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黑墨水鱼
2022-04-21 15:43:38 +08:00
parent 8bb5c66d2c
commit 941b3d26d4
27 changed files with 1525 additions and 0 deletions
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58
assignment4/Question6/Base.java Normal file
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/*
* Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
* Date: 2022-04-18
* Description: This is the Base Class.
*/
public class Base implements Learnable {
private String code;
private String title;
/**
* Constructor
*
* @param code The code of the course
* @param title The title of the course
*/
public Base(String code, String title) {
this.code = code;
this.title = title;
}
/**
* Getter of code
*
* @return The code of the course
*/
public String getCode() {
return code;
}
/**
* Getter of title
*
* @return The title of the course
*/
public String getTitle() {
return title;
}
/**
* Get the pre-requisite course. It will return itself.
*
* @return this
*/
public Learnable getPreRequisite() {
return this;
}
/**
* Test.
*/
public static void testBase() {
Base base = new Base("COMP3013", "Database Management System");
System.out.println(base.getCode() == "COMP3013");
System.out.println(base.getTitle() == "Database Management System");
System.out.println(base.getPreRequisite() == base);
}
}

113
assignment4/Question6/Course.java Normal file
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/*
* 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);
}
}

13
assignment4/Question6/Learnable.java Normal file
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/*
* Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
* Date: 2022-04-18
* Description: This is the Learnable interface.
*/
public interface Learnable {
public String getCode();
public String getTitle();
public Learnable getPreRequisite();
}

56
assignment4/Question6/MajorElective.java Normal file
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/*
* Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
* Date: 2022-04-18
* Description: This is the MajorElective class which is elective for students.
*/
public class MajorElective 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 MajorElective
* and cannot be null.
*/
public MajorElective(String code, String title, Learnable preRequisite) {
super(code, title, preRequisite);
}
/**
* MajorRequired course is elective for all students.
*
* @return false
*/
public boolean isRequired() {
return false;
}
/**
* Test.
*/
public static void testMajorElective() {
MajorElective pre = new MajorElective("CSC108", "Intro to Programming", null);
System.out.println(pre.getCode() == null);
System.out.println(pre.getTitle() == null);
System.out.println(pre.getPreRequisite() == null);
System.out.println(pre.isRequired() == false);
MajorElective pre2 = new MajorElective("CSC108", "Intro to Programming", pre);
System.out.println(pre2.getCode() == "CSC108");
System.out.println(pre2.getTitle() == "Intro to Programming");
System.out.println(pre2.getPreRequisite() == pre);
System.out.println(pre2.isRequired() == false);
Base base = new Base("COMP4023", "Software Engineering");
System.out.println(base.getCode() == "COMP4023");
System.out.println(base.getTitle() == "Software Engineering");
System.out.println(base.getPreRequisite() == base);
MajorElective me = new MajorElective("CSC123", "Big Data", base);
System.out.println(me.getCode() == "CSC123");
System.out.println(me.getTitle() == "Big Data");
System.out.println(me.getPreRequisite() == base);
System.out.println(me.isRequired() == false);
}
}

57
assignment4/Question6/MajorRequired.java Normal file
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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, Learnable 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);
Base base = new Base("COMP4023", "Software Engineering");
System.out.println(base.getCode() == "COMP4023");
System.out.println(base.getTitle() == "Software Engineering");
System.out.println(base.getPreRequisite() == base);
MajorRequired mr3 = new MajorRequired("COMP4101", "Quality Assurance", base);
System.out.println(mr3.getCode() == "COMP4101");
System.out.println(mr3.getTitle() == "Quality Assurance");
System.out.println(mr3.getPreRequisite() == base);
System.out.println(mr3.isRequired() == true);
}
}

51
assignment4/Question6/ManyCourses.java Normal file
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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();
}
}

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assignment4/Question6/Start.java Normal file
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/**
* Answer to the questions.
*
* - Q: What kinds of tests can you write inside the testCourse method?
*
* - A: You can inherit the Couse class to annonymous class and override the
* isRequired() method.
*
* - Q: What kinds of tests can you write inside the testMajorRequired method?
*
* - A: You can first create a MajorRequired object with null preRequisite and
* do the test as normal.
*
* - Q: What kinds of tests can you write inside the testMajorElective method?
*
* - A: You can first create a MajorElective object with null preRequisite and
* do the test as normal.
*/
public class Start {
public static void main(String[] args) {
Course.testCourse();
MajorRequired.testMajorRequired();
MajorElective.testMajorElective();
Base.testBase();
ManyCourses.testManyCourses();
}
}