1 00:00:01,120 --> 00:00:07,290 OK now let's look at the essentials demo specifically look at the asset statement itself and we will 2 00:00:07,290 --> 00:00:13,520 also look at the flaks the year flag under the Firaaq year for enabling officer issuance NBA for disabling 3 00:00:13,590 --> 00:00:14,220 officers. 4 00:00:14,240 --> 00:00:15,420 It's unreal. 5 00:00:15,440 --> 00:00:17,740 Specifically look at the year flag. 6 00:00:17,760 --> 00:00:25,080 The enabling flag at book Class unpackaged level under the flag only at a colossal event and we will 7 00:00:25,080 --> 00:00:26,980 also look at the year flag applied. 8 00:00:26,980 --> 00:00:27,700 But it's that. 9 00:00:27,730 --> 00:00:32,390 Without that without any restrictions at class or package of it. 10 00:00:32,550 --> 00:00:40,860 So here for this demo I created a new snapback package within exceptions called assertions and there 11 00:00:40,860 --> 00:00:50,560 are four classes which I've created a B C and D and A B and D going inside the assertions package on 12 00:00:50,700 --> 00:00:57,740 assertions also has a package quite Beaven on seed or July is placed inside be one. 13 00:00:58,230 --> 00:01:06,270 Now the main class is the Class 8 which means that it has a main method and within all four classes 14 00:01:06,390 --> 00:01:08,760 there is a best method. 15 00:01:09,300 --> 00:01:18,640 You can see it here in B B and C and within each element there has only one parameter in all the four 16 00:01:18,660 --> 00:01:19,780 classes on their stuff. 17 00:01:19,920 --> 00:01:21,330 It's a barometer. 18 00:01:21,340 --> 00:01:29,310 I am the first statement in all of the methods in each of the classes is an absurd statement. 19 00:01:29,310 --> 00:01:33,790 For example here in 8 or Java it is answered and it is simply checking. 20 00:01:33,800 --> 00:01:37,500 F I is greater than zero if it is greater than zero. 21 00:01:37,500 --> 00:01:38,530 We know that it is good. 22 00:01:38,570 --> 00:01:45,180 I can go with the next statement but if it is less than or equal to zero it means that our position 23 00:01:45,180 --> 00:01:52,410 is wrong and this message will be passed on to the as shown error which should be generated as a result 24 00:01:52,410 --> 00:01:53,390 of this failure. 25 00:01:53,550 --> 00:01:55,940 OK so in this case it is invalid. 26 00:01:55,950 --> 00:02:01,520 I in a test so similarly in beat or Jawa X is invalid. 27 00:02:01,530 --> 00:02:05,310 I n b dark dust and indeed are Java X's. 28 00:02:05,340 --> 00:02:11,840 In reality I indeed are dust and we have the similar statement and the class now. 29 00:02:12,780 --> 00:02:15,880 So Class C is inside the package be run here. 30 00:02:15,910 --> 00:02:20,290 OK just an ER doc and here in Class A. 31 00:02:20,400 --> 00:02:25,950 After the statement we are simply creating an instance of be an instance of C an instance of d n NBT 32 00:02:25,950 --> 00:02:29,770 are invoking the best matter that an argument minus one. 33 00:02:30,170 --> 00:02:35,940 I can beat or Java just has only the so its statement and seed Argile also just has only that sort of 34 00:02:35,990 --> 00:02:37,010 statement. 35 00:02:37,040 --> 00:02:42,990 Indeed our Java has no such statement but it is also creating an instance of B and is invoking that 36 00:02:43,200 --> 00:02:46,180 method that value minus one. 37 00:02:46,380 --> 00:02:48,430 So we will see why we are doing that. 38 00:02:48,480 --> 00:02:51,270 So let's just go ahead and run this. 39 00:02:51,270 --> 00:02:53,340 So by default it is disabled. 40 00:02:53,340 --> 00:02:55,010 All associates are disabled. 41 00:02:55,500 --> 00:03:00,500 So all these statements do not have any effect so far on it. 42 00:03:00,570 --> 00:03:07,710 So there is there is nothing happening just this Klaas's is running and this method is getting in work 43 00:03:08,160 --> 00:03:12,430 on all of these instances of getting created under US methods of getting in work. 44 00:03:12,540 --> 00:03:17,070 But those statements are disabled on Wednesday or not do you want to exit your date. 45 00:03:17,280 --> 00:03:25,800 So let's go ahead now and do the first test which is going to run us undrawn configurations. 