1 00:00:00,180 --> 00:00:05,230 So first of all let me comment with this line of code here because I don't want to execute it. 2 00:00:05,340 --> 00:00:13,280 So I want to actually access the value of this valuable that I created in this law and class. 3 00:00:13,290 --> 00:00:13,880 OK. 4 00:00:13,920 --> 00:00:20,640 So inside the main class you want to actually output the value of the speech value that I created inside 5 00:00:20,640 --> 00:00:23,480 the lion class onto the console. 6 00:00:23,610 --> 00:00:24,950 So how can I do that. 7 00:00:24,990 --> 00:00:26,010 So how can I do that. 8 00:00:26,010 --> 00:00:32,400 First of all I just need to take Here system that's out print to learn and then inside the apprentice's 9 00:00:32,850 --> 00:00:35,850 I just need to refer to the name of my object. 10 00:00:35,850 --> 00:00:40,980 First of all OK and then I use the dot notation here. 11 00:00:41,430 --> 00:00:47,730 And as you can see it's going to actually show us the speed valuable that I created inside the lion 12 00:00:47,730 --> 00:00:48,070 class. 13 00:00:48,090 --> 00:00:48,780 OK. 14 00:00:49,110 --> 00:00:52,120 It is now recommending us to choose this option. 15 00:00:52,230 --> 00:00:57,760 So the name of our barrier is speed that data type are valuable is it. 16 00:00:57,870 --> 00:01:00,810 And this variable is inside the client class. 17 00:01:01,000 --> 00:01:07,170 OK so if I use speed and then at the end of my statement I put a semicolon. 18 00:01:07,500 --> 00:01:12,210 So now if I get on my project as you can see it's going out with this value to the console. 19 00:01:12,210 --> 00:01:12,950 OK. 20 00:01:13,230 --> 00:01:19,970 So this value is the value of this valuable that I created inside the client class. 21 00:01:20,040 --> 00:01:27,100 Ok this variable is dedicated for the instances that we create from this law class. 22 00:01:27,120 --> 00:01:27,800 OK. 23 00:01:28,170 --> 00:01:37,160 Here we are actually creating an instance from this client class and in line 14 we are actually outputting 24 00:01:37,470 --> 00:01:43,290 the value of this value in the value of this variable that we created inside the lion class. 25 00:01:43,290 --> 00:01:48,760 So now let me show you that you can actually change the value of that speed variable. 26 00:01:48,960 --> 00:01:56,130 So first of all I need to refer to the name of my object my line and then dot and then I choose this 27 00:01:56,320 --> 00:01:57,380 variable. 28 00:01:57,870 --> 00:02:02,180 And then I can assign another value to my valuable for example number 80. 29 00:02:02,280 --> 00:02:06,130 And then at the end of my statement I need to put in a semi-colon. 30 00:02:06,150 --> 00:02:12,930 So now if I want to output the value of my Spizz valuable to the console I just need to type in her 31 00:02:12,930 --> 00:02:22,060 system that out that print land and then inside the prentices I can my life in that speech. 32 00:02:22,290 --> 00:02:23,010 OK. 33 00:02:23,010 --> 00:02:25,860 And then at the end of my statement I need to put in a semicolon. 34 00:02:25,890 --> 00:02:31,770 So first of all let me actually put a text here or there to specify that the value of my line object 35 00:02:31,830 --> 00:02:33,210 is actually changed. 36 00:02:33,210 --> 00:02:39,870 So I just need to put into double quotes here and then I use the plus operator here in order to actually 37 00:02:39,870 --> 00:02:42,340 concatenate this object to my text. 38 00:02:42,360 --> 00:02:42,960 OK. 39 00:02:43,110 --> 00:02:55,810 So inside the double quotes just type in here this is the value of the speed variable of my line object. 40 00:02:56,430 --> 00:02:57,210 OK. 41 00:02:57,480 --> 00:03:02,460 And if I run my project as you can see it's going to output this value to the counselor OK. 42 00:03:02,640 --> 00:03:06,640 This is the value of this valuable of my line an object number 80. 43 00:03:06,710 --> 00:03:12,200 OK so let me actually create another object here. 44 00:03:12,270 --> 00:03:12,960 OK. 45 00:03:12,960 --> 00:03:18,980 So again in order to create another object from this law class I just need to type in here relion. 