WEBVTT 00:00.020 --> 00:00.530 Hi everyone. 00:00.530 --> 00:01.930 Welcome back to this tutorial. 00:01.940 --> 00:06.230 In this tutorial we will talk about supplier functional interface. 00:06.230 --> 00:08.300 Let's explore and code this one. 00:09.770 --> 00:16.070 First up, I'm going to search for the supplier functional interface and it is part of the Java.util 00:16.070 --> 00:17.480 dot function package. 00:17.730 --> 00:18.620 Select that. 00:19.680 --> 00:20.420 You take a look at it. 00:20.430 --> 00:25.740 It got introduced as part of Java eight and it has the functional interface annotation. 00:26.660 --> 00:33.050 This particular functional interface has just one method called get, and it returns something to the 00:33.050 --> 00:33.610 caller. 00:33.620 --> 00:36.890 So basically it is going to return a type to the caller. 00:37.070 --> 00:41.660 This one is exactly opposite to the consumer function interface. 00:42.020 --> 00:44.600 Compare this to search for consumer. 00:45.410 --> 00:49.190 The consumer is again part of the Java.util dot function package. 00:49.400 --> 00:50.970 We take a look at the consumer. 00:50.990 --> 00:54.740 It accepts an input and it doesn't return any output. 00:54.740 --> 01:00.950 But supplier doesn't take any input, but it returns an output. 01:01.460 --> 01:02.960 Let's go ahead and code this one. 01:07.270 --> 01:08.110 A player. 01:14.230 --> 01:15.760 I make this class executable? 01:15.970 --> 01:17.740 Add public static, void main. 01:18.100 --> 01:18.880 There you go. 01:19.300 --> 01:23.110 And then let's create an instance of a player. 01:23.680 --> 01:24.550 A player. 01:27.040 --> 01:30.370 So it is going to return a student object. 01:33.300 --> 01:36.630 As part of this one, I'm going to name this one as student sub player. 01:36.870 --> 01:41.040 So what it is going to do is it is going to return a student, Right. 01:41.520 --> 01:43.740 So it doesn't take any input. 01:44.850 --> 01:46.130 And then we're going to have it like this. 01:46.140 --> 01:51.710 It is going to return a student, new student. 01:51.930 --> 01:59.400 So if you take a look at the student, it accepts name, grade level GPA, gender and list of activities. 02:00.030 --> 02:03.190 So I'm going to open I'm going to expand this data package. 02:03.190 --> 02:05.140 It's going to have the student database. 02:05.410 --> 02:06.730 I'm going to copy one of these. 02:06.730 --> 02:07.420 And then. 02:08.640 --> 02:09.240 Senate under. 02:11.370 --> 02:12.090 Then statement. 02:13.300 --> 02:13.860 There you go. 02:13.870 --> 02:15.190 So this one. 02:16.410 --> 02:18.590 Is going to return a student. 02:19.990 --> 02:20.470 Right. 02:21.070 --> 02:22.000 Let's call this one. 02:22.000 --> 02:23.890 How do we invoke the supplier? 02:28.680 --> 02:36.120 Thus I'm going to call student supplier as soon as I press the I mean, as soon as I enter that it is 02:36.120 --> 02:42.780 going to give me this get method that this get method is going to return the student that is as part 02:42.780 --> 02:44.340 of the student supplier. 02:46.250 --> 02:47.270 Function interface. 02:47.950 --> 02:50.470 Now let's take a look at one more example. 02:51.360 --> 02:52.500 Go to the student database. 02:52.500 --> 02:55.440 Here we are having a static method. 02:55.440 --> 02:58.530 This static method is returning the list of students. 02:59.040 --> 03:02.880 How can we achieve the same thing using the supplier? 03:03.720 --> 03:06.240 So let's create one more instance of supplier. 03:07.050 --> 03:14.550 The player is going to take the input as meaning the type as list of students. 03:16.430 --> 03:17.210 And then. 03:19.880 --> 03:20.780 Give it a name. 03:22.050 --> 03:23.100 The supplier. 03:23.920 --> 03:25.570 This is going to. 03:26.940 --> 03:28.200 Of something like. 03:30.060 --> 03:31.530 It doesn't take an input. 03:33.070 --> 03:36.280 Student database dot get all students. 03:36.910 --> 03:44.200 So this student supplier instance, meaning the list of player instance is going to return you a list 03:44.200 --> 03:48.940 of students instead of a single student that we coded just a moment ago. 03:49.420 --> 03:52.120 Now I'm going to call this. 03:53.430 --> 03:57.540 Students are the colon. 03:57.660 --> 04:00.210 Then list supplier dot. 04:03.700 --> 04:05.080 I run this example. 04:05.820 --> 04:08.200 See here it printed all the students. 04:09.430 --> 04:16.300 Let's summarize this one supplier doesn't take any input, but when it's invoked, it is going to supply 04:16.300 --> 04:17.620 something to the caller. 04:18.190 --> 04:20.110 With this, we came to the end of this tutorial. 04:20.140 --> 04:21.310 Thank you for watching.