1 00:00:01,690 --> 00:00:02,680 Hi everyone. 2 00:00:02,680 --> 00:00:08,800 So today we will start on your topic called woops object oriented programming. 3 00:00:08,890 --> 00:00:16,930 So object oriented programming is a programming style that involves classes and objects classes and 4 00:00:17,020 --> 00:00:22,900 objects so in this class we will learn the meaning of these two terms. 5 00:00:22,900 --> 00:00:30,010 Now let us first understand the meaning of an object so object is a basic entity that possesses some 6 00:00:30,010 --> 00:00:33,210 properties and functions in real world. 7 00:00:33,220 --> 00:00:35,710 We are surrounded with objects everywhere. 8 00:00:35,890 --> 00:00:39,440 For example laptop is an object and is an object. 9 00:00:39,490 --> 00:00:40,760 Table is an object. 10 00:00:40,770 --> 00:00:48,550 Change is an object etc. We want to involve these objects into our code because we want our code as 11 00:00:48,550 --> 00:00:50,560 close as to the real world. 12 00:00:50,560 --> 00:00:55,270 Okay let us first take an example suppose we have a student object 13 00:01:00,200 --> 00:01:03,230 and let's say a student has property called Name 14 00:01:06,300 --> 00:01:11,140 property or lumber a property. 15 00:01:11,160 --> 00:01:19,100 Let's say each address property and let's say contact number 16 00:01:22,050 --> 00:01:28,890 so these are some properties of Student object and we have functions. 17 00:01:29,130 --> 00:01:30,890 So what other functions functions are. 18 00:01:30,890 --> 00:01:37,710 The operation that we can perform on an object so let us take an example we can have a function called 19 00:01:38,580 --> 00:01:44,510 change address we can have a function central number 20 00:01:47,910 --> 00:01:48,970 and so on. 21 00:01:48,990 --> 00:01:54,700 Okay so object are the basic entities that will have some properties and functions. 22 00:01:54,750 --> 00:01:56,040 Now us go into the deal 23 00:01:59,760 --> 00:02:02,880 Suppose I want to create 20 students 24 00:02:06,230 --> 00:02:09,350 each student will have some properties. 25 00:02:09,350 --> 00:02:14,310 So the student object will have some properties. 26 00:02:14,710 --> 00:02:18,250 Let's say current living have only three properties and no functions. 27 00:02:18,250 --> 00:02:27,520 Okay three property and no function name a general number three properties and we want to create 20 28 00:02:27,520 --> 00:02:28,610 students. 29 00:02:29,050 --> 00:02:38,260 So we will create student number one at will have name it will have age and district and will have rule 30 00:02:38,250 --> 00:02:47,930 number similarly we will have as to name age number as three name age. 31 00:02:47,930 --> 00:02:52,490 Rule number and so on we will create 20 such students. 32 00:02:52,700 --> 00:02:53,700 So if we create. 33 00:02:53,720 --> 00:02:56,570 So if we will create object using this method. 34 00:02:56,570 --> 00:02:58,720 So this is a very hectic method okay. 35 00:02:58,730 --> 00:02:59,990 It will take us a lot of time. 36 00:03:00,740 --> 00:03:05,120 So what we use is a template called class. 37 00:03:05,270 --> 00:03:07,540 So what we will do we will create a template. 38 00:03:10,690 --> 00:03:20,760 So this template we'll have three properties name rule number and age. 39 00:03:20,940 --> 00:03:21,700 Okay. 40 00:03:21,980 --> 00:03:23,000 We have a template. 41 00:03:24,630 --> 00:03:29,330 And this template has three properties name rule number and age. 42 00:03:29,400 --> 00:03:33,120 So what we will do we will create a copy of this template 43 00:03:38,380 --> 00:03:40,830 and we will name it as. 44 00:03:40,990 --> 00:03:42,860 So we will have a name. 45 00:03:43,030 --> 00:03:44,410 We will have a rule number. 