Cannot resolve symbol in Java. I want to run the code of second class in the first class

I am learning Java from tutorials, and recently I faced with one problem. I need to create several classes, and I need to read all that classes through first class. Already I passed that tutorial where I understood everything and tried that thing. But now I want to create a real world app on Java, I did the exact thing which was showing in tutorial, but I am getting that error. Please, correct me where I have mistaken

Code of first class:

package com.company;

public class Email {


    private String firstName;
    private String lastName;
    private String password;
    private String department;
    private String alternateEmail;
    private int capacityMailbox;

    // Constructor to recieve the first name and last name
    public Email(String firstName, String lastName){
        this.firstName = firstName;
        this.lastName = lastName;
        System.out.println(em);
    }// Ask for the department

    // Generate a random password

    // Set the mailbox capacity

    // Set the alternate email

    // Change the password


}

Second one:

package com.company;

public class EmailApp {

    public static void main(String[] args) {
	// write your code here
        Email em = new Email("John", "Smith");
    }
}

Screenshotes:

Thanks

You can use System.out.println(this) in constructor. It means that you will print created instance to console. And also don't forget to override toString() method - because if you don't override it, you will get object's name with hashcode.

Hope this code will help you to reach the goal:

public class Email {
    private String firstName;
    private String lastName;
    private String password;
    private String department;
    private String alternateEmail;
    private int capacityMailbox;

    // Constructor to recieve the first name and last name
    public Email(String firstName, String lastName){
        this.firstName = firstName;
        this.lastName = lastName;
        System.out.println(this);
    }
    // Ask for the department
    // Generate a random password
    // Set the mailbox capacity
    // Set the alternate email
    // Change the password

    @Override
    public String toString() {
        return "Email{" +
                "firstName='" + firstName + '\'' +
                ", lastName='" + lastName + '\'' +
                '}';
    }
}

Another solution. Just override toString of Email class. And put printing of em to main method.

public class Email {
    private String firstName;
    private String lastName;
    private String password;
    private String department;
    private String alternateEmail;
    private int capacityMailbox;

    // Constructor to recieve the first name and last name
    public Email(String firstName, String lastName){
        this.firstName = firstName;
        this.lastName = lastName;
    }
    // Ask for the department
    // Generate a random password
    // Set the mailbox capacity
    // Set the alternate email
    // Change the password

    @Override
    public String toString() {
        return "Email{" +
                "firstName='" + firstName + '\'' +
                ", lastName='" + lastName + '\'' +
                '}';
    }
}

Main class:

public class EmailApp {
    public static void main(String[] args) {
    // write your code here
        Email em = new Email("John", "Smith");
        System.out.println(em);
    }
}

The constructor of your Email Class does not have a variable called em.
You should put System.out.println(em) into the Main method of your EmailApp class.

The object reference "em" has no scope in first class i.e. class Email.

make these following two changes and compare your code. you will understand where you went wrong.

//-----------------------------------------------------change 1
  public Email(String firstName, String lastName){
        this.firstName = firstName;
        this.lastName = lastName;
      
    }

and in second class:

//---------------------------------------------change 2
public class EmailApp {

    public static void main(String[] args) {
    // write your code here
        Email em = new Email("John", "Smith");
        System.out.println(em.firstname);
        System.out.println(em.lastname);
    }

}

and make all member variables public for now. You will make it private when you understand "getters and setters" concept.