1 00:00:04,440 --> 00:00:08,030 So first for example I want to create somebody. 2 00:00:08,070 --> 00:00:08,640 OK. 3 00:00:08,820 --> 00:00:16,890 In the name of my variable with B X and then I assign a value to my valuable and at the end of my statement 4 00:00:16,980 --> 00:00:18,600 I need to put in a semicolon. 5 00:00:18,690 --> 00:00:19,320 OK. 6 00:00:19,440 --> 00:00:25,020 So first I want to output the value of this variable to the console to make sure that it's working. 7 00:00:25,380 --> 00:00:32,790 Print line and inside the prentices I just need to refer to the name of my variable and at the end of 8 00:00:32,790 --> 00:00:37,530 my statement I need to put in the same code on OK so if I write on my project as you can see it's going 9 00:00:37,530 --> 00:00:39,760 to output this value to the console. 10 00:00:39,780 --> 00:00:42,320 This is the value of the x variable here. 11 00:00:42,360 --> 00:00:42,990 OK. 12 00:00:43,140 --> 00:00:48,490 Now I want to actually create another variable here ain't Y. 13 00:00:49,260 --> 00:00:55,560 And I want to assign a value to my value but for example x plus plus and at the end of my statement 14 00:00:55,920 --> 00:00:57,960 I need to put in a semicolon. 15 00:00:57,960 --> 00:01:07,810 So here as you can see so here I can see why it is given the value of the x variable before it is incremented. 16 00:01:07,970 --> 00:01:08,760 OK. 17 00:01:09,360 --> 00:01:18,300 Because I used this postfix operator here the value of these x variable is going to be assigned to the 18 00:01:18,910 --> 00:01:23,990 rivalry at Bell and then the value of this variable will be incremented. 19 00:01:24,020 --> 00:01:30,680 OK so if I actually output the value of this very variable to the console system that out that print 20 00:01:30,680 --> 00:01:35,470 land and the inside Apprentice's I just need to refer to the name of one variable. 21 00:01:35,490 --> 00:01:45,310 So first when I actually put in some text here this is the value of my voice value. 22 00:01:45,360 --> 00:01:46,120 OK. 23 00:01:49,400 --> 00:01:50,180 OK. 24 00:01:50,630 --> 00:01:53,720 And then I need to refer to the name of my variable. 25 00:01:53,750 --> 00:01:54,170 Why. 26 00:01:54,230 --> 00:01:54,770 OK. 27 00:01:54,950 --> 00:01:57,980 And at the end of my statement I need to put in a semi-colon. 28 00:01:58,430 --> 00:02:04,800 So if I run my project now as you can see it's going to actually output this value to the console. 29 00:02:05,030 --> 00:02:07,990 This is the value of my very valuable 42. 30 00:02:08,100 --> 00:02:08,600 OK. 31 00:02:08,720 --> 00:02:15,890 Even though I use these plus plus operator on my variable name it didn't actually assign the incremented 32 00:02:15,890 --> 00:02:22,300 value to my wife value it because I use this postfix operator on my variable name first. 33 00:02:22,520 --> 00:02:29,390 It actually assigned the value of this valuable to my view variable and then it incremented the value 34 00:02:29,390 --> 00:02:31,280 of this x variable by 1. 35 00:02:31,370 --> 00:02:32,300 As you can see here. 36 00:02:32,380 --> 00:02:33,030 OK. 37 00:02:33,230 --> 00:02:42,110 If I actually want to output the value of this variable to the console system that out that printed 38 00:02:42,120 --> 00:02:42,400 on 39 00:02:47,100 --> 00:02:50,900 and then inside the prentices I just need to refer to the name of my variable. 40 00:02:50,990 --> 00:02:52,870 So I just put in some text here. 41 00:02:52,940 --> 00:02:58,100 This is the value of my 42 00:03:01,520 --> 00:03:08,460 X Y Z and after incrementing it's value OK. 43 00:03:12,960 --> 00:03:14,730 It's value by what. 44 00:03:15,380 --> 00:03:16,480 OK. 45 00:03:17,970 --> 00:03:24,580 So here I use the plus operator in order to concatenate this text with my variable name. 46 00:03:24,660 --> 00:03:32,000 So I just put in the variable name here and at the end of my statement I need to put in a semi-colon. 47 00:03:32,190 --> 00:03:32,780 OK. 48 00:03:33,090 --> 00:03:39,790 So now if you run my project as you can see it's going to output this value here to the console. 49 00:03:39,830 --> 00:03:47,150 OK this is the value of my x variable after incrementing its value by 1 OK for free. 50 00:03:47,190 --> 00:03:49,130 This is the value of my x variable. 51 00:03:49,130 --> 00:03:57,480 After incrementing its value by 1 in this line of code here OK I use the postfix operator on my variable 52 00:03:57,480 --> 00:03:58,100 name here. 53 00:03:58,200 --> 00:03:59,060 OK. 54 00:03:59,460 --> 00:04:05,070 And because I used the post this operator on my variable name for it it's going to actually assign the 55 00:04:05,070 --> 00:04:12,690 value of this variable which is 42 to my view variable here and then it's gonna actually increment the 56 00:04:12,690 --> 00:04:21,210 value of this variable which is 42 by 1 and the value of this variable will be 40 free. 57 00:04:21,360 --> 00:04:29,160 So in this line of code in line 71 I decided to output the value of this valuable to the console in 58 00:04:29,160 --> 00:04:34,310 order to show you that the value of the x value but is now incremented. 59 00:04:34,350 --> 00:04:35,150 OK. 60 00:04:35,700 --> 00:04:45,620 So now if I actually use the prefix operator on my variable name here minus minus x. 61 00:04:45,900 --> 00:04:50,720 Ok so now let's actually run our project and see what happens. 62 00:04:51,570 --> 00:04:56,020 So as you can see here the value of my very valuable is 41. 63 00:04:56,120 --> 00:04:56,630 Okay. 64 00:04:56,640 --> 00:05:00,780 And the value of my x variable is 41. 65 00:05:01,020 --> 00:05:01,870 As you can see here. 66 00:05:01,940 --> 00:05:02,770 OK. 67 00:05:02,970 --> 00:05:10,980 So because I use the prefix operator here first is going to actually decrement the value of this x variable 68 00:05:10,980 --> 00:05:18,730 here which is 42 by 1 and then it's gonna assign that value to my view variable here. 69 00:05:18,750 --> 00:05:25,150 So as you can see in the console the value of my right the value of my value variable is 41. 70 00:05:25,250 --> 00:05:26,040 OK. 71 00:05:26,100 --> 00:05:32,290 So in line 71 as you can see here the value of my x variable is 41. 72 00:05:32,430 --> 00:05:35,800 OK because of this line of code here as you can see. 73 00:05:36,160 --> 00:05:36,520 OK. 74 00:05:36,540 --> 00:05:40,170 So that's it for actually incrementing and decrementing in Java. 75 00:05:40,180 --> 00:05:40,760 OK. 76 00:05:40,980 --> 00:05:48,210 So if you have any questions about these concepts that are actually taught to you in this lecture please 77 00:05:48,210 --> 00:05:53,130 post a discussion in the course and ask your questions and then I'll answer all of your questions. 78 00:05:53,130 --> 00:05:53,550 OK. 79 00:05:53,550 --> 00:05:59,480 So thank you very much for watching this tutorial and I'll see you in the next tutorial.