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704 lines
25 KiB
HTML
704 lines
25 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>Software Methodology 11.15</title>
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<style type="text/css">
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body {
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font-family: Helvetica, arial, sans-serif;
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line-height: 1.6;
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/**
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* prism.js tomorrow night eighties for JavaScript, CoffeeScript, CSS and HTML
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* Based on https://github.com/chriskempson/tomorrow-theme
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* @author Rose Pritchard
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*/
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|
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|
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|
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|
|
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|
|
width: 3em; /* works for line-numbers below 1000 lines */
|
|
letter-spacing: -1px;
|
|
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|
|
|
|
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|
|
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|
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|
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|
|
|
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|
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|
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|
|
pointer-events: none;
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display: block;
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counter-increment: linenumber;
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}
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content: counter(linenumber);
|
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color: #999;
|
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display: block;
|
|
padding-right: 0.8em;
|
|
text-align: right;
|
|
}
|
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</style>
|
|
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|
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</head>
|
|
|
|
<body>
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|
|
|
<h1 id="toc_0">Software Methodology 11.15</h1>
|
|
|
|
<h2 id="toc_1">WangYuyang 19372316</h2>
|
|
|
|
<h2 id="toc_2">Design Pattern</h2>
|
|
|
|
<p>The design pattern I chose is the <strong>factory pattern</strong>. 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</p>
|
|
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|
<h2 id="toc_3">Class Diagram</h2>
|
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|
|
<p><img src="class-diagram.png" alt="class-diagram"></p>
|
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|
|
<h2 id="toc_4">Code</h2>
|
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|
<h3 id="toc_5">GradingScheme.java</h3>
|
|
|
|
<div><pre class="line-numbers"><code class="language-java">public interface GradingScheme {
|
|
public double getGrade(double assignment, double exam);
|
|
}</code></pre></div>
|
|
|
|
<h3 id="toc_6">GradingSchemeFactory.java</h3>
|
|
|
|
<div><pre class="line-numbers"><code class="language-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");
|
|
}
|
|
}</code></pre></div>
|
|
|
|
<h3 id="toc_7">MarkingAlgorithm.java</h3>
|
|
|
|
<div><pre class="line-numbers"><code class="language-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;
|
|
}
|
|
}
|
|
</code></pre></div>
|
|
|
|
<h3 id="toc_8">Student.java</h3>
|
|
|
|
<div><pre class="line-numbers"><code class="language-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;
|
|
}
|
|
}</code></pre></div>
|
|
|
|
<h3 id="toc_9">TestCase.java</h3>
|
|
|
|
<div><pre class="line-numbers"><code class="language-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());
|
|
|
|
}
|
|
|
|
}</code></pre></div>
|
|
|
|
<h2 id="toc_10">Output</h2>
|
|
|
|
<div><pre class="line-numbers"><code class="language-shell">Harry Potter 74.80000000000001
|
|
Harry Potter 77.0
|
|
</code></pre></div>
|
|
|
|
|
|
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