1 00:00:01,730 --> 00:00:02,420 Hello everyone. 2 00:00:02,450 --> 00:00:08,000 So in this session we will learn about strategic properties have a glass let us take an example. 3 00:00:08,030 --> 00:00:10,250 So I have this glass student. 4 00:00:10,250 --> 00:00:12,710 So this student class has three public properties. 5 00:00:12,710 --> 00:00:14,980 Rule number eight and total student. 6 00:00:15,000 --> 00:00:19,290 So told to go inside the total number of students present in the class. 7 00:00:19,340 --> 00:00:19,800 OK. 8 00:00:19,850 --> 00:00:24,980 So whenever we create a new student what will happen the value of the industrial dance will be incremented 9 00:00:24,980 --> 00:00:29,610 by when initially we can assume that the value of total strawberry inside zero. 10 00:00:29,640 --> 00:00:30,160 Okay. 11 00:00:30,230 --> 00:00:31,640 So when we create an object 12 00:00:36,060 --> 00:00:44,190 to indicate an object student S1 what will happen all the three properties will be copied. 13 00:00:44,220 --> 00:00:48,960 So rule number age and told us twins 14 00:00:54,180 --> 00:00:59,610 now add this line default constructor in both to default constructor will be called. 15 00:00:59,640 --> 00:01:01,910 So rule number will contain garbage value. 16 00:01:01,920 --> 00:01:05,820 Age will contain garbage value and total students will contain garbage value. 17 00:01:05,850 --> 00:01:14,010 Similarly if I create and I the student student s do so again all these three properties will be copied. 18 00:01:14,170 --> 00:01:20,350 So student as to the number three surrenders to each and student test to total students 19 00:01:24,000 --> 00:01:30,430 so add this line in bold default constructively recorded serial number will contain garbage value. 20 00:01:30,450 --> 00:01:36,570 Age will contain garbage value and that older students will contain garbage will you see what's happening 21 00:01:36,570 --> 00:01:45,290 here is each student should average on the lumber each student should have its own age each student 22 00:01:45,410 --> 00:01:47,220 should have its own total student. 23 00:01:47,240 --> 00:01:48,070 Now this is wrong. 24 00:01:48,080 --> 00:01:49,960 This is a very weird statement. 25 00:01:49,970 --> 00:01:52,890 Okay so each student will have its own no no. 26 00:01:52,910 --> 00:01:53,840 This is correct. 27 00:01:53,840 --> 00:01:55,700 Each student will have it one each. 28 00:01:55,700 --> 00:01:59,550 This is also correct but each student will have its total student. 29 00:01:59,610 --> 00:02:01,380 Now this is kind of weird. 30 00:02:01,400 --> 00:02:02,910 It's a very weird statement. 31 00:02:03,140 --> 00:02:09,920 So the property told us to rent the property told us to rent this property is the combined property 32 00:02:09,920 --> 00:02:13,670 of all the students and it is not the property of a single student. 33 00:02:14,030 --> 00:02:18,150 Okay so the value of the student should be same for all the objects. 34 00:02:18,230 --> 00:02:20,090 It will never happen that forced to rent. 35 00:02:20,100 --> 00:02:25,490 That's when the value of the through interest then for us to total students are 20 and for a state or 36 00:02:25,490 --> 00:02:26,300 through a third party. 37 00:02:26,300 --> 00:02:27,620 It will never happen. 38 00:02:27,800 --> 00:02:33,080 So the value of this property the value of the total Australian property will be same as a number of 39 00:02:33,080 --> 00:02:34,550 students created. 40 00:02:34,580 --> 00:02:37,100 So this property does not belong to object. 41 00:02:37,100 --> 00:02:39,590 This property belongs to a class. 42 00:02:39,590 --> 00:02:45,950 Okay so the report the value of total US students at one place inside the class and whoever wants to 43 00:02:45,950 --> 00:02:51,060 access the to the student it will go and ask the class. 44 00:02:51,260 --> 00:02:58,170 Okay so the properties which belongs to a class will declare them static using the static guild. 