WEBVTT 00:00.680 --> 00:01.220 Hi everyone. 00:01.220 --> 00:02.660 Welcome back to this tutorial. 00:02.660 --> 00:08.960 In this tutorial we will code and learn about find first and find any function which is part of the 00:08.960 --> 00:09.890 streams API. 00:11.140 --> 00:15.350 This is basically used to find an element in the stream. 00:15.370 --> 00:21.580 The only difference between this one and all match any match and none match is that all. 00:21.580 --> 00:21.990 Match. 00:22.000 --> 00:22.620 None match. 00:22.630 --> 00:25.000 And any match returns a boolean. 00:25.030 --> 00:28.540 This one will return the element itself. 00:30.170 --> 00:34.580 Both the functions returns the result of the type as optional. 00:34.610 --> 00:41.150 So in the previous one for the non-match all match and any match the return type was always boolean. 00:42.000 --> 00:43.500 The Findfirst returns. 00:43.500 --> 00:46.620 The first element it finds as per the condition. 00:48.400 --> 00:49.210 Find any returns. 00:49.210 --> 00:52.630 The first encountered element in the string. 00:53.610 --> 00:55.900 You might be wondering what is the difference, right? 00:55.920 --> 00:58.320 Both the functions are going to return. 00:58.320 --> 01:03.060 The first element it is going to find as per the condition in the stream. 01:03.060 --> 01:03.600 Right. 01:03.600 --> 01:05.970 So the answer for that one is that. 01:06.800 --> 01:13.760 When you run the same stream in the parallel context, the Findfirst is going to return the first element 01:13.760 --> 01:18.240 it encountered in one of the stream which is running in parallel. 01:18.260 --> 01:21.020 So that's where the key difference is going to be. 01:21.050 --> 01:22.010 Don't worry about it. 01:22.010 --> 01:26.820 For now, I'm going to cover parallel streams as a separate section. 01:26.840 --> 01:30.020 I'll cover this during that particular section. 01:31.620 --> 01:33.090 Let's go ahead and code this one. 01:37.000 --> 01:37.460 There you go. 01:37.480 --> 01:43.760 What I'm going to do is for the purpose of this tutorial, I'm going to create a class called Dreams. 01:44.200 --> 01:47.350 Find any first example. 01:50.000 --> 01:51.830 Want to make this class executable. 01:53.810 --> 01:54.440 And. 01:56.110 --> 01:57.310 In presentation mode. 02:00.020 --> 02:05.780 The first function that we are going to explore is find any public. 02:06.430 --> 02:06.910 Tadic. 02:08.920 --> 02:11.710 So we know it is going to return optional. 02:12.040 --> 02:17.530 And the type that we are going to explore is student code that. 02:18.610 --> 02:21.100 For the optional in here. 02:21.100 --> 02:24.600 We are going to do find any student. 02:27.490 --> 02:30.190 That's going to be student database dot. 02:31.270 --> 02:31.780 It all. 02:31.780 --> 02:33.510 Students dot stream. 02:33.790 --> 02:34.380 Okay. 02:34.390 --> 02:39.090 The next step is we are going to use a filter and then use the find any. 02:40.220 --> 02:40.880 Filter. 02:41.480 --> 02:44.030 So we are going to find any student. 02:45.120 --> 02:48.240 Any student who has a GPA as. 02:49.270 --> 02:52.210 Greater than or equal to 3.9. 02:53.580 --> 02:53.940 Okay. 02:54.060 --> 02:55.350 And then I'm gonna. 02:56.530 --> 02:57.010 Ball. 02:57.010 --> 02:58.390 So this is a filter. 02:58.610 --> 03:02.050 The next thing is I'm going to call the find any. 03:03.130 --> 03:03.480 There you go. 03:03.490 --> 03:05.410 There are there is a fine first and find any. 03:05.410 --> 03:09.700 We are going to explore find any as part of this tutorial. 03:13.760 --> 03:15.290 So we have the implementation ready. 03:15.290 --> 03:17.570 Let's call this method and get the result. 03:18.320 --> 03:19.370 The optional. 03:20.940 --> 03:21.780 Shouldn't. 03:25.140 --> 03:25.900 And then. 03:26.970 --> 03:28.700 To make student optional. 03:28.970 --> 03:29.900 Find any? 03:33.080 --> 03:33.620 People to. 03:34.890 --> 03:36.240 Find a new student. 03:36.550 --> 03:40.230 So this is going to give you the optional student if. 03:41.300 --> 03:42.230 Find any. 03:45.020 --> 03:46.550 God is present. 03:46.850 --> 03:48.530 Then I'm going to call the. 03:50.690 --> 03:52.600 Get method and get the result. 03:52.610 --> 03:54.020 Found the student. 03:55.700 --> 03:58.010 Call the get get method Plus. 03:58.980 --> 04:03.460 Didn't know that, Right. 