Question

I need the following written in Java please, thank you

We want you to implement a java class that will show details on users and throw exceptions where needed. The following requirements specify what fields you are expected to implement in your User class: - A private String firstName that specifies the first name of the user - A private String lastName that specifies the last name of the user - A private int age that specifies user's age
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Answer 1

Thanks for the question, here is the code you will be needing, Both User.java and the main methods() has been implemented.

Let me know for any questions or help, no need to post the same question again, just comment your query and i will revert back ASAP.

thank you

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public class User {

    private String firstName;
    private String lastName;
    private int age;
    private String userID;
    private String phoneNum;

    public User() {
        firstName = "";
        lastName = "";
        age = 21;
        userID = "";
        phoneNum = "";
    }

    public User(String firstName, String lastName, int age, String userID, String phoneNum) {

        if (age < 0 || age > 99) throw new IllegalArgumentException("Error: Invalid age provided.");
        if (phoneNum.trim().length() > 10)
            throw new IllegalArgumentException("Error: Phone number length is greater than 10");
        isValidUserID(userID);
        this.firstName = firstName;
        this.lastName = lastName;
        this.age = age;
        this.userID = userID;
        this.phoneNum = phoneNum;
    }

    public User(String firstName, String lastName, String userID, String phoneNum) {

        if (phoneNum.trim().length() > 10)
            throw new IllegalArgumentException("Error: Phone number length is greater than 10");
        isValidUserID(userID);
        this.firstName = firstName;
        this.lastName = lastName;
        this.age = 21;
        this.userID = userID;
        this.phoneNum = phoneNum;
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public int getAge() {
        return age;
    }

    public String getUserID() {
        return userID;
    }

    public String getPhoneNum() {
        return phoneNum;
    }

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

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public void setAge(int age) {
        if (age < 0 || age > 99) throw new IllegalArgumentException("Error: Invalid age provided.");
        this.age = age;
    }

    public void setUserID(String userID) {
        isValidUserID(userID);
        this.userID = userID;
    }

    public void setPhoneNum(String phoneNum) {
        if (phoneNum.trim().length() > 10)
            throw new IllegalArgumentException("Error: Phone number length is greater than 10");
        this.phoneNum = phoneNum;
    }

    private boolean isValidUserID(String userID) {
        if (userID.trim().length() < 8)
            throw new IllegalArgumentException("Error: User ID is not having minimum 8 characters.");

        for (int i = 0; i < userID.length(); i++) {
            if (Character.isDigit(userID.charAt(i))) {
                return true;
            }
        }
        throw new IllegalArgumentException("Error: User ID does not contains any number.");

    }

    private String deconstructPhone() {

        return "Area Code: " + phoneNum.substring(0, 3) + "\nPhone Number: " + phoneNum.substring(3);
    }

    public void display() {
        System.out.println("Name: " + getFirstName() + " " + getLastName());
        System.out.println("Age: " + getAge());
        System.out.println("UserID: " + getUserID());
        System.out.println("Phone Number: " + getPhoneNum());
        System.out.println(deconstructPhone());
    }


    public static void main(String[] args) {

        User user1 = new User();
        user1.setFirstName("Sarah");
        user1.setLastName("Holt");
        user1.setUserID("sarahholt26!");
        user1.setPhoneNum("9548926728");

        user1.display();


        User user2 = new User("Kevin", "James", 25, "kjames2552", "8019023100");
        user2.display();

        try {

            User user3 = new User("Dante", "Counto", "dantetezza", "95000");
            user3.display();
        }catch (IllegalArgumentException e){
            System.out.println(e.getMessage());
        }
    }
}

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