WEBVTT 00:00.620 --> 00:01.130 Hi everyone. 00:01.130 --> 00:02.360 Welcome back to this tutorial. 00:02.360 --> 00:08.210 In this tutorial, we will test our knowledge by building the same use case of printing the name and 00:08.210 --> 00:09.650 the list of activities. 00:09.650 --> 00:15.800 By combining the predicate and consumer functional interface we have been coding so far. 00:15.800 --> 00:17.630 Let's go ahead and code this one. 00:18.410 --> 00:24.080 The first step is I'm going to create a class called predicate and consumer example. 00:29.760 --> 00:30.510 Sounds good. 00:31.290 --> 00:32.430 The next step is. 00:33.680 --> 00:38.840 I'm going to make this class executable by adding the public static void main method. 00:40.050 --> 00:41.600 Now what I'm going to do. 00:41.610 --> 00:44.410 Until now, we have been creating static methods, right? 00:44.430 --> 00:47.820 In this example, we are going to create an instance method. 00:47.850 --> 00:49.350 Why are we changing now? 00:49.380 --> 00:55.800 The main reason why I would like to do it via instance method is to highlight that lambda behaves the 00:55.800 --> 01:00.270 same irrespective of an instance instance method or a static method. 01:01.710 --> 01:04.710 Gonna name this one as public void. 01:07.050 --> 01:09.750 Print name and. 01:11.350 --> 01:12.310 Activities. 01:13.430 --> 01:14.930 This is what I would like to call. 01:15.920 --> 01:18.020 Okay, now we have our method ready. 01:18.050 --> 01:21.620 The next step is we'll create our consumer. 01:23.960 --> 01:24.530 Consumer. 01:29.130 --> 01:32.940 And this consumer is basically going to iterate. 01:35.480 --> 01:36.950 I import the consumer. 01:37.950 --> 01:40.060 Have the consumer instance ready. 01:40.080 --> 01:41.880 Now let's go ahead and implement it. 01:42.090 --> 01:43.950 This is going to accept the student. 01:43.950 --> 01:47.670 And what it is going to do is it is going to. 01:48.820 --> 01:51.070 Perform the filtering operation. 01:51.070 --> 01:55.450 Basically, we are going to now create the instance of predicate. 01:55.600 --> 02:02.020 So the predicate instance is going to be for the grade level and the level. 02:03.220 --> 02:04.380 I'm going to create. 02:05.920 --> 02:06.460 Indicate. 02:08.580 --> 02:09.180 Student. 02:11.990 --> 02:12.830 For this. 02:16.620 --> 02:23.670 What to name this one as P, and then we are going to get the grade level of the student right. 02:26.860 --> 02:27.520 Student. 02:28.060 --> 02:29.200 Get the student first. 02:31.190 --> 02:35.300 Dot get the grade level greater than or equal to three. 02:37.180 --> 02:37.890 Have this ready. 02:37.920 --> 02:39.330 Next, let's create the P2. 02:40.320 --> 02:46.350 The P2 is going to be get GPA greater than or equal to 3.9. 02:48.530 --> 02:48.950 Okay. 02:49.490 --> 02:50.210 Sounds good. 02:50.570 --> 02:51.050 There we go. 02:51.140 --> 02:52.910 Now we are going to use this. 02:53.780 --> 02:55.220 If be one. 02:58.680 --> 02:59.490 And. 03:01.840 --> 03:02.320 To. 03:03.470 --> 03:04.790 God, just. 03:05.630 --> 03:06.320 As the student. 03:07.410 --> 03:07.910 Right. 03:07.920 --> 03:12.570 The next step is we are going to print the name and the list of activities. 03:12.600 --> 03:13.020 Right. 03:13.020 --> 03:15.840 For that, I'm going to create a bi consumer. 03:16.870 --> 03:20.170 Because we can achieve that using the single by consumer itself. 03:21.310 --> 03:27.520 So we are going to print the name, which is of type string and the activities which is of type list 03:27.520 --> 03:28.180 of string. 03:28.990 --> 03:30.670 Okay, let's import the list. 03:30.700 --> 03:33.750 I'm using the option and enter Target. 03:33.880 --> 03:36.130 You can see all the shortcut that I'm using here. 03:36.130 --> 03:38.980 It will be printed over the window. 03:40.950 --> 03:47.250 And I'm going to name this one as student by consumer equal to. 03:48.600 --> 03:51.660 I'll get the name and activities. 03:53.010 --> 03:58.950 We don't have to provide the type because Lambda is smart enough to determine the type by looking at 03:58.950 --> 04:02.100 the by consumer type that is defined as part of it. 04:03.050 --> 04:06.290 And then the next step is system dot out dot print. 04:06.290 --> 04:12.970 Ln name we're going to have a colon in between plus the activities. 04:13.720 --> 04:16.090 So we have the bi consumer also ready. 04:17.620 --> 04:22.330 So we are going to do by consumer dot accept. 04:23.130 --> 04:23.880 Let's pass the. 04:25.300 --> 04:25.480 It. 04:28.500 --> 04:29.970 Not yet. 04:30.000 --> 04:30.480 Name. 04:31.400 --> 04:32.060 And. 04:34.940 --> 04:39.530 It's going to accept two parameters because it's a bi consumer and. 04:41.560 --> 04:42.310 Activities. 04:43.530 --> 04:45.430 And I'm going to give a semicolon here. 04:45.450 --> 04:50.020 Now we have the functional interfaces implementations ready. 04:50.040 --> 04:53.940 Now the next step is we have to call this method, right? 04:54.360 --> 04:55.770 I'm going to call this method. 04:55.800 --> 04:58.980 But prior to that, I'm going to get the list of students. 05:00.590 --> 05:04.790 The students going to be a student list? 05:05.690 --> 05:11.810 I'm going to call the student database dot, get all students, which will give me the list of student. 05:11.810 --> 05:14.360 And the next step is I'm going to pass. 05:16.840 --> 05:21.890 The new predicate and consumer example dot print name and activities. 05:21.910 --> 05:27.010 Right now this print name and activities method doesn't accept any parameters. 05:27.610 --> 05:28.900 I'm going to pass a. 05:30.050 --> 05:31.710 Partial the list of student as part of it. 05:33.210 --> 05:34.080 Print list. 05:40.440 --> 05:41.370 We're getting this. 05:42.060 --> 05:47.310 The next step is I'm going to call students dot rich. 05:47.640 --> 05:50.760 Now we have this student consumer ready. 05:51.210 --> 05:54.780 Just call this dot Accept. 06:00.390 --> 06:04.730 We don't even have to pass anything because it is already iterating the for each method is going to 06:04.730 --> 06:07.150 iterate and pass the shouldn't already. 06:07.160 --> 06:12.950 Now this shouldn't consumer is going to get the shouldn't and perform all the test operation. 06:12.950 --> 06:14.360 Basically it is going to apply. 06:14.360 --> 06:20.690 The grade level is greater than three or the grade and the level is greater than 3.9. 06:20.690 --> 06:26.720 And then it is going to use the by consumer in order to print the name and activities in the console. 06:27.200 --> 06:28.790 Let's go ahead and run this. 06:31.430 --> 06:32.150 There you go. 06:32.270 --> 06:34.970 It printed the name and its respective activities. 06:36.720 --> 06:44.550 The advantage with this kind of code is completely modularized and it is really easy to modify the functionality 06:44.550 --> 06:48.180 if something else needs to be changed or added to the code. 06:48.210 --> 06:50.340 With this, we came to the end of this tutorial. 06:50.370 --> 06:51.510 Thank you for watching.