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Methodology-Grading-System
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王宇洋 3 years ago
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Software Methodology 11.15.md
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# Software Methodology 11.15
## WangYuyang 19372316
## Design Pattern
The design pattern I chose is the **factory pattern**. First, in this program the user wants to create a grading algorithm, as long as he knows its name, and does not need to care about its specific implementation. Secondly, the extensibility is high, if needed to add a new grading algorithm, just change the factory class. At last, Shielding the specific implementation of the product, the caller only needs to care about the interface of the product
## Class Diagram
![class-diagram](class-diagram.png)
## Code
### GradingScheme.java
```java
public interface GradingScheme {
public double getGrade(double assignment, double exam);
}
```
### GradingSchemeFactory.java
```java
public class GradingSchemeFactory {
public static enum Scheme {
TYPE_A,
TYPE_B
}
public GradingScheme getGradingScheme(Scheme scheme){
if(scheme == Scheme.TYPE_A){
return new MarkingAlgorithm(0.4,0.6);
}
else if(scheme == Scheme.TYPE_B){
return new MarkingAlgorithm(0.5,0.5);
}
throw new RuntimeException("Unknown scheme");
}
}
```
### MarkingAlgorithm.java
```java
public class MarkingAlgorithm implements GradingScheme {
private double assignmentContribution;
private double examContribution;
public MarkingAlgorithm(double assignmentContribution, double examContribution) {
if ((assignmentContribution < 0 || assignmentContribution > 1)
|| (examContribution < 0 || examContribution > 1)) {
throw new RuntimeException(
"The assignment contribution and " +
"exam contribution should be " +
"between 0 and 1, now: " +
assignmentContribution +
" " +
examContribution);
}
if ((assignmentContribution + examContribution) != 1) {
throw new RuntimeException("The sum of assignment contribution and " +
"exam contribution should be " +
"1, now: " +
(assignmentContribution + examContribution));
}
this.assignmentContribution = assignmentContribution;
this.examContribution = examContribution;
}
@Override
public double getGrade(double assignment, double exam) {
return assignmentContribution * assignment + examContribution * exam;
}
}
```
### Student.java
```java
public class Student {
private String name; // full name of the student
private Double assignment; // score for the assignment
private Double exam; // score for the exam
private GradingScheme gradingScheme;
/**
* Construct the student from their name
* @param name full name of the student
*/
public Student(String name) {
this.name = name;
assignment = 0.0;
exam = 0.0;
}
/**
* @return the student's full name
*/
public String getName() {
return name;
}
/**
* @param as the assignment score to set
*/
public void setAssignmentScore(double as) {
assignment = as;
}
/**
* @param es the exam score to set
*/
public void setExamScore(double es) {
exam = es;
}
// TODO get the final score
public Double getFinalScore() {
if(gradingScheme == null) {
throw new RuntimeException("Grading scheme not set");
}
return gradingScheme.getGrade(assignment, exam);
}
public void setGradingScheme(GradingScheme gradingScheme) {
this.gradingScheme = gradingScheme;
}
}
```
### TestCase.java
```java
public class TestCase {
public static void main(String[] args) {
Student student = new Student("Harry Potter");
student.setAssignmentScore(88);
student.setExamScore(66);
GradingSchemeFactory factory = new GradingSchemeFactory();
// TODO switch to algorithm A:
student.setGradingScheme(
factory.getGradingScheme(
GradingSchemeFactory.Scheme.TYPE_A
));
System.out.println(
student.getName()
+ " "
+ student.getFinalScore().toString());
// TODO switch to algorithm B
student.setGradingScheme(
factory.getGradingScheme(
GradingSchemeFactory.Scheme.TYPE_B
));
System.out.println(
student.getName()
+ " "
+ student.getFinalScore().toString());
}
}
```
## Output
```shell
Harry Potter 74.80000000000001
Harry Potter 77.0
```

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src/com/echo/GradingScheme.java
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package com.echo;
/**
* @Author: WangYuyang
* @Date: 2021/11/15-14:56
* @Project: Methodology
* @Package: com.echo
* @Description:
**/
public interface GradingScheme {
public double getGrade(double assignment, double exam);
}

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src/com/echo/GradingSchemeFactory.java
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package com.echo;
/**
* @Author: WangYuyang
* @Date: 2021/11/15-15:20
* @Project: Methmology
* @Package: com.echo
* @Description:
**/
public class GradingSchemeFactory {
public static enum Scheme {
TYPE_A,
TYPE_B
}
public GradingScheme getGradingScheme(Scheme scheme){
if(scheme == Scheme.TYPE_A){
return new MarkingAlgorithm(0.4,0.6);
}
else if(scheme == Scheme.TYPE_B){
return new MarkingAlgorithm(0.5,0.5);
}
throw new RuntimeException("Unknown scheme");
}
}

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src/com/echo/MarkingAlgorithm.java
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package com.echo;
/**
* @Author: WangYuyang
* @Date: 2021/11/15-14:58
* @Project: Methodology
* @Package: com.echo
* @Description:
**/
public class MarkingAlgorithm implements GradingScheme {
private double assignmentContribution;
private double examContribution;
public MarkingAlgorithm(double assignmentContribution, double examContribution) {
if ((assignmentContribution < 0 || assignmentContribution > 1)
|| (examContribution < 0 || examContribution > 1)) {
throw new RuntimeException(
"The assignment contribution and " +
"exam contribution should be " +
"between 0 and 1, now: " +
assignmentContribution +
" " +
examContribution);
}
if ((assignmentContribution + examContribution) != 1) {
throw new RuntimeException("The sum of assignment contribution and " +
"exam contribution should be " +
"1, now: " +
(assignmentContribution + examContribution));
}
this.assignmentContribution = assignmentContribution;
this.examContribution = examContribution;
}
@Override
public double getGrade(double assignment, double exam) {
return assignmentContribution * assignment + examContribution * exam;
}
}

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src/com/echo/Student.java
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package com.echo;
public class Student {
private String name; // full name of the student
private Double assignment; // score for the assignment
private Double exam; // score for the exam
private GradingScheme gradingScheme;
/**
* Construct the student from their name
* @param name full name of the student
*/
public Student(String name) {
this.name = name;
assignment = 0.0;
exam = 0.0;
}
/**
* @return the student's full name
*/
public String getName() {
return name;
}
/**
* @param as the assignment score to set
*/
public void setAssignmentScore(double as) {
assignment = as;
}
/**
* @param es the exam score to set
*/
public void setExamScore(double es) {
exam = es;
}
// TODO get the final score
public Double getFinalScore() {
if(gradingScheme == null) {
throw new RuntimeException("Grading scheme not set");
}
return gradingScheme.getGrade(assignment, exam);
}
public void setGradingScheme(GradingScheme gradingScheme) {
this.gradingScheme = gradingScheme;
}
}

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src/com/echo/TestCase.java
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package com.echo;
public class TestCase {
public static void main(String[] args) {
Student student = new Student("Harry Potter");
student.setAssignmentScore(88);
student.setExamScore(66);
GradingSchemeFactory factory = new GradingSchemeFactory();
// TODO switch to algorithm A:
student.setGradingScheme(
factory.getGradingScheme(
GradingSchemeFactory.Scheme.TYPE_A
));
System.out.println(
student.getName()
+ " "
+ student.getFinalScore().toString());
// TODO switch to algorithm B
student.setGradingScheme(
factory.getGradingScheme(
GradingSchemeFactory.Scheme.TYPE_B
));
System.out.println(
student.getName()
+ " "
+ student.getFinalScore().toString());
}
}
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