Restore

PastAssignments/Assignment4/Assignment4_2230026071/Question3/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

PastAssignments/Assignment4/Assignment4_2230026071/Question3/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Question3</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

PastAssignments/Assignment4/Assignment4_2230026071/Question3/.settings/org.eclipse.core.resources.prefs

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+eclipse.preferences.version=1
+encoding/<project>=UTF-8

PastAssignments/Assignment4/Assignment4_2230026071/Question3/src/Course.java

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+
+public abstract class Course {
+	//instance variables
+	private String code;
+	private String title;
+	private Course preRequisite;
+	
+	//constructor
+	public Course(String code, String title, Course preRequisite) {
+		if(preRequisite != null) {
+			this.code = code;
+			this.title = title;
+			this.preRequisite = preRequisite;
+		}
+		else {
+			System.out.println("pre-requisite course cannot null!");
+			return;
+		}
+	}
+	
+	//methods
+	public String getCode() {return this.code;}
+	
+	public String getTitle() {return this.title;}
+	
+	public Course getPreRequisite() {return this.preRequisite;}
+	
+	public abstract boolean isRequired();
+	
+	//test
+	public static void testCourse() {
+		// Since we cannot create any Course object, the testCourse method of the Course class must be empty.
+	}
+}

PastAssignments/Assignment4/Assignment4_2230026071/Question3/src/MajorElective.java

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+
+public class MajorElective extends Course{
+	//constructor
+	public MajorElective(String code, String title, MajorRequired preRequisite) {
+		super(code, title, preRequisite);
+	}
+	
+	//method
+	@Override
+	public boolean isRequired() {return true;}
+	
+	//test
+	public static void testMajorElective() {
+		// Since we cannot create any MajorRequired object,
+		// the testMajorElective method of the Course class must be empty.
+	}
+}

PastAssignments/Assignment4/Assignment4_2230026071/Question3/src/MajorRequired.java

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+
+public class MajorRequired extends Course{
+	//constructor
+	public MajorRequired(String code, String title, MajorRequired preRequisite) {
+		super(code, title, preRequisite);
+	}
+	
+	//method
+	@Override
+	public boolean isRequired() {return true;}
+	
+	//test
+	public static void testMajorRequired() {
+		// Since we cannot create any MajorRequired object, the testMajorRequired method of the Course class must be empty.
+	}
+}

PastAssignments/Assignment4/Assignment4_2230026071/Question3/src/Start.java

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+
+public class Start {
+	public static void main(String[] args) {
+		Course.testCourse();
+		MajorRequired.testMajorRequired();
+		MajorElective.testMajorElective();
+	}
+}