46 00:03:44,740 --> 00:03:46,910 And we will have each. 47 00:03:46,990 --> 00:03:52,330 Now after creating the copy we will fill that data Latin name is ABC. 48 00:03:52,330 --> 00:03:55,360 Rule number is tool a just 23. 49 00:03:55,380 --> 00:03:55,910 Okay. 50 00:03:55,930 --> 00:04:00,250 So we created a copy and then we will fill data. 51 00:04:00,250 --> 00:04:01,930 Let's say we will create and copy 52 00:04:05,250 --> 00:04:07,950 the name of these copies as true. 53 00:04:08,090 --> 00:04:09,460 It will have a name. 54 00:04:09,690 --> 00:04:13,350 It will have rule number and it will have each. 55 00:04:13,530 --> 00:04:15,800 And now it's time to fill that data. 56 00:04:15,810 --> 00:04:18,380 So let's say your name is X Y Z. 57 00:04:18,390 --> 00:04:20,150 Rule number is 24. 58 00:04:20,580 --> 00:04:24,260 And ages 50 to OK. 59 00:04:24,360 --> 00:04:30,710 So this template is called a class. 60 00:04:31,110 --> 00:04:40,230 And this copy of template is called Object similarly if you want to create more objects. 61 00:04:40,240 --> 00:04:47,860 We can we will create a copy we will have three fields name rule number and age. 62 00:04:47,860 --> 00:04:49,950 And then we will fill our data. 63 00:04:49,980 --> 00:04:50,410 Okay. 64 00:04:50,500 --> 00:04:52,670 So we have only one class. 65 00:04:53,260 --> 00:04:57,770 And we can create many objects what we have to do. 66 00:04:57,900 --> 00:05:00,870 Just copy that template and fill the data. 67 00:05:00,900 --> 00:05:01,330 Okay. 68 00:05:01,380 --> 00:05:05,550 So this is much much better as compared to this way. 69 00:05:06,290 --> 00:05:06,820 Okay. 70 00:05:06,930 --> 00:05:13,710 So and so if we will create the object using this this is very cumbersome method because all the objects 71 00:05:13,710 --> 00:05:16,380 have these same properties name age and all number. 72 00:05:16,410 --> 00:05:23,930 So it is better to create a template and this template will be called a class and then we will make 73 00:05:23,940 --> 00:05:25,190 copy and fill data. 74 00:05:25,560 --> 00:05:25,860 Okay. 75 00:05:25,890 --> 00:05:31,860 So object is make the copy and filter data make a copy for the data. 76 00:05:31,860 --> 00:05:32,160 Okay. 77 00:05:36,240 --> 00:05:43,040 Now I hope you got a rough idea so I will become more clear as we go in detail in the future lessons. 78 00:05:43,620 --> 00:05:45,980 So I think this is enough for three. 79 00:05:46,020 --> 00:05:48,840 Now let us see the code how we will create class. 80 00:05:48,840 --> 00:05:55,960 Let us see through a code so I have made a file with the name student dot CPB. 81 00:05:56,030 --> 00:05:56,470 Okay. 82 00:05:56,590 --> 00:06:01,720 So for creating a class we first have to write class keyword. 83 00:06:01,720 --> 00:06:03,160 And then the name of the class. 84 00:06:03,850 --> 00:06:05,200 So the name of the classes. 85 00:06:05,230 --> 00:06:05,890 STUDENT. 86 00:06:06,420 --> 00:06:06,940 OKAY. 87 00:06:06,940 --> 00:06:09,130 Opening record closing record. 88 00:06:09,130 --> 00:06:16,840 And this semicolon so let's say uh currently we have only two properties. 89 00:06:16,850 --> 00:06:17,420 Rule number 90 00:06:20,430 --> 00:06:21,890 and the second property. 91 00:06:21,940 --> 00:06:23,820 Let's age. 92 00:06:24,060 --> 00:06:24,590 Okay. 93 00:06:24,780 --> 00:06:27,080 So this is a way to create a class. 94 00:06:27,090 --> 00:06:29,490 This does index for creating a class. 95 00:06:29,520 --> 00:06:34,190 Okay first class keyword then name of the class. 96 00:06:34,320 --> 00:06:36,250 And then the properties. 97 00:06:36,630 --> 00:06:39,000 Currently we do not have any functions. 98 00:06:39,030 --> 00:06:40,730 Okay now let's see. 99 00:06:40,730 --> 00:06:46,270 When for example so this is a class called the product NCP. 100 00:06:46,420 --> 00:06:46,760 Sorry. 