45 00:02:58,220 --> 00:03:03,650 Okay so the properties which belongs to a class will declare them static using this tactic given before 46 00:03:03,650 --> 00:03:04,780 the integer. 47 00:03:05,040 --> 00:03:08,200 We will write static keyword before the integer. 48 00:03:08,420 --> 00:03:18,510 Okay so what are static properties so static properties are those properties which belongs to a class 49 00:03:19,550 --> 00:03:26,050 so these properties belongs to a class and not a single object and not a single student. 50 00:03:26,190 --> 00:03:31,860 Okay so what will happen to the static properties separate copies not created for each object. 51 00:03:32,460 --> 00:03:38,820 Okay so we can access a static property only using classes. 52 00:03:38,930 --> 00:03:41,660 So what we will do we will write. 53 00:03:41,660 --> 00:03:46,500 Static int total student. 54 00:03:50,660 --> 00:03:53,810 We will update this line and we will use the keyword. 55 00:03:53,840 --> 00:03:55,820 Static int to the students. 56 00:03:55,820 --> 00:03:58,840 Now what will happen if you will create an object. 57 00:04:00,140 --> 00:04:06,780 Student S1 so whenever we create an object only the non static properties get copied so roll number 58 00:04:06,780 --> 00:04:07,940 and age. 59 00:04:07,940 --> 00:04:09,890 They both are non-strategic properties. 60 00:04:09,920 --> 00:04:12,760 So by default the properties are non static. 61 00:04:12,890 --> 00:04:18,740 So whenever we create a new object only the non-strategic properties will be copied so roll number and 62 00:04:18,770 --> 00:04:22,310 each these two properties will get copied. 63 00:04:22,310 --> 00:04:28,160 Total students will not be copied and it will contain garbage value because their default construct 64 00:04:28,160 --> 00:04:28,880 can we be called. 65 00:04:29,240 --> 00:04:34,040 Similarly if you will create an ideal object let's call it student S2. 66 00:04:34,430 --> 00:04:37,120 So only the non static properties will be copied. 67 00:04:37,130 --> 00:04:41,240 Static properties are not copied static properties belong to class. 68 00:04:41,720 --> 00:04:47,060 So at this line default constructor will be called and rule number and H contains the garbage will. 69 00:04:47,990 --> 00:04:56,270 Okay so one thing to remember is only the copy of non-strategic property view only copy non-strategic 70 00:04:56,400 --> 00:04:56,970 properties 71 00:05:01,340 --> 00:05:05,920 Okay so separate copy is not created for each object. 72 00:05:05,990 --> 00:05:08,100 When we declare them static. 73 00:05:08,300 --> 00:05:12,570 Okay so student loans students will not be copied. 74 00:05:12,650 --> 00:05:14,550 So what will happen to the students. 75 00:05:14,570 --> 00:05:16,160 So we have a student class 76 00:05:18,920 --> 00:05:24,330 we have student class this student class has three properties. 77 00:05:24,400 --> 00:05:30,530 Rule number which doesn't have any value age which does not have any value. 78 00:05:30,850 --> 00:05:32,580 And it will have total student. 79 00:05:32,590 --> 00:05:34,660 Now let's say the value is 20. 80 00:05:34,710 --> 00:05:35,120 Okay. 81 00:05:35,200 --> 00:05:36,350 So too does student. 82 00:05:36,430 --> 00:05:39,240 Now is a part of student class. 83 00:05:39,340 --> 00:05:42,680 So we have this student class okay. 84 00:05:42,720 --> 00:05:44,450 Now how can we access the role. 85 00:05:44,470 --> 00:05:45,810 But okay. 86 00:05:45,840 --> 00:05:46,760 So do accessibility. 87 00:05:46,790 --> 00:05:48,270 But we need to give it our object. 88 00:05:48,660 --> 00:05:48,910 Okay. 89 00:05:48,930 --> 00:05:56,310 We can access rule number using an object so the accessible number we will write object name dot Roland 90 00:05:56,310 --> 00:06:04,470 but via we need object because rule number is a non static property rule number is on static property 91 00:06:04,740 --> 00:06:06,500 to access a non-strategic property. 