1 00:00:00,230 --> 00:00:05,110 Hi everyone in this theater early on I'm going to touch about logical operators. 2 00:00:05,130 --> 00:00:05,650 OK. 3 00:00:05,760 --> 00:00:08,250 So first we need to create a Java project. 4 00:00:08,340 --> 00:00:10,750 So just click on this file new. 5 00:00:11,250 --> 00:00:12,900 And then click on Java project. 6 00:00:12,900 --> 00:00:13,590 OK. 7 00:00:13,650 --> 00:00:16,110 So for the project name just type in here. 8 00:00:16,130 --> 00:00:19,530 Logical operators 9 00:00:22,450 --> 00:00:23,150 OK. 10 00:00:23,450 --> 00:00:25,210 And click on finish. 11 00:00:25,970 --> 00:00:29,500 So as you can see here our project is now created. 12 00:00:29,510 --> 00:00:35,540 So first we need a class for our project to just click on this as our See folder and then click on Phi 13 00:00:35,720 --> 00:00:37,770 new and then click on class. 14 00:00:38,210 --> 00:00:42,390 So for the class name just type in here logical operator 15 00:00:45,810 --> 00:00:49,930 Okay for the package name we need a reverse domain here. 16 00:00:50,050 --> 00:00:55,100 Just type in your column that your name dot project name ok. 17 00:00:55,810 --> 00:01:06,310 Logical operators are OK for the modifiers to publish and make sure that you check the check box here 18 00:01:06,570 --> 00:01:08,910 that says public static void main method. 19 00:01:08,920 --> 00:01:09,490 OK. 20 00:01:09,580 --> 00:01:11,390 And then click can finish. 21 00:01:11,590 --> 00:01:14,620 So as you can see here our project is now created. 22 00:01:14,620 --> 00:01:18,400 So first let me actually delete this comment here. 23 00:01:18,710 --> 00:01:24,100 And in order to make this a little area of there you just need to actually double click on this logical 24 00:01:24,100 --> 00:01:25,610 operator that job I have. 25 00:01:25,770 --> 00:01:26,290 OK. 26 00:01:26,350 --> 00:01:30,400 And here we can actually write our codes inside the main method. 27 00:01:30,700 --> 00:01:36,760 I'll talk more about the methods later in this course but for now I make sure that you write your code 28 00:01:36,850 --> 00:01:40,340 inside the curly braces of this main method. 29 00:01:40,360 --> 00:01:41,020 OK. 30 00:01:41,440 --> 00:01:43,750 So logical operators 31 00:01:47,690 --> 00:01:57,620 so expressions that result in boolean values such as comparison operators can be combined to form more 32 00:01:57,620 --> 00:01:59,040 complex expressions. 33 00:01:59,070 --> 00:02:05,250 OK this is handled through logical operators which are used for the logical combinations. 34 00:02:05,320 --> 00:02:08,000 OK so the first one is and. 35 00:02:08,390 --> 00:02:09,450 OK. 36 00:02:09,750 --> 00:02:17,460 Or the next one is Zaur and not. 37 00:02:17,750 --> 00:02:25,060 OK so now let me actually show you some real examples in order to make this concept more clear for you. 38 00:02:25,130 --> 00:02:28,500 OK so now you want to create a variable here. 39 00:02:28,530 --> 00:02:31,100 Ain't salary. 40 00:02:31,440 --> 00:02:31,880 OK. 41 00:02:31,950 --> 00:02:34,220 And then I assign a value to my variable. 42 00:02:34,230 --> 00:02:39,920 For example 2000 and I need to put a semicolon at the end of my variable here. 43 00:02:39,930 --> 00:02:40,510 OK. 44 00:02:40,590 --> 00:02:42,890 Now I want to create another variable here. 45 00:02:42,900 --> 00:02:43,470 OK. 46 00:02:43,590 --> 00:02:47,310 So the data type of my variable is boolean. 47 00:02:47,820 --> 00:02:48,380 OK. 48 00:02:48,690 --> 00:02:53,620 And the name of my variable is R for example is higher. 49 00:02:54,330 --> 00:02:54,900 OK. 50 00:02:55,050 --> 00:02:58,230 And then I want to assign a value to my variable here. 51 00:02:58,250 --> 00:03:06,230 OK so now I want to combine expressions together and then assign that value to my higher level here. 52 00:03:06,240 --> 00:03:13,560 OK so now I want to actually combine expressions together and then assign the value of those expressions 53 00:03:13,770 --> 00:03:15,280 to my highest value. 54 00:03:15,300 --> 00:03:17,370 OK so let's see how we can do that. 55 00:03:17,400 --> 00:03:17,920 OK. 56 00:03:18,150 --> 00:03:20,460 So first finish putting in parentheses. 57 00:03:20,460 --> 00:03:25,840 So now I want to actually referred to the name of my salary variable here. 58 00:03:26,040 --> 00:03:27,780 In order to read it's value. 