1 00:00:00,730 --> 00:00:08,510 Hire everyone in this theater all I'm going to go ahead and talk about using methods and objects together. 2 00:00:08,530 --> 00:00:09,130 OK. 3 00:00:09,370 --> 00:00:12,620 So first we need to create a Java project. 4 00:00:12,790 --> 00:00:19,550 So in order to create a Java project we need to click on this file new and then click on Java project. 5 00:00:19,570 --> 00:00:20,040 OK. 6 00:00:20,080 --> 00:00:28,190 So for the project name just type in here objects and methods. 7 00:00:28,300 --> 00:00:31,740 So as you can see here our project is now created. 8 00:00:31,750 --> 00:00:34,970 So first we need our class for our project. 9 00:00:35,140 --> 00:00:37,370 So just click on this as RC for that. 10 00:00:37,390 --> 00:00:45,610 Or you can click on these objects and methods project and then click on file name and click on class. 11 00:00:45,610 --> 00:00:52,960 So here for the class name just type in here Main and for the package name we need a reverse domain 12 00:00:52,960 --> 00:00:53,440 here. 13 00:00:53,440 --> 00:00:58,850 So I typed in here com that's my name and find out the project is public. 14 00:00:59,110 --> 00:01:06,010 And here make sure that you check this checkbox that says public static void main if it OK and then 15 00:01:06,010 --> 00:01:07,330 click on finish. 16 00:01:07,870 --> 00:01:11,640 So as you can see here our class is now created. 17 00:01:11,770 --> 00:01:15,270 So first let me actually delete this comment here. 18 00:01:15,670 --> 00:01:21,280 And then in order to make this a little earlier Vider I just need to double click undismayed that job 19 00:01:21,280 --> 00:01:22,650 I have here. 20 00:01:22,660 --> 00:01:26,020 So as you can see here our editor area is now much wider. 21 00:01:26,020 --> 00:01:29,450 And then we can actually write our coats in this method. 22 00:01:29,460 --> 00:01:29,770 OK. 23 00:01:29,770 --> 00:01:31,030 In this main method. 24 00:01:31,030 --> 00:01:35,030 So this main effect is the starting point for actually running. 25 00:01:35,080 --> 00:01:36,200 Our job coats. 26 00:01:36,220 --> 00:01:36,840 Okay. 27 00:01:37,030 --> 00:01:37,630 Okay. 28 00:01:37,810 --> 00:01:41,700 So first of all I want to create an object. 29 00:01:41,710 --> 00:01:42,430 Okay. 30 00:01:42,760 --> 00:01:51,400 So in order to create an object you need to have a blueprint in order to show me exactly how to create 31 00:01:51,850 --> 00:01:52,400 an object. 32 00:01:52,420 --> 00:01:53,030 OK. 33 00:01:53,320 --> 00:02:02,390 So in Java in order to have a blueprint for showing us how to create an object we need to create a class. 34 00:02:02,500 --> 00:02:03,000 OK. 35 00:02:03,130 --> 00:02:05,500 So our class is like a blueprint in Java. 36 00:02:05,500 --> 00:02:06,250 OK. 37 00:02:06,400 --> 00:02:09,350 So let's first create a class called liar. 38 00:02:09,550 --> 00:02:10,160 OK. 39 00:02:10,420 --> 00:02:16,140 So in order to create a class of we just need to click on this package here. 40 00:02:16,300 --> 00:02:17,030 OK. 41 00:02:17,410 --> 00:02:22,230 And then we need to click on File knew and then click on class. 42 00:02:22,240 --> 00:02:25,140 So for the class name just type in here line. 43 00:02:25,750 --> 00:02:30,220 And as you can see here it's going to actually put our class inside this package. 44 00:02:30,220 --> 00:02:30,680 OK. 45 00:02:30,700 --> 00:02:34,070 So that's why we actually clicked on this package. 46 00:02:34,150 --> 00:02:36,210 And then we started to create a class. 47 00:02:36,220 --> 00:02:36,780 OK. 48 00:02:36,820 --> 00:02:39,050 So for the modifiers the public. 49 00:02:39,190 --> 00:02:41,760 And then click on finish. 50 00:02:41,830 --> 00:02:45,250 So as you can see here our class is now created. 51 00:02:45,430 --> 00:02:51,520 OK now we need to actually put some instructions inside this class in order to actually show us how 52 00:02:51,520 --> 00:02:53,420 to create life and objects. 53 00:02:53,440 --> 00:02:54,160 OK. 54 00:02:54,160 --> 00:03:00,480 So as you can see here now that our client class is created we have our blueprint. 