Sw203 Lecture9 Encapsulation

Объект хандлагат програмчлалын хэл Java Хичээл : CS203 Багш : Д.Энхжаргал Mongolia University of Science & Technology Лекц: Encapsulation

Encapsulation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Encapsulation ,[object Object],[object Object],[object Object],Тухайн объектод шаардлагатай өгөгдлүүд Тухайн объект дээр хийгдэх үйлдлүүд Computer Processor speed RAM Use(); Buy();

Student_name, Salary, GPA, Course_number, Teacher_name, Student_code, Room_number … Method Choose_lesson, Give_lecture, Pay_payment Do_homework Get_salary … Data En capsul ation (1- Нэгтгэх ) Object 1 Data Method Object 2 Data Method Object 3 Data Method

STUDENT TEACHER Student_code Student_name GPA Course_number Teacher_name Salary Room_number Choose_lesson Pay_payment Do_homework Give_lecture Get_salary Encapsulation ( 2- Далдлах ) ,[object Object]

Объектын бие даасан байдал Тухайн объектод шаардлагатай өгөгдлүүд Тухайн объект дээр хийгдэх үйлдлүүд ,[object Object],[object Object],[object Object],Computer Processor speed RAM Use(); Buy();

Объектын бие даасан байдал буюу өөрийгөө боловсруулах чадвар Улс Арьс шир Мал Мод Газрын баялаг … ГазрынБаялагБоловсруулах () ТүүхийЭдБоловсруулах () БайгалийнБаялагБоловсруулах () ТусгаарТогтнох () … Жишээ нь:

Уламжлалт аргачлал Объект хандлагат аргачлал Гадаад холбоо хүчтэй дотоод холбоо сул байх зарчим

Уламжлалт аргачлал Объект хандлагат аргачлал Нэгтгэхэд т¿вэгтэй Нэгтгэхэд хялбар Encapsulation: Гадаад холбоо хүчтэй дотоод холбоо сул байх зарчим

Encapsulation ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],Encapsulation

Нэмэлт уншилга Дараах жишээ кодонд хэрэгжүүлсэн бидний хараахан үзээгүй шинэ ойлголтуудад тухай бүрт нь товч тодорхой тайлбар хийсэн. Гол нь энэхүү жишээ кодоор Encapsulation хэмээх ойлголт нь програмын тогтвортой байдлыг хэрхэн хангадагийг харуулахыг зорьсон болно.

Encapsulation - Жишээ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Encapsulation - Жишээ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],public interface CourseReporter { void setOutputPath (String path); void setTitle (String title); void generateReport (List students) throws IOException; }

Encapsulation - Жишээ ,[object Object],public class ReportTestClass { // тестлэх өгөгдлүүд .. private static School testSchool ; private static Course sw201 = new ProgrammingCourse("SW201", "Introduction to Algorithm", 3); private static Course sw202 = new ProgrammingCourse("SW202", "Introduction to Programming", 3); private static Course sw203 = new ProgrammingCourse("SW203", "Object-oriented Programming", 3); private static Course sw204 = new ProgrammingCourse("SW204", "Data Structure", 3); private static Course sw305 = new ProgrammingCourse("SW305", "Collaborative Team Programming", 3); private static Course sw503 = new ProgrammingCourse("SW503", "Project Management", 3); private static Course sw508 = new ProgrammingCourse("SW508", "Object-oriented Analysis and Design", 3); private static Course sw511 = new ProgrammingCourse("SW511", "E-business Programming", 3); private static Course ma201 = new MathCourse("MA201", "Algebra I", 3); private static Course ma202 = new MathCourse("MA202", "Algebra II", 3); private static Course ma203 = new MathCourse("MA203", "Trigonometry", 3); private static Course ma204 = new MathCourse("MA204", "Finite Mathematics",3); private static Course ma205 = new MathCourse("MA205", "Calculus I", 3); private static Course ma206 = new MathCourse("MA206", "Calculus II", 3); // Үргэлжлэл нь дараагийн хуудсанд

