WEBVTT 00:00.120 --> 00:00.680 Hi everyone. 00:00.680 --> 00:01.320 Welcome back. 00:01.320 --> 00:07.680 In this lecture we will go and learn about a new way of making the Java class executable by the JVM. 00:07.680 --> 00:12.160 So in this particular lecture we'll be working on the compact main package. 00:12.200 --> 00:15.680 If you expand this one you will see a class named Hello World. 00:15.720 --> 00:16.600 Let's open that. 00:16.640 --> 00:18.880 Traditionally every Java application. 00:19.120 --> 00:21.080 Let me add the public also over here. 00:21.080 --> 00:23.880 As you can see, the public is being made redundant. 00:23.880 --> 00:27.680 That means this public access modifier is not needed anymore. 00:27.720 --> 00:32.280 Actually, we can remove the public access modifier over there on top of it. 00:32.280 --> 00:35.880 There is also something called a compact source code. 00:35.880 --> 00:37.640 Let's go ahead and explore that one actually. 00:37.640 --> 00:40.040 So now I'm going to go to the compact main. 00:40.040 --> 00:42.040 And then I'm going to create a Java class. 00:42.040 --> 00:46.640 In here you will have a new option called Compact Source File. 00:46.640 --> 00:50.960 So now I'm going to be creating a class named Simple Hello World okay. 00:51.000 --> 00:53.840 And then click on the compact source here and press okay. 00:53.880 --> 00:54.920 It's in a different package. 00:54.920 --> 00:57.960 Let's go ahead and move it inside the compact main package. 00:58.000 --> 00:58.440 There you go. 00:58.480 --> 01:03.730 So now as you can see this particular class this class doesn't have a class name, and this class doesn't 01:03.730 --> 01:07.570 have the public static void main that we have over here. 01:07.570 --> 01:12.130 So traditionally before Java 25 you need to have public static void main. 01:12.130 --> 01:15.610 And also you need to have a class on top of it. 01:15.610 --> 01:18.650 And you can only have this main function within a class. 01:18.850 --> 01:20.890 That's not the case anymore actually. 01:20.890 --> 01:24.250 So now you can just provide the void main function. 01:24.250 --> 01:24.970 Over here. 01:25.010 --> 01:30.450 The JVM automatically creates an instance of the class and calls its main method. 01:30.490 --> 01:33.490 The benefit here is that it reduces verbosity. 01:33.490 --> 01:37.450 So now what I'm going to do I'm going to be copying this and put it over here. 01:37.450 --> 01:40.410 So as you can see we're pretty much doing the same thing over here. 01:40.410 --> 01:43.170 It's just that you need the simple main function. 01:43.170 --> 01:46.410 You don't need the class and also the main function in it. 01:46.410 --> 01:48.050 The main function just is enough. 01:48.050 --> 01:49.650 Let's go ahead and execute this program. 01:51.290 --> 01:51.890 There you go. 01:51.930 --> 01:55.490 You're able to see the result in the console which is hello world okay. 01:55.530 --> 01:58.010 And we have a new println function. 01:58.010 --> 02:01.330 So so far we have been using that System.out.println. 02:01.330 --> 02:01.390 println. 02:01.390 --> 02:01.710 Right? 02:01.710 --> 02:04.390 So you have new functions like io dot println. 02:04.430 --> 02:05.430 You can do this. 02:05.510 --> 02:07.310 It will give you the same result over here. 02:07.310 --> 02:09.670 And also you can actually add variables. 02:09.670 --> 02:13.390 So previously the main function can only access static variables. 02:13.390 --> 02:15.310 That's not the case anymore actually. 02:15.310 --> 02:18.230 So you can give any name you want in the source code file. 02:18.230 --> 02:21.470 And you will be able to access that in the main function. 02:21.470 --> 02:23.350 So here if you try to do the same thing. 02:23.390 --> 02:26.430 So let's say I'm going to be copying this and putting it over here. 02:26.430 --> 02:30.270 Let's say if I try to do the same thing over here, let's see what the result is going to be. 02:30.310 --> 02:35.870 So the result is going to be it will complain that non-static field name cannot be referenced from a 02:35.870 --> 02:37.190 static context. 02:37.190 --> 02:42.590 So you have one additional benefit is that you have the ability to declare the variables and also access 02:42.590 --> 02:44.150 them in your main function. 02:44.150 --> 02:46.390 Let's go ahead and execute this particular main function. 02:46.390 --> 02:47.110 There you go. 02:47.110 --> 02:49.790 So in the console we have the result as hello world. 02:50.350 --> 02:53.830 So this is one of the new feature that's part of the Java 25. 02:53.830 --> 02:56.910 And the benefit here is that it reduces the verbosity. 02:57.230 --> 03:00.670 And this also keeps your class concise and easy to read. 03:00.670 --> 03:01.790 This marks the end of this lecture. 03:01.790 --> 03:02.670 Thank you for watching.