55 00:03:00,760 --> 00:03:01,280 OK. 56 00:03:01,450 --> 00:03:08,500 But there are no instructions in this blueprint in order to show us exactly what are the characteristics 57 00:03:08,800 --> 00:03:10,620 and behaviors of a lawyer. 58 00:03:10,770 --> 00:03:15,480 OK so now we can put some instructions inside this blueprint. 59 00:03:15,730 --> 00:03:20,300 So first I want to put the characteristics of a lion inside this class. 60 00:03:20,320 --> 00:03:20,930 OK. 61 00:03:21,250 --> 00:03:27,790 So the characteristics of a lion are for example and speed. 62 00:03:28,390 --> 00:03:32,980 And then I can assign a value to this variable for example number 90. 63 00:03:33,340 --> 00:03:34,060 OK. 64 00:03:34,340 --> 00:03:39,970 Int power for example 100. 65 00:03:40,270 --> 00:03:40,860 OK. 66 00:03:40,990 --> 00:03:43,250 So these are the characteristics of a liar. 67 00:03:43,300 --> 00:03:44,050 OK. 68 00:03:44,050 --> 00:03:47,620 Now you want to specify the behaviors of a lion. 69 00:03:47,620 --> 00:03:52,530 So for example the behaviors of a lion are for example a lion roll. 70 00:03:52,540 --> 00:03:53,110 OK. 71 00:03:53,290 --> 00:03:59,340 So in order to show their behaviors of an object we need to create Misfit's. 72 00:03:59,380 --> 00:04:04,470 So in order to show how my lawyer rolls we need to create a method. 73 00:04:04,660 --> 00:04:09,620 So I just let you type in here void and the name of my method is wrong. 74 00:04:09,960 --> 00:04:10,660 OK. 75 00:04:10,960 --> 00:04:15,330 And then I need to put in a pair of round brackets after my Meffert name. 76 00:04:15,520 --> 00:04:21,590 And then I need to open and close my Meffert by using an opening curly brace followed by our closing 77 00:04:21,610 --> 00:04:22,170 calibrates. 78 00:04:22,180 --> 00:04:22,650 OK. 79 00:04:22,780 --> 00:04:24,130 And then inside is left. 80 00:04:24,160 --> 00:04:26,260 I can put in my statements. 81 00:04:26,260 --> 00:04:29,840 So now you want to show how my lane roads. 82 00:04:30,040 --> 00:04:38,520 So I just made you type in here system that's out that pretty learn and an inside Apprentice's I put 83 00:04:38,530 --> 00:04:41,800 in two double quotes and the inside double quotes. 84 00:04:41,810 --> 00:04:43,470 I just tried roll 85 00:04:46,370 --> 00:04:50,070 and then at the end of my statement I need to put in a semi-colon. 86 00:04:50,420 --> 00:04:56,510 So this is how my lawyer was OK or for example El-Aurian runs OK. 87 00:04:56,750 --> 00:05:04,060 So I just need to type in here Voyt run and then I need to put in a pair of round brackets after my 88 00:05:04,320 --> 00:05:04,830 name. 89 00:05:05,060 --> 00:05:12,230 And then I need to open and close my fit by using an opening curly brace followed by our closing curly 90 00:05:12,230 --> 00:05:17,240 brace and then inside I'm afraid I can put my statements. 91 00:05:17,240 --> 00:05:19,250 So I just type in here system 92 00:05:21,920 --> 00:05:30,500 out that Princeton and then inside the apprentice's I can just put into double quotes and here I write 93 00:05:31,460 --> 00:05:34,460 run. 94 00:05:34,480 --> 00:05:36,770 So this is how my lion runs. 95 00:05:36,790 --> 00:05:37,420 OK. 96 00:05:37,480 --> 00:05:39,980 Or for example my lion fights. 97 00:05:40,000 --> 00:05:40,570 OK. 98 00:05:40,780 --> 00:05:42,200 So I just let you type in here. 99 00:05:42,230 --> 00:05:44,760 Voyt fight. 100 00:05:45,430 --> 00:05:52,000 And then I need to put in a pair of round brackets and then I need to open and close my left and then 101 00:05:52,000 --> 00:05:55,140 inside the Smurfette I can just put in my statements. 102 00:05:55,150 --> 00:06:03,250 So I just type in your system that out that Priestland and that inside the prentices I put into double 103 00:06:03,250 --> 00:06:07,610 coats and that inside the double quotes I right fight 104 00:06:11,170 --> 00:06:19,390 thought this is how my lion fights OK or for example my lion sleeps. 105 00:06:19,440 --> 00:06:21,990 So again I can just I've been here voit. 106 00:06:22,260 --> 00:06:27,970 So as you can see here the return type of mine if it is void my method is going to return nothing. 