How to add a search/edit/delete options for the following program.

Question

after printing the out put, i want to search for the line and i want to edit the same line then add to the output and also i want to delete the line from the command line
import java.io.BufferedReader;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
public class CustomerDetails {
public static void main(String[] args) throws IOException {
BufferedReader dataIn= new BufferedReader(new InputStreamReader(System.in));
FileWriter writer;
String name= "";
String DOB = "";
String Address = "";
String Phonenumber = " ";
File filename = new File("customerData.txt");
boolean append = true;
writer = new FileWriter(filename,append);
writer.write("\n");
try {
System.out.println("Please enter your name");
name = dataIn.readLine();
System.out.println("please enter ut DOB");
DOB = dataIn.readLine();
System.out.println("please enter ur Address");
Address = dataIn.readLine();
System.out.println("please enter ur phone number");
Phonenumber = dataIn.readLine();
writer.write("name:");
writer.write(name);
writer.write("DOB:");
writer.write(DOB);
writer.write("Address:");
writer.write(Address);
writer.write("Phone number:");
writer.write(Phonenumber);
writer.close();
catch (IOException e) {
e.printStackTrace();
System.out.println("thanks for entering  the data");
}

Answer 1

Well, what I'm suggesting isn't as simple as editing a few lines.
Are you familiar with using objects?
The idea is to organize your data in a way that makes sense. Since you want to keep track of multiple people at once, does it make sense to only have one variable each for name, address, etc? If you put all of the variables dealing with a person into a Person object, you can then instantiate as many people as you'd like- without worrying about keeping track of them one variable at a time.
I'd say that should be your first step. After that, we can talk about searching through them.