import java.io.*;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
 
public class TextFile
{
	public static BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
	public static String[] person;
	public static String[] tempPerson;
	public static String[] sepTemp;
	public static int xCtr;
 
	public static void mainMenu()
	{
		System.out.println("1] Insert");
		System.out.println("2] Delete"); ////////////////
		System.out.println("3] Exit");///////////////
	}
public static void insertData() throws IOException ///insert
	{
		System.out.print("Enter name: ");
		String pName = stdin.readLine();
		String temp;
 
		if (xCtr != 0)
		{
 
			temp =tempPerson[0] + ", " + pName;	
 
		}
		else
		{
			temp = pName;
			xCtr = 1;
		}	
 
		FileOutputStream x = new FileOutputStream("myTextFile.dat");
		ObjectOutputStream y = new ObjectOutputStream(x);
		y.writeObject(new String[] {temp});
 
		System.out.println("New Entry Updated...");
 
		y.close();
	}
 
	public static void displayInitData() //displayInitial data
	{
		try
		{
 
				FileInputStream x = new FileInputStream("myTextFile.dat");
				ObjectInputStream y = new ObjectInputStream(x);
				tempPerson = (String[])(y.readObject());
 
				sepTemp = new String[100000];
				sepTemp = tempPerson[0].split(", ");
 
 
				int i = 0;
 
				do 
				{
					person[i] = sepTemp[i];
					i = i + 1;
				}
				while(i<sepTemp.length);
 
 
				xCtr = i;
 
 
		}
		catch(Exception m)
		{
			m.getMessage();
		}
 
	}
 
	public static void displayData() 		//display data
	{
		int i=0;
 
		do 
		{
			System.out.println(sepTemp[i]);
			i = i + 1;
		}
		while(i<sepTemp.length);		
	}
public static void main (String[] args) throws IOException, Exception
	{
		int choiceMenu;
 
		person = new String[100000];
		tempPerson = new String[100000];
		displayInitData();
 
		do
		{
			mainMenu();
			System.out.print("Enter Choice: ");
			choiceMenu = Integer.parseInt(stdin.readLine());
 
			switch(choiceMenu)
			{
				case 1:	displayInitData();
						insertData();
						break;
				case 2:delete();
						break;
								case 3:
						if (xCtr > 0)
						{
							displayInitData();
							displayData();
						}
						else
							System.out.println("No Record");
						break;
				default:
			}
		}
		while(choiceMenu!=3);
 
    }
}