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These are the user uploaded subtitles that are being translated: 1 1 00:00:00,975 --> 00:00:02,451 All right, so we have our app working 2 2 00:00:02,451 --> 00:00:03,618 with the BaseballCoach. 3 3 00:00:03,618 --> 00:00:05,475 Now, let's go ahead and add that new requirement 4 4 00:00:05,475 --> 00:00:07,902 of working with a different type of coach. 5 5 00:00:07,902 --> 00:00:10,950 So in my MainApp.java program, 6 6 00:00:10,950 --> 00:00:12,583 I'm gonna change it on the right-hand side, 7 7 00:00:12,583 --> 00:00:15,108 so instead of new BaseballCoach, 8 8 00:00:15,108 --> 00:00:17,525 I'm gonna say new TrackCoach. 9 9 00:00:21,692 --> 00:00:23,066 So, TrackCoach. 10 10 00:00:23,066 --> 00:00:26,166 But now, we don't have a TrackCoach class yet, 11 11 00:00:26,166 --> 00:00:29,282 that's why we have the little red, squiggly underneath that. 12 12 00:00:29,282 --> 00:00:31,166 And also, if we move over to the left-hand side 13 13 00:00:31,166 --> 00:00:33,499 and we click on this little red x, 14 14 00:00:33,499 --> 00:00:35,124 then Eclipse will give us some suggestions 15 15 00:00:35,124 --> 00:00:36,957 and, hmm, interesting. 16 16 00:00:38,473 --> 00:00:42,333 It can actually create the class TrackCoach for me. 17 17 00:00:42,333 --> 00:00:43,500 Mm, I like it. 18 18 00:00:44,379 --> 00:00:45,982 That's pretty cool. 19 19 00:00:45,982 --> 00:00:47,728 Let's try it, so let's go and select this option, 20 20 00:00:47,728 --> 00:00:49,841 Create class TrackCoach, 21 21 00:00:49,841 --> 00:00:52,017 and then, wow, this is great. 22 22 00:00:52,017 --> 00:00:54,090 So it has a name of TrackCoach 23 23 00:00:54,090 --> 00:00:57,107 and also, hmm, they're even gonna implement 24 24 00:00:57,107 --> 00:00:58,743 the interface for us, Coach, 25 25 00:00:58,743 --> 00:01:00,425 that we have from the previous slide. 26 26 00:01:00,425 --> 00:01:05,099 So this is looking pretty good here. (laughs) 27 27 00:01:05,099 --> 00:01:06,933 So let's go ahead and click Finish, 28 28 00:01:06,933 --> 00:01:09,275 and let's see what it does and 29 29 00:01:09,275 --> 00:01:10,108 boo-yah, 30 30 00:01:11,591 --> 00:01:13,745 Eclipse wrote some code for us. 31 31 00:01:13,745 --> 00:01:14,650 This is awesome. 32 32 00:01:14,650 --> 00:01:16,755 So they have the class TrackCoach, 33 33 00:01:16,755 --> 00:01:18,158 implements Coach, 34 34 00:01:18,158 --> 00:01:20,715 and they did the override for that one method, 35 35 00:01:20,715 --> 00:01:22,797 getDailyWorkout. 36 36 00:01:22,797 --> 00:01:25,973 Man, you gotta love that (laughs). 37 37 00:01:25,973 --> 00:01:27,306 Thanks, Eclipse. 38 38 00:01:29,075 --> 00:01:29,908 All right, so let's go ahead 39 39 00:01:29,908 --> 00:01:32,524 and get rid of that auto-generated stub 40 40 00:01:32,524 --> 00:01:35,366 and let's get rid of the null 41 41 00:01:35,366 --> 00:01:38,763 and let's return our workout as a TrackCoach. 