WEBVTT 00:00.620 --> 00:01.190 Hi everyone. 00:01.190 --> 00:02.510 Welcome back to this tutorial. 00:02.510 --> 00:07.460 In this tutorial we will code and learn about the max by and min by collector. 00:09.360 --> 00:17.250 The max by and min by collector takes in a comparator as an input and returns the optional as an output. 00:18.960 --> 00:26.520 The maximal collector is always used in conjunction with a comparator and returns the max element based 00:26.520 --> 00:29.280 on the property passed to the comparator. 00:30.330 --> 00:34.630 The Minbar collector is again used in conjunction with the comparator. 00:34.650 --> 00:40.410 It returns the smallest element based on the property passed to the comparator. 00:40.440 --> 00:42.270 Let's go ahead and code this one. 00:42.990 --> 00:44.880 Have the IntelliJ open in here. 00:44.880 --> 00:50.310 What I'm going to do is I'm going to create a new class called Dreams. 00:51.330 --> 00:51.990 Min by. 00:52.860 --> 00:54.900 Max by example. 00:56.590 --> 01:01.300 And let's make this class executable by adding public static void main. 01:04.170 --> 01:04.950 The first. 01:05.860 --> 01:10.510 Function that we are going to explore is a min by basically the min by collector. 01:11.140 --> 01:14.190 So I'm going to have public static. 01:14.200 --> 01:20.410 It's going to be a optional, as I mentioned in the presentation, the min by and max by always return 01:20.410 --> 01:21.460 the optional. 01:21.680 --> 01:26.470 So in here it is going to return optional of type student and then. 01:28.140 --> 01:28.770 Going to be. 01:28.770 --> 01:31.200 I'm going to name this function as min by. 01:31.950 --> 01:33.150 Let's import this. 01:35.360 --> 01:36.290 And put this one to. 01:37.700 --> 01:42.890 Now the first call is going to be the input, which is the student database dot. 01:44.130 --> 01:49.920 Get all students and this is going to return you, all the students, and we are going to start the 01:49.920 --> 01:50.670 stream. 01:50.910 --> 01:56.640 So the stream method is going to give us the stream of students and we are going to perform the collect 01:56.640 --> 01:57.480 operation. 01:57.480 --> 02:01.680 So in the collect operation we are going to use the min by. 02:04.700 --> 02:11.450 Which is part of the collectors because the method name here is also min by the IntelliJ is getting 02:11.450 --> 02:11.930 confused. 02:11.930 --> 02:14.990 I'm going to name this one as min by underscore. 02:15.890 --> 02:16.700 Example. 02:18.400 --> 02:18.790 Here. 02:18.790 --> 02:21.610 If you take a look at it, If I do a static import. 02:22.990 --> 02:24.150 Having some issues there. 02:24.160 --> 02:26.710 What I'm going to do, I'm going to type in min by. 02:29.290 --> 02:30.760 That's just this. 02:31.150 --> 02:31.490 There you go. 02:31.510 --> 02:34.000 You got the static method import option available. 02:34.000 --> 02:34.900 Click on that. 02:34.900 --> 02:37.870 So it is going to be Collectors dot min by. 02:38.720 --> 02:42.520 And in here it is going to take in an input as a comparator, right? 02:42.530 --> 02:47.300 So comparator dot comparing there is an comparing option in here. 02:47.300 --> 02:50.060 We are going to pass the student GPA. 02:51.260 --> 02:58.190 Basically the idea is to get the student who has the least GPA in this whole list collection. 02:59.060 --> 03:00.110 We're going to return this. 03:01.810 --> 03:08.650 So if we go to the students, the least student is 3.5 and the name of the student is Sophia. 03:10.490 --> 03:12.620 Let's run this example. 03:13.720 --> 03:17.710 So then I'm going to call Min by example method. 03:18.280 --> 03:21.370 This is going to give you the result as a. 03:23.030 --> 03:24.830 Current, which is going to be Sofia. 03:25.700 --> 03:26.730 There you go. 03:26.780 --> 03:32.780 Sofia is a student who has the least grade out of the student collection that we have here, which is 03:32.780 --> 03:34.220 the list of students. 03:34.310 --> 03:37.310 Now let's explore the max by example. 03:37.310 --> 03:45.440 I'm going to just copy this and then put it here and rename this method as Max by example and the place 03:45.440 --> 03:46.130 of Min by. 03:46.130 --> 03:48.110 I'm going to use Max by. 03:48.230 --> 03:48.590 There you go. 03:48.590 --> 03:50.500 It gave me the recommendation already. 03:50.510 --> 03:51.710 I'm going to select that. 03:52.650 --> 04:01.950 And then if I run this example and pass the max by example as an input to this method, basically this 04:01.950 --> 04:02.970 is going to. 04:04.380 --> 04:08.390 Return the student who has the highest grade, which is Emily. 04:08.400 --> 04:10.680 Let's go to the student collection and verify that. 04:10.920 --> 04:12.000 Go to the student collection. 04:12.030 --> 04:15.810 Emily is the one which has the highest grade of all the students. 04:16.580 --> 04:24.900 So this is all about performing the min by and max by collector operation using the collect method. 04:24.920 --> 04:27.030 With this we came to the end of this tutorial. 04:27.050 --> 04:28.280 Thank you for watching.