WEBVTT 00:00.200 --> 00:00.710 Hi everyone. 00:00.710 --> 00:02.030 Welcome back to this tutorial. 00:02.030 --> 00:07.730 In this tutorial we will code and explore the summing end and averaging end collector. 00:08.870 --> 00:13.520 The summing in collector is going to return the sum as a result. 00:14.350 --> 00:18.720 The averaging ENT collector is going to return the average as a result. 00:18.730 --> 00:19.540 Like summing. 00:19.540 --> 00:27.880 And this collector has the support for summing long summing double averaging long and averaging double. 00:27.910 --> 00:33.290 But in this tutorial we are going to focus only on the summing ent and averaging ent. 00:33.310 --> 00:34.720 Let's go ahead and code this one. 00:37.090 --> 00:38.710 To have the example here. 00:40.060 --> 00:43.330 I close all these previous examples? 00:44.400 --> 00:49.470 In here what I'm going to do, I'm going to create a class called Dreams. 00:50.820 --> 00:52.620 Some average example. 00:54.250 --> 00:58.060 Let's make this class executable by adding public static void main method. 00:59.080 --> 01:00.220 Kostas console. 01:01.880 --> 01:03.650 Let me put this in presentation mode. 01:04.370 --> 01:07.400 The first example is we are going to explore the sum. 01:08.710 --> 01:11.080 Public static int. 01:14.430 --> 01:20.730 Okay, now we are going to use a student database class and get all the students. 01:21.780 --> 01:27.480 The use case that we are going to code is that if you take a look at this student object, it has a 01:27.480 --> 01:28.940 property called notebooks. 01:28.950 --> 01:35.910 So our use case is to perform summation of all the notebooks this whole student collection has. 01:36.360 --> 01:37.620 That's a use case use case. 01:37.620 --> 01:38.580 We are going to code. 01:39.120 --> 01:43.170 So after the student, after we got all the students, we are going to call the stream method. 01:43.170 --> 01:47.970 In the stream method we are going to perform the collect operation in here. 01:47.970 --> 01:50.730 We are going to call summing int. 01:53.160 --> 01:55.230 That's a character we are going to make use of. 01:55.890 --> 02:02.490 Use of it in this scenario and what we are going to pass, we are going to pass within Colon. 02:02.490 --> 02:02.970 Colon. 02:02.970 --> 02:04.650 Let's import the student first. 02:08.190 --> 02:10.890 Some reason it is not giving me the recommendation. 02:11.040 --> 02:13.440 Let's put both the colons here. 02:13.440 --> 02:15.630 I believe it is going to give you the recommendation now. 02:15.660 --> 02:16.200 There you go. 02:16.200 --> 02:22.590 We have successfully imported the student and in here we are going to use the get notebooks, which 02:22.590 --> 02:26.370 is going to return the notebooks of each and every student. 02:26.370 --> 02:31.950 And the collect is going to accumulate all the values by performing the summation of each value that 02:31.950 --> 02:34.830 is being passed from the stream and return the result. 02:35.150 --> 02:37.280 So I'm going to add the return statement here. 02:37.290 --> 02:44.190 This return statement is going to return the whole summation of all the notebooks from all the students 02:44.550 --> 02:45.150 I'm going to print. 02:45.150 --> 02:50.400 The value here is going to be total number of notebooks. 02:51.700 --> 02:54.940 And then the method that it is going to call is sum. 02:55.090 --> 02:57.990 Let's run this example and check the result. 03:00.150 --> 03:00.640 There you go. 03:00.660 --> 03:03.120 It printed the result as 71. 03:03.300 --> 03:08.010 So this is all about the summing int let's explore the averaging int. 03:10.620 --> 03:13.170 So I'm going to name this one as average. 03:14.250 --> 03:19.860 And then instead of summing it, we are going to use averaging and there you go, averaging it. 03:19.860 --> 03:24.630 Like I mentioned in the presentation, it has the long version and double version too, but we are going 03:24.630 --> 03:26.520 to focus only on the averaging end. 03:27.690 --> 03:31.920 And if we take a look at the averaging end, it returns a type as double. 03:32.490 --> 03:35.430 So we are going to return the type as double. 03:40.260 --> 03:41.460 But s going to be. 03:42.520 --> 03:44.650 Average number of notebooks. 03:46.830 --> 03:51.840 Is a text, which I'm going to add, and then we are going to call the average method. 03:51.960 --> 03:56.760 So the average method performs a averaging and let's go ahead and run this one. 03:58.490 --> 04:03.920 So the average number of notebooks that each and every student has is 11.83. 04:04.340 --> 04:08.780 So this is all about summing and and averaging it collector. 04:10.650 --> 04:10.950 But this. 04:10.950 --> 04:12.400 We came to the end of this tutorial. 04:12.420 --> 04:13.530 Thank you for watching.