46 00:03:25,800 --> 00:03:29,020 So we are going to enable it only for the Klasky. 47 00:03:29,210 --> 00:03:32,710 OK so let's go into arguments here. 48 00:03:33,390 --> 00:03:34,200 So this is for. 49 00:03:34,230 --> 00:03:35,290 This is for the Class A. 50 00:03:35,310 --> 00:03:40,790 OK we have done it right click on that and we have come here so we need to enable that only for class 51 00:03:40,930 --> 00:03:41,020 . 52 00:03:41,130 --> 00:03:43,020 So it would be hyphen. 53 00:03:43,620 --> 00:03:51,100 And this is the assertions doc a guess what we are enabling it for a. 54 00:03:52,230 --> 00:03:57,560 So when we run it we are passing minus one here and the method is getting invoked. 55 00:03:57,620 --> 00:04:02,740 And since it is less than or equal to zero it's printing the message invalid in a test. 56 00:04:02,800 --> 00:04:10,490 OK on your string assertion error not it's possible one here instead of minus one. 57 00:04:10,500 --> 00:04:13,310 Now we don't have such an error because this is true. 58 00:04:13,350 --> 00:04:16,220 Now this condition is true and we are going into the next statement. 59 00:04:16,650 --> 00:04:19,930 But assertions are unable and only for class A. 60 00:04:20,280 --> 00:04:25,990 So for that reason as assertions in any of these classes like B C and B are not executed. 61 00:04:26,280 --> 00:04:27,400 OK so now. 62 00:04:27,630 --> 00:04:29,520 So that's the first test. 63 00:04:29,570 --> 00:04:33,050 No let's just go ahead and label it for the package itself. 64 00:04:33,060 --> 00:04:33,540 Assertions. 65 00:04:33,550 --> 00:04:38,980 Package Berengar on as. 66 00:04:39,030 --> 00:04:41,480 So this is what we are doing it on class. 67 00:04:42,000 --> 00:04:43,950 Because that has the main matter. 68 00:04:43,980 --> 00:04:47,450 Once again let's pass the arguments the VM arguments here. 69 00:04:47,820 --> 00:04:51,750 Now here instead of a we are going to say since it's a package label. 70 00:04:51,770 --> 00:04:54,450 Is it docked three dots right. 71 00:04:54,480 --> 00:05:00,970 So that's for the package Acme applied here and it's run it. 72 00:05:01,540 --> 00:05:03,910 And now the associate set up Blyde. 73 00:05:04,000 --> 00:05:12,260 You can see that it's failing here for the test method in class B because we are passing a minus one 74 00:05:12,320 --> 00:05:17,570 understeering and associate error and the program is basically terminated in 1991 going to exit could 75 00:05:17,610 --> 00:05:18,980 any of these statements. 76 00:05:19,230 --> 00:05:27,330 So let's make this one SILVERDOCS SOTA statement and Glasby will work OK. 77 00:05:27,480 --> 00:05:31,040 But it is failing in class C. 78 00:05:31,080 --> 00:05:34,360 Ok that doesn't matter in class C because we are passing minus one. 79 00:05:34,650 --> 00:05:38,820 So the important thing to note here is the flag. 80 00:05:38,820 --> 00:05:42,230 The package level house specified it as assertions. 81 00:05:42,480 --> 00:05:49,810 But even though C is inside some baggage office notions that particular flag is still working. 82 00:05:49,950 --> 00:05:55,940 OK so the assertions have been unable for seed Argile also even doing it is part of a snapback edge 83 00:05:56,010 --> 00:05:56,190 . 84 00:05:56,230 --> 00:06:01,250 OK so the package level when we enable it at back is no wonder it would apply to both. 85 00:06:01,310 --> 00:06:06,320 All all the classes in that package and also any classes and sub packages. 86 00:06:06,340 --> 00:06:12,470 OK so that such package was not discussed earlier in the lesson so it would also apply for all packages 87 00:06:12,490 --> 00:06:12,700 . 