Question

Background: In Assignment 2, both the Bachelor and Master of Computer Science course structures are inputted manually inside the main () method. The students' enrolment records cannot be kept as well. In Lab 5, you are asked to modify the A2’s solution by using the object serialization and file I/O to import/export course objects and export the students' enrolment records to a text file. Tasks: Task 1: 1. Modify the existing Course, Subject and Major classes by implementing the serializable interface; 2. Create a new primary class (CreateCourse) without any class field; 3. Use the ObjectOutputStream class in the main () method of CreateCourse class to output the Bachelor of Computer Science course object to a binary file named bcs.ser (within the same directory as the CreateCourse.java) and the Master of Computer Science course object to a binary file named mcs.ser. You shall re-use the hardcode in A2's solution to create all subject, major and course objects first. Then use the writeObject () method to export the two course objects to two binary files, respectively.

Course,java

import java.util.ArrayList;

import java.util.Arrays;

/*

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* To change this template file, choose Tools | Templates

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*/

/**

*

* @author fenghui

*/

public class Course {

    private String cName;

    private ArrayList<Subject> cores;

    private ArrayList<Major> majors;

    private ArrayList<Subject> electives;

    private int cCredit;

    

    public Course(String n, int cc){

        cName = n;

        cCredit = cc;

        cores = new ArrayList<Subject>(0);

        majors = new ArrayList<Major>(0);

        electives = new ArrayList<Subject>(0);

    }

    

    public void addCores(Subject[] co){       

        cores.addAll(Arrays.asList(co));

    }

    

    public void addMajors(Major[] ma){

        majors.addAll(Arrays.asList(ma));

    }

    

    public void addElectives(Subject[] el){

        electives.addAll(Arrays.asList(el));

    }

    

    public ArrayList<Subject> getCores(){

        return cores;

    }

    

    public ArrayList<Subject> getElectives(){

        return electives;

    }

    

    public String toString(){

        String s="Course: ";

        

        s+=cName+"\n\n";

        

        s+="Cores: \n";

        for(Subject su:cores)

            s+=su;

        

        s+="\n";

        

        for(Major m:majors)

            s+=m;

        

        s+="Electives: \n";

        

        for(Subject su:electives)

            s+=su;

        

        return s;

    }

    

    public String getCName(){

        return cName;

    }

    

    public ArrayList<Major> getMajors(){

        return majors;

    }

    

    public int getCCredit(){

        return cCredit;

    }

}

Subject,java

/*

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/**

*

* @author fenghui

*/

public class Subject implements Cloneable{

    private String sName, code;

    private int credit;

    

    public Subject(String co, String name, int cr){

        sName = name;

        code = co;

        credit = cr;

    }

    

    public int getCredit(){

        return credit;

    }

    

    @Override

    public String toString(){

        return code+" ("+sName+", "+credit+"pt)\n";

    }

    

    public String getCode(){

        return code;

    }

    

    public boolean isSame(Subject s){

        if(s.getCode().equals(code))

            return true;

        else

            return false;

    }

    

    @Override

    public Subject clone() throws CloneNotSupportedException {

        return  (Subject) super.clone();

    }

}

Major.java

import java.util.ArrayList;

import java.util.Arrays;

public class Major implements Cloneable{

  private String mName;

  private ArrayList<Subject> mCores;

  

  

  public Major(){

      this("No Major");

  }

  

  public Major(String n){

      mName = n;

      mCores = new ArrayList<Subject>(0);

  }

  

  public void addMCores(Subject[] cores){

      mCores.addAll(Arrays.asList(cores));

  }

  

  public ArrayList<Subject> getMCores(){

      return mCores;

  }

  

  @Override

  public String toString(){

      String s="";

      

      s+=mName+" Major\n";

      

      for(Subject sub:mCores)

          s+= sub;

      

      s+="\n";

      return s;

  }

  

  public String getMName(){

      return mName;

  }

  

  public boolean isIncluded(Subject s){

      boolean b = false;

      

      for(Subject mc: mCores)

          b=b||mc.isSame(s);

      

      //System.out.println(mName+" includes "+ s.getCode()+": "+b);

      

      return b;

  }

  

  @Override

  public Major clone() throws CloneNotSupportedException {

      Major major = (Major) super.clone();

      major.mCores = (ArrayList<Subject>) mCores.clone();

        

      return major; //To change body of generated methods, choose Tools | Templates.

  }

}

public class Student {

private String stName, gender, DOB;

private int stNum;

public Student(String name, int num, String g, String dob){

stName=name;

stNum=num;

gender=g;

DOB=dob;}

public String toString(){

return "Student: "+stName+" ("+stNum+", "+gender+", "+DOB+") \n";}}

Answer 1

Java code and screen short of output shown below

Course.java

import java.util.ArrayList;

import java.util.Arrays;

/*

* To change this license header, choose License Headers in Project Properties.

* To change this template file, choose Tools | Templates

* and open the template in the editor.

