WEBVTT 00:00.580 --> 00:01.090 Hi everyone. 00:01.090 --> 00:02.500 Welcome back to this tutorial. 00:02.500 --> 00:07.900 In this tutorial we will explore the sorted function which we touched on the previous tutorial. 00:07.900 --> 00:13.690 So here we can explore a lot of different options that are available with the sorted method. 00:13.720 --> 00:19.060 For the purpose of this tutorial, what I'm going to do, I'm going to create a class called. 00:19.970 --> 00:20.750 Dreams. 00:21.860 --> 00:24.140 Comparator example. 00:24.650 --> 00:27.080 I'm going to make this class executable. 00:27.720 --> 00:29.230 Static void main. 00:29.330 --> 00:31.820 This makes a class to be executable. 00:32.690 --> 00:34.430 Report this in presentation mode. 00:36.460 --> 00:37.090 There you go. 00:37.240 --> 00:38.620 The faster bus. 00:40.220 --> 00:42.410 Go ahead and take a look at the student database. 00:45.040 --> 00:52.600 So student database has all these different students with the names Adam, Jenny, Emily, Dave, Sophia, 00:52.600 --> 00:53.570 and James. 00:53.590 --> 00:54.520 The use cases. 00:54.550 --> 01:00.700 We want to sort these result and then print the students in the order. 01:00.700 --> 01:02.620 In the alphabetical order, actually. 01:02.830 --> 01:04.000 How can we achieve that? 01:04.420 --> 01:06.820 Because each and every student is in different grade. 01:06.820 --> 01:10.240 But our use case doesn't matter which grade they are. 01:10.300 --> 01:17.560 The whole database class, the whole students needs to be printed in the sorted order by their name. 01:19.250 --> 01:27.640 So I'm going to create a method called public static list of children. 01:27.650 --> 01:31.730 So this method is going to return the student in sorted order. 01:32.090 --> 01:34.880 So I'm going to name this one by sort. 01:36.510 --> 01:37.560 You dance? 01:38.920 --> 01:39.460 By name. 01:39.610 --> 01:40.990 That's what it is going to do. 01:42.190 --> 01:45.400 Then for this input. 01:45.400 --> 01:45.840 This. 01:46.270 --> 01:46.810 There we go. 01:47.110 --> 01:48.280 The next step is. 01:49.030 --> 01:56.470 We're going to call the student database dot, get all students, and then call the stream method. 01:56.950 --> 02:00.790 And then what we are going to do is we are going to use the sorted. 02:00.820 --> 02:01.660 So sorted. 02:01.660 --> 02:04.450 If you take a look at it, there are two different variations. 02:04.450 --> 02:08.020 One is a sorted method which doesn't accept any input. 02:08.050 --> 02:12.520 The another one is a sorted method, then it accepts a comparator. 02:12.520 --> 02:13.270 So we are going. 02:13.300 --> 02:16.840 We already explored this sorted method in the previous tutorial. 02:16.840 --> 02:22.420 Now we are going to explore the sorted which takes a comparator as an input. 02:23.220 --> 02:24.180 The started. 02:24.360 --> 02:30.870 The first step is we are going to create an instance for comparator and then here we are calling the 02:30.870 --> 02:32.060 comparing method. 02:32.070 --> 02:38.430 So for the comparing method, if you take a look at it, the input that it that it accepts is a function. 02:38.790 --> 02:40.290 So that's what it accepts. 02:40.290 --> 02:44.580 So I'm going to sort the students by name as part of this method, right? 02:44.610 --> 02:45.900 What we can do is. 02:45.900 --> 02:47.640 Student Colon. 02:47.640 --> 02:48.300 Colon. 02:49.070 --> 02:50.810 And then pass the getName name. 02:51.990 --> 02:54.150 And then we are going to collect. 02:55.770 --> 02:56.910 In all do to list. 02:59.500 --> 02:59.950 Here you go. 03:01.820 --> 03:07.820 So either you can return this directly or you can assign this to a variable and then return it. 03:07.880 --> 03:13.120 So we did that, assigning this result to a variable and returning that as part of the previous tutorial. 03:13.130 --> 03:14.840 Now I'm going to return it directly. 03:16.870 --> 03:19.930 John, This is going to return the result. 03:21.040 --> 03:23.830 Meaning return the list of students in the sorted order. 03:23.860 --> 03:25.330 That's what it is going to do. 03:25.360 --> 03:27.370 I'm going to do a for each. 03:29.770 --> 03:33.940 And I'm going to use the syntax of. 03:34.740 --> 03:35.850 At the reference. 03:37.050 --> 03:41.460 But it is going to do I'm going to give a comment here because we are going to do different types of 03:41.460 --> 03:41.850 sorting. 