92 00:06:06,510 --> 00:06:11,340 We need object to us on order number of similarly installed order number. 93 00:06:11,880 --> 00:06:13,160 And so on. 94 00:06:13,170 --> 00:06:13,500 Okay. 95 00:06:13,770 --> 00:06:19,080 But how can we exist to the student property so told us when property is a static property. 96 00:06:19,080 --> 00:06:24,750 So if I if I will write if I tried to print the value S-1 Dodd told us to rent. 97 00:06:24,780 --> 00:06:25,890 What will happen. 98 00:06:25,890 --> 00:06:27,470 So obviously this line is wrong. 99 00:06:27,470 --> 00:06:28,140 Why. 100 00:06:28,170 --> 00:06:35,040 Because if we'll see it if you will see S1 so S1 does not have any property to the student. 101 00:06:35,100 --> 00:06:36,930 So obviously this line will throw us at it. 102 00:06:37,680 --> 00:06:38,030 Okay. 103 00:06:38,040 --> 00:06:42,220 Because S1 does not have any property to the student. 104 00:06:42,360 --> 00:06:43,910 So this line is wrong. 105 00:06:43,920 --> 00:06:46,310 Now how can we access to the student property. 106 00:06:46,560 --> 00:06:48,590 So total destroying property is a state property. 107 00:06:48,600 --> 00:06:52,630 And I told you static property belongs to a class too. 108 00:06:52,860 --> 00:06:58,070 If you want to access to truly stolen property we have to access it using glass. 109 00:06:58,110 --> 00:07:01,760 So first we have to write last name student. 110 00:07:02,190 --> 00:07:06,990 Then scope resolution operator and then the static property. 111 00:07:06,990 --> 00:07:08,750 The name of district property. 112 00:07:08,790 --> 00:07:10,890 So this is class name 113 00:07:14,940 --> 00:07:29,030 this operator we call it scope resolution operator scope resolution operator and then the name of these 114 00:07:29,030 --> 00:07:33,830 static properties so this is our static property total student. 115 00:07:34,060 --> 00:07:42,130 Okay so this is how we access this is how we can access a static property okay using the glass using 116 00:07:42,130 --> 00:07:42,750 the class. 117 00:07:42,760 --> 00:07:43,440 Okay. 118 00:07:43,450 --> 00:07:50,220 Now how do initialize our static property so static property can only be initialized outside the class. 119 00:07:50,380 --> 00:07:50,670 Okay. 120 00:07:50,680 --> 00:07:56,470 Static properties are initialized outside the class and the syntax is very simple. 121 00:07:56,470 --> 00:08:00,520 We have to write in digit we have right integer here but we will. 122 00:08:00,520 --> 00:08:05,620 But we again have to write in digit then the name of the class. 123 00:08:05,890 --> 00:08:10,190 Then scope resolution operator then the static property name with a static property. 124 00:08:10,390 --> 00:08:12,010 And then it's a value. 125 00:08:12,040 --> 00:08:14,180 So this is how we initialize a class. 126 00:08:14,200 --> 00:08:17,220 This is how we initialize a static property. 127 00:08:17,260 --> 00:08:17,630 Okay. 128 00:08:17,650 --> 00:08:24,250 So static property can only be initialized outside the class so letting good. 129 00:08:24,430 --> 00:08:29,800 So first of all we have to make this property static property because this property is combined for 130 00:08:29,830 --> 00:08:30,950 all the objects. 131 00:08:31,090 --> 00:08:33,570 It is not it does not belong to us investment. 132 00:08:33,580 --> 00:08:36,580 It belongs to a class. 133 00:08:36,600 --> 00:08:42,110 Now I told you if you want to initialize a static property it can be initialized only outside the class. 134 00:08:42,210 --> 00:08:44,620 So we have to write in beta again. 135 00:08:44,820 --> 00:08:47,220 Okay we have to write and digit again. 136 00:08:47,220 --> 00:08:53,040 Then the name of the class which is a student and then scope resolution operator column column then 137 00:08:53,700 --> 00:08:58,900 the name of the property may not name of destructive property and now its value. 