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These are the user uploaded subtitles that are being translated: 1 1 00:00:01,368 --> 00:00:02,832 Alright, let's dive into Eclipse 2 2 00:00:02,832 --> 00:00:04,694 and let's write some code. 3 3 00:00:04,694 --> 00:00:06,327 line:15% So what I wanna do is continue to use that 4 4 00:00:06,327 --> 00:00:07,717 line:15% existing project that we created 5 5 00:00:07,717 --> 00:00:09,615 line:15% in some of the previous videos. 6 6 00:00:09,615 --> 00:00:13,635 line:15% And I'll start off by first creating a package. 7 7 00:00:13,635 --> 00:00:15,569 line:15% So I'll just right click on the source directory. 8 8 00:00:15,569 --> 00:00:17,319 line:15% I'll say new package. 9 9 00:00:20,544 --> 00:00:22,426 And the name I'll give for the package here, 10 10 00:00:22,426 --> 00:00:25,509 I'll call it com.luv2code.springdemo. 11 11 00:00:26,343 --> 00:00:28,954 'Cause we love to code. 12 12 00:00:28,954 --> 00:00:30,013 And once you're happy with that, 13 13 00:00:30,013 --> 00:00:32,937 we'll go ahead and hit the finish button. 14 14 00:00:32,937 --> 00:00:34,573 Alright so we have this basic package. 15 15 00:00:34,573 --> 00:00:37,130 line:15% Now the first thing I wanna do is create the 16 16 00:00:37,130 --> 00:00:38,473 line:15% baseball coach. 17 17 00:00:38,473 --> 00:00:41,412 line:15% So it's a simple pojo, or plain old java object, 18 18 00:00:41,412 --> 00:00:45,245 line:15% so I'll do a right click, I'll say new, class. 19 19 00:00:47,689 --> 00:00:51,106 For the name, I'll call it BaseballCoach. 20 20 00:00:52,056 --> 00:00:54,193 And I'll keep all the other defaults here. 21 21 00:00:54,193 --> 00:00:56,776 And I'll hit the finish button. 22 22 00:01:01,360 --> 00:01:02,193 Alright so here we go. 23 23 00:01:02,193 --> 00:01:04,721 Our very basic class called BaseballCoach. 24 24 00:01:04,721 --> 00:01:06,561 Let me go ahead and 25 25 00:01:06,561 --> 00:01:08,235 zoom for a bit. 26 26 00:01:08,235 --> 00:01:11,400 line:15% And I really wanna create just one method here. 27 27 00:01:11,400 --> 00:01:15,317 line:15% This one method will be called getDailyWorkout. 28 28 00:01:16,248 --> 00:01:18,831 line:15% And it's gonna return a string. 29 29 00:01:19,800 --> 00:01:21,358 So here I'll say, 30 30 00:01:21,358 --> 00:01:23,200 I dunno, makin' somethin' up here. 31 31 00:01:23,200 --> 00:01:26,760 I'll spend 30 minutes in the batting cage. 32 32 00:01:26,760 --> 00:01:29,393 Or spend 30 minutes on batting practice. 33 33 00:01:29,393 --> 00:01:31,060 That's close enough. 34 34 00:01:34,313 --> 00:01:36,762 So again, just a very simple implementation here 35 35 00:01:36,762 --> 00:01:39,096 of this BaseballCoach for that method, 36 36 00:01:39,096 --> 00:01:40,429 getDailyWorkout. 37 37 00:01:42,384 --> 00:01:43,746 And then kinda just stepping back, 38 38 00:01:43,746 --> 00:01:46,722 line:15% remember, we're building this little app 39 39 00:01:46,722 --> 00:01:48,416 line:15% that's gonna talk to the baseball coach 40 40 00:01:48,416 --> 00:01:49,436 line:15% and get daily workout 41 41 00:01:49,436 --> 00:01:51,434 line:15% so we can kinda check the box there. 42 42 00:01:51,434 --> 00:01:54,601 line:15% This baseball coach class is complete. 