1 00:00:00,300 --> 00:00:02,050 Hi everyone in this story. 2 00:00:02,280 --> 00:00:07,260 I'm going to go ahead and touch about incrementing and decrementing in Java. 3 00:00:07,260 --> 00:00:07,810 OK. 4 00:00:07,980 --> 00:00:10,380 So first we need a Java project. 5 00:00:10,530 --> 00:00:14,380 So just click on this fine Neo and then click on Java project. 6 00:00:14,410 --> 00:00:22,520 OK so far the project name just taken here increment and decrement J. 7 00:00:22,820 --> 00:00:24,630 And click on finish. 8 00:00:24,800 --> 00:00:28,060 So as you can see here our project is now created. 9 00:00:28,190 --> 00:00:30,120 So we need a class for our project. 10 00:00:30,170 --> 00:00:36,000 So just click on this as RC for folder and then click on File new and click on class. 11 00:00:36,020 --> 00:00:36,890 OK. 12 00:00:36,890 --> 00:00:39,140 So for the class name just type in here increment 13 00:00:42,490 --> 00:00:44,670 OK for the package name. 14 00:00:44,780 --> 00:00:46,810 We need to reverse domain. 15 00:00:47,120 --> 00:00:51,040 So just type in here com that's your name. 16 00:00:51,440 --> 00:00:52,050 OK. 17 00:00:52,230 --> 00:00:53,590 That's your project name. 18 00:00:53,600 --> 00:00:54,350 OK. 19 00:00:54,560 --> 00:01:06,160 Increment and decrements OK and for the modifiers to publish and make sure that you take this checkbox 20 00:01:06,220 --> 00:01:09,170 he had public that it would mean method. 21 00:01:09,370 --> 00:01:13,470 This is going to be the starting point for running our Java code. 22 00:01:13,510 --> 00:01:14,270 OK. 23 00:01:14,290 --> 00:01:16,000 And then click on finish. 24 00:01:16,570 --> 00:01:19,380 So as you can see our class is now created. 25 00:01:19,510 --> 00:01:21,440 So just delete this comment here. 26 00:01:21,770 --> 00:01:27,970 And in order to make this edits have Area Vider just double click on the tap here increment decrement 27 00:01:28,030 --> 00:01:28,770 that go with. 28 00:01:28,810 --> 00:01:29,500 OK. 29 00:01:29,980 --> 00:01:33,680 So as you can see here our editor area is now wider. 30 00:01:33,730 --> 00:01:35,320 So now we can write our code. 31 00:01:35,350 --> 00:01:36,100 OK. 32 00:01:36,250 --> 00:01:39,340 So as you know I'm going to talk about incrementing 33 00:01:41,760 --> 00:01:44,110 and decrementing in Java 34 00:01:51,960 --> 00:02:02,350 so another common task required in programming is to add or subtract one value from an integer value. 35 00:02:02,420 --> 00:02:10,670 OK those expressions have special operators which are called increment and decrement operators. 36 00:02:10,700 --> 00:02:15,910 OK incrementing a valuable means adding one value to its value. 37 00:02:15,930 --> 00:02:16,460 OK. 38 00:02:16,620 --> 00:02:22,330 And decrement in a variable means subtracting one value from its value. 39 00:02:22,340 --> 00:02:27,950 OK the increment operator is this operator here and 40 00:02:30,660 --> 00:02:33,900 and the decrement operator is this operator here. 41 00:02:33,960 --> 00:02:40,430 OK these operators are placed immediately after or before a variable name. 42 00:02:40,620 --> 00:02:46,230 So let me actually show you some real examples in order to make this concept more clear for you. 43 00:02:46,230 --> 00:02:46,690 OK. 44 00:02:46,950 --> 00:02:54,000 So for example I want to create a variable the data type of my variable is int and the name of my variable 45 00:02:54,000 --> 00:02:54,260 is. 46 00:02:54,260 --> 00:02:57,070 For example my value OK. 47 00:02:57,510 --> 00:02:59,490 And then I assign a value to my value. 48 00:02:59,490 --> 00:03:01,120 But for example number seven. 49 00:03:01,290 --> 00:03:05,030 And then at the end of my statement I need to put in a semi-colon. 50 00:03:05,340 --> 00:03:08,060 So now I want to use these operators here. 51 00:03:08,070 --> 00:03:13,330 OK so for example I want to add one value to the value of this variable here. 52 00:03:13,440 --> 00:03:19,840 So as you know these operators are placed immediately after or before the variable name. 53 00:03:20,040 --> 00:03:24,100 OK so I just need to refer to the name of my variable. 54 00:03:24,450 --> 00:03:24,980 OK. 55 00:03:24,990 --> 00:03:27,080 Now I want to put this operator here. 56 00:03:27,120 --> 00:03:28,410 OK. 57 00:03:28,530 --> 00:03:30,840 Increment operator. 