Question

I. General Description In this assignment, you will create a Java program to read undergraduate and graduate students from an input file, sort them, and write them to an output file. This assignment is a follow up of assignment 5. Like assignment 5, your program will read from an input file and write to an output file. The input file name and the output file name are passed in as the first and second arguments at command line, respectively. Unlike assignment 5, the Student objects are sorted before they are written to the output file.

• The program must implement a main class, three student classes (Student, UndergradStudent, GradStudent), and a Comparator class called StudentIDComparator.

• The StudentIDComparator class must implement the java.util.Comparator interface, and override the compare() method. Since the Comparator interface is a generic interface, you must specify Student as the concrete type. The signature of the compare method should be public int compare(Student s1, Student s2). The compare() method returns a negative, 0, or positive value if s1 is less than, equals, or is greater than s2, respectively. • To sort the ArrayList, you need to create a StudentIDComparator object and use it in the Collections’ sort method: StudentIDComparator idSorter = new StudentIDComparator(); Collections.sort(students, idSorter); //students is an arrayList of Students

heres students.txt

James Bond,200304,3.2,undergraduate,true
Michelle Chang,200224,3.3,graduate,Cleveland State University
Tayer Smoke,249843,2.4,undergraduate,false
David Jones,265334,2.7,undergraduate,true
Abby Wasch,294830,3.6,graduate,West Virginia
Nancy Drew,244833,2.9,graduate,Case Western
Lady Gaga,230940,3.1,undergraduate,false
Sam Jackson,215443,3.9,graduate,Ohio State University

Answer 1

Please find the answer below.
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StudentTest.java

package c15;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Scanner;

class Student{
   private String name;
   private int ID;
   private double marks;

   public Student(String name, int iD, double marks) {
       super();
       this.name = name;
       ID = iD;
       this.marks = marks;
   }

   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public int getID() {
       return ID;
   }
   public void setID(int iD) {
       ID = iD;
   }
   public double getMarks() {
       return marks;
   }
   public void setMarks(double marks) {
       this.marks = marks;
   }
}

class UndergradStudent extends Student{
   private String status;
   private String isUnderGraduate;

   public UndergradStudent(String name, int iD, double marks,String s,String s2) {
       super(name,iD,marks);
       this.status = s;
       this.isUnderGraduate = s2;
   }

   public UndergradStudent(String array[]) {
       super(array[0],Integer.parseInt(array[1]),Double.parseDouble(array[2]));
       this.status = array[3];
       this.isUnderGraduate = array[4];
   }

   public String getStatus() {
       return status;
   }

   public void setStatus(String status) {
       this.status = status;
   }

   public String getIsUnderGraduate() {
       return isUnderGraduate;
   }

   public void setIsUnderGraduate(String isUnderGraduate) {
       this.isUnderGraduate = isUnderGraduate;
   }
  
}

class GradStudent extends Student{
   private String status;
   private String clg;

   public GradStudent(String name, int iD, double marks,String s,String s2) {
       super(name,iD,marks);
       this.status = s;
       this.clg = s2;
   }

   public GradStudent(String array[]) {
       super(array[0],Integer.parseInt(array[1]),Double.parseDouble(array[2]));
       this.status = array[3];
       this.clg = array[4];
   }

   public String getStatus() {
       return status;
   }

   public void setStatus(String status) {
       this.status = status;
   }

   public String getClg() {
       return clg;
   }

   public void setClg(String clg) {
       this.clg = clg;
   }
  
}

class StudentIDComparator implements Comparator<Student> {
   @Override
   public int compare(Student o1, Student o2) {
       if(o1.getID()>o2.getID()) {
           return 1;
       }else if(o1.getID()<o2.getID()) {
           return -1;
       }
       return 0;
   }
}

public class StudentTest {
   public static void main(String[] args) {
       File file = new File("student.txt"); //reading data from this file
       Scanner reader;
       String line="";
       try {
           //read file using scanner
           reader = new Scanner(file);
           ArrayList<UndergradStudent> undergraduateStudent = new ArrayList<UndergradStudent>();
           ArrayList<GradStudent> graduateStudent = new ArrayList<GradStudent>();
           while(reader.hasNextLine()){
               //read line
               line = reader.nextLine();
               String data[] = line.split(",");
               if(data[3].equalsIgnoreCase("graduate")) {
                   graduateStudent.add(new GradStudent(data));
               }else {
                   undergraduateStudent.add(new UndergradStudent(data));
               }
           }
           System.out.println("Successfully loaded "+graduateStudent.size()+" Graduate records.");
           System.out.println("Successfully loaded "+undergraduateStudent.size()+" Under Graduate records.");
          
           StudentIDComparator idSorter = new StudentIDComparator();
           Collections.sort(undergraduateStudent, idSorter); //students is an arrayList of Students
           Collections.sort(graduateStudent, idSorter); //students is an arrayList of Students
          
          
           PrintWriter outputFile = new PrintWriter("GraduateStudent.txt");
           for(GradStudent tmp : graduateStudent) {
               outputFile.write(tmp.getName()+" "+tmp.getID()+" "+tmp.getMarks()+" "+tmp.getStatus()+" "+tmp.getClg()+"\n");
           }
           outputFile.close();
           System.out.println("Data exported successfully for GraduateStudent!!!");
          
           PrintWriter outputFile2 = new PrintWriter("UnderGraduateStudent.txt");
           for(UndergradStudent tmp : undergraduateStudent) {
               System.out.println(tmp);
               outputFile2.write(tmp.getName()+" "+tmp.getID()+" "+tmp.getMarks()+" "+tmp.getStatus()+" "+tmp.getIsUnderGraduate()+"\n");
           }
           outputFile2.close();
           System.out.println("Data exported successfully for UnderGraduateStudent!!!");
          
          
       } catch (FileNotFoundException e) {
           System.out.println("file not found");
       }
   }

}

output

student.txt

James Bond,200304,3.2,undergraduate,true
Michelle Chang,200224,3.3,graduate,Cleveland State University
Tayer Smoke,249843,2.4,undergraduate,false
David Jones,265334,2.7,undergraduate,true
Abby Wasch,294830,3.6,graduate,West Virginia
Nancy Drew,244833,2.9,graduate,Case Western
Lady Gaga,230940,3.1,undergraduate,false
Sam Jackson,215443,3.9,graduate,Ohio State University

GraduateStudent.txt

Michelle Chang 200224 3.3 graduate Cleveland State University
Sam Jackson 215443 3.9 graduate Ohio State University
Nancy Drew 244833 2.9 graduate Case Western
Abby Wasch 294830 3.6 graduate West Virginia

UnderGraduateStudent.txt

James Bond 200304 3.2 undergraduate true
Lady Gaga 230940 3.1 undergraduate false
Tayer Smoke 249843 2.4 undergraduate false
David Jones 265334 2.7 undergraduate true