43 43 00:01:55,811 --> 00:01:57,733 line:15% Alright, so let's move back over here 44 44 00:01:57,733 --> 00:02:00,277 line:15% and let's go ahead and create another class here. 45 45 00:02:00,277 --> 00:02:03,392 line:15% Let's go ahead and create the MyApp class. 46 46 00:02:03,392 --> 00:02:07,475 line:15% So I just do a right click, and I say new, class. 47 47 00:02:09,617 --> 00:02:12,777 The actual name I'll give for it is MyApp. 48 48 00:02:12,777 --> 00:02:14,295 And then one thing I'll do here at the bottom 49 49 00:02:14,295 --> 00:02:18,248 is that I'll check the box here to give us a main method. 50 50 00:02:18,248 --> 00:02:23,116 This will be the main program for our application. 51 51 00:02:23,116 --> 00:02:25,199 And then I'll hit finish. 52 52 00:02:33,109 --> 00:02:34,698 Alright so here's our MyApp class, 53 53 00:02:34,698 --> 00:02:36,198 has a main method. 54 54 00:02:37,151 --> 00:02:38,660 Now I'll just go ahead and write some comments 55 55 00:02:38,660 --> 00:02:39,937 as far as the type of work I wanna do. 56 56 00:02:39,937 --> 00:02:41,819 So I say create the object 57 57 00:02:41,819 --> 00:02:43,483 and then use the object. 58 58 00:02:43,483 --> 00:02:46,150 Very simple, nothing fancy here. 59 59 00:02:48,249 --> 00:02:49,983 line:15% So again, just putting in the little diagram, 60 60 00:02:49,983 --> 00:02:52,387 line:15% so our app's gonna talk to the BaseballCoach. 61 61 00:02:52,387 --> 00:02:54,466 line:15% So that means I need to create the Coach object. 62 62 00:02:54,466 --> 00:02:58,633 line:15% So I need to say theCoach equals new BaseballCoach. 63 63 00:02:59,716 --> 00:03:01,883 line:15% So at this point I have the object created 64 64 00:03:01,883 --> 00:03:06,403 line:15% and that's theCoach that we created in a previous file. 65 65 00:03:06,403 --> 00:03:07,922 line:15% Now I'll actually use it. 66 66 00:03:07,922 --> 00:03:09,977 line:15% And I'll just do a print line here. 67 67 00:03:09,977 --> 00:03:11,982 line:15% I'll make use of one of my sys out tricks. 68 68 00:03:11,982 --> 00:03:13,763 line:15% I'll says sys out, 69 69 00:03:13,763 --> 00:03:14,998 line:15% control space, 70 70 00:03:14,998 --> 00:03:17,694 line:15% and that'll actually give me this system out print line. 71 71 00:03:17,694 --> 00:03:19,835 line:15% Just a little Eclipse trick for you there. 72 72 00:03:19,835 --> 00:03:22,402 And I'll say System out print line theCoach dot 73 73 00:03:22,402 --> 00:03:24,044 getDailyWorkout, 74 74 00:03:24,044 --> 00:03:25,729 line:15% 'cause I wanna get the actual daily workout 75 75 00:03:25,729 --> 00:03:27,812 line:15% that I need for practice. 76 76 00:03:28,932 --> 00:03:30,997 line:15% And this kinda maps up with what we have here 77 77 00:03:30,997 --> 00:03:32,367 line:15% with that little diagram. 78 78 00:03:32,367 --> 00:03:33,249 line:15% So this looks good. 79 79 00:03:33,249 --> 00:03:35,494 line:15% So we have theBaseballCoach taken care of. 80 80 00:03:35,494 --> 00:03:39,134 line:15% And then we also have MyApp taken care of. 81 81 00:03:39,134 --> 00:03:43,134 So then let's go ahead and run this application. 