1 00:00:00,350 --> 00:00:01,000 OK. 2 00:00:01,350 --> 00:00:08,790 But if both of these boolean expressions are true or if both of these boolean expressions are far less 3 00:00:09,200 --> 00:00:13,100 this logical operator produces a false value. 4 00:00:13,110 --> 00:00:13,730 OK. 5 00:00:13,860 --> 00:00:19,110 So for example if I want to actually change this value to something else for example. 6 00:00:19,350 --> 00:00:22,880 Now that is less than or equal to 69. 7 00:00:23,400 --> 00:00:31,950 And if I change this value for example to 78 as you can see here now it's can actually again output 8 00:00:32,250 --> 00:00:34,050 the value true to the console. 9 00:00:34,050 --> 00:00:40,350 So let's actually run our project as you can see it's not actually the value tool is now output to the 10 00:00:40,350 --> 00:00:40,930 console. 11 00:00:41,100 --> 00:00:46,950 Because this expression as you can see here this expression evaluates to TRUE. 12 00:00:47,010 --> 00:00:47,700 OK. 13 00:00:48,000 --> 00:00:52,320 As you can see the value of the non-fun valuable is less than sixty nine. 14 00:00:52,480 --> 00:01:00,510 OK so the value of the number one variable is 59 and 59 is less than 69. 15 00:01:00,540 --> 00:01:02,580 So this expression evaluates to TRUE. 16 00:01:02,730 --> 00:01:05,640 OK on this expression here. 17 00:01:05,880 --> 00:01:11,790 Evaluate to false OK the value of the number one variable is not greater than 78. 18 00:01:11,850 --> 00:01:12,830 OK. 19 00:01:13,210 --> 00:01:18,360 59 is not greater than 78 59 is less than 78. 20 00:01:18,420 --> 00:01:26,010 So this expression here evaluates to false as a result the value of the entire expression evaluates 21 00:01:26,010 --> 00:01:26,580 to true. 22 00:01:26,580 --> 00:01:33,180 Now we're not talking about another type of logical operator the not logical operator OK not logical 23 00:01:33,210 --> 00:01:34,800 operator so. 24 00:01:35,160 --> 00:01:40,410 So in order to use the not logical operator in our Java code views design in our code. 25 00:01:40,410 --> 00:01:40,890 OK. 26 00:01:41,130 --> 00:01:44,900 Just place and shift key plus the number one key on your keyboard. 27 00:01:44,910 --> 00:01:45,530 OK. 28 00:01:45,840 --> 00:01:46,860 As you can see. 29 00:01:47,040 --> 00:01:53,880 So in order to use the not logical operator in your Java code we use this symbol this logical operator 30 00:01:54,150 --> 00:02:01,920 reverses the value of the boolean expression in the same way that a minus sign reverses the positive 31 00:02:01,980 --> 00:02:03,990 or negative sign on a number. 32 00:02:04,060 --> 00:02:07,020 OK so now let me show you some real examples. 33 00:02:07,020 --> 00:02:07,720 OK. 34 00:02:07,740 --> 00:02:14,700 So the data type of my variable is int and the name of my variable is first number. 35 00:02:15,260 --> 00:02:15,670 OK. 36 00:02:15,690 --> 00:02:18,000 And then I want to assign a value to my variable. 37 00:02:18,000 --> 00:02:19,450 For example 25. 38 00:02:19,460 --> 00:02:26,070 So now I want to create another boolean variable so the data type of my variable is boolean and the 39 00:02:26,070 --> 00:02:27,570 name of multivariable is. 40 00:02:27,570 --> 00:02:32,020 For example can get our job. 41 00:02:32,660 --> 00:02:33,190 OK. 42 00:02:33,210 --> 00:02:36,820 And then I assign a value to my valuable for example follows. 43 00:02:37,320 --> 00:02:40,790 And then at the end of my statement I need to put in a semi-colon OK. 44 00:02:41,100 --> 00:02:45,790 So now I want to change the value of these boolean value here. 45 00:02:45,810 --> 00:02:51,900 So I just need to refer to the name of my variable and get a job and then I want to assign a value to 46 00:02:51,900 --> 00:02:52,770 my variable. 47 00:02:52,920 --> 00:02:55,960 So here I want to actually use that expression. 48 00:02:56,100 --> 00:02:56,870 OK. 49 00:02:57,060 --> 00:03:01,380 I just need to put in prentices and that inside Apprentice's I can with the expression. 50 00:03:01,380 --> 00:03:01,920 OK. 51 00:03:02,190 --> 00:03:03,910 So. 52 00:03:04,170 --> 00:03:10,280 So I want to actually refer to the name of my first number variable in order to read its value. 53 00:03:10,320 --> 00:03:14,270 So as you can see here I use the capital T here. 54 00:03:14,280 --> 00:03:15,010 This is wrong. 55 00:03:15,090 --> 00:03:18,520 Ok I need to use the lowercase letter. 56 00:03:18,750 --> 00:03:22,790 OK because this letter is part of my first word. 57 00:03:22,800 --> 00:03:23,410 OK. 58 00:03:23,640 --> 00:03:29,670 So here I need to refer to the name of my variable in order to read its value first number. 59 00:03:29,670 --> 00:03:35,730 Now I want to tell the computer that first number must be less than 50. 