88 00:06:12,890 --> 00:06:16,710 So let's also make this one now. 89 00:06:16,710 --> 00:06:17,960 Now everything is fine. 90 00:06:17,970 --> 00:06:22,210 It's only that in the class B there is an assertion outer and how. 91 00:06:22,290 --> 00:06:24,000 Because we are passing minus one. 92 00:06:24,300 --> 00:06:25,470 So that's the second best. 93 00:06:25,470 --> 00:06:29,270 Now let's just go ahead and disable it only for class D. 94 00:06:29,300 --> 00:06:30,840 So B stands for disabling. 95 00:06:30,840 --> 00:06:32,180 You can think that way. 96 00:06:32,220 --> 00:06:41,160 So it is going to aid our Java like going to run configurations here get into arguments and that's enabling 97 00:06:41,160 --> 00:06:42,090 . 98 00:06:42,090 --> 00:06:43,620 Now let's say discipling. 99 00:06:43,640 --> 00:06:44,630 It's Haifaa NBA 100 00:06:47,730 --> 00:06:49,510 needs to be D. 101 00:06:49,660 --> 00:06:51,640 K so let's apply. 102 00:06:51,700 --> 00:06:53,650 Sure on and on. 103 00:06:53,730 --> 00:06:59,190 As you can see now how does this it will be back within that dust method. 104 00:06:59,230 --> 00:07:03,420 Off D we are creating an instance off beat. 105 00:07:03,450 --> 00:07:06,260 So this statement is working fine because it's true. 106 00:07:06,510 --> 00:07:11,360 On the contrary comes here goes into best mentor and we are passing it minus one here. 107 00:07:11,540 --> 00:07:19,380 OK so since this is an instance of B so since we are passing minus one controller comes here on this 108 00:07:19,380 --> 00:07:25,450 phase underspending printing done invalid I indeed our best and you can see that back stack trace also 109 00:07:25,610 --> 00:07:26,250 says beat. 110 00:07:26,250 --> 00:07:32,790 Best indeed are best because it is invoking B and DS in don't invoke from a. 111 00:07:32,940 --> 00:07:35,120 And you can see the actress. 112 00:07:35,430 --> 00:07:37,550 So that's the third Test. 113 00:07:37,560 --> 00:07:42,130 Now let's just use only only that you like. 114 00:07:42,210 --> 00:07:45,700 OK so let's remove the package here. 115 00:07:45,720 --> 00:07:48,740 This will not make any difference in the output. 116 00:07:49,590 --> 00:07:53,190 So we are passing only EAF like to class A. 117 00:07:53,460 --> 00:07:57,170 So you are running a real running class A and we are passing on the flag. 118 00:07:57,210 --> 00:08:00,360 But we are also disabling only the class D. 119 00:08:00,780 --> 00:08:04,310 So we just go how to apply this. 120 00:08:04,620 --> 00:08:07,210 So once again it's the same output. 121 00:08:08,010 --> 00:08:13,900 So it means that the assertions are an amber since it's applied on a. 122 00:08:14,330 --> 00:08:15,350 It's a blight. 123 00:08:15,480 --> 00:08:19,110 It's an enabler for all classes that are being accessed from a. 124 00:08:19,170 --> 00:08:23,260 Which means except for B C and B. 125 00:08:23,280 --> 00:08:26,190 But in this case we have disabled it for beat. 126 00:08:26,520 --> 00:08:28,620 OK so it's disembody for me. 127 00:08:28,740 --> 00:08:30,610 So assertion is disabler here. 128 00:08:30,810 --> 00:08:36,980 But then since D is also invoking B cert it is also applied for B. 129 00:08:37,170 --> 00:08:45,600 So it is basically applied for a any unidentified object tree that is that gets created from Iran where 130 00:08:45,640 --> 00:08:50,160 it's ok including an object that is getting created somewhere inside. 131 00:08:50,280 --> 00:08:56,100 So that is we are in working creating an instance of B and within be an instance another instance of 132 00:08:56,100 --> 00:09:00,570 B is created and an assertion is also applied for that also. 133 00:09:00,660 --> 00:09:03,800 OK this one. 134 00:09:04,020 --> 00:09:05,490 So that's about it. 135 00:09:05,850 --> 00:09:12,930 That's how you were unable undecidable assertions and just all the discord is in the resources section 136 00:09:12,930 --> 00:09:12,950 . 137 00:09:12,960 --> 00:09:17,150 So you can go ahead and download and play with it and that's it. 138 00:09:17,190 --> 00:09:18,470 Thank you and happy coding