1 00:00:00,450 --> 00:00:07,980 Everyone in this Tauriel I'm going to talk about primitive data types and then I'm going to give you 2 00:00:08,220 --> 00:00:14,050 actually some examples about using primitive data types in your Java programs. 3 00:00:14,070 --> 00:00:14,900 OK. 4 00:00:15,180 --> 00:00:18,120 So first we need to create our Java project. 5 00:00:18,330 --> 00:00:23,780 So as you know we just need to click on this find new and then click on Java project. 6 00:00:23,840 --> 00:00:24,450 OK. 7 00:00:24,660 --> 00:00:33,070 And for the project name just type in here primitive primitive data types. 8 00:00:33,900 --> 00:00:34,890 OK. 9 00:00:35,410 --> 00:00:42,040 And for the project's location I choose the default location as you can see here and then click on finish. 10 00:00:42,190 --> 00:00:42,760 OK. 11 00:00:43,000 --> 00:00:45,950 So as you can see here my project is now created. 12 00:00:46,000 --> 00:00:46,740 OK. 13 00:00:46,810 --> 00:00:49,380 Now we need a class for our project. 14 00:00:49,570 --> 00:00:56,590 So just pro-cyclical this is RC folder and the new and then click on class all you can click on this 15 00:00:57,040 --> 00:01:04,630 is our folder or click on these primitive data types project and then click on File Nijo and then click 16 00:01:04,630 --> 00:01:05,290 on class. 17 00:01:05,290 --> 00:01:05,960 OK. 18 00:01:06,220 --> 00:01:14,460 So for the class name just type in here primitive data type data type. 19 00:01:14,580 --> 00:01:15,400 OK. 20 00:01:15,760 --> 00:01:20,440 And for the patch page as I said before you need to do. 21 00:01:20,510 --> 00:01:27,790 Reverse domain name so just type in here or reverse domain name com that Tesa. 22 00:01:28,440 --> 00:01:31,920 And at the end you need to put in the project name. 23 00:01:32,010 --> 00:01:32,860 OK. 24 00:01:33,220 --> 00:01:39,850 Primitive data types are checked. 25 00:01:40,000 --> 00:01:42,790 And for the modifiers choose public. 26 00:01:43,110 --> 00:01:47,980 And here check this checkbox that says public is that it would make me fat. 27 00:01:48,010 --> 00:01:48,830 OK. 28 00:01:49,050 --> 00:01:52,590 This is going to be our starting point for running our coats. 29 00:01:52,600 --> 00:01:54,540 OK this is our main method. 30 00:01:54,750 --> 00:01:56,440 And then click on finish. 31 00:01:57,030 --> 00:02:01,570 So as you can see here our class is created and we are ready to go. 32 00:02:01,590 --> 00:02:02,140 OK. 33 00:02:02,310 --> 00:02:05,990 So first let me actually make this a little area of idea. 34 00:02:06,060 --> 00:02:06,620 OK. 35 00:02:06,750 --> 00:02:09,370 So doubleclick on these primitive data type. 36 00:02:09,370 --> 00:02:10,510 The Java tab. 37 00:02:10,730 --> 00:02:11,350 OK. 38 00:02:11,700 --> 00:02:16,330 So now I'm going to give you some descriptions about primitive data types. 39 00:02:16,350 --> 00:02:19,640 So first I create a multi-line comment here. 40 00:02:19,970 --> 00:02:20,560 OK. 41 00:02:20,850 --> 00:02:26,330 And now I paste subtext here and then I'll let you know what's going on here. 42 00:02:26,340 --> 00:02:27,260 OK. 43 00:02:27,630 --> 00:02:34,740 So primitive data types are actually built in parts of the language which makes them easier to create 44 00:02:34,830 --> 00:02:40,260 and use the first primitive data type that I'm going to explain about is. 45 00:02:40,280 --> 00:02:45,580 But OK so why is an 8 bit integer as you can see here. 46 00:02:45,900 --> 00:02:53,120 And the minimal value that it can hold is this number minus one hundred and twenty eight. 47 00:02:53,430 --> 00:02:58,500 And the maximum value that it can hold is one hundred and twenty seven. 48 00:02:58,600 --> 00:03:03,670 OK the next data type is short as you can see here. 49 00:03:03,960 --> 00:03:06,610 This is 16 bits integer. 50 00:03:06,710 --> 00:03:07,800 OK. 51 00:03:08,190 --> 00:03:15,480 And the minimum value that these data type can hold is this value and the maximum value that this data 52 00:03:15,480 --> 00:03:16,400 type can hold. 53 00:03:16,440 --> 00:03:17,860 Is this OK. 54 00:03:17,940 --> 00:03:22,550 In other words it can hold a value between these two numbers. 