a4 close #6

2022-04-21 15:43:38 +08:00
parent 8bb5c66d2c
commit 941b3d26d4
27 changed files with 1525 additions and 0 deletions
--- a/assignment4/Question5/Course.java
+++ b/assignment4/Question5/Course.java
@@ -0,0 +1,113 @@
+/*
+ * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
+ * Date: 2022-04-18
+ * Description: This is the Course class.
+ */
+
+public abstract class Course implements Learnable {
+	/**
+	 * The code of the course.
+	 */
+	private String code;
+
+	/**
+	 * The title of the course.
+	 */
+	private String title;
+
+	/**
+	 * The pre-requisite of the course.
+	 *
+	 * A course always has only one pre-requisite course and the pre-requisite
+	 * course cannot be null.
+	 *
+	 * @see Course
+	 */
+	private Learnable preRequisite;
+
+	/**
+	 * Constructor.
+	 *
+	 * @param code         The code of the course.
+	 * @param title        The title of the course.
+	 * @param preRequisite The pre-requisite of the course. If the pre-requisite
+	 *                     course is null, the constructor will print a message of
+	 *                     "pre-requisite course cannot be null!" and return
+	 *                     directly.
+	 */
+	public Course(String code, String title, Learnable preRequisite) {
+		if (preRequisite == null) {
+			System.out.println("pre-requisite course cannot be null!");
+			return;
+		}
+
+		this.code = code;
+		this.title = title;
+		this.preRequisite = preRequisite;
+	}
+
+	/**
+	 * Get the code of the course.
+	 *
+	 * @return The code of the course.
+	 */
+	public String getCode() {
+		return code;
+	}
+
+	/**
+	 * Get the title of the course.
+	 *
+	 * @return The title of the course.
+	 */
+	public String getTitle() {
+		return title;
+	}
+
+	/**
+	 * Get the pre-requisite of the course.
+	 *
+	 * @return The pre-requisite of the course.
+	 */
+	public Learnable getPreRequisite() {
+		return preRequisite;
+	}
+
+	/**
+	 * Indicate whether a course is required or not.
+	 *
+	 * One course could either be a required course or a elective course. Some
+	 * courses are required, while the others are not required.
+	 *
+	 * @return True if the course is required, false if the course is not required.
+	 */
+	public abstract boolean isRequired();
+
+	/**
+	 * Test.
+	 */
+	public static void testCourse() {
+		Course mr = new Course("CS101", "Intro to Java", null) {
+			@Override
+			public boolean isRequired() {
+				return true;
+			}
+		};
+		System.out.println(mr.getCode() == null);
+		System.out.println(mr.getTitle() == null);
+		System.out.println(mr.getPreRequisite() == null);
+		System.out.println(mr.isRequired() == true);
+
+		Course me = new Course("CS102", "Intro to Python", mr) {
+			@Override
+			public boolean isRequired() {
+				return false;
+			}
+		};
+		System.out.println(me.getCode() == "CS102");
+		System.out.println(me.getTitle() == "Intro to Python");
+		System.out.println(me.getPreRequisite() == mr);
+		System.out.println(me.isRequired() == false);
+
+	}
+}