42 42 00:01:38,763 --> 00:01:41,763 So we're gonna say, "Run a hard 5k." 43 43 00:01:42,949 --> 00:01:44,082 All right, so our track coach, 44 44 00:01:44,082 --> 00:01:45,865 they're gonna run us really hard, 45 45 00:01:45,865 --> 00:01:49,175 get us into shape for the next track meet. 46 46 00:01:49,175 --> 00:01:50,008 So there we go. 47 47 00:01:50,008 --> 00:01:52,025 So we have the implementation for this setup, 48 48 00:01:52,025 --> 00:01:55,541 so this is our new coach that we just created, TrackCoach, 49 49 00:01:55,541 --> 00:01:56,374 implements Coach, 50 50 00:01:56,374 --> 00:01:58,174 and we gave our custom implementation here 51 51 00:01:58,174 --> 00:01:59,841 for getDailyWorkout. 52 52 00:02:05,425 --> 00:02:08,522 So now, let me move back over to MyApp.java 53 53 00:02:08,522 --> 00:02:09,991 and now this works out just fine. 54 54 00:02:09,991 --> 00:02:11,457 We're in good shape. 55 55 00:02:11,457 --> 00:02:14,277 So we have a new TrackCoach, that class has been created. 56 56 00:02:14,277 --> 00:02:16,708 On the left-hand side, the assignments of theCoach interface 57 57 00:02:16,708 --> 00:02:20,550 because that TrackCoach implements theCoach interface, 58 58 00:02:20,550 --> 00:02:21,607 and will print it out. 59 59 00:02:21,607 --> 00:02:22,483 So let's go ahead and run it. 60 60 00:02:22,483 --> 00:02:25,815 So I'll just do a right-click, Run As, Java Application, 61 61 00:02:25,815 --> 00:02:28,608 and then woo-hoo, "Run a hard 5k," 62 62 00:02:28,608 --> 00:02:32,033 so that's our TrackCoach giving us our daily workout. 63 63 00:02:32,033 --> 00:02:33,407 This is pretty cool, I like it. 64 64 00:02:33,407 --> 00:02:34,499 And then the nice thing about it 65 65 00:02:34,499 --> 00:02:39,266 is that on line 11, we can handle any type of coach 66 66 00:02:39,266 --> 00:02:42,699 because we, again, were coding to the interface, 67 67 00:02:42,699 --> 00:02:44,616 not the implementation. 68 68 00:02:51,624 --> 00:02:53,739 So, we're almost there 69 69 00:02:53,739 --> 00:02:55,366 but again, this is a rough prototype. 70 70 00:02:55,366 --> 00:02:56,917 It's not 100% yet. 71 71 00:02:56,917 --> 00:02:59,025 And the reason it's not 100% 72 72 00:02:59,025 --> 00:03:02,949 is that one of those requirements that we had, 73 73 00:03:02,949 --> 00:03:05,175 one was that this should work with any type of coach 74 74 00:03:05,175 --> 00:03:07,117 and we kind of handled that part of it 75 75 00:03:07,117 --> 00:03:08,100 but the other requirement 76 76 00:03:08,100 --> 00:03:10,800 was that the actual coach implementation 77 77 00:03:10,800 --> 00:03:12,622 should be configurable 78 78 00:03:12,622 --> 00:03:15,916 and that right now, it's not really configurable 79 79 00:03:15,916 --> 00:03:19,216 because it's hardcoded right here. 80 80 00:03:19,216 --> 00:03:20,356 Ideally, it will be great 81 81 00:03:20,356 --> 00:03:24,900 if we could maybe read the actual implementation name 82 82 00:03:24,900 --> 00:03:27,913 from a config file, and then make use of it, 83 83 00:03:27,913 --> 00:03:29,899 so then we could easily swap 84 84 00:03:29,899 --> 00:03:32,356 by only changing a config file 85 85 00:03:32,356 --> 00:03:35,257 instead of having to change the source code. 86 86 00:03:35,257 --> 00:03:39,159 So in the next video, we'll look at Spring 87 87 00:03:39,159 --> 00:03:43,326 and Spring was designed to address this exact problem. 7144