138 00:08:59,100 --> 00:08:59,850 Okay. 139 00:08:59,880 --> 00:09:02,100 So initialize 140 00:09:07,280 --> 00:09:09,080 static get a member 141 00:09:12,780 --> 00:09:13,040 okay. 142 00:09:13,050 --> 00:09:18,500 So you have to remembered that we can only initialize distracting properties outside the class. 143 00:09:19,270 --> 00:09:22,760 Okay now let us create some objects 144 00:09:29,290 --> 00:09:30,130 student s 1. 145 00:09:30,130 --> 00:09:30,910 Now what will happen. 146 00:09:30,910 --> 00:09:32,870 Default constructor will be called. 147 00:09:32,890 --> 00:09:34,360 Now let us try to print. 148 00:09:34,360 --> 00:09:35,860 Now let us try to print it. 149 00:09:35,860 --> 00:09:43,310 Rule number in each property so as one dot rule number we can access or no because inseparable property 150 00:09:46,220 --> 00:09:54,910 and similarly let us try to print its age so our son daughter age and Lane Now let us try to print the 151 00:09:54,910 --> 00:10:01,390 value of total student since 2 the student deserve a static property we will access it using the class. 152 00:10:01,630 --> 00:10:09,400 So class name school resolution operator and then the name of the static property okay. 153 00:10:09,800 --> 00:10:11,040 So what should be our output. 154 00:10:11,330 --> 00:10:17,100 So at this line what will happen default constructor will be called so roll number and age board contain 155 00:10:17,280 --> 00:10:19,680 the garbage value so garbage will be printed. 156 00:10:19,680 --> 00:10:21,760 Then again garbage will be printed. 157 00:10:21,760 --> 00:10:24,210 And what is the value of to the student. 158 00:10:24,210 --> 00:10:29,400 So if we see this called the value of the students we initialize it to zero s but should be garbage 159 00:10:29,400 --> 00:10:31,420 will look garbage value and zero. 160 00:10:32,220 --> 00:10:35,190 Okay so let us run this file. 161 00:10:35,550 --> 00:10:36,690 Now we will run this file 162 00:10:40,800 --> 00:10:48,150 so garbage value garbage value and then zero 0 okay solver code is working fine. 163 00:10:48,150 --> 00:10:48,580 Okay. 164 00:10:48,750 --> 00:10:52,050 So everything we discussed is working fine. 165 00:10:52,200 --> 00:10:54,330 Now what will happen if I write 166 00:10:58,810 --> 00:11:02,380 if I am planning to access the code of student property using the object. 167 00:11:02,380 --> 00:11:04,890 Then what will happen. 168 00:11:05,110 --> 00:11:08,040 Okay so outline number 9. 169 00:11:08,040 --> 00:11:09,750 What will happen what will be our output. 170 00:11:10,410 --> 00:11:12,380 Okay so let us run our file. 171 00:11:12,420 --> 00:11:14,850 Let us rent and see what will you add output 172 00:11:18,940 --> 00:11:20,840 so the output is coming out to be 0. 173 00:11:21,970 --> 00:11:22,960 It's very strange. 174 00:11:22,960 --> 00:11:25,680 The output is coming out too busy to solve a code is working. 175 00:11:25,780 --> 00:11:29,320 Campbell is not throwing us any at it but logically this is incorrect. 176 00:11:29,330 --> 00:11:36,730 Okay logic it's incorrect but Campbell is allowing us to do this why it is logically incorrect because 177 00:11:36,880 --> 00:11:42,990 student s one does not have any property with denim told us to rinse okay. 178 00:11:43,070 --> 00:11:50,970 Now what will happen if I try to change the value of total students so S1 dot told us to rent. 179 00:11:50,970 --> 00:11:56,010 Let's make it 20 Okay now let us create an ideal object. 180 00:11:56,010 --> 00:12:06,110 Student s to and let us try to print the value of the students using the object as to so as to dot to 181 00:12:06,250 --> 00:12:14,450 restaurant. 182 00:12:14,490 --> 00:12:21,000 So what I'm doing here is I am trying to change the value of those students using the object S1 and 183 00:12:21,000 --> 00:12:26,610 then I am creating a new object a new student S2 and then I am trying to print the total the value of 184 00:12:26,700 --> 00:12:32,510 the student using the object as to so logically this line is wrong. 