04:04.100 --> 04:05.450 The next thing is. 04:07.720 --> 04:13.570 If the student is not found, then we have to go to the else loop and print it as. 04:14.810 --> 04:17.300 Student not found. 04:19.450 --> 04:20.950 Now, let's go ahead and explore this. 04:20.950 --> 04:23.790 Basically, let's go ahead and run this and check the result. 04:26.230 --> 04:26.770 Run it. 04:27.100 --> 04:29.200 It gave me the student as Emily. 04:29.290 --> 04:32.590 Let's go ahead and check the get all students method. 04:32.590 --> 04:33.910 So you have. 04:35.130 --> 04:37.530 A student, which is going to be 3.6. 04:37.530 --> 04:41.430 So we know Stream is going to pass the elements one by one. 04:41.760 --> 04:46.380 So the first student that it might have passed is 3.6 and the second student is. 04:48.020 --> 04:48.700 Jenny. 04:48.710 --> 04:50.960 So will be in this order, right? 04:51.830 --> 04:52.580 Adam. 04:53.760 --> 04:54.810 Next one is Jenny. 04:55.530 --> 04:57.030 And next one is Emily. 04:58.450 --> 05:06.400 As soon as it found a student with this filter criteria, it returned that student and it did not execute 05:06.400 --> 05:10.480 any of the students below this because it found the student. 05:10.720 --> 05:13.030 That's the purpose of find any. 05:13.060 --> 05:20.620 It just iterates and then it goes through this condition until it finds this find this student basically 05:20.620 --> 05:22.750 until it matches this filter criteria. 05:22.750 --> 05:29.200 And then as soon as one student matches this filter criteria, it returned that student as an output. 05:31.470 --> 05:33.120 It did not execute. 05:33.120 --> 05:38.490 It did not iterate through all the elements in this particular students. 05:39.400 --> 05:39.760 Dream. 05:41.210 --> 05:41.660 All right. 05:41.660 --> 05:44.530 So this is all about find any students. 05:44.540 --> 05:46.280 Let's go ahead and explore the. 05:47.340 --> 05:49.620 Find first student. 05:49.650 --> 05:54.810 So we are going to explore the find first function, which is part of the Streams API. 05:54.870 --> 05:58.080 The place of this we're going to give find first. 06:01.200 --> 06:01.620 Here. 06:02.610 --> 06:05.130 I'll copy this whole thing and then put it here. 06:07.060 --> 06:08.620 Going to be fined. 06:12.000 --> 06:12.930 It's going to be fine. 06:12.960 --> 06:14.130 First student. 06:18.990 --> 06:25.590 Rigor defined for student is present and then you're going to print the result. 06:25.590 --> 06:28.050 If the student is not found, we are going to print. 06:28.080 --> 06:28.950 Student Not found. 06:29.960 --> 06:31.610 I'm going to run this example. 06:35.670 --> 06:39.870 So if you take a look at it, both the output printed the same value. 06:40.760 --> 06:46.550 As I mentioned in the presentation, the difference is going to be when we run the stream in parallel 06:46.550 --> 06:47.000 mode. 06:47.150 --> 06:48.860 Let's not worry about it for now. 06:48.860 --> 06:53.780 I will cover that as a separate section in the future tutorials. 06:55.180 --> 07:01.270 Let's go ahead and explore a scenario where we're going to get a student not found basically if iterates 07:01.270 --> 07:05.590 through all the elements in the stream, but none of the student matches this condition. 07:05.600 --> 07:07.270 I'm going to give 4.1. 07:07.540 --> 07:11.110 I'm I've changed that value to the find first student. 07:11.140 --> 07:13.030 Let's go ahead and run this and then check. 07:13.030 --> 07:18.940 So we are going to get student not found for the find first student method call. 07:21.310 --> 07:21.940 There we go. 07:22.220 --> 07:28.340 So it gave the value as a student not found because none of the student matched this filter criteria. 07:28.370 --> 07:30.920 That's the reason why we did not get the result. 07:31.040 --> 07:33.800 Let me revert it back to its original state. 07:35.090 --> 07:35.800 There you go. 07:35.840 --> 07:39.950 So this is all about find first and find any. 07:39.980 --> 07:45.680 The only difference is that only difference between the all match, any match and none match and find 07:45.680 --> 07:49.880 any and find first is that it returns the actual element itself. 07:49.880 --> 07:54.590 But the all match none match and any match returns the boolean. 07:54.590 --> 07:59.030 If that particular element is present in the stream. 07:59.120 --> 08:01.340 With this, we came to the end of this tutorial. 08:01.340 --> 08:02.570 Thank you for watching.