Encapsulation - Жишээ ,[object Object],// Өмнөх хуудсын үргэлжлэл private static Course en101 = new LanguageCourse("EN101", "English I", 4); private static Course en201 = new LanguageCourse("EN201", "English II", 4); private static Course en301 = new LanguageCourse("EN301", "Writing English I", 4); private static Course en302 = new LanguageCourse("EN302", "Writing English II", 4); private static Course en501 = new LanguageCourse("EN501", "Business English", 4); private static Course en502 = new LanguageCourse("EN502", "Advanced English", 4); private static Course en503 = new LanguageCourse("EN503", "Technical English", 4); private static Student createStudent (String name, String id, School school) { Student s1 = new BachelorStudent(); s1.setName(name); s1.setId(id); s1.setSchool(school); return s1; } private static Grade createGrade (Course course) { return new Grade("Fall", 2006, course); } public static void main (String[] args) throws Throwable { // Үргэлжлэл нь дараагийн хуудсанд

Encapsulation - Жишээ ,[object Object],// Өмнөх хуудсын үргэлжлэл // school объект үүсгэх testSchool = new School(); testSchool.setName("KTMC"); testSchool.setAddress("Sansar, Ulaanbaatar, Mongolia"); // create test student objects... Student s1 = createStudent("John Smith", "SW03E001", testSchool); s1.setGrades(new Grade[]{createGrade(sw201), createGrade(ma201), createGrade(en101)}); Student s2 = createStudent("James Baker", "SW02E109", testSchool); s2.setGrades(new Grade[]{createGrade(sw204), createGrade(sw305), createGrade(ma202), createGrade(ma203), createGrade(ma204), createGrade(en201)}); Student s3 = createStudent("Jonna Simpson", "IM04E401", testSchool); s3.setGrades(new Grade[]{createGrade(sw305), createGrade(sw204), createGrade(sw203), createGrade(ma202), createGrade(ma203), createGrade(ma205), createGrade(en201), createGrade(en301)}); // үргэлжлэл дараагийн хуудсанд

Encapsulation - Жишээ ,[object Object],// Өмнөх хуудсын үргэлжлэл Student s4 = createStudent("Jimmy Bubba", "SW02F059", testSchool); s4.setGrades(new Grade[]{createGrade(sw503), createGrade(sw508), createGrade(sw511), createGrade(en501), createGrade(en502), createGrade(en503)}); Student s5 = createStudent("Jenny Kursten", "MG02E002", testSchool); s5.setGrades(new Grade[]{createGrade(ma205), createGrade(ma206), createGrade(en501), createGrade(en502), createGrade(en503)}); Student s6 = createStudent("Jamison Lincohn", "MG02E108", testSchool); s6.setGrades(new Grade[]{createGrade(sw503), createGrade(ma204), createGrade(ma205), createGrade(ma206), createGrade(en501), createGrade(en502)}); Student s7 = createStudent("Joni Blanc", "IM03G013", testSchool); s7.setGrades(new Grade[]{createGrade(sw305), createGrade(sw503), createGrade(ma206), createGrade(en501), createGrade(en503)}); // Үргэлжлэл дараагийн хуудсанд

Encapsulation - Жишээ ,[object Object],// Өмнөх хуудсын үргэлжлэл Student s8 = createStudent("Jake Hound", "IM03M117", testSchool); s8.setGrades(new Grade[]{createGrade(sw203), createGrade(sw204), createGrade(sw305), createGrade(ma201), createGrade(ma202), createGrade(ma203), createGrade(en101), createGrade(en301)}); Student s9 = createStudent("Jeremy Kim", "SW04E096", testSchool); s9.setGrades(new Grade[]{createGrade(sw202), createGrade(ma202), createGrade(ma203), createGrade(en201), createGrade(en302)}); Student s10 = createStudent("Jessica Jewels", "MG05E110", testSchool); s10.setGrades(new Grade[]{createGrade(sw203), createGrade(sw204), createGrade(sw305), createGrade(ma204), createGrade(ma205), createGrade(en301), createGrade(en501)}); // тайлан гаргах зорилгоор оюутан классын объектуудыг жагсаалтад нэмэх List students = new ArrayList(); students.add(s1); students.add(s2); students.add(s3); students.add(s4); students.add(s5); students.add(s6); students.add(s7); students.add(s8); students.add(s9); students.add(s10); // Үргэлжлэл дараагийн хуудсанд

