Question

PLEASE DO IN JAVA

3) Add the following method to College: 1. sort(): moves all students to the first positions of the array, and all faculties after that. As an example, let fn indicate faculty n and sn indicate student n. If the array contains s1|f1|f2|s2|s3|f3|s4, after invoking sort the array will contain s1|s2|s3|s4|f1|f2|f3 (this does not have to be done “in place”). Students and faculty are sorted by last name. You can use any number of auxiliary (private) methods, if needed.

4) Add a method storeCollege(String filename) to College. This method saves all the college information in a file (name specified in variable filename). Use ObjectOutputStream and write one single object. Add method loadStoreCollege(String filename) which loads the information written by storeCollege.

5) Add the program’s main method to College. The main method instantiates a new College, adds some faculty and students in random order (populated with their name and ID), sorts them using the code in Part 3, and stores them into a file. It then instantiates a new college that loads the data previously written to file, and verifies that the first and second college contain identical data. The main method does not ask for any input from the terminal.

PLEASE DO IN JAVA... BASED ON PREVIOUS QUESTION WHERE PARTS 1 AND 2 WERE ANSWERED

3) Add the following method to College: 1. sort(): moves all students to the first positions of the array, and all faculties after that. As an example, let fn indicate faculty n and sn indicate student n. If the array contains s1|f1|f2|s2|s3|f3|s4, after invoking sort the array will contain s1|s2|s3|s4|f1|f2|f3 (this does not have to be done “in place”). Students and faculty are sorted by last name. You can use any number of auxiliary (private) methods, if needed.

4) Add a method storeCollege(String filename) to College. This method saves all the college information in a file (name specified in variable filename). Use ObjectOutputStream and write one single object. Add method loadStoreCollege(String filename) which loads the information written by storeCollege.

5) Add the program’s main method to College. The main method instantiates a new College, adds some faculty and students in random order (populated with their name and ID), sorts them using the code in Part 3, and stores them into a file. It then instantiates a new college that loads the data previously written to file, and verifies that the first and second college contain identical data. The main method does not ask for any input from the terminal.

// Part 1

public interface Person {
  
    public void setName(String name);
    public String getName();

    public void setID(String id);
    public String getID();
}

public class Student implements Person {

    private String name;

    private String studentID;

    private double GPA;

    public Student() {

        name = "";

        studentID = "";

        GPA = 0;

    }

    public Student(String name, String studentID) {

        this.name = name;

        this.studentID = studentID;

    }

    public Student(String name, String studentID, double GPA) {

        this.name = name;

        this.studentID = studentID;

        this.GPA = GPA;

    }

    public double getGPA() {

        return GPA;

    }

    public void setGPA(double GPA) {

        this.GPA = GPA;

    }

    @Override

    public void setName(String name) {

        this.name = name;

    }

    @Override

    public String getName() {

        return name;

    }

    @Override

    public void setID(String id) {

        this.studentID = id;

    }

    @Override

    public String getID() {

        return studentID;

    }

}
public class Faculty implements Person {

    private String name;

    private String facultyID;

    private String department;

    public Faculty() {

        name = "";

        facultyID = "";

        department = "";

    }

    public Faculty(String name, String studentID) {

        this.name = name;

        this.facultyID = studentID;

    }

    public Faculty(String name, String studentID, String department) {

        this.name = name;

        this.facultyID = studentID;

        this.department = department;

    }

    public String getDepartment() {

        return department;

    }

    public void setDepartment(String department) {

        this.department = department;

    }

    @Override

    public void setName(String name) {

        this.name = name;

    }

    @Override

    public String getName() {

        return name;

    }

    @Override

    public void setID(String id) {

        this.facultyID = id;

    }

    @Override

    public String getID() {

        return facultyID;

    }

}
// Part 2

public class College {

    private String collegeName;

    private Person persons[];

    private int count;

    public College(String collegeName) {

        this.collegeName = collegeName;

        persons = new Person[100];

        count = 0;

    }

    public void addPerson(Person aPerson) {

        if (count < persons.length) {

            persons[count++] = aPerson;

        }

    }

    public String getName() {

        return collegeName;

    }

    public void setName(String collegeName) {

        this.collegeName = collegeName;

    }

}

Answer 1

Given below is the code for the question. Please do rate the answer if it helped. Thank you.

Student.java
=====
import java.io.Serializable;

// Part 1

public class Student implements Person, Serializable {

private String name;

private String studentID;

private double GPA;

public Student() {

name = "";

studentID = "";

GPA = 0;

}

public Student(String name, String studentID) {

this.name = name;

this.studentID = studentID;

}

public Student(String name, String studentID, double GPA) {

this.name = name;

this.studentID = studentID;

this.GPA = GPA;

}

public double getGPA() {

return GPA;

}

public void setGPA(double GPA) {

this.GPA = GPA;

}

@Override

public void setName(String name) {

this.name = name;

}

@Override

public String getName() {

return name;

}

@Override

public void setID(String id) {

this.studentID = id;

}

@Override

public String getID() {

return studentID;

}
  
@Override
public String toString() {
   return "Student id = " + getID() + ", name = " + getName() + ", gpa = " + getGPA();
}

