Class attributes

Question

Why does the code is returning to me 0 or Null values???
import java.util.Scanner;

public class Main {

public static void main(String[] args) {
Scanner read = new Scanner(System.in);
String firstName = read.nextLine();
String secondName = read.nextLine();
int age = read.nextInt();
int roomNumber = read.nextInt();
Customer customer = new Customer();
//set customer's data to object here

customer.saveCustomerInfo();
}
}

class Customer {
//add all necessary attributes here
String firstName;
String secondName;
int age;
int roomNumber;

public void saveCustomerInfo() {
System.out.println("First name: " + firstName);
System.out.println("Second name: " + secondName);
System.out.println("Age: " + age);
System.out.println("Room number: " + roomNumber);
}
}

Answer 1

[Page 2]
// continue...
class Customer {
//add all necessary attributes here
String firstName;
String secondName;
int age;
int roomNumber;

// constructor
Customer(String fn, String sn, int a, int rn){
this.firstName = fn;
this.secondName = sn;
this.age = a;
this.roomNumber = rn;
}

public void saveCustomerInfo() {
System.out.println("First name: " + firstName);
System.out.println("Second name: " + secondName);
System.out.println("Age: " + age);
System.out.println("Room number: " + roomNumber);
}
}

Answer 2

[Page 1]
Your class attributes is not getting values.
One way is by creating a constructor.
This will help you assign values to your class attributes during object creation.

INPUT:
John
Doe
30
123

[CODE]
import java.util.Scanner;

public class Main {

public static void main(String[] args) {
Scanner read = new Scanner(System.in);
String firstName = read.nextLine();
String secondName = read.nextLine();
int age = read.nextInt();
int roomNumber = read.nextInt();
Customer customer = new Customer(firstName, secondName, age, roomNumber);
//set customer's data to object here

customer.saveCustomerInfo();
}
}

Answer 3

import java.util.Scanner;

public class Main {

public static void main(String[] args) {
Scanner read = new Scanner(System.in);
String firstName = read.nextLine();
String secondName = read.nextLine();
int age = read.nextInt();
int roomNumber = read.nextInt();
Customer customer = new Customer();
//set customer's data to object here
customer.setFirstName(firstName);
customer.setSecondName(secondName);
customer.setAge(age);
customer.setRoomNumber(roomNumber);

customer.saveCustomerInfo();
}
}

class Customer {
//add all necessary attributes here

String firstName;
String secondName;
int age;
int roomNumber;

public void setFirstName (String firstName){
this.firstName = firstName;
}

public void setSecondName (String secondName){
this.secondName = secondName;
}

public void setAge (int age){
this.age = age;
}

public void setRoomNumber (int roomNumber) {
this.roomNumber = roomNumber;
}

public void saveCustomerInfo() {
System.out.println("First name: " + firstName);
System.out.println("Second name: " + secondName);
System.out.println("Age: " + age);
System.out.println("Room number: " + roomNumber);
}
}

Answer 4

i ve tried several times but it doesn't work. Basically, how to assign the object attribute to the input??