#archap 1 * LectureNotes. +LectureNotes(in title : String, in n : int, in coursename : String)

Transcription

1 King Saud University College of Computer and Information Sciences Department of Computer Science CSC113 Computer Programming II Midterm 2 Exam Spring 2018 Exercise1: «interface» CourseMaterial +displaymaterial() +printmaterial() -title : String Document +Document(in title : String, in n : int) +getdocsize() : double +getdocnbpages() : int #archap 1 * Chapter -title : String -nbpages : int -size : double +Chapter(in title : String, in nbpages : int, in size : double) +gettitle() : String +getsize() : double +getnbpages() : int +display() +print() -editor : String TextBook +TextBook(in title : String, in n : int, in editor : String) +geteditor() : String -coursename : String LectureNotes +LectureNotes(in title : String, in n : int, in coursename : String) Class Chapter : title: the title of the chapter. nbpages: the number of pages of the chapter. size: the size in kilo-bytes of the chapter. Chapter(title: String, nbpages: int, size: double): constructor. gettitle(), getsize() and getnbpages() : getters. display(): this method displays all attributes of the chapter. print(): this method prints the chapter.

2 Interface CourseMaterial : displaymaterial(): this method displays all the attributes of the Document (TextBook or LectureNotes) as well as its chapters. printmaterial(): this method prints the chapters of the Document as follows: o For Text Books, it prints the chapter entitled Introduction only. o For Lecture Notes, it prints all chapters. Class Document : title: the title of the document. Document(title: String, n: int): constructor. The parameter n defines the maximum number of chapters of the Document. getdocsize(): this method returns the total size of all chapters of the Document. getdocnbpages(): this method returns the total number of pages of all chapters of the Document. Class TextBook : editor: the editor name of the textbook. TextBook(title: String, n: int, editor: String): constructor. geteditor(): getter. QUESTION: Translate into Java code: 1. The interface CourseMaterial, 2. the class Document and 3. the class TextBook. 2

3 public interface CourseMaterial { public void displaymaterial(); public void printmaterial();./3 public abstract class Document implements CourseMaterial { +1./17 private String title; protected Chapter archap[]; protected int nbchap; public Document(String t,int n) {./2 title = t; archap = new Chapter[n]; nbchap = 0; public void displaymaterial(){./3 System.out.println(title); for (int i = 0; i < nbchap; i++) archap[i].display(); public double getdocsize() {./4 double totalsize = 0.0; for (int i = 0; i < nbchap; i++) totalsize += archap[i].getsize(); return totalsize; public int getdocnbpages() {./4 int totalnbp = 0; for (int i = 0; i < nbchap; i++) totalnbp += archap[i].getnbpages(); return totalnbp; public class TextBook extends Document { private String editor; public TextBook(String t,int n, String e) { super(t, n); editor = e; 0./2 public void displaymaterial() {./2 super.displaymaterial(); System.out.println(editor); public void printmaterial() {./4 for (int i = 0; i < nbchap; i++) { if (archap[i].gettitle().equals("introduction")) { archap[i].print(); return;./1 3

4 public String geteditor() { return editor; 4

5 Exercise 2: Let s consider the same class Document described in exercise 1. «interface» CourseMaterial +displaymaterial() +printmaterial() FolderEx2 -name : string -path : String +FolderEx2(in name : String, in path : String, in size : int) +largesttextbook() : Document +avgtextbooksize(in e : String) : Double -arrdoc 1 * -title : String Document +Document(in title : String, in n : int) +getdocsize() : double +getdocnbpages() : int Class FolderEx2: name: the name of the folder. path: the path of the folder. FolderEx2 (name: String, path: String, size: int): constructor. The parameter size defines the maximum number of documents in the folder. largesttextbook(): this method returns the Document of type TextBook having the largest total number of pages. avgtextbooksize( e: String): this method returns the average Document size of all TextBooks edited by the editor e. QUESTION: Translate into Java code the class FolderEx2. 5

6 public class FolderEx2 {./21 private String name; private String path; private Document ardoc[]; private int nbdoc; public FolderEx2(String s, String p, int size) { name = s; path = p;./2 ardoc = new Document[size]; nbdoc = 0; public Document largesttextbook() { Document res = null;./7 for (int i = 0; i < nbdoc; i++) { if (ardoc[i] instanceof TextBook) { if (res == null ardoc[i].getdocnbpages()>res.getdocnbpages())./1 res = ardoc[i]; return res; public double avgtextbooksize(string e) { double total = 0.0; int nb = 0; 1 for (int i = 0; i < nbdoc; i++) { if ( ardoc[i] instanceof TextBook && ((TextBook) ardoc[i]).geteditor().equals(e)) { /1+1 nb ++; total += ardoc[i].getdocsize(); if (nb > 0) return total / nb; else return 0.0; 6

7 Exercise 3: Let s consider the same class Document described in exercise 1. «interface» CourseMaterial +displaymaterial() +printmaterial() * FolderEx3 -name : string -path : String +FolderEx3(in name : String, in path : String, in size : int) +display() +getfolderlsize() : double -subfolders 1 -arrdoc 1 * -title : String Document +Document(in title : String, in n : int) +getdocsize() : double +getdocnbpages() : int Class FolderEx3: name: the name of the folder. path: the path of the folder. FolderEx3 (name: String, path: String, size: int): constructor. The parameter size defines the maximum number of documents in the folder. display(): this method displays both; all documents and subfolders of the folder. getfoldersize(): this method returns the total size of the folder calculated as follows: Total size of the folder = size _ of _ Documents size _ of _ subfolders QUESTION: Translate into Java code the class FolderEx3. 7

8 public class FolderEx3 { 9 private String name; private String path; private Document ardoc[]; private int nbdoc; private FolderEx3 subfolders[]; private int nbsubfolders; public FolderEx3(String s, String p, int size) { name = s; path = p;./4 ardoc = new Document[size]; nbdoc = 0; subfolders = new FolderEx3[10]; nbsubfolders = 0; public void display() { Document res = null;./5 for (int i = 0; i < nbdoc; i++) { ardoc[i].displaymaterial(); for (int i = 0; i < nbsubfolders; i++) { subfolders[i].display(); public double getfoldersize() { double totals = 0.0;./6 for (int i = 0; i < nbdoc; i++) { totals += ardoc[i].getdocsize(); for (int i = 0; i < nbsubfolders; i++) { totals += subfolders[i].getfoldersize(); return totals; 8