Encapsulation - Жишээ ,[object Object],// Өмнөх хуудсын үргэлжлэл // тайлан объект үүсгэх CourseReporter reporter = new CourseTextReporter(); // Тайлангийн толгой болон байрлах байрлалыг тогтоох reporter.setOutputPath("c:/temp"); reporter.setTitle("Fall 2006 Course Registration"); // Тайлан гаргах reporter.generateReport(students); } } // үргэлжлэл дараагийн хуудсанд

Encapsulation - Жишээ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Encapsulation - Жишээ ,[object Object],public class CourseTextReporter implements CourseReporter { private String outputPath; private String title; public void setOutputPath (String outputPath) { this.outputPath = outputPath; } public void setTitle (String title) { this.title = title; } public void generateReport (List students) throws IOException { StringBuffer buffer = new StringBuffer(); buffer.append("=================================================="); buffer.append(title).append(""); buffer.append("=================================================="); buffer.append("==Course Report==================================="); // Үргэлжлэл нь дараагийн хуудсанд

Encapsulation - Жишээ ,[object Object],// Өмнөх хуудсын үргэлжлэл if (students == null || students.isEmpty()) { buffer.append("No students currently registered."); } else { for (int i = 0; i < students.size(); i++) { Student student = (Student) students.get(i); buffer.append("----------------------------------------").append( student.getId()).append("--"); buffer.append(" Name: ").append(student.getName()).append(""); buffer.append(" Courses: "); Grade[] grades = student.getGrades(); for (int j = 0; j < grades.length; j++) { Grade grade = grades[j]; if (j != 0) { buffer.append(" "); } buffer.append(grade.getCourse().getCode()).append(" - ").append( grade.getCourse().getName()); buffer.append(""); } buffer.append(".................................................."); } } buffer.append("==End of Report==================================="); FileOutputStream fos = new FileOutputStream(outputPath + "/report.txt"); fos.write(buffer.toString().getBytes()); fos.close(); } }

Encapsulation - Жишээ ,[object Object],================================================== Fall 2006 Course Registration ================================================== ==Course Report=================================== ----------------------------------------SW03E001-- Name: John Smith Courses: SW201 - Introduction to Algorithm MA201 - Algebra I EN101 - English I .................................................. ----------------------------------------SW02E109-- Name: James Baker Courses: SW204 - Data Structure SW305 - Collaborative Team Programming MA202 - Algebra II MA203 - Trigonometry MA204 - Finite Mathematics EN201 - English II .................................................. ----------------------------------------IM04E401-- Name: Jonna Simpson Courses: SW305 - Collaborative Team Programming SW204 - Data Structure SW203 - Object-oriented Programming MA202 - Algebra II MA203 - Trigonometry MA205 - Calculus I EN201 - English II EN301 - Writing English I .................................................. ----------------------------------------SW02F059-- Name: Jimmy Bubba Courses: SW503 - Project Management SW508 - Object-oriented Analysis and Design SW511 - E-business Programming EN501 - Business English ... ... ... ... ... ... ----------------------------------------SW04E096-- Name: Jeremy Kim Courses: SW202 - Introduction to Programming MA202 - Algebra II MA203 - Trigonometry EN201 - English II EN302 - Writing English II .................................................. ----------------------------------------MG05E110-- Name: Jessica Jewels Courses: SW203 - Object-oriented Programming SW204 - Data Structure SW305 - Collaborative Team Programming MA204 - Finite Mathematics MA205 - Calculus I EN301 - Writing English I EN501 - Business English .................................................. ==End of Report===================================