58 00:03:30,840 --> 00:03:32,010 So as you can see here. 59 00:03:32,010 --> 00:03:38,220 So now if I want to output the value of this variable to the console I just need to type in here system 60 00:03:39,270 --> 00:03:47,080 data out that print line and then inside Apprentice's I just need to refer to the name of my variable. 61 00:03:47,640 --> 00:03:50,830 And then at the end of my statement I need to put in a semicolon. 62 00:03:50,840 --> 00:03:51,320 OK. 63 00:03:51,540 --> 00:03:55,050 So now if I run my project let's see what happens. 64 00:03:55,050 --> 00:03:58,340 So as you can see this value is outputted to the console. 65 00:03:58,360 --> 00:03:58,910 OK. 66 00:03:59,160 --> 00:04:02,300 So this is the value of this variable here. 67 00:04:02,310 --> 00:04:02,900 OK. 68 00:04:03,120 --> 00:04:05,810 So now I want to use the increment operator here. 69 00:04:05,880 --> 00:04:06,330 OK. 70 00:04:06,360 --> 00:04:12,250 As you know these operators are placed immediately after or before the variable name. 71 00:04:12,330 --> 00:04:12,890 OK. 72 00:04:13,110 --> 00:04:17,000 So I just need to the first with the name of my variable my value. 73 00:04:17,180 --> 00:04:17,780 OK. 74 00:04:17,820 --> 00:04:20,750 And then I need to put in the increment operator here. 75 00:04:20,790 --> 00:04:21,370 OK. 76 00:04:21,570 --> 00:04:22,650 Plus plus. 77 00:04:22,650 --> 00:04:25,880 And then I need to put the semi-colon at the end of my statement. 78 00:04:25,900 --> 00:04:32,740 So now if I want to actually output the value of this variable to the console Let's see what happens. 79 00:04:32,760 --> 00:04:41,960 System that out that princeling and an insight Apprentice's I need to refer to the name of my valuable 80 00:04:42,050 --> 00:04:44,430 my value. 81 00:04:44,570 --> 00:04:46,910 I need to put in a semi-colon. 82 00:04:47,210 --> 00:04:50,730 So now if I run my project let's see what happens. 83 00:04:50,870 --> 00:04:53,780 As you can see the first value is 7. 84 00:04:53,900 --> 00:04:56,070 So this is the value of our value. 85 00:04:56,120 --> 00:05:01,670 And we decided to output this value to the concert in line 14. 86 00:05:01,760 --> 00:05:05,670 And as you can see this is the result of execution of this line of code here. 87 00:05:05,690 --> 00:05:06,200 OK. 88 00:05:06,350 --> 00:05:12,370 And in line 16 we decided to add one value to the value of our variable here. 89 00:05:12,380 --> 00:05:13,020 OK. 90 00:05:13,220 --> 00:05:19,690 And in line 17 we decided to output this value to the console. 91 00:05:19,760 --> 00:05:25,850 So as you can see this is the value that is output to the console after the increment of this value. 92 00:05:25,910 --> 00:05:26,720 OK. 93 00:05:27,350 --> 00:05:29,840 So now let me try show you another example. 94 00:05:29,850 --> 00:05:34,020 So now let me comment out this line of code here. 95 00:05:34,970 --> 00:05:41,170 So for example again I want to actually subtract one value from this variable here. 96 00:05:41,180 --> 00:05:41,870 OK. 97 00:05:42,360 --> 00:05:46,250 I want to subtract one value from the value of this variable here. 98 00:05:46,280 --> 00:05:46,880 OK. 99 00:05:47,120 --> 00:05:52,730 So again I just need to refer to the name of my variable and then I need to put the increment operator 100 00:05:52,740 --> 00:05:58,180 here minus minus and then at the end of my statement I need to put in a semi-colon. 101 00:05:58,190 --> 00:06:04,310 So now if I want to output the value of this value over to the console system that out that print learn 102 00:06:05,330 --> 00:06:10,820 and then inside the practices I just need to refer to the name of my valuable at the end of my statement. 103 00:06:10,830 --> 00:06:12,610 I need to put in a semi-colon. 104 00:06:12,620 --> 00:06:21,140 So now if I run my project as you can see the first value is 7 because this is the value that we assign 105 00:06:21,440 --> 00:06:29,330 to our variable when we created this variable and in line 14 we decided to output this value to the 106 00:06:29,330 --> 00:06:29,750 console. 107 00:06:29,750 --> 00:06:38,600 So this is the value of a variable and in line 19 we decided to actually subtract one value from the 108 00:06:38,600 --> 00:06:40,130 value of this variable here. 109 00:06:40,160 --> 00:06:40,710 Okay. 110 00:06:40,880 --> 00:06:46,410 And in line 29 we decided to output this value to the console. 