03:41.850 --> 03:43.530 I want to differentiate the results from this. 03:47.870 --> 03:48.740 Students. 03:51.230 --> 03:53.570 Sorted by name. 03:54.530 --> 03:57.020 That's what is happening as part of this, right? 03:57.320 --> 04:02.620 So here what we did, we got the students and then we are calling the sorted method. 04:02.630 --> 04:07.250 But here we are using the sorted method which accepts a comparator. 04:07.250 --> 04:11.090 So you have to pass a property which you want the result to be sorted. 04:11.090 --> 04:13.940 So we wanted to sort the result by their name. 04:13.940 --> 04:20.420 That's the reason why we are passing this name as part of that function and then we are collecting the 04:20.420 --> 04:21.860 whole result as a. 04:22.770 --> 04:25.050 Let's go ahead and print this and check the result. 04:26.520 --> 04:29.600 So the result is we take a look at it. 04:29.610 --> 04:31.900 It is sorted in the alphabetical order. 04:31.920 --> 04:37.380 Adam, Dave, Emily, James, Jenny and Sophia. 04:37.680 --> 04:37.950 So. 04:39.220 --> 04:39.910 The name. 04:39.910 --> 04:43.670 We sorted the collection by the student name. 04:43.690 --> 04:47.620 The next thing is I want to sort the result by their GPA. 04:48.400 --> 04:49.150 Right. 04:49.150 --> 04:54.070 So I don't want to sort the name, sort the collection by their name. 04:54.070 --> 04:55.570 I want to sort it by. 04:59.790 --> 05:00.960 So how do we do? 05:00.960 --> 05:06.780 It is going to be the same result because it is going to still return the list of students. 05:06.780 --> 05:09.870 But in the place of here, we are going to use get. 05:11.320 --> 05:12.550 That's the only difference. 05:13.090 --> 05:13.630 I'm gonna. 05:15.030 --> 05:18.410 Is the same method, but I'm going to replace it here with. 05:19.280 --> 05:22.730 Chart shouldn't be because the flow is the same. 05:24.270 --> 05:25.940 Now copy this chart. 05:25.950 --> 05:27.900 Students by GPA. 05:27.990 --> 05:29.280 That's what I'm going to do. 05:29.310 --> 05:30.990 If I print the result. 05:31.020 --> 05:34.770 Let's print this and then compare between this list and this list. 05:38.090 --> 05:38.750 Here we go. 05:38.790 --> 05:40.130 They're still got printed. 05:43.580 --> 05:44.270 Where do we have it? 05:44.270 --> 05:46.460 So sort student sorted by GPA. 05:47.190 --> 05:47.980 We take a look at it. 05:47.990 --> 05:51.980 Sophia is the first person in the sorted result. 05:52.010 --> 05:59.090 If you take a look at here, Sophia is a last person person because here it is sorted the grade, meaning 05:59.090 --> 06:07.670 the GPA 11 sorry, the level is 3.5 for Sophia, which is the least and the greatest GPA is GPA is Emily. 06:08.180 --> 06:14.730 The GPA is 4.0, so it is sorted as per the GPA in ascending order. 06:14.750 --> 06:20.690 I want the result to be reversed because I don't want the least great person to be on the top. 06:20.690 --> 06:23.600 I want the highest grade person to be on the top. 06:23.600 --> 06:24.740 How do I do it? 06:26.180 --> 06:28.970 Now there is a handy method for that one too. 06:31.190 --> 06:32.120 Descending. 06:33.310 --> 06:36.250 So here you just have to call. 06:37.250 --> 06:37.520 So. 06:38.560 --> 06:40.980 But reversed the called reversed. 06:40.990 --> 06:45.520 Basically, it is going to reverse the result and return you the collection. 06:48.330 --> 06:50.190 Give descending order. 06:51.370 --> 06:52.960 The place of this. 06:52.960 --> 06:53.950 I'll be calling this. 06:55.220 --> 06:57.290 Okay, let's run this and then check. 06:59.610 --> 07:00.780 With the presentation mode. 07:00.780 --> 07:02.140 The result is really hard to see. 07:02.160 --> 07:05.310 I'm going to move away from the presentation mode and check the result. 07:06.000 --> 07:11.740 If we take a look at it here, we started by name here we started with GPA. 07:11.760 --> 07:14.130 With the GPA is ascending order here. 07:14.130 --> 07:17.910 If you take a look at it, the students sorted by descending order. 07:18.360 --> 07:19.230 Take a look at it. 07:19.260 --> 07:21.240 The top GPA is at the. 07:22.140 --> 07:27.150 A spokesman followed by that it goes down at least is 3.5. 07:27.690 --> 07:34.170 So these are the different ways you can sort the result if your use case is that you want to have the 07:34.170 --> 07:35.820 result in a. 07:37.010 --> 07:37.760 Started. 07:39.420 --> 07:39.750 With this. 07:39.750 --> 07:41.520 We came to the end of this tutorial. 07:41.550 --> 07:42.720 Thank you for watching.