a4 close #6

assignment4/Question4/MajorRequired.java

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+/*
+ * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
+ * Date: 2022-04-18
+ * Description: This is the MajorRequired class which is used to store the major and required courses.
+ */
+
+public class MajorRequired extends Course {
+	/**
+	 * Constructor.
+	 *
+	 * @param code         The code of the course.
+	 * @param title        The title of the course.
+	 * @param preRequisite The pre-requisite of the course. Type of MajorRequired
+	 *                     and cannot be null.
+	 */
+	public MajorRequired(String code, String title, MajorRequired preRequisite) {
+		super(code, title, preRequisite);
+	}
+
+	/**
+	 * MajorRequired course is required for all students.
+	 *
+	 * @return true
+	 */
+	@Override
+	public boolean isRequired() {
+		return true;
+	}
+
+	/**
+	 * Test.
+	 */
+	public static void testMajorRequired() {
+		MajorRequired mr1 = new MajorRequired("COMP3013", "Database Management System", null);
+		System.out.println(mr1.getCode() == null);
+		System.out.println(mr1.getTitle() == null);
+		System.out.println(mr1.getPreRequisite() == null);
+		System.out.println(mr1.isRequired() == true);
+
+		MajorRequired mr2 = new MajorRequired("COMP3013", "Database Management System", mr1);
+		System.out.println(mr2.getCode() == "COMP3013");
+		System.out.println(mr2.getTitle() == "Database Management System");
+		System.out.println(mr2.getPreRequisite() == mr1);
+		System.out.println(mr2.isRequired() == true);
+	}
+}