55 00:03:22,620 --> 00:03:26,750 The next one is int which you are already familiar with. 56 00:03:26,820 --> 00:03:34,080 This is a first of two bits integer and the minimum value that this state can hold is this value and 57 00:03:34,670 --> 00:03:37,260 the maximum value that this data type can hold. 58 00:03:37,260 --> 00:03:38,420 Is this OK. 59 00:03:38,680 --> 00:03:40,920 It can hold a value between these two numbers. 60 00:03:40,940 --> 00:03:41,490 OK. 61 00:03:42,950 --> 00:03:52,420 And the next one is Lohn this is a 64 bit integer and the minimum value that this data type can hold 62 00:03:52,420 --> 00:03:56,530 is disvalue earn the maximum value that this data type can hold. 63 00:03:56,530 --> 00:03:57,240 Is this ready. 64 00:03:57,250 --> 00:04:00,480 OK if can hold a value between these two numbers. 65 00:04:00,690 --> 00:04:03,870 OK the next primitive data type is float. 66 00:04:03,940 --> 00:04:09,120 As you can see here a lot of data type is a single precision. 67 00:04:09,190 --> 00:04:16,600 First it will be floating point O.J. and the minimum value that this data type can hold is this value 68 00:04:16,690 --> 00:04:17,960 as you can see here. 69 00:04:18,210 --> 00:04:18,740 OK. 70 00:04:18,940 --> 00:04:21,660 And this here means xponent. 71 00:04:21,700 --> 00:04:24,600 OK xponent my minus 45. 72 00:04:24,790 --> 00:04:25,420 OK. 73 00:04:25,660 --> 00:04:31,050 And the maximum value that these days that I can hold is this number OK. 74 00:04:31,140 --> 00:04:40,510 And again this here means exponent and it says exponent 38 OK so floating point numbers are numbers 75 00:04:40,720 --> 00:04:42,600 with a decimal point or J. 76 00:04:42,820 --> 00:04:50,800 And the next primitive data type is double as you can see here double data type is a double precision 77 00:04:51,010 --> 00:04:57,280 64 bits floating point OK and the minimum value that this data type can hold. 78 00:04:57,280 --> 00:05:02,560 Is this number and then the maximum value that the state can hold. 79 00:05:02,560 --> 00:05:04,360 Is this number OK. 80 00:05:04,480 --> 00:05:07,030 And this here means exponent. 81 00:05:07,120 --> 00:05:08,000 OK. 82 00:05:08,350 --> 00:05:12,010 And double data type can be used for more precise numbers. 83 00:05:12,010 --> 00:05:12,520 OK. 84 00:05:12,670 --> 00:05:20,790 So double data type is like flautas data type Ojay and the next one is card or Chad. 85 00:05:20,920 --> 00:05:28,780 I prefer to call it card card data type is a single 16 bit Unicode character and it is used for individual 86 00:05:28,780 --> 00:05:32,680 characters such as letters numbers punctuation and other symbols. 87 00:05:32,710 --> 00:05:33,350 OK. 88 00:05:33,550 --> 00:05:36,700 The next one is Boolean which you are already familiar with. 89 00:05:36,880 --> 00:05:40,150 If can hold either true or false. 90 00:05:40,310 --> 00:05:48,720 OK and we've got constants and other type of variables if the value should never change during our programs 91 00:05:48,720 --> 00:05:57,990 run time Jake you can use a type of variable called a constant A-J and to declare a constant use the 92 00:05:57,990 --> 00:06:05,880 final keyboard before the variable declaration and include an initial value for that variable. 93 00:06:06,060 --> 00:06:06,740 OK. 94 00:06:08,480 --> 00:06:11,860 So now I'm going to give you some real examples to make. 95 00:06:11,860 --> 00:06:13,860 These are primitive data types. 96 00:06:13,970 --> 00:06:15,130 More clear for you. 97 00:06:15,230 --> 00:06:16,170 OK. 98 00:06:16,250 --> 00:06:20,960 Now as you can see here the first primitive data type is byte. 99 00:06:20,990 --> 00:06:21,620 OK. 100 00:06:21,620 --> 00:06:26,060 So first I wanted to type in here byte as are data type. 101 00:06:26,310 --> 00:06:26,890 OK. 102 00:06:27,050 --> 00:06:32,340 This is our data type and we need to give it a name number value. 103 00:06:32,450 --> 00:06:34,560 OK this is our area name. 104 00:06:35,010 --> 00:06:38,710 And as you can see I assigned the value 20 to my variable. 105 00:06:38,990 --> 00:06:42,880 So now I'm going to output this value to the console. 106 00:06:43,010 --> 00:06:43,620 OK. 107 00:06:43,730 --> 00:06:48,250 System that out that print land and then inside Apprentice's. 108 00:06:48,290 --> 00:06:54,770 I just need to put in the name of the variable OK number value and then at the end I just need to put 109 00:06:54,770 --> 00:06:55,970 in the semicolon. 