101 00:06:46,770 --> 00:06:49,220 This is a file called product or TPB. 102 00:06:49,310 --> 00:06:56,980 Let's make a class so class keyword then name of the class and then the name of the class is product 103 00:06:57,840 --> 00:07:00,760 opening record closing record and semicolon. 104 00:07:00,980 --> 00:07:01,230 Okay 105 00:07:04,950 --> 00:07:06,690 let's see this product. 106 00:07:06,690 --> 00:07:09,520 This product class has three properties. 107 00:07:09,540 --> 00:07:12,240 First is I.T.. 108 00:07:12,270 --> 00:07:20,040 Second is uh lower tech albeit and third is uh let's call the name of the product. 109 00:07:20,400 --> 00:07:26,060 So for name we have we need connectivity so connectivity. 110 00:07:26,100 --> 00:07:29,640 Let's say the size is 50 OK 111 00:07:34,410 --> 00:07:36,780 so we have a class called product. 112 00:07:36,780 --> 00:07:43,650 It has three properties I.T. vid and name and this doesn't have any functions yet. 113 00:07:44,520 --> 00:07:48,380 OK so now let us create object. 114 00:07:48,990 --> 00:07:52,430 So we will discuss in the next video How to create objects. 115 00:07:52,500 --> 00:08:00,060 So for objects what we have to do we have to make the copy of this class and then fill the data. 116 00:08:00,450 --> 00:08:02,100 Okay so let us revise. 117 00:08:03,000 --> 00:08:05,060 So what is the class. 118 00:08:05,310 --> 00:08:06,230 Classes. 119 00:08:06,520 --> 00:08:07,970 Basically a blueprint. 120 00:08:09,360 --> 00:08:12,100 Class is a blueprint. 121 00:08:12,470 --> 00:08:17,860 Let's take one more example let's say we have a class called God. 122 00:08:17,980 --> 00:08:18,570 Okay. 123 00:08:18,590 --> 00:08:19,540 Class God. 124 00:08:19,670 --> 00:08:30,320 So this GA template this class blueprint let's say have four properties uh name Marty Lambert 125 00:08:33,230 --> 00:08:36,590 let's say price and number of seats 126 00:08:40,230 --> 00:08:45,600 okay So class is a blueprint. 127 00:08:45,850 --> 00:08:52,840 Now we will make a copy C1. 128 00:08:52,890 --> 00:09:03,170 Now we will have all the properties name more lumber price and seat number of seats. 129 00:09:03,190 --> 00:09:06,230 And now it's time to fill the data. 130 00:09:06,250 --> 00:09:06,970 Okay. 131 00:09:06,970 --> 00:09:15,080 So let us the name is ABC model number two three forward price let's say 20 grand anti-gay and 30 seats 132 00:09:15,130 --> 00:09:15,580 are full. 133 00:09:16,560 --> 00:09:17,200 Okay. 134 00:09:17,530 --> 00:09:23,710 So this blueprint class is a blueprint so blueprint doesn't have data. 135 00:09:23,830 --> 00:09:24,190 Okay. 136 00:09:24,220 --> 00:09:26,200 These are empty. 137 00:09:26,200 --> 00:09:27,860 They are just the name of the field. 138 00:09:27,870 --> 00:09:31,460 They are only names that do not contain any data. 139 00:09:31,510 --> 00:09:36,040 If you want to fill the data what we will do we will make the copy of the template. 140 00:09:36,250 --> 00:09:40,430 Then we will have all the fields all the properties and then we will fill data. 141 00:09:40,480 --> 00:09:48,200 So objects are real world they are real while they are created after filling after filling the fields. 142 00:09:48,200 --> 00:09:49,160 Okay. 143 00:09:49,160 --> 00:09:55,820 So this is I always remember class using a blueprint class is a blueprint or a template 144 00:09:58,580 --> 00:10:01,400 and object to real voids. 145 00:10:01,400 --> 00:10:05,720 We will make the copy of the template and then we will fill the data. 146 00:10:05,720 --> 00:10:06,370 Okay. 147 00:10:06,710 --> 00:10:10,580 So in the next video we will learn how to create the object. 148 00:10:10,580 --> 00:10:11,820 Okay. 149 00:10:12,140 --> 00:10:17,720 In the next day we will learn how to create objects of class called product and objects of class called 150 00:10:17,930 --> 00:10:18,420 student. 151 00:10:19,220 --> 00:10:20,390 Okay thank you.