WEBVTT 00:00.870 --> 00:01.380 Hi everyone. 00:01.380 --> 00:02.550 Welcome back to this tutorial. 00:02.550 --> 00:07.290 In this tutorial we will code and explore the by predicate example. 00:07.290 --> 00:10.290 So by predicate is again a functional interface. 00:10.530 --> 00:12.270 Let's go ahead and explore that. 00:14.290 --> 00:17.770 It's part of the Java Radial dot function package. 00:17.980 --> 00:18.760 Click on that. 00:18.760 --> 00:21.850 Buy predicate is also similar to predicate. 00:21.880 --> 00:28.210 It has one method called test and it is accepting two inputs, but the return type is the same. 00:28.210 --> 00:33.580 It is going to return the boolean and it has another default method called and. 00:34.460 --> 00:39.620 A gate and or it has all the default method, whatever the predicate has. 00:39.920 --> 00:42.860 And it is going to behave the same as the predicate. 00:42.890 --> 00:47.290 The only difference is by predicate is for two input parameters. 00:47.300 --> 00:49.790 Predicate is for one input parameter. 00:50.680 --> 00:56.620 So in this example, what we coded as part of the previous tutorial here, we have a condition. 00:56.620 --> 01:03.340 We are using two different predicates in order to apply the filtering on the student list. 01:03.370 --> 01:09.490 Now what I'm going to do, I'm going to create a bi predicate instance and then use that bi predicate 01:09.490 --> 01:14.590 instance to apply the filtering of students from the student list. 01:15.400 --> 01:16.100 Masterpiece. 01:16.630 --> 01:18.600 Let's create the by predicate instance. 01:18.610 --> 01:20.980 If you take a look at it, the first one is an integer. 01:21.010 --> 01:22.660 The second one is a double, right? 01:22.820 --> 01:25.300 So let's define the types integer. 01:26.230 --> 01:27.040 And double. 01:27.760 --> 01:31.000 I'm going to name this one as my predicate. 01:31.360 --> 01:34.510 Now we have to pass into two values, right? 01:34.540 --> 01:38.830 The first one is grade level can give any value you want. 01:38.950 --> 01:40.670 It's just like a reference variable. 01:40.690 --> 01:42.100 The next thing is GPA. 01:44.290 --> 01:48.280 And then what it is going to do, it is going to check. 01:49.130 --> 01:51.140 The grade level. 01:52.880 --> 01:55.090 Is greater than or equal to three. 01:56.250 --> 01:56.940 And. 01:58.470 --> 02:03.070 GPA is greater than or equal to 3.9. 02:03.090 --> 02:06.720 So we are performing these two checks as part of this, right? 02:06.720 --> 02:12.450 So since it is a single line statement, you don't even have to provide the curly braces as part of 02:12.450 --> 02:13.470 the lambda body. 02:13.590 --> 02:19.470 So once this is evaluated, if this is true, true boolean result will be returned. 02:19.470 --> 02:23.940 If it is false, then false Boolean result will be returned as part of this. 02:24.120 --> 02:27.510 The next step is instead of this what I'm going to do. 02:28.640 --> 02:31.520 Going to call this dot test. 02:31.940 --> 02:33.530 We have to pass the inputs. 02:33.530 --> 02:37.220 The first one, if you take a look at it, it is a grade level, right? 02:37.250 --> 02:41.330 Get grade level, comma, student dot. 02:42.540 --> 02:43.880 Get GPA. 02:46.400 --> 02:52.640 And then is going to behave as let's go ahead and run this one and then check whether is it giving us 02:52.640 --> 02:55.430 the same result as it was prior to the by predicate? 02:58.000 --> 02:58.480 There you go. 02:58.510 --> 03:00.850 It printed the same result as before. 03:00.880 --> 03:07.090 We want you can create a multiple bike predicate instances and then you can use the and operation. 03:07.270 --> 03:14.260 So if you press command space or sorry, control space, it will give you all these different operations 03:14.260 --> 03:15.130 it supports. 03:15.220 --> 03:22.450 You can use and you can use n number of and or you can use or or different methods. 03:26.300 --> 03:26.660 Okay. 03:26.660 --> 03:28.190 I'm going to remove this for now. 03:31.840 --> 03:34.030 So this is all about by predicate. 03:34.060 --> 03:34.900 By predicate. 03:34.930 --> 03:40.300 To summarize this by predicate is basically is going to accept two parameters and perform some kind 03:40.300 --> 03:44.880 of operation on the input, whatever that is being passed to that by predicate instance. 03:44.890 --> 03:48.340 And it is going to return a Boolean value as a result. 03:48.370 --> 03:50.410 With this, we came to the end of this tutorial. 03:50.440 --> 03:51.460 Thank you for watching.