How to get number from file that is written

I am making an java program for college and I am stuck at one point, the exam says I need to extract information from an txt file that is already written. I need to get only the information from the end of the lines like password or something.

DISCLAIMER:

I know how to do it by using scanner and file. But it is not really clear how to extract only the information not the whole line.

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Random;
public class Trip {
private String password;
private String placeOfDeparture;
private String destination;
private int durationInDays;
private double wage;
private double rentPrice;
private String firstName;
private String lastName;
private String[] passwords;
public Trip(String placeOfDeparture, String destination, int durationInDays, double wage,
double rentPrice, String firstName, String lastName) {
super();
this.placeOfDeparture = placeOfDeparture;
this.destination = destination;
this.durationInDays = durationInDays;
this.wage = wage;
this.rentPrice = rentPrice;
this.firstName = firstName;
this.lastName = lastName;
generateTripPassword();
}
public void generateTripPassword() {
Random rand = new Random();
int randomNumbers = rand.nextInt(100);
String personInitials = "";
String departureInitials = "";
String destinationInitials = "";
personInitials += firstName.substring(0, 1).toUpperCase();
personInitials += lastName.substring(0, 1).toUpperCase();
departureInitials += placeOfDeparture.substring(0, 2).toUpperCase();
destinationInitials += destination.substring(0, 2).toUpperCase();
for(int i = 0; i < passwords.length; i++) {
if(passwords[i] == null) {
passwords[i] = personInitials + departureInitials + destinationInitials + randomNumbers;
break;
}
}
this.password = personInitials + departureInitials + destinationInitials + randomNumbers;
}
public void getTripInformation() {
System.out.println("Trip details: \n");
System.out.println("Trip password: " + password);
System.out.println("Passenger name: " + firstName + " " + lastName + ".");
System.out.println("Duration in days: " + durationInDays + ".");
System.out.println("Wage: " + wage + ".");
System.out.println("Rent price is: " + rentPrice + ".");
}
public void writeTripInfo(String tripType) {
File file = new File(this.password + ".txt");
try {
FileWriter trip = new FileWriter(file);
trip.write("Trip details: ");
trip.write("Trip password: " + password);
trip.write("Passenger name: " + firstName + " " + lastName + ".");
trip.write("Duration in days: " + durationInDays + ".");
trip.write("Wage: " + wage + ".");
trip.write("Rent price is: " + rentPrice + ".");
trip.write("Type of the trip is: " + tripType);
trip.close();
System.out.println("File writing successfully completed! Name of yje file is: " + this.password + " . Enjoy.");
} catch (IOException e) {
System.out.println("An error occured while writing file.");
System.out.println("Here is the error debug code: ");
e.printStackTrace();
}
}
}

After you have put each part on its own line (and removed the '.' at the end), you can parse each line by splitting on ':'

public void readTripInfo(String path)
{
try (BufferedReader br = new BufferedReader(new FileReader(path))) {
String line;
// Read each line of file
while ((line = br.readLine()) != null) {
// Split on ':'
String [] parts = line.split(":");
if (parts.length == 2) {
// Save
if (parts[0].equals("Trip password")) {
password = parts[1].trim();
}
else if (parts[0].equals("Passenger name")) {
String [] names = parts[1].trim().split(" ");
if (names.length == 2) {
firstName = names[0];
lastName = names[1];
}
}
else if (parts[0].equals("Duration in days")) {
durationInDays = Integer.parseInt(parts[1].trim());
}
// Continue for the rest
}
}
}
catch (Exception e) {
System.out.println(e);
}
}