Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 1 00:00:01,294 --> 00:00:02,849 Hey, real quick in this video 2 2 00:00:02,849 --> 00:00:04,927 we're gonna discuss constructor injection 3 3 00:00:04,927 --> 00:00:07,563 and what happens behind the scenes. 4 4 00:00:07,563 --> 00:00:10,380 So, we have our screen configuration file 5 5 00:00:10,380 --> 00:00:12,392 that's been created but you may wonder well, 6 6 00:00:12,392 --> 00:00:14,510 what really happens behind the scenes 7 7 00:00:14,510 --> 00:00:18,510 when Spring runs through or processes this file? 8 8 00:00:19,807 --> 00:00:22,632 So, behind the scenes the Spring framework 9 9 00:00:22,632 --> 00:00:26,430 will actually perform some operations for you 10 10 00:00:26,430 --> 00:00:28,987 based on information you have in the config file 11 11 00:00:28,987 --> 00:00:31,567 and I just want to kind of show you this code wise 12 12 00:00:31,567 --> 00:00:34,004 so you get a better feel for what happens. 13 13 00:00:34,004 --> 00:00:35,977 So, over on the left is our config file, 14 14 00:00:35,977 --> 00:00:37,353 over on the right is kind of the work 15 15 00:00:37,353 --> 00:00:41,121 that Spring will do for you behind the scenes. 16 16 00:00:41,121 --> 00:00:44,244 Alright, so when you create that first bean, 17 17 00:00:44,244 --> 00:00:47,251 myFortuneService of HappyFortuneService, 18 18 00:00:47,251 --> 00:00:50,591 behind the scenes Spring will actually construct 19 19 00:00:50,591 --> 00:00:51,882 that object for you, 20 20 00:00:51,882 --> 00:00:54,171 so they'll actually call the default constructor 21 21 00:00:54,171 --> 00:00:56,346 or the nor or constructor and they'll create 22 22 00:00:56,346 --> 00:00:58,187 a HappyFortuneService, 23 23 00:00:58,187 --> 00:01:01,690 and they'll give it the variable name of myFortuneService. 24 24 00:01:01,690 --> 00:01:03,993 Alright, so that covers that first piece of it, 25 25 00:01:03,993 --> 00:01:05,002 the first bean. 26 26 00:01:05,002 --> 00:01:09,833 Now moving forward there's also a second bean, myCoach, 27 27 00:01:09,833 --> 00:01:13,403 so here they'll actually create a new BaseballCoach 28 28 00:01:13,403 --> 00:01:15,744 and based on the information from your config file, 29 29 00:01:15,744 --> 00:01:17,904 they'll pass in a constructor argument 30 30 00:01:17,904 --> 00:01:19,314 and that's the same myFortuneService 31 31 00:01:19,314 --> 00:01:20,896 that we just created, 32 32 00:01:20,896 --> 00:01:23,027 so they'll create that BaseballCoach 33 33 00:01:23,027 --> 00:01:25,614 with that myFortuneService, 34 34 00:01:25,614 --> 00:01:28,030 and again, make this bean available. 35 35 00:01:28,030 --> 00:01:31,406 So, the key here is that Spring will do this work for you 36 36 00:01:31,406 --> 00:01:34,353 in the background and Spring's object factory 37 37 00:01:34,353 --> 00:01:36,952 when they kind of create your objects 38 38 00:01:36,952 --> 00:01:39,268 and they inject the dependencies, 39 39 00:01:39,268 --> 00:01:42,290 this is really what's going on behind the scenes 40 40 00:01:42,290 --> 00:01:44,584 when Spring processes your file. 41 41 00:01:44,584 --> 00:01:46,973 So, I hope this helps out a little bit. 42 42 00:01:46,973 --> 00:01:49,499 I wanted to kind of just cover that real quickly 43 43 00:01:49,499 --> 00:01:52,482 before we jumped into the actual coding. 44 44 00:01:52,482 --> 00:01:56,149 Alright, so I'll see you in the next video. 3850