82 82 00:03:47,370 --> 00:03:48,978 And we get the output, 83 83 00:03:48,978 --> 00:03:50,951 Spend 30 minutes on batting practice. 84 84 00:03:50,951 --> 00:03:52,918 And again, there's no rocket science here. 85 85 00:03:52,918 --> 00:03:54,148 This is kinda Java 101. 86 86 00:03:54,148 --> 00:03:56,024 We're creating objects and we're simply 87 87 00:03:56,024 --> 00:03:57,494 calling methods on it. 88 88 00:03:57,494 --> 00:04:00,911 So, hopefully you're okay with it so far. 89 89 00:04:01,966 --> 00:04:03,887 Alrighty, so let's go ahead and get that idea 90 90 00:04:03,887 --> 00:04:06,515 of the one requirement here that the app should work 91 91 00:04:06,515 --> 00:04:08,353 with any type of coach. 92 92 00:04:08,353 --> 00:04:10,604 So what we wanna do is make use of a software 93 93 00:04:10,604 --> 00:04:11,997 engineering best practice 94 94 00:04:11,997 --> 00:04:14,312 and that's to code to an interface. 95 95 00:04:14,312 --> 00:04:16,590 So instead of coding directly to theBaseballCoach 96 96 00:04:16,590 --> 00:04:18,961 implementation, we wanna make use of a well 97 97 00:04:18,961 --> 00:04:22,961 defined interface that all coaches will support. 98 98 00:04:27,337 --> 00:04:29,684 line:15% So, every coach is gonna have a method called 99 99 00:04:29,684 --> 00:04:31,224 line:15% getDailyWorkout. 100 100 00:04:31,224 --> 00:04:32,819 line:15% So let's go ahead and create this interface. 101 101 00:04:32,819 --> 00:04:35,261 line:15% So we're kind of doing some code refactoring here. 102 102 00:04:35,261 --> 00:04:37,754 line:15% I'll say right click, I'll say new, 103 103 00:04:37,754 --> 00:04:40,337 line:15% and then I'll choose interface. 104 104 00:04:46,993 --> 00:04:48,850 And the actual name of the interface I'll create, 105 105 00:04:48,850 --> 00:04:50,433 I'll call it Coach. 106 106 00:04:52,590 --> 00:04:54,195 And just a very simple interface 107 107 00:04:54,195 --> 00:04:55,866 and I'll keep all the other defaults here 108 108 00:04:55,866 --> 00:04:57,533 and I'll hit finish. 109 109 00:04:58,676 --> 00:05:00,570 line:15% Alright, so, now we have this interface, 110 110 00:05:00,570 --> 00:05:03,029 line:15% let's go ahead and add this one method, 111 111 00:05:03,029 --> 00:05:05,675 line:15% getDailyWorkout and just a semicolon. 112 112 00:05:05,675 --> 00:05:06,986 line:15% Now note here, 113 113 00:05:06,986 --> 00:05:07,858 line:15% or recall, 114 114 00:05:07,858 --> 00:05:10,249 line:15% an interface doesn't have any implementation code, 115 115 00:05:10,249 --> 00:05:12,160 line:15% it's only a specification. 116 116 00:05:12,160 --> 00:05:14,478 line:15% So they simply say, what is available 117 117 00:05:14,478 --> 00:05:16,204 line:15% but not how it's implemented. 118 118 00:05:16,204 --> 00:05:18,161 line:15% So the what portion of it is 119 119 00:05:18,161 --> 00:05:20,581 line:15% a method called getDailyWorkout. 120 120 00:05:20,581 --> 00:05:22,751 line:15% And then you'll have different coaches that'll implement 121 121 00:05:22,751 --> 00:05:26,918 line:15% this method depending on the type of coach that they are. 122 122 00:05:29,093 --> 00:05:30,984 Alright, so now let's go back to our BaseballCoach, 123 123 00:05:30,984 --> 00:05:32,704 line:15% we need to do some refactoring here. 124 124 00:05:32,704 --> 00:05:34,746 line:15% So, in our BaseballCoach we need to say 125 125 00:05:34,746 --> 00:05:38,452 line:15% that our BaseballCoach implements Coach. 