59 00:03:27,780 --> 00:03:28,440 OK. 60 00:03:28,590 --> 00:03:30,390 So I just type in here salary. 61 00:03:30,550 --> 00:03:31,350 OK. 62 00:03:31,620 --> 00:03:36,540 So now I just put in a comparison operator here as you can see a greater than sign. 63 00:03:36,600 --> 00:03:37,420 OK. 64 00:03:37,860 --> 00:03:42,350 And then I put in a value here for example a thousand. 65 00:03:42,780 --> 00:03:46,100 So now I need to put in a semi-colon at the end of my statement. 66 00:03:46,150 --> 00:03:53,550 Ok here I am telling the computer if the value of this salary variable is greater than 1000 the value 67 00:03:53,550 --> 00:03:55,970 of the expression evaluates to TRUE. 68 00:03:56,060 --> 00:03:56,630 OK. 69 00:03:56,790 --> 00:04:06,720 But if the value of this salary variable is less than or equal to one 1000 the value of this expression 70 00:04:06,930 --> 00:04:11,310 as you can see here the value of this expression evaluates to false. 71 00:04:11,310 --> 00:04:11,970 OK. 72 00:04:12,150 --> 00:04:17,250 So let's actually output the value of these variables for the console and let's see what's going on 73 00:04:17,250 --> 00:04:17,750 here. 74 00:04:17,850 --> 00:04:22,980 System that out that princeling. 75 00:04:23,610 --> 00:04:29,370 And then inside the practices I just referred to the name of one variable in order to read its value. 76 00:04:29,370 --> 00:04:29,710 OK. 77 00:04:29,820 --> 00:04:33,290 And then at the end of my statement I need to put in a semi-colon OK. 78 00:04:33,420 --> 00:04:40,050 Again I want to output the value of this is higher variable to the console akey the value of this boolean 79 00:04:40,050 --> 00:04:43,150 variable that I created in line 17. 80 00:04:43,170 --> 00:04:43,790 Okay. 81 00:04:44,070 --> 00:04:52,890 So I just need to type in here system that out that line and then inside Apprentice's I just need to 82 00:04:52,890 --> 00:04:58,830 refer to the name of my variable and that at the end of my statement I need to put in a semicolon OK. 83 00:04:59,040 --> 00:05:06,860 So now if I run my project as you can see it's going to output these values to the consulate. 84 00:05:07,320 --> 00:05:10,740 So as you can see here the first one is disvalue. 85 00:05:10,740 --> 00:05:15,020 Here is the result of execution of this line of code here. 86 00:05:15,060 --> 00:05:15,780 OK. 87 00:05:15,930 --> 00:05:17,160 In line 15. 88 00:05:17,280 --> 00:05:26,610 So this value is the value of my salary variable that I created in line 14 and I decided to output the 89 00:05:26,610 --> 00:05:30,300 value of this variable to the console in line 50. 90 00:05:30,330 --> 00:05:31,640 OK. 91 00:05:32,310 --> 00:05:34,240 So orders does matter here. 92 00:05:34,250 --> 00:05:38,520 OK this is very important and in inline 17 as you can see here. 93 00:05:38,550 --> 00:05:42,150 I created another variable here with the boolean data type. 94 00:05:42,150 --> 00:05:42,850 OK. 95 00:05:42,990 --> 00:05:47,950 And this is the name of my variable is hired and I assigned a value to my variable here. 96 00:05:47,970 --> 00:05:48,420 OK. 97 00:05:48,540 --> 00:05:55,820 I created an expression here and I specified that salary must be greater than 1000. 98 00:05:55,830 --> 00:05:56,340 OK. 99 00:05:56,400 --> 00:06:03,740 If the salary is greater than 1000 the value of this expression evaluates to true and that true value 100 00:06:04,020 --> 00:06:06,040 will be assigned to my highest value. 101 00:06:06,040 --> 00:06:13,260 Well if the value of the side of the variable is less than or equal to one thousandth the value of this 102 00:06:13,260 --> 00:06:19,800 for expression evaluates to false and that false value will be assigned to my it is higher value. 103 00:06:20,190 --> 00:06:26,260 So in line 18 I decided to output the value of this is higher is the variable to the console. 104 00:06:26,490 --> 00:06:32,110 So as you can see here the value that I assigned to my salary evaluable is 2000. 105 00:06:32,130 --> 00:06:32,920 OK. 106 00:06:32,930 --> 00:06:40,050 And in this expression I specified that the value of the salary variable must be greater than 1000 in 107 00:06:40,050 --> 00:06:42,540 order to evaluate its expression true true. 108 00:06:42,600 --> 00:06:43,080 OK. 109 00:06:43,170 --> 00:06:45,650 So let's actually see what's in the console. 