185 00:12:32,520 --> 00:12:32,790 Why. 186 00:12:32,790 --> 00:12:36,670 Because student 1 doesn't have any property with the name to the student. 187 00:12:36,690 --> 00:12:40,670 Similarly this line is also wrong but compiler allow us to do this. 188 00:12:40,700 --> 00:12:40,920 Okay 189 00:12:43,870 --> 00:12:47,540 so I see the value of those students is 20. 190 00:12:47,620 --> 00:12:53,140 If we accept that Telstra destroying property using the object as too so why does coming out with 20. 191 00:12:53,230 --> 00:12:53,740 Let's see 192 00:13:00,130 --> 00:13:03,210 so I told you the property to the student. 193 00:13:03,220 --> 00:13:04,600 This is a static property. 194 00:13:04,600 --> 00:13:06,080 It will not get copied. 195 00:13:06,280 --> 00:13:11,690 So we have student class inside the student class. 196 00:13:11,810 --> 00:13:13,560 We have this property to the students. 197 00:13:13,610 --> 00:13:15,310 So there is only one memory block. 198 00:13:15,320 --> 00:13:17,180 There is only one. 199 00:13:17,180 --> 00:13:17,560 Okay. 200 00:13:17,600 --> 00:13:19,040 It will not get copied. 201 00:13:19,040 --> 00:13:23,330 So at this line I am trying to access to the student property so what. 202 00:13:23,340 --> 00:13:24,580 Object Lesson will do. 203 00:13:24,650 --> 00:13:26,060 It will go to class. 204 00:13:26,060 --> 00:13:27,010 It will reach class. 205 00:13:27,020 --> 00:13:30,290 It will lose history ruling class and it will try to redo its property. 206 00:13:30,290 --> 00:13:31,810 So initially it was zero. 207 00:13:31,850 --> 00:13:39,080 So without the zero then I am changing the value of total student so S1 it will reach the student class 208 00:13:39,440 --> 00:13:44,550 and it will change the total Australian property which is it now becomes 20 --. 209 00:13:44,630 --> 00:13:52,700 Then I am creating a new object as to as to draw total student so the object is to reach the class and 210 00:13:52,700 --> 00:13:59,390 it will read the total student value which is twenty so twenty will get printed and similarly when I 211 00:13:59,390 --> 00:14:01,990 am printing the value of total student which is 20. 212 00:14:02,060 --> 00:14:09,920 Okay so we can change we can change the value of static property using any object okay using any object 213 00:14:09,950 --> 00:14:13,570 we can change its properties but logically it's incorrect okay. 214 00:14:13,730 --> 00:14:17,170 Logically it is incorrect but compiler allow us to do this. 215 00:14:17,300 --> 00:14:18,860 Okay but we should not do this. 216 00:14:18,980 --> 00:14:24,180 If you want to access the static properties accessed using the name of the class. 217 00:14:24,230 --> 00:14:28,400 Okay so logically it is incorrect but compiler allow us to do this. 218 00:14:28,410 --> 00:14:29,680 Okay. 219 00:14:29,920 --> 00:14:31,690 Now let's see. 220 00:14:31,690 --> 00:14:33,840 So as we discussed in the starting of the video. 221 00:14:33,910 --> 00:14:37,350 So as we're discussing the starting of the video our aim is very simple. 222 00:14:37,360 --> 00:14:43,670 As soon as we create a new object the value of the stolen property should be incremented by 1. 223 00:14:43,690 --> 00:14:44,000 Okay. 224 00:14:44,020 --> 00:14:49,560 If I create tools to rent then the value of p s total student property will they will. 225 00:14:49,720 --> 00:14:53,610 If I create dense rent the value of the certain property will return. 226 00:14:54,120 --> 00:14:54,380 Okay. 227 00:14:54,400 --> 00:14:55,870 So how to do this. 228 00:14:56,140 --> 00:15:00,520 So we know how to initialize to different how to initialize a static property. 229 00:15:00,520 --> 00:15:06,590 We know how to access a static property but we do not know how to update a static property. 230 00:15:06,610 --> 00:15:09,570 Okay so what we can do is we can. 231 00:15:09,610 --> 00:15:12,220 We can take the help of a constructor. 