110 00:06:56,240 --> 00:06:59,810 Now as you can see the data type of my variable is fine. 111 00:06:59,930 --> 00:07:07,220 So now I want to assign the value 200 to my body but is now showing an error type mismatch cannot convert 112 00:07:07,460 --> 00:07:08,950 from int to whites. 113 00:07:08,960 --> 00:07:09,490 OK. 114 00:07:09,710 --> 00:07:15,710 So as I said earlier in this tutorial the minimum value that this can hold is minus one hundred twenty 115 00:07:15,710 --> 00:07:18,700 eight and the maximum is 127. 116 00:07:18,790 --> 00:07:19,360 OK. 117 00:07:19,550 --> 00:07:24,980 So despite the I cannot hold a value greater than 127. 118 00:07:25,050 --> 00:07:27,970 OK so I changed this one you to 20. 119 00:07:28,220 --> 00:07:34,820 And if I ran my project now as you can see it now outputs the value of this variable to the console. 120 00:07:34,880 --> 00:07:35,550 OK. 121 00:07:38,380 --> 00:07:41,210 The next primitive data type is short. 122 00:07:41,240 --> 00:07:44,080 Ok so first we need to type in the data type. 123 00:07:44,080 --> 00:07:50,160 Short as you can see here and I'm going to actually give this variable a name will you. 124 00:07:50,380 --> 00:07:51,070 OK. 125 00:07:51,250 --> 00:07:54,530 And then I assign a value to this variable. 126 00:07:54,850 --> 00:07:55,590 OK. 127 00:07:55,840 --> 00:07:57,250 As you can see here. 128 00:07:57,670 --> 00:08:04,510 So now I want to actually output the value of this variable to the console system that out that printin 129 00:08:04,960 --> 00:08:09,480 and then inside Apprentice's I just need to put in the name of the variable. 130 00:08:09,490 --> 00:08:10,560 Ok are you. 131 00:08:10,750 --> 00:08:11,360 OK. 132 00:08:11,530 --> 00:08:14,860 And then at the end I need to put in the semi-colon. 133 00:08:15,160 --> 00:08:21,030 And as you can see here first I want to actually comment out this line of code here. 134 00:08:21,070 --> 00:08:28,190 And if I run my project now it's going to outputs the value of these Baali invaluable to the Carson. 135 00:08:28,210 --> 00:08:32,220 Now I want to assign a very large value to this variable. 136 00:08:32,410 --> 00:08:35,330 So as you can see here it's now showing you an error. 137 00:08:35,350 --> 00:08:35,920 OK. 138 00:08:36,160 --> 00:08:39,230 So it says cannot convert from Int. 139 00:08:39,260 --> 00:08:39,930 OK. 140 00:08:40,180 --> 00:08:46,080 As I said earlier a distorted data I can only hold a value between these two numbers. 141 00:08:46,090 --> 00:08:46,710 OK. 142 00:08:46,990 --> 00:08:49,600 So it cannot hold these very large value. 143 00:08:49,600 --> 00:08:50,250 OK. 144 00:08:50,650 --> 00:08:52,980 So I need to change this value. 145 00:08:53,260 --> 00:09:01,120 The next primitive data type is it which you are already familiar with the name of the variable is score. 146 00:09:01,280 --> 00:09:07,060 And I can actually assign a value to these very OK. 147 00:09:07,180 --> 00:09:10,140 And then at the end I just need to put in a semi-colon. 148 00:09:10,270 --> 00:09:15,280 And here I want to actually output the value of this variable to the console. 149 00:09:15,310 --> 00:09:19,820 So a system that out that print line and then inside the parenthesis. 150 00:09:19,960 --> 00:09:22,180 I just need to refer to the name of the variable. 151 00:09:22,180 --> 00:09:22,940 OK. 152 00:09:23,470 --> 00:09:27,500 And now let me actually comment out this line of code here. 153 00:09:27,730 --> 00:09:32,770 And then if I run my project now as you can see it's going to output the value of this variable to the 154 00:09:32,770 --> 00:09:33,230 console. 155 00:09:33,250 --> 00:09:34,110 OK. 156 00:09:34,540 --> 00:09:39,770 So here I want to actually again assign a very large value to like to my variable. 157 00:09:40,000 --> 00:09:43,500 So as you can see it says this value is out of range. 158 00:09:43,510 --> 00:09:44,390 OK. 159 00:09:44,530 --> 00:09:51,860 So as I said earlier at the state it can only hold a value between these two numbers. 160 00:09:51,880 --> 00:09:52,590 OK. 161 00:09:52,690 --> 00:09:59,380 We cannot actually assign a value greater than the maximum value that this data type can hold. 162 00:09:59,410 --> 00:10:00,070 OK.