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year2/semester1/logseq-stuff/pages/More Java Code.md

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+- #[[CT2106 - Object-Oriented Programming]]
+- **Previous Topic:** [[First Java Code]]
+- **Next Topic:** [[Variables & Types]]
+- **Relevant Slides:** ![Lecture03.pdf](../assets/Lecture03_1663063871202_0.pdf)
+-
+- # Composition & Inheritance
+	- ## Composition
+		- What is **Composition**? #card
+		  card-last-interval:: 28.3
+		  card-repeats:: 4
+		  card-ease-factor:: 2.66
+		  card-next-schedule:: 2022-12-09T18:41:43.657Z
+		  card-last-reviewed:: 2022-11-11T11:41:43.658Z
+		  card-last-score:: 5
+			- **Composition** is a type of "has-a" relationship. One object is **composed** of another and relies upon its services for its own functionality.
+			- It is one of the fundamental relationships between classes in OOP.
+			- For example:
+				- The class `RacingBike` **has-a** `Wheel` - **Composition**.
+		- How do you represent **Composition** in OOP class diagrams? #card
+		  card-last-interval:: 31.36
+		  card-repeats:: 4
+		  card-ease-factor:: 2.8
+		  card-next-schedule:: 2022-12-16T04:00:44.435Z
+		  card-last-reviewed:: 2022-11-14T20:00:44.435Z
+		  card-last-score:: 5
+			- In OOP class diagrams, a **diamond shape** indicates **composition** or a "has-a" relationship.
+			- ![image.png](../assets/image_1663271062397_0.png)
+				- This class diagram tells us that a `Vehicle` object is composed of a single `Engine` object.
+		- How do you realise **Composition** in Java? #card
+		  card-last-interval:: 9.28
+		  card-repeats:: 3
+		  card-ease-factor:: 2.32
+		  card-next-schedule:: 2022-11-23T22:28:13.350Z
+		  card-last-reviewed:: 2022-11-14T16:28:13.350Z
+		  card-last-score:: 3
+			- To realise a "has-a" relationship in Java, you must ^^create a link between the **participant classes** using a **reference type variable**.^^
+				- The reference declaration is in the **owner** class.
+		-
+	- # Inheritance
+		- What is **Inheritance**? #card
+		  card-last-interval:: 21.53
+		  card-repeats:: 4
+		  card-ease-factor:: 2.32
+		  card-next-schedule:: 2022-12-06T08:00:59.616Z
+		  card-last-reviewed:: 2022-11-14T20:00:59.616Z
+		  card-last-score:: 5
+			- **Inheritance** is a type of "is-a" relationship.
+			- It is one of the fundamental relationships between classes in OOP.
+			- For example:
+				- A `RacingBike` **is-a** type of `Bicycle` - **Inheritance**.
+	-
+-