111 00:06:46,490 --> 00:06:50,610 So this is the value of our value bet after the subtraction. 112 00:06:50,630 --> 00:06:51,490 OK. 113 00:06:52,160 --> 00:06:55,970 So let me actually show you another example. 114 00:06:55,970 --> 00:06:58,920 So let me ask you to comment out these lines of code here. 115 00:07:00,710 --> 00:07:01,720 OK. 116 00:07:02,440 --> 00:07:08,220 I want to declare another variable here is another value. 117 00:07:08,900 --> 00:07:12,460 And then I can assign a value to my value but for example number 20. 118 00:07:12,460 --> 00:07:13,020 Okay. 119 00:07:13,460 --> 00:07:20,440 And I want to output the value of this variable to the console system that out that princeling. 120 00:07:21,380 --> 00:07:26,470 And then inside Apprentice's I naturally first with the name of my valuable and other value. 121 00:07:26,750 --> 00:07:30,020 And then at the end of my statement I need to put in a semicolon. 122 00:07:30,020 --> 00:07:37,340 OK so now I want to actually run my project as you can see this value is out to the concert. 123 00:07:37,340 --> 00:07:37,710 OK. 124 00:07:37,760 --> 00:07:40,480 So for example I want to increment this value by 1. 125 00:07:40,600 --> 00:07:41,140 OK. 126 00:07:41,360 --> 00:07:46,140 So I just need to refer to the name of my body but in order to read it's value. 127 00:07:46,160 --> 00:07:46,850 OK. 128 00:07:47,080 --> 00:07:52,430 And now I want to increment the value of this variable by 1. 129 00:07:52,480 --> 00:07:52,980 OK. 130 00:07:53,000 --> 00:07:57,260 So I just need to put in here the increment operator plus plus. 131 00:07:57,500 --> 00:08:01,270 And then I need to put in a semi-colon at the end of my statement. 132 00:08:01,280 --> 00:08:08,600 So now if you run my project as you can see all I did I forgot to actually output the value of this 133 00:08:08,600 --> 00:08:10,390 variable to the concert. 134 00:08:10,490 --> 00:08:17,470 So system that out that creates land and then inside the. 135 00:08:17,530 --> 00:08:23,860 I just need to refer to the name of my variable and at the end of my statement I need to put in a semicolon. 136 00:08:23,860 --> 00:08:24,430 OK. 137 00:08:24,790 --> 00:08:30,800 So now if I run my project as you can see this is the value that is output to the console. 138 00:08:30,850 --> 00:08:36,140 And this is the value that we assigned to our variable when we actually created our variable. 139 00:08:36,220 --> 00:08:42,850 Ok as you can see and in line 23 of we decided to output this value to the consumer. 140 00:08:43,180 --> 00:08:51,130 So this is our value and in line 25 I decided to increment this value by 1. 141 00:08:51,340 --> 00:08:52,160 Okay. 142 00:08:52,180 --> 00:08:57,840 And in line 26 I decided to output this value to the console. 143 00:08:57,940 --> 00:08:58,390 Okay. 144 00:08:58,510 --> 00:08:59,650 Which is 21. 145 00:08:59,830 --> 00:09:00,400 Okay. 146 00:09:00,580 --> 00:09:04,840 So now that you actually comment out these lines of code here. 147 00:09:05,230 --> 00:09:06,090 Okay. 148 00:09:06,580 --> 00:09:10,460 And now I want to decrement the value of this variable by one. 149 00:09:10,480 --> 00:09:11,040 Okay. 150 00:09:11,230 --> 00:09:13,980 So again I need to refer to the name of my body. 151 00:09:14,220 --> 00:09:17,850 And then I need to put in the decrement operator here. 152 00:09:17,860 --> 00:09:18,470 Okay. 153 00:09:18,670 --> 00:09:22,230 And then at the end of my statement I need to put in a semi-colon. 154 00:09:22,460 --> 00:09:26,300 So now I want to output the value of this variable to the console. 155 00:09:26,530 --> 00:09:35,120 So now let me actually run my project as you can see it's going to only output this value to the concert. 156 00:09:35,120 --> 00:09:35,610 Okay. 157 00:09:35,800 --> 00:09:41,910 And this value here is the result of execution of this line of code here. 158 00:09:41,950 --> 00:09:42,810 Okay. 159 00:09:43,210 --> 00:09:51,180 And as you know in line 28 I actually subtracted the value of this valuable one. 160 00:09:51,640 --> 00:09:57,910 But as you can see it's not streaming the concert because I didn't write any code in order to output 161 00:09:58,000 --> 00:10:00,940 the value of this variable after the discrimination.