Encapsulation - Жишээ ,[object Object],public class CourseCsvReporter implements CourseReporter { private String outputPath; private String title; public void setOutputPath (String outputPath) { this.outputPath = outputPath; } public void setTitle (String title) { this.title = title; } public void generateReport (List students) throws IOException { StringBuffer buffer = new StringBuffer(); buffer.append(title).append(""); // column header buffer.append("student_id,student_name,"); buffer.append("course1_code,course1_name,"); buffer.append("course2_code,course2_name,"); buffer.append("course3_code,course3_name,"); buffer.append("course4_code,course4_name,"); buffer.append("course5_code,course5_name,"); buffer.append("course6_code,course6_name,"); buffer.append("course7_code,course7_name,"); buffer.append("course8_code,course8_name,"); buffer.append("course9_code,course9_name,"); buffer.append("course10_code,course10_name"); buffer.append(""); // Үргэлжлэл дараагийн хуудсанд

Encapsulation - Жишээ ,[object Object],// Өмнөх хуудсын үргэлжлэл if (students == null || students.isEmpty()) { buffer.append("No students currently registered."); } else { for (int i = 0; i < students.size(); i++) { Student student = (Student) students.get(i); buffer.append(student.getId()).append(","); buffer.append(student.getName()).append(","); Grade[] grades = student.getGrades(); for (int j = 0; j < 10; j++) { // maximum 10 courses per student if (j >= grades.length) { buffer.append(",,"); } else { Grade grade = grades[j]; buffer.append(grade.getCourse().getCode()).append(","); buffer.append(grade.getCourse().getName()).append(","); } } buffer.append(""); } } FileOutputStream fos = new FileOutputStream(outputPath + "/report.csv"); fos.write(buffer.toString().getBytes()); fos.close(); } }

Encapsulation - Жишээ ,[object Object]

Encapsulation - Жишээ ,[object Object],public class CourseHtmlReporter implements CourseReporter { private String outputPath; private String title; public void setOutputPath (String outputPath) { this.outputPath = outputPath; } public void setTitle (String title) { this.title = title; } public void generateReport (List students) throws IOException { StringBuffer buffer = new StringBuffer(); buffer.append("<html>"); buffer.append("<head>"); buffer.append("<title>").append(title).append("</title>"); buffer.append( "<link rel='stylesheet' type='text/css' media='all' href='style.css'/>"); buffer.append("</head>"); buffer.append("<body>"); buffer.append("<h1>").append(title).append("</h1>"); buffer.append("<h2>Course Report</h2>"); buffer.append("<hr>"); // Үргэлжлэл дараагийн хуудсанд

Encapsulation - Жишээ ,[object Object],// Өмнөх хуудсын үргэлжлэл if (students == null || students.isEmpty()) { buffer.append( "<center><div class='no_student'>No students currently registered.</div></center>"); } else { buffer.append("<div style='report'><center>"); for (int i = 0; i < students.size(); i++) { Student student = (Student) students.get(i); buffer.append("<table border='1'>"); buffer.append("<tr>"); buffer.append("<th>").append(student.getId()).append("</th>"); buffer.append("<td>").append(student.getName()).append("</td>"); buffer.append("</tr>"); buffer.append("<tr>"); buffer.append("<td colspan='2'>"); buffer.append("<table border='0' class='courses'>"); Grade[] grades = student.getGrades(); for (int j = 0; j < grades.length; j++) { Course course = grades[j].getCourse(); buffer.append("<tr>"); buffer.append("<th>").append(course.getCode()).append("</th>"); buffer.append("<td>").append(course.getName()).append("</td>"); buffer.append("</tr>"); } // Үргэлжлэл дараагийн хуудсанд

Encapsulation - Жишээ ,[object Object],// Өмнөх хуудсын үр дүн buffer.append("</table>"); buffer.append("</td>"); buffer.append("</tr>"); buffer.append("</table"); } buffer.append("</center></div>"); } buffer.append("<hr>"); buffer.append("<br>"); // add footer Date currentDate = new Date(); DateFormat format = new SimpleDateFormat("yyyy.MM.dd hh:mm:ss"); String rightNow = format.format(currentDate); buffer.append( "<div class='footer'>Powered by SW203 Report Generator - Generated on "); buffer.append(rightNow); buffer.append("</div>"); buffer.append("<br>"); buffer.append("</body>"); buffer.append("</html>"); FileOutputStream fos = new FileOutputStream(outputPath + "/report.html"); fos.write(buffer.toString().getBytes()); fos.close(); } }

Sw203 Lecture9 Encapsulation

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