60 00:03:36,060 --> 00:03:36,360 OK. 61 00:03:36,360 --> 00:03:40,040 And then at the end of my statement I need to put in a semi-colon OK. 62 00:03:40,050 --> 00:03:46,990 So now I ventured out with the value of this variable to the concert system that out that princeling 63 00:03:48,420 --> 00:03:53,390 and and inside the apprentice's I need to refer to the name of my variable I can get a job. 64 00:03:53,400 --> 00:03:54,150 OK. 65 00:03:54,360 --> 00:03:57,960 And then at the end of my statement I need to put in a semi-colon. 66 00:03:58,260 --> 00:04:03,090 So if I run my project now as you can see it outputs this value to the console. 67 00:04:03,090 --> 00:04:03,670 True. 68 00:04:03,900 --> 00:04:07,460 OK this value is the value of this can get a job value of it. 69 00:04:07,500 --> 00:04:10,530 OK so this expression here evaluates to TRUE. 70 00:04:10,530 --> 00:04:11,210 Why. 71 00:04:11,250 --> 00:04:17,450 Because the value of the first number value is 25 and 25 is less than 50. 72 00:04:17,610 --> 00:04:20,480 OK so this expression evaluates to true. 73 00:04:20,490 --> 00:04:23,670 So now I want to use the not operator here. 74 00:04:23,670 --> 00:04:29,990 So in order to use the not operator in our code we need to put the not operator before the boolean expression. 75 00:04:30,030 --> 00:04:32,910 So as you can see this is our boolean expression. 76 00:04:32,910 --> 00:04:35,550 Now I want to put another operator here. 77 00:04:35,550 --> 00:04:41,610 So now let me actually run my project as you can see this value is now false. 78 00:04:41,640 --> 00:04:45,830 OK the value of false is now out with her to the console. 79 00:04:45,870 --> 00:04:55,890 So the not operator reverses the value of a boolean expression in the same way that the minus sign reverses 80 00:04:56,070 --> 00:04:58,850 the positive or negative sign on a number. 81 00:04:59,000 --> 00:05:04,360 OK as you can see not operator reverses the value of this expression. 82 00:05:04,360 --> 00:05:07,950 So for example as you can see first number is less than 50. 83 00:05:08,010 --> 00:05:12,730 So this expression evaluates to TRUE OK but this not operator here. 84 00:05:12,840 --> 00:05:16,000 Rivera says that the true value to false value. 85 00:05:16,020 --> 00:05:16,860 OK. 86 00:05:17,040 --> 00:05:21,240 And that's why you see the first value is output to the console. 87 00:05:21,240 --> 00:05:26,910 So for example if I now change this value here to 20 as you can see. 88 00:05:26,970 --> 00:05:30,240 So now let me actually run my project and see what happens. 89 00:05:30,270 --> 00:05:33,590 The value of that is output to the console is true. 90 00:05:33,600 --> 00:05:34,910 So what's going on here. 91 00:05:34,920 --> 00:05:42,360 So let me explain to you once again as you can see this expression here evaluates to false the value 92 00:05:42,360 --> 00:05:45,270 of the first number variable is 25. 93 00:05:45,290 --> 00:05:48,850 OK so 25 is not less than 20. 94 00:05:48,900 --> 00:05:58,140 So the value of this entire expression evaluates to false but this not operator here that reverses the 95 00:05:58,140 --> 00:06:00,240 value of a boolean expression. 96 00:06:00,450 --> 00:06:05,970 Ok this not operator reverses that false value to true value. 97 00:06:05,970 --> 00:06:06,840 True Value. 98 00:06:06,850 --> 00:06:11,040 So that's why we see the true value here in the console. 99 00:06:11,100 --> 00:06:12,200 OK. 100 00:06:12,240 --> 00:06:13,800 So this is very important. 101 00:06:13,800 --> 00:06:18,010 So now if I for example change this number to 50. 102 00:06:18,150 --> 00:06:19,860 Now let me run my project. 103 00:06:19,860 --> 00:06:23,040 So as you can see the value falls out with at the console. 104 00:06:23,090 --> 00:06:26,470 OK first number is less than 30. 105 00:06:26,550 --> 00:06:33,500 So this expression evaluates to TRUE okay and does not operate operator reverses that true value to 106 00:06:33,510 --> 00:06:34,440 false value. 107 00:06:34,440 --> 00:06:38,290 So now let me actually change this number two for example 10. 108 00:06:38,310 --> 00:06:42,450 So as you can see here the value true is outputted to the console. 109 00:06:42,530 --> 00:06:43,050 Okay. 110 00:06:43,110 --> 00:06:45,840 So this expression here evaluates to false. 111 00:06:45,840 --> 00:06:46,450 Okay. 112 00:06:46,710 --> 00:06:51,170 The value of this first number variable 25 is not less than 10. 113 00:06:51,330 --> 00:06:51,930 Okay. 114 00:06:52,110 --> 00:07:00,330 So this expression evaluates to false and this operator reverses that false value to true value. 115 00:07:00,330 --> 00:07:01,210 Okay. 116 00:07:01,530 --> 00:07:06,790 So that's why we see these are true value in the console Okay. 117 00:07:07,050 --> 00:07:10,490 So I think that's enough for this theater. 118 00:07:10,830 --> 00:07:14,610 And if you have any question please post the discussion in the course. 119 00:07:14,640 --> 00:07:20,430 So thank you very much for watching this tutorial and I'll see you in the next tutorial.