107 00:06:28,050 --> 00:06:28,720 OK. 108 00:06:28,920 --> 00:06:30,470 It's just going to actually do something. 109 00:06:30,510 --> 00:06:31,280 OK. 110 00:06:31,650 --> 00:06:39,160 And the name of my method is sleep and then I need to put in a pair of round brackets after them if 111 00:06:39,150 --> 00:06:39,850 at any. 112 00:06:40,230 --> 00:06:45,750 And then I need to open and close my Minford by using these curly braces as you can see here. 113 00:06:46,260 --> 00:06:49,830 And that inside this method I can put in my statements. 114 00:06:50,040 --> 00:06:55,560 So I just type in here system that out that princeling. 115 00:06:56,010 --> 00:07:02,090 And then inside the prentices I can't just put into double coats and then inside the double quotes. 116 00:07:02,370 --> 00:07:09,750 I just right sleep so this is how my lion sleeps. 117 00:07:09,760 --> 00:07:10,330 OK. 118 00:07:10,570 --> 00:07:17,700 So now that's my blueprint is ready we can actually create loyal objects from this class. 119 00:07:17,710 --> 00:07:18,730 OK. 120 00:07:18,730 --> 00:07:24,330 So inside the main class and then inside the main Mfat I can create an object. 121 00:07:24,340 --> 00:07:29,610 So first of all I need to refer to the name of my class line. 122 00:07:30,610 --> 00:07:31,480 OK. 123 00:07:31,870 --> 00:07:35,630 And the name of my object is my lawyer. 124 00:07:36,130 --> 00:07:43,710 And that I need to between an assignment operator here and then I put in this key vote new. 125 00:07:44,140 --> 00:07:45,060 OK. 126 00:07:45,610 --> 00:07:53,200 And then again I need to refer to the name of my class and then I need to put in a pair of round brackets 127 00:07:53,260 --> 00:07:54,320 after my class. 128 00:07:54,400 --> 00:07:55,060 OK. 129 00:07:55,390 --> 00:08:00,590 And then I need to put a semi-colon at the end of my statements. 130 00:08:00,610 --> 00:08:08,180 So as you can see here first of all I referred to the name of my class line and I gave my object a name. 131 00:08:08,470 --> 00:08:09,060 OK. 132 00:08:09,430 --> 00:08:12,150 And then I put an assignment operator here. 133 00:08:12,550 --> 00:08:15,560 And then I put this key vote here knew. 134 00:08:15,780 --> 00:08:22,420 OK so here we are actually telling the computer that if you are going to actually create a new object 135 00:08:22,840 --> 00:08:24,320 from this loincloths. 136 00:08:24,340 --> 00:08:25,100 OK. 137 00:08:25,420 --> 00:08:29,070 So that's the job of this new Q-Bot here. 138 00:08:29,470 --> 00:08:34,820 And then you are actually telling Dad we are going to create a new object from this class. 139 00:08:34,840 --> 00:08:35,210 OK. 140 00:08:35,230 --> 00:08:41,020 So first of all you are actually referring to the name of our class and then we are actually giving 141 00:08:41,110 --> 00:08:48,830 our object a name and then we use this assignment operator and then we're actually instantiating our 142 00:08:48,940 --> 00:08:49,340 object. 143 00:08:49,350 --> 00:08:50,030 OK. 144 00:08:50,080 --> 00:08:53,980 You are actually creating a new object from this class. 145 00:08:53,980 --> 00:08:59,270 So as you can see here our object is now created inside a memory. 146 00:08:59,290 --> 00:09:06,340 So now in order to show you how my object is created and what is the address of my object inside the 147 00:09:06,340 --> 00:09:06,930 memory. 148 00:09:07,090 --> 00:09:15,550 I just need to type in here system that out that learn and then inside the apprentice's I can just refer 149 00:09:15,550 --> 00:09:17,710 to the name of my object my lawyer. 150 00:09:17,800 --> 00:09:21,080 And then at the end of my statement I need to put in a semicolon. 151 00:09:21,400 --> 00:09:27,940 So now if I run on my project as you can see this is the address of my lawyer an object inside the memory. 152 00:09:27,940 --> 00:09:34,030 Ok this is just a way to show you that our object is actually created inside a memory. 153 00:09:34,030 --> 00:09:34,730 OK. 154 00:09:34,780 --> 00:09:39,130 And this is the address of this my client object inside the memory OK.