From b2d80610db6beda38573890ed169815e495bc663 Mon Sep 17 00:00:00 2001
From: Nguyễn Gia Phong <mcsinyx@disroot.org>
Date: Sun, 24 May 2020 16:34:31 +0700
Subject: [usth/ICT2.7] Engineer software

---
 ... Class Diagram: Relationships - lang_en_vs5.srt | 111 +++++++++++++++++++++
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(limited to 'usth/ICT2.7/P2L2 OO Software Engineering and UML Subtitles/16 - Class Diagram: Relationships - lang_en_vs5.srt')

diff --git a/usth/ICT2.7/P2L2 OO Software Engineering and UML Subtitles/16 - Class Diagram: Relationships - lang_en_vs5.srt b/usth/ICT2.7/P2L2 OO Software Engineering and UML Subtitles/16 - Class Diagram: Relationships - lang_en_vs5.srt
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+1
+00:00:00,130 --> 00:00:02,620
+And that's exactly what we're going to look at next,
+
+2
+00:00:02,620 --> 00:00:05,630
+relationships in the class diagram, how they're represented and
+
+3
+00:00:05,630 --> 00:00:08,010
+what they mean. First of all relationships as the
+
+4
+00:00:08,010 --> 00:00:12,550
+name says, describe interactions between classes or between objects in
+
+5
+00:00:12,550 --> 00:00:15,510
+my system. And we will describe three main types
+
+6
+00:00:15,510 --> 00:00:19,060
+of relationships. The first one is called a Dependency
+
+7
+00:00:19,060 --> 00:00:22,450
+relationship. And we can express that as X uses
+
+8
+00:00:22,450 --> 00:00:25,840
+Y and we represent it with a dashed directed line.
+
+9
+00:00:25,840 --> 00:00:28,170
+So when we have such a line between two classes
+
+10
+00:00:28,170 --> 00:00:31,020
+that means that the first class uses the second one. And
+
+11
+00:00:31,020 --> 00:00:33,520
+we're going to provide an example of a dependency in a
+
+12
+00:00:33,520 --> 00:00:37,960
+minute. The second type of relationship is an association that can
+
+13
+00:00:37,960 --> 00:00:40,880
+also be an aggregation. We'll see what the distinction is.
+
+14
+00:00:40,880 --> 00:00:43,470
+But basically, what this means is that we can express that
+
+15
+00:00:43,470 --> 00:00:47,640
+as a X has a y. So x contains a
+
+16
+00:00:47,640 --> 00:00:50,950
+y. And if it is in association, we indicate it with
+
+17
+00:00:50,950 --> 00:00:53,570
+a solid undirected line. If it's an aggregation,
+
+18
+00:00:53,570 --> 00:00:55,740
+we indicate it in the same way, but with
+
+19
+00:00:55,740 --> 00:00:58,510
+a diamond at one of the ends. Finally, the
+
+20
+00:00:58,510 --> 00:01:02,740
+third type of relationship is what is called Generalization.
+
+21
+00:01:02,740 --> 00:01:05,300
+And this can be expressed as x is a
+
+22
+00:01:05,300 --> 00:01:09,620
+y. So this is the relationship that expresses inheritance.
+
+23
+00:01:09,620 --> 00:01:13,600
+Specialization between two classes. It's represented with a solid
+
+24
+00:01:13,600 --> 00:01:16,190
+directed line with a large open arrow head at
+
+25
+00:01:16,190 --> 00:01:19,030
+the end. Going from the more specialized class to
+
+26
+00:01:19,030 --> 00:01:21,770
+the less specialized class. So going from the subclass to
+
+27
+00:01:21,770 --> 00:01:24,740
+the super class. So now let's look at each relationship
+
+28
+00:01:24,740 --> 00:01:28,360
+in more detail using our example, our course management system.
-- 
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