46 00:03:19,300 --> 00:03:19,940 OK. 47 00:03:20,190 --> 00:03:26,660 The name of my object is my second line. 48 00:03:26,970 --> 00:03:27,930 OK. 49 00:03:27,930 --> 00:03:31,430 And then I use an assignment operator here. 50 00:03:31,650 --> 00:03:36,040 And then I use then you convert and then I'll refer to the name of my class. 51 00:03:36,120 --> 00:03:42,540 And then after the class name I put a pair of round brackets and then I put semicolon at the end of 52 00:03:42,540 --> 00:03:43,530 my statement. 53 00:03:43,600 --> 00:03:44,180 OK. 54 00:03:44,430 --> 00:03:47,740 So as you can see here are second the lion is now created. 55 00:03:47,910 --> 00:03:55,500 So now in order to make sure that our line is created and it is stored in silver inside the memory I 56 00:03:55,500 --> 00:04:03,450 just need to type in here system that out that print land and then inside the practices I can just refer 57 00:04:03,450 --> 00:04:05,630 to the name of my second line object. 58 00:04:05,640 --> 00:04:06,530 OK. 59 00:04:06,930 --> 00:04:10,140 And then at the end of my statement I need to put in a semicolon. 60 00:04:10,140 --> 00:04:19,500 So now if I run my project as you can see this is the address of our second line object inside the memory. 61 00:04:19,530 --> 00:04:23,390 OK so let me actually comment out this line of code here. 62 00:04:23,430 --> 00:04:31,580 And now I want to actually output the value of this valuable for this instance of the line class to 63 00:04:31,600 --> 00:04:32,620 the K.. 64 00:04:32,700 --> 00:04:40,410 So I just need to type in here system that out that print line inside Apprentice's. 65 00:04:40,620 --> 00:04:44,450 I just need to refer to the name of my second line object. 66 00:04:44,490 --> 00:04:46,730 So here I just need to type in here my. 67 00:04:46,860 --> 00:04:53,670 And then I use the autocomplete feature of the eclipse and then I choose the my second line object here. 68 00:04:53,820 --> 00:05:01,340 And then I posted the dotted notation here and here I can actually access this area of this like an 69 00:05:01,370 --> 00:05:01,880 object. 70 00:05:01,910 --> 00:05:02,510 OK. 71 00:05:02,870 --> 00:05:08,150 So if I choose this variable i need to put a semicolon at the end of my statement. 72 00:05:08,150 --> 00:05:14,050 So now if I had on my project as you can see the value of this value is now 100. 73 00:05:14,060 --> 00:05:14,790 OK. 74 00:05:15,020 --> 00:05:24,430 So as you can see here in line 15 I actually changed the value of this space variable for my client 75 00:05:24,470 --> 00:05:24,870 object. 76 00:05:24,890 --> 00:05:25,520 OK. 77 00:05:26,290 --> 00:05:32,740 But this sweet valley Bell is actually a copy of this speech. 78 00:05:32,740 --> 00:05:33,570 Valuable here. 79 00:05:33,580 --> 00:05:37,210 OK we are not actually changing the actual value. 80 00:05:37,300 --> 00:05:43,400 We are actually changing the value of a copy of this value. 81 00:05:43,410 --> 00:05:43,770 OK. 82 00:05:43,810 --> 00:05:50,740 This variable is dedicated specifically for every instance that we create from this class. 83 00:05:50,740 --> 00:05:51,280 OK. 84 00:05:51,550 --> 00:06:01,060 So if I for example changed the value of these spent valuable in line 15 it doesn't mean that we actually 85 00:06:01,060 --> 00:06:06,610 changed the value of these Spaeth valuable that we created inside the client class. 86 00:06:06,610 --> 00:06:09,690 We only changed the value of this variable. 87 00:06:09,700 --> 00:06:13,150 That is only for my client object here. 88 00:06:13,150 --> 00:06:19,520 OK but here in line 19 I decided to create another object from this line class. 89 00:06:19,660 --> 00:06:20,180 OK. 90 00:06:20,230 --> 00:06:25,720 And inside the main class I actually tried to output the value of this variable for this. 91 00:06:25,720 --> 00:06:28,060 My second line object to the console. 92 00:06:28,090 --> 00:06:28,460 OK. 93 00:06:28,480 --> 00:06:31,260 So as you can see here this value is 100. 94 00:06:31,380 --> 00:06:37,150 OK so this variable is actually a copy of this value. 