Question

In java

Objectives:

In this lab, the following topics will be covered:

1. Text Files

2. Binary Files

Exercise 1 Create an array of Course objects taken from the user. The class Course has the following attributes: code like "ICS201", name like "Introduction to Computing II", and credit hours like 4. Save the array to both a text file, and a binary file.

Exercise 2 Write a program that reads the text file created in Exercise 1 into an array of Course objects then it displays it to the screen.

Exercise 3 Write a program that reads the binary file Exercise 1 into an array of Course objects then it displays it to the screen.

I posted in a previous question and I haven't got the answer yet and I need it in 4 hours plzZ

Answer 1

/*******************************Course.java****************************/

import java.io.Serializable;

public class Course implements Serializable {

  
   private static final long serialVersionUID = 1L;
   private String code;
   private String name;

   public Course(String code, String name) {
       this.code = code;
       this.name = name;
   }

   public String getCode() {
       return code;
   }

   public String getName() {
       return name;
   }

   @Override
   public String toString() {
       return "Course [code=" + code + ", name=" + name + "]";
   }

}
/*******************************ReadFile.java*************************/

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Scanner;

public class ReadFiles {

   public static void main(String[] args) {

       Course c1 = new Course("CSE303", "Into to c Programming");
       Course c2 = new Course("CSE501", "Networking with TCP/IP");

       Course[] courses = new Course[10];
       int index = 0;
       try {
           Scanner scan = new Scanner(new File("courses.txt"));
           while (scan.hasNextLine()) {

               String line = scan.nextLine();

               String code = line.split(",")[0];
               String name = line.split(",")[1];

               courses[index] = new Course(code, name);
               index++;
           }
           scan.close();
       } catch (FileNotFoundException e) {
           System.out.println("File not found");
       }

       try {
           FileOutputStream f = new FileOutputStream(new File("courses.dat"));
           ObjectOutputStream o = new ObjectOutputStream(f);

           // Write objects to file
           o.writeObject(c1);
           o.writeObject(c2);

           o.close();
           f.close();

           FileInputStream fi = new FileInputStream(new File("courses.dat"));
           ObjectInputStream oi = new ObjectInputStream(fi);

           courses[index] = (Course) oi.readObject();
           courses[index + 1] = (Course) oi.readObject();

           oi.close();
           fi.close();

       } catch (FileNotFoundException e) {
           System.out.println("File not found");
       } catch (IOException e) {
           System.out.println("Error initializing stream");
       } catch (ClassNotFoundException e) {
           e.printStackTrace();
       }

       int i = 0;
       while (courses[i] != null) {

           System.out.println(courses[i].toString());
           i++;
       }
   }
}
/********************************courses.txt*********************/

ICS201,Introduction to Computing
CSE102,Introduction to Java
CSE203,C Programming

/*******************courses.dat*********************/

/*******************output*****************/

Course [code=ICS201, name=Introduction to Computing]
Course [code=CSE102, name=Introduction to Java]
Course [code=CSE203, name=C Programming]
Course [code=CSE303, name=Into to c Programming]
Course [code=CSE501, name=Networking with TCP/IP]

Please let me know if you have any doubt or modify the answer, Thanks:)