126 126 00:05:38,452 --> 00:05:40,028 line:15% So that's that interface we just created. 127 127 00:05:40,028 --> 00:05:41,541 line:15% And also add overrides, 128 128 00:05:41,541 --> 00:05:43,836 line:15% meaning that this is the method that we override 129 129 00:05:43,836 --> 00:05:46,601 line:15% from that coach interface. 130 130 00:05:46,601 --> 00:05:48,119 line:15% So we're basically here just saying that our 131 131 00:05:48,119 --> 00:05:51,131 line:15% BaseballCoach is compliant by implementing 132 132 00:05:51,131 --> 00:05:53,246 line:15% a given Coach interface. 133 133 00:05:53,246 --> 00:05:56,010 line:15% So I can access the BaseballCoach specifically, 134 134 00:05:56,010 --> 00:05:58,722 line:15% or we can access it in a generic fashion 135 135 00:05:58,722 --> 00:06:00,988 using the coach interface. 136 136 00:06:00,988 --> 00:06:02,558 line:15% Alright, so let's make this small modification 137 137 00:06:02,558 --> 00:06:04,004 line:15% here to MyApps. 138 138 00:06:04,004 --> 00:06:06,444 line:15% So, I'm gonna change the variable on the left hand side, 139 139 00:06:06,444 --> 00:06:09,132 line:15% so instead of BaseballCoach, the impletmentation, 140 140 00:06:09,132 --> 00:06:12,687 line:15% I'm gonna say Coach, which is the interface. 141 141 00:06:12,687 --> 00:06:14,008 line:15% Alright, so at this point, 142 142 00:06:14,008 --> 00:06:16,833 line:15% we have theCoach which is just a generic interface 143 143 00:06:16,833 --> 00:06:19,989 line:15% that has a method called getDailyWorkout. 144 144 00:06:19,989 --> 00:06:21,070 line:15% So at this point 145 145 00:06:21,070 --> 00:06:24,659 line:15% line eleven can work with any Coach implementation 146 146 00:06:24,659 --> 00:06:27,535 line:15% that has the getDailyWorkout method. 147 147 00:06:27,535 --> 00:06:32,508 line:15% Alright, so let's go ahead and run this application. 148 148 00:06:32,508 --> 00:06:33,341 And wow! 149 149 00:06:34,520 --> 00:06:36,025 Nothing really different here, right? 150 150 00:06:36,025 --> 00:06:37,610 This is the same thing we saw before. 151 151 00:06:37,610 --> 00:06:39,568 But again, the code's gonna run exactly the same, 152 152 00:06:39,568 --> 00:06:41,799 however we've refactored the code 153 153 00:06:41,799 --> 00:06:44,034 and we've refined it to make it a little bit better 154 154 00:06:44,034 --> 00:06:47,098 to follow good software engineering practices. 155 155 00:06:47,098 --> 00:06:48,914 And what we're gonna do in the next video, 156 156 00:06:48,914 --> 00:06:51,170 is we're actually gonna add some more 157 157 00:06:51,170 --> 00:06:52,778 implementations to follow that one requirement 158 158 00:06:52,778 --> 00:06:56,040 that we had to make our app handle different 159 159 00:06:56,040 --> 00:06:58,159 types of coaches or different type of coach 160 160 00:06:58,159 --> 00:06:59,414 implementations. 161 161 00:06:59,414 --> 00:07:01,261 And we'll cover that in the next video. 162 162 00:07:01,261 --> 00:07:05,428 So, hang tight and I'll see you in the next video. 14534