06:06,340 of local variables. 104 00:06:06,380 --> 00:06:06,800 OK. 105 00:06:06,800 --> 00:06:09,540 And as you can see here this is our set friend. 106 00:06:09,550 --> 00:06:09,900 OK. 107 00:06:09,920 --> 00:06:16,100 The return type of this method is void and the name of this method is set speed and this Clifford accepts 108 00:06:16,190 --> 00:06:16,960 an argument. 109 00:06:16,970 --> 00:06:17,620 OK. 110 00:06:17,750 --> 00:06:23,180 And then inside this method we are actually assigning this argument to our sweet instance variable. 111 00:06:23,210 --> 00:06:23,710 OK. 112 00:06:23,840 --> 00:06:31,400 So whenever that we actually call this term effect in our code we need to actually pass our value to 113 00:06:31,400 --> 00:06:31,890 the Smurfette. 114 00:06:31,910 --> 00:06:32,570 OK. 115 00:06:32,870 --> 00:06:40,160 And that insight is nymphet we are actually assigning the past value to our speed instance variable. 116 00:06:40,160 --> 00:06:47,200 Ok so now I want to actually create a set here and I get home I friend for our power instance variable. 117 00:06:47,280 --> 00:06:51,280 So first I'm going to actually create or get hurt my friend. 118 00:06:51,290 --> 00:07:00,530 So the return type of My method is in the name of my method is get power ok and I put a pair of round 119 00:07:00,530 --> 00:07:08,720 brackets after my Meffert name and then I open and close my head by using an opening curly brace followed 120 00:07:08,720 --> 00:07:10,250 by our closing curly brace. 121 00:07:11,070 --> 00:07:11,920 OK. 122 00:07:12,330 --> 00:07:17,830 And then inside this my faith I need to return the value of the power instance variable. 123 00:07:18,000 --> 00:07:21,840 So I just need to type in return power. 124 00:07:22,290 --> 00:07:22,860 OK. 125 00:07:22,860 --> 00:07:27,830 And then let me actually create a set for my faith for our power instance variable. 126 00:07:27,840 --> 00:07:36,180 So the return type of Our method is Voyt and the name of our Meffert is set power. 127 00:07:36,790 --> 00:07:37,490 OK. 128 00:07:37,530 --> 00:07:42,920 And then I put in a pair of round brackets here after my name. 129 00:07:43,110 --> 00:07:48,210 And then I want to specify that this method is going to actually accept arguments. 130 00:07:48,240 --> 00:07:54,890 OK so the data type of my argument is int and the name of my argument is value. 131 00:07:55,220 --> 00:07:55,950 OK. 132 00:07:56,280 --> 00:08:02,070 And then I need to open and close my method by using an opening curly brace followed by our closing 133 00:08:02,080 --> 00:08:02,550 Colibri. 134 00:08:02,590 --> 00:08:03,390 OK. 135 00:08:03,780 --> 00:08:10,610 So inside this method first I need to look first to the name of my power variable power. 136 00:08:10,970 --> 00:08:11,840 OK. 137 00:08:12,210 --> 00:08:19,600 And then I put in an assignment operator here and then I referred to the name of my argument value. 138 00:08:19,730 --> 00:08:20,310 OK. 139 00:08:20,430 --> 00:08:27,150 So whenever that we actually call this Smurfette we need to actually pass our value to the Smurfette 140 00:08:27,480 --> 00:08:31,700 and then that value is going to be assigned to this power instance variable. 141 00:08:31,920 --> 00:08:39,360 Ok so in this way we can actually set values to our power instance variable. 142 00:08:39,480 --> 00:08:45,120 So you may wonder is that how we can actually use these setters and getters methods. 143 00:08:45,180 --> 00:08:48,180 So inside the main class as you can see here. 144 00:08:48,180 --> 00:08:53,730 First let me actually comment out these lines of code here and then we going to create another object 145 00:08:54,030 --> 00:08:55,130 from the start class. 146 00:08:55,140 --> 00:08:56,250 OK. 147 00:08:56,340 --> 00:09:04,250 So first I need to refer to the name of my class stock and then I need to give my object a name. 148 00:09:04,260 --> 00:09:07,720 My second dog. 149 00:09:08,440 --> 00:09:09,290 OK. 150 00:09:09,750 --> 00:09:15,580 And then I put in an assignment operator here and then I use this keyboard here knew. 151 00:09:15,960 --> 00:09:19,720 And then again I referred to the name of the class dog. 152 00:09:20,880 --> 00:09:24,490 And then I put in our programs brackets after my class name. 153 00:09:24,490 --> 00:09:25,050 OK. 154 00:09:25,260 --> 00:09:29,770 So I need to put in a semicolon at the end of my statement. 155 00:09:29,850 --> 00:09:35,230 So as you can see here we created another object from this class. 156 00:09:35,250 --> 00:09:35,650 OK. 157 00:09:35,670 --> 00:09:41,530 So here I want to actually access the value of the instance variables of my second dog object. 158 00:09:41,550 --> 00:09:42,100 OK. 159 00:09:42,270 --> 00:09:46,830 So in the past we actually accessed those instance variables directly. 160 00:09:46,830 --> 00:09:47,060 OK. 161 00:09:47,070 --> 00:09:53,550 As you can see here but here are you want to actually access the value of these instance variables by 162 00:09:53,550 --> 00:09:56,710 using these getters and setters methods. 163 00:09:56,730 --> 00:09:57,120 OK.