File in java

package taoshiflex.practice;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Random;
import java.util.Scanner;
import java.util.Set;

public class Practice {
    public static void main(String[] args) {
        
        // Input: Number of students
        try (Scanner in = new Scanner(System.in)) {
            // Input: Number of students
            System.out.print("Enter the number of students: ");
            int n = in.nextInt();
            in.nextLine(); // Consume the leftover newline
            
            // File paths
            String directoryPath = "E:\\University";
            String filePath = directoryPath + "\\Student.txt";
        
            // ArrayList to store student details
            ArrayList<String> studentDataList = new ArrayList<>();
            
            try {
                // Create directory
                File directory = new File(directoryPath);
                if (!directory.exists()) {
                    directory.mkdir();
                    System.out.println("Directory created: " + directoryPath);
                }
            
                // Generate student data
                Random random = new Random();
                Set<String> uniqueIDs = new HashSet<>();
                
                for (int i = 1; i <= n; i++) {
                    String firstName = "FirstName" + i;
                    String lastName = "LastName" + i;
                    int yearOfAdmission = random.nextInt(2024 - 2012 + 1) + 2012;
                    
                    String id;
                    do {
                        int randomPart = 1000 + random.nextInt(9000); // Random 4-digit number
                        id = yearOfAdmission + String.valueOf(randomPart);
                    } while (uniqueIDs.contains(id)); // Ensure ID uniqueness
                    
                    uniqueIDs.add(id);
                    
                    // Add student details to the list
                    String studentData = firstName + " " + lastName + " " + yearOfAdmission + " " + id;
                    studentDataList.add(studentData);
                }
                
                try ( // Write to file using BufferedWriter
                        BufferedWriter writer = new BufferedWriter(new FileWriter(filePath))) {
                    for (String studentData : studentDataList) {
                        writer.write(studentData);
                        writer.newLine();
                    }
                }
                
                System.out.println("Student data written successfully to " + filePath);
                
                // Read from file using BufferedReader
                System.out.println("\nReading data from file:");
                try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
                    String line;
                    while ((line = reader.readLine()) != null) {
                        System.out.println(line);
                    }
                }
                
            } catch (IOException e) {
                System.out.println("An error occurred: " + e.getMessage());
            }
        }
    }
}