Question

Write this in Java.

say i have a file called "file.txt" that looked like this:

 Dunn        Sean        31111
Duong       Geoffrey    29922
Fazekas     Nicholas    31100
Prezioso    Stefano     22223
Puvvada     Mohana      11224

and i have an object class called Student, with three String fields lastName, firstName, and ID.

i want to read in file.txt from another class (preferably using BufferedReader) and store each line in the file as a Student in a Student array

(example: first line gets stored as ("Dunn" , "Sean" , "31111") in a Student array students as students[0])

Answer 1

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SOLUTION:

I have used two files one for code and one for storing student details

This will read data from file: FIle name "ReadFIle"

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;

public class ReadFile {
   public static void main(String[] args) {
   ArrayList<Student> students =new ArrayList();
   //array list to store data
   try
   {
   File file=new File("C:/Users/vinod/OneDrive/Desktop/file.txt"); //give file path to do operations
   FileReader fr=new FileReader(file); //reads the file
   BufferedReader br=new BufferedReader(fr); //creates a buffering character input stream
   StringBuffer sb=new StringBuffer(); //constructs a string buffer with no characters
   String line;
   while((line=br.readLine())!=null) //read data line by line till end
   {
   String[] details=line.split("\\s+");
   //split the line read based on space if we use " " it will take only one space
   //for that i used regex of \\s+ it will indicate any number of spaces
   Student student=new Student(details[0],details[1], details[2]);
   students.add(student);
  
   }
   fr.close(); //closes the stream and release the resources
   for(int i=0;i<students.size();i++) {//print the array data by using to string method
       System.out.println(students.get(i).toString());
   }
   }
   catch(IOException e)
   {
   e.printStackTrace();
   }
  
   }
}

Student Class :

package fine;

public class Student {
   public String lastName, firstName,ID;

   Student(String lastName,String firstName,String ID){
       this.lastName=lastName;
       this.firstName=firstName;
       this.ID=ID;
   }

   @Override
   public String toString() {
       return "Student [lastName=" + lastName + ", firstName=" + firstName + ", ID=" + ID + "]";
   }

}

CODE IMAGE: "FileRead"

STUDENT FILE:

OUTPUT:

Inout file:

Output: