// Classes to do Text-based file Input/Output and simple parsing

import java.io.*;

class Student
{
  String name, ssn;
  int age;
  Student (String n, String s, int a)
  {
    name = new String(n);
    ssn = new String(s);
    age = a;
  }
  void display ()
  {
    System.out.println("SSN: " + ssn + "; Name: " + name + 
		       " ; Age: " + age);
  }
}

class StudentDB
{
  Student db[];
  int num_students = 0;
  int maxsize;
  StudentDB (int size) { maxsize = size; db = new Student[size]; }
  void add_student (Student x)
  {
    if (num_students == maxsize)
      {
	System.out.println("Database Full");
	return;
      }
    db[num_students] = x;
    num_students++;
  }
  void show_all ()
  {
    System.out.println("Report of students in list: ");
    for (int i=0; i < num_students; i++)
      db[i].display();
  }
  void store_data (String output_file) throws IOException
  {
    // 2nd parameter to the constructor
    PrintWriter dout = new PrintWriter(new BufferedWriter
				       (new FileWriter(output_file)), true);
    for (int i=0; i < num_students; i++)
      dout.println(db[i].ssn + " " + db[i].name + " " + db[i].age);
  }
}

class simple
{

  public static void main (String args[]) throws IOException
  {
    StudentDB database = new StudentDB(25);

    String name, ssn, line, remaining;
    int age, pos, ssn_start, age_start;
    String input_file, output_file;
    
    BufferedReader din = new BufferedReader(new InputStreamReader(System.in));
    System.out.print("Enter input file name: ");
    input_file = din.readLine();
    System.out.print("Enter output file name: ");
    output_file = din.readLine();

      
    din = new BufferedReader(new FileReader(input_file));

    // read the data and create the data structures
    while (true)
      {
	line = din.readLine();
	if (line == null) break;
	// parse the input line
	remaining = line.trim();
	pos = remaining.indexOf(" ");
	name = remaining.substring(0, pos);
	remaining = remaining.substring(pos+1).trim();
	pos = remaining.indexOf(" ");
	ssn = remaining.substring(0, pos);
	remaining = remaining.substring(pos+1).trim();
	age = Integer.parseInt(remaining);

	Student foo = new Student(ssn, name, age);
	database.add_student(foo);
      }
    database.show_all();
    database.store_data(output_file);

  }
}