Question

A College wants to build their Student Information Systems (SIS). Whenever a new Student is added to the college, the details need to be recorded in a text file. Student information officer should be able to use the SIS to retrieve information from the text file and display it on the screen. The system also needs to be able to format or parse strings retrieved from the text file. I am using Eclipse IDE to write java code. Can I have help to develop the necessary design and implement the solution for the above given scenario. The solution must be able to serialize and/or de-serialize objects using the appropriate java APIs. You must document the Analysis and Design phases and submit the document with the artefact..

I

Please can I have Java code to implement this.

Answer 1

Hi,

Java code to implement the above-mentioned scenario.

and attaching a sample screenshot of output.

CODE:

package serialization;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class StudentInformationSystems {

   public static void main(String[] args) {
      
       // instantiates student with param constructor
       Student s = new Student("John", 1001);
       Student s1 = new Student("Martin", 1002);
       //creates list which stores student objects
       List<Student> list = new ArrayList<>();
       list.add(s);
       list.add(s1);
      
       //invoking write File method to write into a file
       writeFile(list);
      
       //invoke read file method to read from a file
       readFile();

   }

   //using serialization to write objects into file
   public static void writeFile(List<Student> studentList) {
       // using try with resources for closing resources implicitly after program
       // execution
       // creates the object of FileOutStream and specify the path where you want to store student details
       // creates the object of ObjectOutputStream
       try (FileOutputStream fos = new FileOutputStream("C:\studentData\student.txt");
               ObjectOutputStream oos = new ObjectOutputStream(fos)) {
           // Writes an object to a file
           oos.writeObject(studentList);
           System.out.println("student Object written to file successfully");

       } catch (IOException e) {
           e.printStackTrace();
       }
   }

   //method for deserialization to read objects from a file
   public static void readFile() {

       //creates list which stores Student Objects
       List<Student> studentList = new ArrayList<Student>();
      
       /*creates an instance of FileInputStream and give the path as argument
       from where you want to read data*/
       //creates the instance of ObjectInputStream
       try (FileInputStream fis = new FileInputStream("C:\studentData\student.txt");
           ObjectInputStream ois = new ObjectInputStream(fis)
       ) {
          
           //reads all objects from file and stores in a list
           studentList = (List<Student>) ois.readObject();
          
           //traversing through list to access student details
           for(Student s : studentList) {
               System.out.println(s);
           }
          
           System.out.println("data read successfully");
          
       } catch (IOException ioe) {
           ioe.printStackTrace();
           System.err.println("ERROR: " + ioe.getMessage());
       } catch (ClassNotFoundException cnfe) {
           System.err.println("ERROR: " + cnfe.getMessage());
       }

   }

}

//class which need to be serialized must implement Serializable interface
class Student implements Serializable {

   /*serialVersionUID will be used to verify that the sender and receiver of a serialized
   object have loaded classes for that object that are
   compatible with respect to serialization*/
   private static final long serialVersionUID = 1L;
  
   //add more attriutes according to scenario and change parameterized constructor accordingly
   private String studentName;
   private int studentId;

   public Student(String studentName, int studentId) {
       this.studentName = studentName;
       this.studentId = studentId;
   }
  
   public static long getSerialversionuid() {
       return serialVersionUID;
   }

   public String getStudentName() {
       return studentName;
   }

   public int getStudentId() {
       return studentId;
   }

   @Override
   public String toString() {
       // TODO Auto-generated method stub
       return studentName+" "+studentId;
   }

}