95 00:06:37,180 --> 00:06:37,580 OK. 96 00:06:37,580 --> 00:06:46,240 When you actually access this variable from another class we are actually creating a copy of that variable 97 00:06:46,540 --> 00:06:47,550 here. 98 00:06:47,590 --> 00:06:54,310 So here if I for example want to change the speed of my second line object to another value I can just 99 00:06:54,310 --> 00:06:55,120 type in here. 100 00:06:55,240 --> 00:06:56,890 My second line. 101 00:06:57,240 --> 00:06:57,900 OK. 102 00:06:58,020 --> 00:06:59,510 That speed. 103 00:06:59,680 --> 00:07:04,280 And then I can assign another value to my variable for example number 30. 104 00:07:04,450 --> 00:07:07,710 And then at the end of my statement I need to put in a semicolon. 105 00:07:07,720 --> 00:07:16,490 So now if I want to output this value to the console I just need to type in her system that out that 106 00:07:16,630 --> 00:07:17,380 print Len 107 00:07:20,590 --> 00:07:27,460 and then inside the prentices I can just type in here my second line in that speech. 108 00:07:27,760 --> 00:07:28,350 OK. 109 00:07:28,540 --> 00:07:31,900 And then at the end of my statement I need to put in a semicolon. 110 00:07:31,930 --> 00:07:38,980 So now if I run my project as you can see the value of this bit valuable of this my second line object 111 00:07:39,010 --> 00:07:40,370 is now 50. 112 00:07:40,520 --> 00:07:41,050 OK. 113 00:07:41,110 --> 00:07:46,360 But the value of this sweet valuable of my life object is 80. 114 00:07:46,360 --> 00:07:46,930 OK. 115 00:07:46,990 --> 00:07:53,860 So when we actually access this valuable that we created inside this class from another class we are 116 00:07:53,860 --> 00:07:58,230 actually making another copy of that variable in our class. 117 00:07:58,240 --> 00:08:02,330 So because of that this variable is called instance variable. 118 00:08:02,370 --> 00:08:11,500 Ok this variable is dedicated for every instance that we create inside our main class. 119 00:08:11,500 --> 00:08:12,010 OK. 120 00:08:12,100 --> 00:08:19,210 So inside the main class in Lankton I decided to create an object from the slide in class and I named 121 00:08:19,270 --> 00:08:20,650 this object my lion. 122 00:08:20,660 --> 00:08:21,580 OK. 123 00:08:22,030 --> 00:08:29,260 And in line 14 I decided to output the value of this valuable through the console system that out that 124 00:08:29,270 --> 00:08:31,330 princeling my life and that speed. 125 00:08:31,360 --> 00:08:39,400 So here you are actually referring to the value of the copy of this variable. 126 00:08:39,520 --> 00:08:47,440 So for every instance that we create from this in class there is going to be another copy of these Spaeth 127 00:08:47,440 --> 00:08:50,140 variable for that specific object. 128 00:08:50,140 --> 00:08:50,900 OK. 129 00:08:51,100 --> 00:08:54,400 So if I for example want to create another object. 130 00:08:54,430 --> 00:08:59,800 First of all I just need to refer to the name of my class line the name of my object is. 131 00:08:59,800 --> 00:09:05,680 For example first line and then I put an assignment operator. 132 00:09:05,860 --> 00:09:12,940 And then I use the new key word here and then I refer to the name of my class and then I put a pair 133 00:09:12,940 --> 00:09:14,200 of round brackets here. 134 00:09:14,230 --> 00:09:17,910 And then at the end of my statement I need to put in a semi-colon OK. 135 00:09:18,340 --> 00:09:26,680 So now I just need to type in her system that out that print learn and then inside Apprentice's I just 136 00:09:26,680 --> 00:09:35,570 need to type in here ferde line that speed and then at the end of my statement I need to put in a semicolon. 137 00:09:35,650 --> 00:09:36,160 OK. 138 00:09:36,220 --> 00:09:40,040 So now if I run my project again this value is going to be 100. 139 00:09:40,060 --> 00:09:40,640 OK. 140 00:09:40,660 --> 00:09:41,300 Why. 141 00:09:41,440 --> 00:09:48,650 Because we are actually referring to the value of the copy of this variable. 142 00:09:48,910 --> 00:09:49,480 OK. 143 00:09:49,600 --> 00:09:56,410 So if you want to actually change the value of this Spizz valuable for this further like an object I 144 00:09:56,410 --> 00:10:01,540 just need to type in here first the line that speed is for example 20. 145 00:10:01,720 --> 00:10:02,430 OK. 146 00:10:02,680 --> 00:10:05,850 And then at the end of my statement I need to put in a semicolon.