a4 close #6

assignment4/Question6/ManyCourses.java

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+/*
+ * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
+ * Date: 2022-04-18
+ * Description: This is the ManyCourses class.
+ */
+
+import java.util.ArrayList;
+
+public class ManyCourses {
+	private ArrayList<Learnable> courses;
+
+	/**
+	 * Constructor.
+	 */
+	public ManyCourses() {
+		courses = new ArrayList<Learnable>();
+	}
+
+	/**
+	 * Add a course to the list.
+	 *
+	 * @param course
+	 */
+	public void addCourse(Learnable c) {
+		courses.add(c);
+	}
+
+	/**
+	 * Prints on the screen the course code and title.
+	 */
+	public void listCourses() {
+		for (Learnable c : courses) {
+			System.out.println(
+					String.format("%s, %s", c.getCode(), c.getTitle()));
+		}
+	}
+
+	/**
+	 * Test.
+	 */
+	public static void testManyCourses() {
+		Base b = new Base("DS1001", "EntryCourse");
+		MajorRequired mr1 = new MajorRequired("DS200X", "OOP", b);
+		MajorElective me1 = new MajorElective("DS300X", "Data Mining", mr1);
+		ManyCourses mc = new ManyCourses();
+		mc.addCourse(b);
+		mc.addCourse(mr1);
+		mc.addCourse(me1);
+		mc.listCourses();
+	}
+}