WEBVTT 00:00.640 --> 00:01.210 Hi everyone. 00:01.210 --> 00:02.530 Welcome back to this tutorial. 00:02.530 --> 00:08.860 In this tutorial we will code and explore the is present and if present method that is part of the optional 00:08.860 --> 00:11.650 class in here, what we are going to do. 00:11.680 --> 00:15.010 I'm going to create a class in the optional package. 00:15.010 --> 00:26.260 The class name is going to be optional present example and then I'm going to have the class executable 00:26.440 --> 00:29.320 by adding the public static void main method. 00:30.380 --> 00:32.240 Let me put this in presentation mode. 00:33.710 --> 00:39.470 So the method that we are going to explore is going to be is present. 00:39.590 --> 00:44.900 We have seen some examples of is present already, but still I would like to cover this in this tutorial 00:44.900 --> 00:46.250 and if present. 00:48.350 --> 00:51.200 First, let's take a look at the Is present method. 00:51.660 --> 00:56.030 So I'm going to create an optional object of type string. 00:56.060 --> 00:58.940 I'm going to give it a name optional. 01:01.330 --> 01:06.160 And then I'm going to use the off nullable method, which is part of the optional to create an optional 01:06.160 --> 01:09.760 object optional dot of nullable. 01:09.880 --> 01:18.220 I'm going to give the string as hello optional and in here what I'm going to do, I'm going to use the 01:18.220 --> 01:22.960 Is present method and then show you what is that it is going to give you as an output. 01:23.140 --> 01:25.750 The optional dot is present. 01:26.500 --> 01:28.720 Let's run this example and then check the result. 01:30.150 --> 01:33.870 But on this example that is going to give me the value as true. 01:33.900 --> 01:39.690 Basically, it checks whether this optional object has some value in it or not. 01:39.720 --> 01:42.060 Let's say I'm going to pass null here. 01:45.030 --> 01:52.230 Those kind of scenarios is going to give you the value as false because this option doesn't have any 01:52.230 --> 01:53.850 value inside this. 01:54.850 --> 02:01.690 Basically, if you want to get to the value that it encapsulates what we do, we do optional Dot is 02:01.690 --> 02:02.020 present. 02:02.020 --> 02:06.070 This might this content might be a repeated content from the previous tutorial. 02:06.070 --> 02:11.230 But if you are if you're already aware of all this content, you can go ahead and move to the next topic, 02:11.230 --> 02:13.540 which I'm going to explain in a bit. 02:15.160 --> 02:22.990 And then this is going to be optional dot get, which will give you access to the actual value that 02:22.990 --> 02:24.310 it encapsulates. 02:25.690 --> 02:26.150 Here you go. 02:26.170 --> 02:27.650 It printed the Hello optional. 02:27.670 --> 02:31.060 Now let's go ahead and explore the if present method. 02:31.090 --> 02:38.230 So if present method is again almost similar to the is present method, but it gives you one additional 02:38.650 --> 02:39.820 logic. 02:39.850 --> 02:41.290 Let's explore that. 02:41.530 --> 02:45.540 So I'm going to do the optional dot if present. 02:45.550 --> 02:51.010 If you take a look at it, if present takes in an input as a consumer, we all know consumer takes in 02:51.010 --> 02:54.460 an input and it doesn't return any output, right? 02:54.460 --> 03:00.280 So what I'm going to do as soon as I type in s, IntelliJ is going to give me the recommendation to 03:00.280 --> 03:04.270 implement it and then I'm going to just print that string. 03:07.690 --> 03:09.100 So what it does. 03:10.530 --> 03:11.970 It does two things. 03:12.000 --> 03:19.560 First thing, it checks whether the optional has a value, and after that it it gives you the access 03:19.560 --> 03:20.880 to the actual value. 03:20.880 --> 03:23.130 And you can do any kind of operation you want. 03:23.160 --> 03:24.180 Here I'm just printing it. 03:24.180 --> 03:26.580 If you want some other operation, you can still do it. 03:26.580 --> 03:29.640 Let's say you want to call some other method or some other service. 03:29.640 --> 03:33.570 If that object is having any value, then you can go ahead and do that too. 03:33.780 --> 03:40.080 So the only difference is that is present will just tell you whether the value is present or not. 03:40.230 --> 03:48.570 But if present will tell you there is a value present or not, and then it gives you an additional operation 03:48.810 --> 03:52.050 that you can perform on top of that optional object. 03:52.970 --> 03:58.460 So this is all about the present and if present that are part of the optional class. 03:58.490 --> 04:00.480 With this, we came to the end of this tutorial. 04:00.500 --> 04:01.670 Thank you for watching.