*/

/**

*

* @author fenghui

*/
import java.io.*;
  

public class Course implements Serializable{

private String cName;

private ArrayList<Subject> cores;

private ArrayList<Major> majors;

private ArrayList<Subject> electives;

private int cCredit;

  

public Course(String n, int cc){

cName = n;

cCredit = cc;

cores = new ArrayList<Subject>(0);

majors = new ArrayList<Major>(0);

electives = new ArrayList<Subject>(0);

}

  

public void addCores(Subject[] co){   

cores.addAll(Arrays.asList(co));

}

  

public void addMajors(Major[] ma){

majors.addAll(Arrays.asList(ma));

}

  

public void addElectives(Subject[] el){

electives.addAll(Arrays.asList(el));

}

  

public ArrayList<Subject> getCores(){

return cores;

}

  

public ArrayList<Subject> getElectives(){

return electives;

}

  

public String toString(){

String s="Course: ";

  

s+=cName+"\n\n";

  

s+="Cores: \n";

for(Subject su:cores)

s+=su;

  

s+="\n Major:\n";

  

for(Major m:majors)

s+=m;

  

s+="\nElectives: \n";

  

for(Subject su:electives)

s+=su;

  

return s;

}

  

public String getCName(){

return cName;

}

  

public ArrayList<Major> getMajors(){

return majors;

}

  

public int getCCredit(){

return cCredit;

}

}

Subect.java

/*

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* To change this template file, choose Tools | Templates

* and open the template in the editor.

*/

/**

*

* @author fenghui

*/
import java.io.*;
  
public class Subject implements Cloneable,Serializable{

private String sName, code;

private int credit;

  

public Subject(String co, String name, int cr){

sName = name;

code = co;

credit = cr;

}

  

public int getCredit(){

return credit;

}

  

@Override

public String toString(){

return code+" ("+sName+", "+credit+"pt)\n";

}

  

public String getCode(){

return code;

}

  

public boolean isSame(Subject s){

if(s.getCode().equals(code))

return true;

else

return false;

}

  

@Override

public Subject clone() throws CloneNotSupportedException {

return (Subject) super.clone();

}

}

Major.java

import java.util.ArrayList;

import java.util.Arrays;
import java.io.*;

public class Major implements Cloneable,Serializable{

private String mName;

private ArrayList<Subject> mCores;

  

  

public Major(){

this("No Major");

}

  

public Major(String n){

mName = n;

mCores = new ArrayList<Subject>(0);

}

  

public void addMCores(Subject[] cores){

mCores.addAll(Arrays.asList(cores));

}

  

public ArrayList<Subject> getMCores(){

return mCores;

}

  

@Override

public String toString(){

String s="";

  

s+=mName+" \n";

  

for(Subject sub:mCores)

s+= sub;

  

s+="\n";

return s;

}

  

public String getMName(){

return mName;

}

  

public boolean isIncluded(Subject s){

boolean b = false;

  

for(Subject mc: mCores)

b=b||mc.isSame(s);

  

//System.out.println(mName+" includes "+ s.getCode()+": "+b);

  

return b;

}

  

@Override

public Major clone() throws CloneNotSupportedException {

Major major = (Major) super.clone();

major.mCores = (ArrayList<Subject>) mCores.clone();

  

return major; //To change body of generated methods, choose Tools | Templates.

}

}

Student.java

public class Student {

private String stName, gender, DOB;

private int stNum;

public Student(String name, int num, String g, String dob){

stName=name;

stNum=num;

gender=g;

DOB=dob;}

public String toString(){

return "Student: "+stName+" ("+stNum+", "+gender+", "+DOB+") \n";}}

CreateCourse.java

import java.io.*;
import java.util.ArrayList;
public class CreateCourse
{
public static void main(String[] args)
{
//same subject,major and elective in both courses
Subject[] obj1 = new Subject[2] ;   
obj1[0] = new Subject("001","Artificial Intelligence",10); //for core subject
obj1[1] = new Subject("001","Data Structure",10); //for elective   
Major[] obj2 = new Major[2] ;
obj2[0]=new Major("Robotics");
obj2[1]=new Major("Programming");
Course object1 = new Course("Bachelor of Computer Science", 5);
object1.addCores(obj1);
object1.addMajors(obj2);
object1.addElectives(obj1);
Course object2 = new Course("Master of Computer Science", 5);
object2.addCores(obj1);
object2.addMajors(obj2);
object2.addElectives(obj1);
String filename1 = "bcs.ser";
String filename2 = "mcs.ser";
// Serialization
try {
  
// Saving of object in a file
FileOutputStream file1 = new FileOutputStream
(filename1);
ObjectOutputStream out1 = new ObjectOutputStream
(file1);
FileOutputStream file2 = new FileOutputStream
(filename2);
ObjectOutputStream out2 = new ObjectOutputStream
(file2);
// Method for serialization of object
out1.writeObject(object1);
out2.writeObject(object2);
  
out1.close();
file1.close();
out2.close();
file2.close();
System.out.println("Object has been serialized\n"
+ object1);

System.out.println("Object has been serialized\n"
+ object2);

}
  
catch (IOException ex) {
System.out.println("IOException is caught");
}
}
  
}

output

Object has been serialized
Course: Bachelor of Computer Science

Cores:
001 (Artificial Intelligence, 10pt)
001 (Data Structure, 10pt)

Major:
Robotics

Programming

Electives:
001 (Artificial Intelligence, 10pt)
001 (Data Structure, 10pt)

Object has been serialized
Course: Master of Computer Science

Cores:
001 (Artificial Intelligence, 10pt)
001 (Data Structure, 10pt)

Major:
Robotics

Programming

Electives:
001 (Artificial Intelligence, 10pt)
001 (Data Structure, 10pt)

- х Bluel: Terminal Window - copyeven Options Object has been serialized Course: Bachelor of Computer Science Cores: 001 (Artificial Intelligence, 10pt) 001 (Data Structure, 10pt) Major: Robotics Programming Electives: 001 (Artificial Intelligence, 10pt) 001 (Data Structure, 10pt) Object has been serialized Course: Master of Computer Science Cores: 001 (Artificial Intelligence, 10pt) 001 (Data Structure, 10pt) Major: Robotics Programming Can only enter input while your programming is running Type here to search 3 7 () DENG 16:03 23-10-2020