232 00:15:12,250 --> 00:15:12,480 Okay. 233 00:15:12,490 --> 00:15:18,310 So what will happen whenever we create our object constructor will be called and inside the constructor 234 00:15:18,460 --> 00:15:21,590 we will write to those two rent plus plus. 235 00:15:21,610 --> 00:15:32,160 Okay so I am planning to create a constructor so we know when the object will be created constructor 236 00:15:32,170 --> 00:15:36,940 will be called and inside the constructor we will write to the student plus press. 237 00:15:37,550 --> 00:15:37,840 Okay. 238 00:15:37,870 --> 00:15:42,190 So in this way the value of clustering the property will be incremented okay. 239 00:15:43,240 --> 00:15:47,600 So let us delete all this called. 240 00:15:47,740 --> 00:15:53,260 Now let us create a student so a student has to now let us create more students. 241 00:15:53,290 --> 00:15:57,930 Student as 3 as food as 5. 242 00:15:58,000 --> 00:16:03,650 So after creating face to rent I am trying to print the value of total student. 243 00:16:03,730 --> 00:16:05,620 Okay so what should be our output. 244 00:16:05,710 --> 00:16:10,720 Let's see. 245 00:16:10,860 --> 00:16:12,680 Okay so why is this coming out to be zero. 246 00:16:12,690 --> 00:16:20,860 Because after doing changes to this file after doing industrialist failed before God to this file. 247 00:16:21,060 --> 00:16:22,080 Now we will read this file. 248 00:16:24,350 --> 00:16:32,790 See no doubt produce coming out to be 5 via 5 because because first the constructor is called Forced 249 00:16:32,790 --> 00:16:37,030 to index 1 so told us restaurant become 1 then the constructor is called for this too. 250 00:16:37,090 --> 00:16:42,100 So the value of Telstra and property becomes two and then the constructor will be called for student 251 00:16:42,170 --> 00:16:44,330 S3 as food and is 5. 252 00:16:44,350 --> 00:16:49,620 So in this way the value of total student property became 5 okay. 253 00:16:49,830 --> 00:16:56,400 So just like that starting with the members we can make functions statically so okay we can make static 254 00:16:56,400 --> 00:17:04,090 functions also so suppose I have a function and to get William but 255 00:17:07,290 --> 00:17:09,000 I a function get on them. 256 00:17:09,010 --> 00:17:15,670 But so what this function will do it simply will return the roll number 257 00:17:18,740 --> 00:17:22,130 okay now dysfunction get really embodies object dependent function. 258 00:17:22,130 --> 00:17:25,620 This function depends on the object and object will like this function. 259 00:17:25,670 --> 00:17:28,950 So by default this function is an offset to function. 260 00:17:29,120 --> 00:17:34,690 So by default every function and by default everyday demand men but they are non static. 261 00:17:34,700 --> 00:17:35,160 Okay. 262 00:17:35,270 --> 00:17:40,010 So by default this is non static since this function is known instead start again object will call this 263 00:17:40,010 --> 00:17:43,930 function S1 dot getter William but astronaut good William. 264 00:17:43,940 --> 00:17:48,190 But still we need an object to call this function okay. 265 00:17:48,230 --> 00:17:57,780 Now what I want to do is now let's make this property a private property now since this property is 266 00:17:57,780 --> 00:17:59,220 a private property. 267 00:17:59,220 --> 00:18:02,110 We need a getter function to access this property. 268 00:18:02,250 --> 00:18:04,860 So let us create a getter function. 269 00:18:04,860 --> 00:18:10,420 So in get to those rent 270 00:18:15,850 --> 00:18:26,610 to what this function will do it will return to restaurants Okay so we will make this function as a 271 00:18:26,620 --> 00:18:27,940 static function. 272 00:18:27,940 --> 00:18:29,980 So after writing The Giver static. 273 00:18:29,980 --> 00:18:34,650 Now this function belongs to a class object will not be able to call this function. 274 00:18:34,660 --> 00:18:39,190 Okay so S1 dot get to the student astronaut get restaurants. 275 00:18:39,190 --> 00:18:40,210 These are wrong. 