第十二周

本周任务如下：

1. 注册OnlineGDB并且加入课程群：https://onlinegdb.com/classroom/invite/Fd0aduv55

2. 完成Person Class作业

Person Class

An instance variable can be assigned an initial value in its declaration, just like any other variable. For example, consider a class named Person. An object of this class will represent a person. It will contain three instance variables to represent its name, email and phone number:

Person.java

public class Person
{
    // instance variables
    private String name;
    private String email;
    private String phoneNumber;

    // constructor: construct a Person copying in the data into the instance
    // variables
    public Person(String initName, String initEmail, String initPhone)
    {
        name = initName;
        email = initEmail;
        phoneNumber = initPhone;
    }

    // Print all the data for a person
    public void print()
    {
        System.out.println("Name: " + name);
        System.out.println("Email: " + email);
        System.out.println("Phone Number: " + phoneNumber);
    }
    
    //To be implement in Exercise 1
    public boolean isValidEmail() {
        return false;
    }
}

Exercise1: Validate person's email

The '@' symbol is a crucial component of the syntax for email addresses. According to the standard format,

email address consists of two main parts: a local part and a domain part. These two parts are separated by the '@' symbol. For example, in the email address "[e-mail]", "example" is the local part, and "example.com" is the domain part.

Your task is to add a method isValidEmail() to this class that checks if the person's email contains the '@' . This method should return true if the email contains '@', and false otherwise.

The method signature should be:

public boolean isValidEmail()

Exercise 2: Test your Person Class.

Create a driver class. Paste the code here. Create the following two Person Objects in the driver class.

public class Main {
    public static void main(String[] args)
    {
        // call the constructor to create a new person
        Person p1 = new Person("Sana", "[e-mail]", "123-456-7890");
        // call p1's print method
        p1.print();
        
        Person p2 = new Person("Jean", "[e-mail]", "404 899-9955");
        p2.print();
        
        Person p3 = new Person("X", "xyz", "xxx");
        
        System.out.println(p1.isValidEmail());
        System.out.println(p3.isValidEmail());
    }
}

Click test, then you can see the result.

When you are ready, submit your code.