}

Faculty.java
=====
import java.io.Serializable;

public class Faculty implements Person, Serializable{

private String name;

private String facultyID;

private String department;

public Faculty() {

name = "";

facultyID = "";

department = "";

}

public Faculty(String name, String studentID) {

this.name = name;

this.facultyID = studentID;

}

public Faculty(String name, String studentID, String department) {

this.name = name;

this.facultyID = studentID;

this.department = department;

}

public String getDepartment() {

return department;

}

public void setDepartment(String department) {

this.department = department;

}

@Override

public void setName(String name) {

this.name = name;

}

@Override

public String getName() {

return name;

}

@Override

public void setID(String id) {

this.facultyID = id;

}

@Override

public String getID() {

return facultyID;

}
  
@Override
public String toString() {
   return "Faculty id = " + getID() + ", name = " + getName() + ", department = " + getDepartment();
}

}

College.java
======
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class College implements Serializable{

private String collegeName;

private Person persons[];

private int count;

public College(String collegeName) {

this.collegeName = collegeName;

persons = new Person[100];

count = 0;

}

public void addPerson(Person aPerson) {

if (count < persons.length) {

persons[count++] = aPerson;

}

}

public String getName() {

return collegeName;

}

public void setName(String collegeName) {

this.collegeName = collegeName;

}
  
public void sort() {
   int min;
   Person temp;
   for(int i = 0 ;i < count; i++) {
       min = i;
       for(int j = i+1; j < count; j++) {
           if(compare(persons[j], persons[min]) < 0)
               min = j;
       }
      
       temp = persons[i];
       persons[i] = persons[min];
       persons[min] = temp;
   }
}

private int compare(Person p1, Person p2) {
   if(p1 instanceof Student && p2 instanceof Student) {
       return ((Student)p1).getName().compareTo(((Student)p2).getName());
   }
   else if(p1 instanceof Faculty && p2 instanceof Faculty) {
       return ((Faculty)p1).getName().compareTo(((Faculty)p2).getName());
   }
   else if(p1 instanceof Student)
       return -1;
   else
       return 1;
}
  
  
public void storeCollege(String filename) {
   try {
           ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(filename));
           oos.writeObject(this);
           oos.close();
       } catch (Exception e) {
           System.out.println(e.getMessage());
       }
}
  
  
public void loadCollege(String filename) {
   try {
       ObjectInputStream ois = new ObjectInputStream(new FileInputStream(filename));
           College c = (College)   ois.readObject();
           ois.close();
           this.collegeName = c.collegeName;
           this.count = c.count;
           this.persons = c.persons;
       } catch (Exception e) {
           System.out.println(e.getMessage());
       }
}
  
  
@Override
public String toString() {
   String s = "College: " + getName() + "\n" + "Count = " + count + "\n";
          
   for(int i = 0; i < count; i++)
       s += persons[i] + "\n";
   return s;
  
}
  
public static void main(String[] args) {
       Student s1 = new Student("John", "111", 3.5);
       Student s2 = new Student("Bill", "222", 3.1);
       Student s3 = new Student("Christina", "333", 3.9);

       Faculty f1 = new Faculty("Josh", "567", "CSC");
       Faculty f2 = new Faculty("Bob", "345", "Math");
       Faculty f3 = new Faculty("Thomas" , "234", "Physics");
      
       College c1 = new College("ABC College");
       c1.addPerson(s1);
       c1.addPerson(f1);
       c1.addPerson(f2);
       c1.addPerson(s2);
       c1.addPerson(f3);
       c1.addPerson(s3);
      
       System.out.println("Before sorting");
       System.out.println(c1);
       c1.sort();
       System.out.println("After sorting");
       System.out.println(c1);
      
      
       System.out.println("Storing college object c1 into file college.bin");
       c1.storeCollege("college.bin");
      
      
       College c2 = new College("");
       System.out.println("Reading college object from file college.bin into c2");
       c2.loadCollege("college.bin");
      
       System.out.println("college object loaded from file is \n" + c2);
}
      
}

output
===
Before sorting
College: ABC College
Count = 6
Student id = 111, name = John, gpa = 3.5
Faculty id = 567, name = Josh, department = CSC
Faculty id = 345, name = Bob, department = Math
Student id = 222, name = Bill, gpa = 3.1
Faculty id = 234, name = Thomas, department = Physics
Student id = 333, name = Christina, gpa = 3.9

After sorting
College: ABC College
Count = 6
Student id = 222, name = Bill, gpa = 3.1
Student id = 333, name = Christina, gpa = 3.9
Student id = 111, name = John, gpa = 3.5
Faculty id = 345, name = Bob, department = Math
Faculty id = 567, name = Josh, department = CSC
Faculty id = 234, name = Thomas, department = Physics

Storing college object c1 into file college.bin
Reading college object from file college.bin into c2
college object loaded from file is
College: ABC College
Count = 6
Student id = 222, name = Bill, gpa = 3.1
Student id = 333, name = Christina, gpa = 3.9
Student id = 111, name = John, gpa = 3.5
Faculty id = 345, name = Bob, department = Math
Faculty id = 567, name = Josh, department = CSC
Faculty id = 234, name = Thomas, department = Physics