276 00:18:40,390 --> 00:18:48,440 How we will call this function so I told you this function belongs to a class so does index to excess 277 00:18:48,490 --> 00:18:53,090 that start to function is the name of the glass school resolution operator. 278 00:18:53,840 --> 00:18:59,950 And the name of the function name of the static function which is get total student. 279 00:19:00,110 --> 00:19:06,080 So this is how we will call this function if you will write as DA to get to those rent. 280 00:19:06,160 --> 00:19:12,780 Now this is logically wrong why this is logically wrong because this function is a static function and 281 00:19:12,780 --> 00:19:13,440 static means. 282 00:19:13,440 --> 00:19:17,600 This belongs to class and not to an object okay. 283 00:19:19,620 --> 00:19:21,690 Now there are a few properties. 284 00:19:21,690 --> 00:19:25,950 There are a few important things that we should know about the static functions. 285 00:19:25,950 --> 00:19:32,010 Okay so few properties of destructive function nodes. 286 00:19:32,180 --> 00:19:33,600 So the first thing. 287 00:19:33,750 --> 00:19:40,130 So the first thing is static functions can only exist static properties whether it is a data member 288 00:19:40,220 --> 00:19:41,540 or a function. 289 00:19:41,540 --> 00:19:47,960 Okay so the function can only exist static properties whether it is indeed a member or a function. 290 00:19:47,960 --> 00:19:50,360 We cannot use non-strategic function. 291 00:19:50,360 --> 00:19:53,900 We cannot use non-strategic the member inside a static function. 292 00:19:53,900 --> 00:19:58,030 And also we cannot call non-strategic functions. 293 00:19:58,290 --> 00:20:01,370 Okay so static function 294 00:20:05,340 --> 00:20:20,800 can only access static data members start to the members and can call only static functions. 295 00:20:25,550 --> 00:20:29,540 So for example get told us when this is a static function. 296 00:20:29,540 --> 00:20:37,060 So if you will right here return age then this is wrong. 297 00:20:37,060 --> 00:20:42,700 Error will be added because the first property of static function is the can only exist static data 298 00:20:42,710 --> 00:20:48,250 members and they can only call static functions okay. 299 00:20:48,280 --> 00:20:55,330 Now the second property of the static functions are static function do not have access do not have discovered 300 00:20:56,520 --> 00:21:00,000 static function do not have discovered. 301 00:21:00,000 --> 00:21:04,610 Okay because we do not call static function to an object. 302 00:21:04,650 --> 00:21:08,180 So what happened is this is a normal function. 303 00:21:08,180 --> 00:21:10,660 So to call this normal function we need an object. 304 00:21:10,920 --> 00:21:20,210 So as one dot get rule number so this object will be stored in that this keyword of this function. 305 00:21:20,220 --> 00:21:26,940 Now when we have static function so for calling the static function we do not need an object since we 306 00:21:26,940 --> 00:21:28,530 do not need an object. 307 00:21:28,530 --> 00:21:30,850 We do not need this operator. 308 00:21:31,050 --> 00:21:31,610 Okay. 309 00:21:31,680 --> 00:21:37,860 So these are the two very important properties of static functions first static function can only have 310 00:21:37,860 --> 00:21:42,820 access of the static grid members and they can only call static function. 311 00:21:42,870 --> 00:21:48,210 Second properties starting function do not have this keyword because we do not use object to call these 312 00:21:48,210 --> 00:21:49,000 functions. 313 00:21:49,020 --> 00:21:49,470 Okay. 314 00:21:49,530 --> 00:21:52,230 So this is all about static properties of a glass. 315 00:21:52,350 --> 00:21:53,640 We can make a data member. 316 00:21:53,670 --> 00:21:57,230 Static and we can also make functions static okay. 317 00:21:57,300 --> 00:22:02,320 Static means these properties belongs to a class and not to object. 318 00:22:02,530 --> 00:22:04,230 Okay thank you.