110 00:06:45,810 --> 00:06:49,540 As you can see the true value is now out to the console. 111 00:06:49,740 --> 00:06:55,650 So the value of this expression is evaluated to true because the value of the solidly value bet as you 112 00:06:55,650 --> 00:06:58,390 can see 2000 is greater than 1000. 113 00:06:58,470 --> 00:07:00,860 OK this expression evaluates to true. 114 00:07:01,230 --> 00:07:09,660 And that true value will be assigned to might is higher variable and in line 18 I decided to output 115 00:07:09,750 --> 00:07:13,010 the value of this is variable to the console. 116 00:07:13,160 --> 00:07:13,980 As you can see here. 117 00:07:14,010 --> 00:07:14,470 Okay. 118 00:07:14,540 --> 00:07:19,010 So now I want to actually combine two expressions together. 119 00:07:19,010 --> 00:07:19,550 Okay. 120 00:07:19,820 --> 00:07:23,930 So first let me actually comment out these lines of code here. 121 00:07:24,350 --> 00:07:25,120 Okay. 122 00:07:25,430 --> 00:07:32,300 And here I want to actually create another variable in for example the name of my variable with the 123 00:07:32,300 --> 00:07:33,260 money. 124 00:07:33,780 --> 00:07:35,130 Okay. 125 00:07:35,300 --> 00:07:39,880 And I want to assign a value to my variable for example 100. 126 00:07:39,980 --> 00:07:40,450 Okay. 127 00:07:40,550 --> 00:07:43,590 And then at the end of my statement I need to put in a semi-colon. 128 00:07:43,590 --> 00:07:44,100 Okay. 129 00:07:44,450 --> 00:07:50,450 So here I want to output the value of this valuable to the concert to make sure that it works. 130 00:07:50,450 --> 00:07:53,370 System that out that princeling. 131 00:07:53,780 --> 00:07:57,480 And then inside Apprentice's I just need to refer to the name of my variable. 132 00:07:57,590 --> 00:08:02,770 So let me actually put a text here in order to make this value more readable. 133 00:08:02,780 --> 00:08:11,170 This is the value of the money roudy of it. 134 00:08:11,270 --> 00:08:12,010 OK. 135 00:08:12,370 --> 00:08:17,200 And here after the double codes I need to put an A-plus operator here. 136 00:08:17,420 --> 00:08:17,710 OK. 137 00:08:17,710 --> 00:08:22,330 Because I want to concatenate this text here with my variable name. 138 00:08:22,360 --> 00:08:23,020 OK. 139 00:08:23,170 --> 00:08:31,430 So I just need to type in here money and at the end of my statement I need to put in a semi-colon OK. 140 00:08:31,810 --> 00:08:39,880 So if I run my project now as you can see there is no space between this valuable vote here and the 141 00:08:39,880 --> 00:08:41,090 value of my value. 142 00:08:41,210 --> 00:08:49,060 And so here I need to actually create a space here after the variable vort and if I run my project again 143 00:08:49,120 --> 00:08:51,540 this space is now created here. 144 00:08:52,090 --> 00:08:57,960 So this is the value of the money variable 100 as you can see. 145 00:08:58,230 --> 00:08:58,810 OK. 146 00:08:58,990 --> 00:09:01,210 Now let me actually create another variable. 147 00:09:01,210 --> 00:09:03,850 So the data type of My value is boolean. 148 00:09:04,110 --> 00:09:04,630 OK. 149 00:09:04,720 --> 00:09:08,980 And now you want to actually give a name to my variable for example. 150 00:09:09,300 --> 00:09:13,100 Chan by car. 151 00:09:13,570 --> 00:09:14,360 OK. 152 00:09:14,830 --> 00:09:17,090 And then you want to assign a value to my value. 153 00:09:17,110 --> 00:09:18,640 For example false. 154 00:09:19,300 --> 00:09:23,340 And then at the end of my statement I need to put in a semicolon OK. 155 00:09:23,470 --> 00:09:32,770 So now I want to output the value of this invaluable to the consulate system that out that print line 156 00:09:33,500 --> 00:09:37,830 and then inside the apprentice's I just need to refer to the name of my variable. 157 00:09:37,830 --> 00:09:39,890 Can by car. 158 00:09:40,990 --> 00:09:41,490 OK. 159 00:09:41,740 --> 00:09:44,890 And then at the end of my statement I need to put in a semicolon. 160 00:09:44,890 --> 00:09:45,290 OK. 161 00:09:45,430 --> 00:09:45,730 OK. 162 00:09:45,730 --> 00:09:47,780 Inside it up and codes just type in here. 163 00:09:47,820 --> 00:10:00,410 This is the value of the can by card value.